Showing posts with label Neural Disorders Journal. Show all posts
Showing posts with label Neural Disorders Journal. Show all posts

Friday, February 25, 2022

Lupine Publishers| Schizophrenia, Carbonyl Stress and Carnosine

 Lupine Publishers| Journal of Neurology and Brain Disorders



Abstract

Recent research suggests that schizophrenia is associated with the development of an advanced aging phenotype (carbonyl stress) and erythrocytes from schizophrenics also exhibit symptoms of cellular aging (increased levels of glycated proteins and ubiquitinated proteins), possibly due to excessive glycolysis-induced methylglyoxal (MG) generation. The endogenous dipeptide carnosine (beta-alanyl-L-histidine), which can delay cellular aging, suppress glycolysis and inhibit MG-induced protein glycation, also exerts some beneficial effects towards schizophrenia. Carnosine is present in human erythrocytes and the olfactory bulb (olfactory dysfunction is associated with schizophrenia). It is suggested that enhanced erythrocyte and olfactory carnosine levels may be more therapeutic towards schizophrenia, if carnosine was also administered intra-nasally to avoid serum carnosinase activity.

 

Keywords:Carnosine; glycation; methylglyoxal; erythrocyte; aging; nasal administration

Introduction

 

Schizophrenia and carbonyl stress

Many studies have indicated a relationship between schizophrenia and dysfunctional energy metabolism [1-3] whilst others indicate that carbonyl stress and generation of advanced glycation end-products (AGEs) accompany schizophrenia [4,5]. Furthermore, a recent study suggests that changes in glycolysis and accelerated cellular aging in glial cells contribute to the condition [6]. The glycolytic intermediates glyceraldehyde-3-phosphate and dihydroxyacetone-phosphate are the most likely sources of AGE formation due to their ability to spontaneously decompose into methylglyoxal (MG). MG is well recognized as a major glycating agent and is thought to be responsible for much macromolecular modifications associated with type-2 diabetes and age-related neurodegenerative conditions [7,8]. However, there is no clear evidence whether suppression of MG generation, via decreased glycolytic activity, has any effect on schizophrenia. The suggestion that schizophrenia seems to be associated with accelerated cellular aging [6] is supported by another recent observation reporting that erythrocytes obtained from schizophrenics contain elevated mounts of ubiquitinated proteins [9]. This might arise from either increased generation of targets for ubiquitination (e.g. aberrant polypeptides or denatured misfolded proteins), or decreased de-ubiquitinating activity, or decreased proteasomal proteolytic activity which would normally complete polypeptide destruction. Interestingly, MG and other agents responsible for carbonyl stress, also induce protein cross-linking which not only renders the target protein less susceptible to proteolytic attack but can also result in inhibition of proteasome activity generally [10]. Thus, it is conceivable that excessive glycolysis can provoke an aging phenotype (AGE accumulation and proteostatic dysfunction) via increased MG generation; such a relationship has been demonstrated in mice fed a high glycemic- index diet [11]. Never-the-less it is necessary to show whether glycation compromises proteostatic in erythrocytes from schizophrenics.

 

Erythrocytes and schizophrenia

A number of recent papers have revealed that erythrocytes obtained from patients with neurological problems, such as Alzheimer’s Disease (AD) and Parkinson’s Disease (PD), exhibit symptoms typical of aging cells in general. For example, compromised proteolytic activity and MG detoxification were detected in AD erythrocytes [12] and accumulation of aggregated protein occurs in red cells from PD patients [13]. Furthermore, dysfunctional energy metabolism, especially in relation to glycolysis culminating in carbonyl stress, are now regarded as characteristics of both AD and PD [14,15]. Therefore, it is not surprising that evidence of carbonyl stress is also accompanied by enhanced protein glycation [16] and accumulation of ubiquitinated proteins [9] in erythrocytes (and possibly other cells) obtained from schizophrenic individuals [17]. Moreover, one of the glycated proteins from “schizophrenic” red cells has been identified as a selenium-binding protein (SBP1) [18]; dysfunctional selenium metabolism has long been regarded as an important contributor to schizophrenia [19,20]. Selenium plays an important role in Sulphur metabolism required for synthesis of antioxidant enzymes such as glutathione peroxidase [21]. Thus, one is beginning to understand the relationship between AGE generation, carbonyl and oxidative stress and the apparently disparate biochemical attributes to schizophrenia.

 

Carnosine, carbonyl stress and schizophrenia

That erythrocytes can contain elevated amounts of MG and glycated proteins suggests the possibility that such red cells could become systemic sources of MG and AGEs to the brain and other tissues, following MG-induced eryptosis [22]. Consequently, it is important to consider whether suppression of carbonyl stress, not only in erythrocytes but in astrocytes and glia, could possibly be a therapeutic strategy. The naturally occurring dipeptide carnosine (beta-alanyl-L-histidine) has been shown to suppress glycolysis in cultured cells [23,24], delay replicative senescence [25], stimulate proteolysis of long-lived proteins in late passage cells [26] and inhibit AGE formation [27]. Furthermore, there is one study showing that schizophrenics subjected to dietary supplementation with carnosine exhibited some beneficial effects [28], possibly due to the dipeptide’s pluripotent properties [29]. It is also interesting to note that

a) Olfactory dysfunction is also associated with schizophrenia [30,31] and

b) Carnosine is enriched in the olfactory bulb [32].

Thus, one has to consider whether raising olfactory carnosine levels could also be useful. However, all studies employing dietary carnosine supplementation are subject to the problem of the presence of serum carnosinase activity which would destroy the dipeptide [33]. There is an alternative route however, which is to use an intra-nasal approach. This could involve a nasal spray of a carnosine solution; another approach could involve use of carnosine powder. Indeed “snorting” carnosine could be far more useful than most white powders some people use, be it illegal drugs or “medicinal snuff “of old. In fact, intra-nasal delivery of potential therapeutic agents is currently being explored [34] with respect to neurodegenerative conditions, as proposed many years ago [35].

Carnosine has been detected in human erythrocytes [36] but in lower amounts when obtained from elderly individuals [36]. It is presumed that red cell carnosine is synthesized (from betaalanine and histidine) during erythropoiesis. Consequently, it would be useful to determine whether dietary supplementation with carnosine or beta-alanine raises erythrocyte carnosine levels and whether there are any beneficial effects with respect to the recognized changes in “schizophrenic” erythrocytes. Additionally, it is suggested that any carnosine (dietary or nasally administered) supplementation period should last for at least 120 days to ensure maximal numbers of carnosine-enriched erythrocytes. It has been proposed that excessive and continuous glycolysis in erythrocytes enhances red cell MG levels, and thus also facilitate delivery of erythrocyte MG to the tissues including the brain [22]. Consequently, it will be also important to determine whether such supplementation protocols decrease carbonyl stress and MG levels not only in red cells but the tissues generally including glia [6].

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Friday, December 10, 2021

Lupine Publishers| Objective Structured Examinations as Supplemental Equipment for Amending Emotional Intelligence: A Pilot Survey

 Lupine Publishers| Journal of Neurology and Brain Disorders

Abstract

Background: The scientific study of emotional intelligence (EI) in organizations has gained considerable research activity over recent years because it is being concerned with awareness and management of one’s own feelings and emotions in daily living activities. The objective of the present study was to investigate the relationship between EI of a group of psychiatric residents and their academic achievement to see that whether proper training and evaluation by new educative instruments can recompense any degree of shortage in EI.

Methods: Consistent with a cross-sectional survey design, 31 psychiatric residents had been requested to answer to The Schutte Self Report Emotional Intelligence Test (SSEIT), in June 2014, for examining the situation with respect to objective structured examinations, like mini-Clinical Examination Exercise (mini-CEX), Objective Structured Clinical Examination (OSCE), and chartstimulated recall (CSR) scores, which had been taken in the earlier 6 months. SSEIT score of 90 had been taken as demarcating point for dividing the sample population into two parallel groups, including the first group with SSEIT score lower than 90 and second group with SSEIT score equal to or more than 90.

Results: The response rate was 93.54%. In line with the results, there was no meaningful relationship between the aforesaid first group and second group as regards the relationship between SSEIT’s score and the mean total score of Mini-CEX, OSCE, and CSR, which had been examined in the preceding 6 months.

Conclusion: The current study demonstrates that EI does not seem to be a fixed problem in psychiatric residents, and enough exercise along with improvement of necessary interrogating or clinical skills may improve or compensate for unsatisfactory EI.

Keywords:Emotional Intelligence; Objectives Structural Examinations; Psychiatric Residents

 

Introduction

The scientific study of Emotional Intelligence (EI) in organizations has gained considerable research activity over recent years [1]. Simultaneously researchers have investigated and raised concerns about the appropriate way to measure EI in various studies [2]. Although EI has been the subject of much attention at both popular and academic level, only now are answers provided to some of the fundamental questions posed about the construct [3]. Dulewicz, Higgs and Slaski confirm that in literature there appears to be some debate about what constitutes the domain of EI, about terminology used to describe the construct and about methods used to measure it [4]. One method that has been used widely in research to measure EI is the Schutte Emotional Intelligence Scale (SEIS) [5]. Dulewicz et al. state that EI is not a new concept [4]. Mayer, Salovey and Caruso [6] define the concept of EI as the capacity to reason about emotions, and of emotions to enhance thinking. EI includes the abilities to accurately perceive emotions, to access and generate emotions in order to assist thoughts, to understand emotions and emotional knowledge, and to reflectively regulate emotions in order to promote emotional and intellectual growth [6]. Dulewicz and Higgs [4] define EI as being concerned with being aware of and managing one’s own feelings and emotions; being sensitive to and influencing others; sustaining one’s motivation; and balancing one’s motivation and drive with intuitive, conscientious and ethical behavior. It is apparent that from this theoretical perspective EI refers specifically to the co-operative combination of intelligence and emotion [7]. EI emphasizes the importance of self-awareness and understanding, redressing a perceived imbalance between intellect and emotion in the life of the collective Western mind [7]. Zeidner et al. further state that EI also connects with several cutting-edge areas of psychological science, including the neuroscience of emotion, self-regulation theory, studies of meta-cognition, and the search for human cognitive abilities beyond ‘traditional’ academic intelligence. Given the core proposition that it is a combination of IQ and EI that determines life success, a question arises as to whether or not it is feasible to measure EI [4]. On the other hand, an Objective Structured Clinical Examination (OSCE) is a modern type of examination often used in health sciences (e.g. Midwifery, orthoptics, optometry, medicine, naturopathic medicine, physician assistants/associates, physical therapy, radiography, nursing, pharmacy, dentistry, chiropractic medicine, paramedicine, podiatry, veterinary medicine). It is designed to test clinical skill performance and competence in skills such as communication, clinical examination, medical procedures / prescription, exercise prescription, joint mobilization / manipulation techniques, radiographic positioning, radiographic image evaluation and interpretation of results [8]. Simulation is a new exciting technology incorporated in undergraduate medical curriculum. It is well accepted by educators across the world to improve experiential learning by enhancing the performance of medical professionals [9]. Simulation is defined as imitation of the “real world” setting to model the environment, resources needed, and the people involved [10]. Educators have encountered educational challenges by reforming the curriculum, developing problem-based learning, and promoting research as well as independent learning. Nevertheless, disparity still persists between the preclinical and clinical environment. Preclinical medical students have minimal contact with clinical cases and are apprehensive when they commence their clinical years and internship. Many students feel that they are inefficient in history taking, physical examination, diagnosis, and management. Medical simulation has been adopted to bridge this educational gap and provide an opportunity to learn from errors [11]. The objective of the present study is to investigate the relationship between EI of a group of psychiatric residents and their academic achievement to see that whether proper training and evaluation by new educative instruments can recompense any degree of shortage in EI.

 

Methods

A cross-sectional appraisal scheme was used in the present assessment. Psychiatric residents were informed about the objective and method of the study, voluntary format of contribution, anonymity and privacy of information. The study was accomplished during June 2014. Total existing population of psychiatric residents was selected as the sample for this study (n=31). Among the total 31 psychiatric residents, 29 participants (93.54%) responded to the evaluation. While one of the participants was reluctant to participate in the assessment, another one was absent during the assessment. Two different types of tools were used in the current estimation. The first one was a demographic inquiry form that involved four queries of sex, age, year of training and educational outcomes regarding their objective structured examinations, including Mini-Clinical Examination Exercise (Mini- CEX), Objective Structured Clinical Examination (OSCE), and Chart-Stimulated Recall (CSR) scores. It deserves to be mentioned that Mini-CEX is a method of appraisal that can be used to evaluate the clinical skill of residents and can enhance student learning and develop student professionalism in serving patients [12]. CSR, as well, has been utilized by active specialists in medicine as a reliable and valid instrument to find strengths and weaknesses in medical practice [13]. OSCE, too, is a modern form of scrutiny that is planned to test clinical skills such as clinical examination, communication, medical procedures / prescription, etc. [14]. The second instrument involved the Schutte Self Report Emotional Intelligence Test (SSEIT), which was developed by Schutte et al. [5]. This tool measures trait EI by means of 33 self-referencing items that evaluate EI level of the person. Individuals score the level they agree or disagree with every single announcement on a 5-point measure oscillating between 1 (strongly disagree) and 5 (strongly agree). Three items among the thirty-three ones [15], are inversely scored. According to Schutte et al., while the two-week test-retest reliability co-efficient of SSEIT is around 0.78, the scale has high internal consistency with Cronbach’s alpha (α) ranging from 0.87 to 0.90 (31). SSEIT scale has been used in different studies with a range of samples including adolescents, adults, and secondary school apprentices, and it is easy to apprehend and score [5]. SSEIT score of 90 is usually taken as a cut-off point. While SSEIT score of 90 or higher includes: low average (90-99), high average (100-109), competent (110-119), strength (120-129) and significant strength (130+), SSEIT score of 89 and lower consists of: consider improvement (70-89) and consider development (69 or less), based on Mayer’s guidelines [15].

 

Statistical Analysis

Demographic characteristics were analyzed by comparison of proportions regarding gender and year of study and comparison of means (t-test) regarding age, scholastic evaluative scores and EI. Data analysis was conducted using MedCalc Statistical Software version 15.2. Statistical significance was determined as a P≤0.05.

 

Results

The demographic characteristics of the study participants are described below in Table 1, and there was no significant baseline demographic difference between male and female participants regarding ethnicity, quantity, age and SSEIT score (Table 1). Among 31 psychiatric residents of the University of Social Welfare and Rehabilitation Sciences, 29 participants (93.54%) answered back to the survey and replied to the Schutte Self Report Emotional Intelligence Test in June 2014.One of the residents was reluctant to participate and another one was on leave during the assessment. 17.24% (n=5), 27.58% (n=8), 24.13% (n=7) and 31.03% (n=9) of the participants were 1st year, 2nd year, 3rd year and finally 4th year post graduate trainee, respectively (Table 2). According to the findings and based on ANOVA, there was no significant difference among four groups of participants with respect to the SSEIT scores (Table 3). In the current evaluation, SSEIT score of 90 was taken as a demarcating point. As a result, while SSEIT score of 90 or higher could include: Low average (90-99), High average (100- 109) , Competent (110-119), Strength (120-129) and Significant Strength(130+), SSEIT score of 89 and lower as well could consist Consider Improvement (70-89) and Consider Development (69 or less), based on Mayer’s guidelines (Mayer, et al., 2002, p. 18). On the whole, in the present sample population, 34.48% (n=11) of the participants had SSEIT score of 89 or lesser (first target group, with a SSEIT score of 83.45+/-3.98), and 79.31% (n=18) of the contributors had SSEIT score of 90 or higher (second target group, with a SSEIT score of 101.5+/-9.03) (Table 4). While quantitatively and base on ‘Comparison of Proportions’ there was no significant difference among those two target groups (z = -1.8383, p<0.06, C I 95% = -0.49, 0.01), comparison of means showed a significant difference, with respect to SSEIT score, among them (p<0.000) (Table 4). But as the main objective of the present assessment and based on between-group analysis and comparison of means, while the mean total scores of the 2nd Group ( with SSEIT score = or >90 ) was commonly higher than the first group (with SSEIT score <90 ) in objective structured examinations, including Mini-CEX, OSCE and CSR , no significant difference was evident among those two target groups regarding their performance in those objective educational tools for assessment of trainee’s skills(p<0.10, p<0.09 , p<0.16, respectively) (Table 5). Post-hoc power analysis showed a power equal to 0.36 on behalf of this trial, which turned to power=0.74 in compromised power analysis.

Discussion

Simulation based education is a promising discipline that provides secure and effectual learning platform for students. The clinical sessions can be planned, observed and repeated to facilitate learning [16]. Exposure to simulation for medical students is a valuable tool to enhance knowledge and student self-confidence at a key transition period prior to beginning of internship [16]. Students report difficulty in applying theoretical knowledge and perceive shortcomings in integrating basic science knowledge with clinical practice [17]. Imparting medical knowledge and skills without placing a patient at an increased risk of complications can be attained through simulation sessions for undergraduate medical students who do not have complete autonomy in diagnosis and management of clinical cases [18]. One of the most challenging aspects of teaching residents is identifying tools for assessment for learning. Assessment for learning allows teachers to see where their residents are doing well and where they need further instruction; as well, it allows teachers to target instruction during the assessment to further residents’ understanding [19]. An OSCE, as the prototype of such kind of innovative evaluations, usually comprises a circuit of short (the usual is 5–10 minutes although some use up to 15 minute) stations, in which each candidate is examined on a one-to-one basis with one or two impartial examiner(s) and either real or simulated patients (actors or electronic patient simulators). Each station has a different examiner, as opposed to the traditional method of clinical examinations where a candidate would be assigned to an examiner for the entire examination. Candidates rotate through the stations, completing all the stations on their circuit. In this way, all candidates take the same stations. It is considered to be an improvement over traditional examination methods because the stations can be standardized enabling fairer peer comparison and complex procedures can be assessed without endangering patient’s health. As the name suggests, an OSCE is designed to be objective (all candidates are assessed using exactly the same stations (although if real patients are used, their signs may vary slightly) with the same marking scheme, structured (stations in OSCEs have a very specific task. Where simulated patients are used, detailed scripts are provided to ensure that the information that they give is the same to all candidates, including the emotions that the patient should use during the consultation.

Instructions are carefully written to ensure that the candidate is given a very specific task to complete, and, finally, clinicaloriented (the OSCE is designed to apply clinical and theoretical knowledge. Where theoretical knowledge is required, for example, answering questions from the examiner at the end of the station, then the questions are standardized and the candidate is only asked questions that are on the mark sheet and if the candidate is asked any others then there will be no marks for them) [20,21]. So, competent performance requires not only requisite knowledge and skills but also beliefs of personal efficacy to use both effectively. Anyhow, the relationship between clinical experience and student performance is complex. Well-organized and strategic learning styles appear to influence the benefits of increased clinical exposure. Direct observation of clinical skills is a critical first step in helping trainees to improve their clinical skills [22]. Back to our discussion and according to the findings of the present assessment, while significant difference was palpable between two groups of psychiatric residents regarding emotional intelligence, based on SSEIT score, no significant correlation was evident between that factor and academic performance of participants. Such a result may not be in harmony with the suggestion of Carrothers et al. [23] who had suggested using EI as part of the selection process for medical students and Stratton et al. [24], who stated that Individuals with low levels of EI may lack the ability to relate empathetically with patients as they are unable to recognize feelings, distress, and mood , or belief of McQueen [25] who said that low levels of EI leads to a negative impact on the doctor–patient relationship . In contrast, our finding was more in agreement with Stratton et al. [24] who found only a modest correlation between EI, and students’ clinical skills assessed by standardized patients in an Objective Structured Clinical Examination (OSCE). On the other hand it could not deny the view of Arora et al. [26] who noted that higher EI may play a role in maintaining good physician–patient relationships, improved teamwork and communication skills, better stress management, and superior commitment and leadership, since generally higher scores in the aforesaid objective assessments were observable, as well, in the present assessment and in the group with higher SSEIT score, though non-significantly. On the other hand, non-significant difference between two groups regarding objective assessment tools could be attributed to the preparation of psychiatric residents, from the start, respecting basic principles and techniques of interview, in general, and sympathy, rapport, verbal and non-verbal communication, specially.

Such an inference is in harmony with the standpoint of Stoller et al. [27] who had recommended that a spiral curriculum should be used to develop EI skills of physicians. Also, while Austin et al. [28] found a gender-based difference and significantly higher overall EI and empathy in female medical students, as like as Carrothers et al. [23], in the present assessment as well higher SSEIT score was evident in female residents, but it was not a significant variance. Such discrepancies may necessitate taking into consideration other interconnected factors that may easily be ignored during scientific assessments, as like as culture, which has been declared by Cherniss and Goleman [29] as a factor that can influence both an individual’s response to an event and the subsequent response selection. In this regard, anthropologists also suggest that cultures have conventions and norms that influence the management of emotions in individuals [30]. These cultural values create commonality and predictability among individuals in their interpretation and response to emotional stimuli. Past research has shown that Whites score lower on EI tests than Hispanics and Blacks [30], a finding that is not in congruence with the later educational and social achievements. Therefore, it is important to study EI in different cultures and ethnic populations to gain insights into their emotional processes. One conclusion from this assessment could include that, while enhancement of rapport, sympathy and emotional intelligence skills, according to Stoller et al. [27], can be an auspicious enlightening approach, selection of medical students based on EI is a discriminating dogma. Also, too much stress on significance of EI by medical mentors is not reasonable, since still a notable unpredictability exists regarding the subject. Evidence based medicine cannot be established on uncertain grounds. If psychiatric training can make low EI a trifling phenomenon, so it can happen in other areas of clinical practice as well. Anyhow , while small sample size, constrained number of objective assessment tools, restriction of study to merely psychiatric residents, limitation of study to a short period of assessment, lack of control or comparison group were among the weaknesses of this study, which limit the generalization of its results, it was simply a pilot exploration. Additional investigations in future with larger sample populations and more systematized approach will certainly help to explore in this regard more meticulously.

Conclusion

The current study demonstrates that EI does not seem to be a fixed problem in psychiatric residents, and enough exercise along with improvement of necessary interrogating or clinical skills may improve or compensate for unsatisfactory EI.

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Tuesday, November 23, 2021

Lupine Publishers | Continuous or Intermittent? Which Regimen of Enteral Nutrition is Better for Acute Stroke Patients? a Systematic Review and Meta-Analysis

 Lupine Publishers| Journal of Neurology and Brain Disorders

 

Abstract

Background and purpose: Enteral nutrition via nasogastric tube in acute stroke patients with dysphagia is an important determinant of patient outcomes. It is unclear whether intermittent or continuous feeding is more efficacious. The aim of this review is to examine the current evidence comparing the effectiveness of intermittent versus continuous feeding in stroke patients in terms of nutritional status, gastrointestinal intolerance and other complications.

Methods: A systematic review of randomized controlled studies comparing intermittent with continuous nasogastric feeding in acute stroke patients was conducted in accordance with PRISMA (Preferred Reporting Items for Systematic Reviews and Metaanalyses) guidance using predefined search terms. The search was conducted in MEDLINE and EMBASE up to 1st March 2019. Two independent reviewers assessed study quality using the Joanna Briggs Institute Critical Appraisal Tool. Meta-analyses were conducted, where appropriate, using a random-effects model to pool risk ratio with corresponding 95% CI.

Results: Three studies including a total of 184 patients were identified. All three were medium to low quality. The definition of intermittent enteral nutrition within each study varied considerably in terms of volume, rate and mode of delivery. Achievement of nutritional targets was the same for both feeding patterns in the one study it was reported. Only aspiration pneumonia and diarrhea were measured by all three studies. There was no significant difference in the incidence of aspiration pneumonia (RR 0.91, 95% CI 0.53-1.57, p=0.74, I2=50%) and diarrhea (RR 1.74, 95% CI 0.70-4.30, p=0.23, I2=42%) between the two patterns of feeding. Other outcomes including, vomiting, gastric retention, mortality, pre-albumin and nasogastric tube complications showed no significant differences.

Conclusion: There is very little and low-quality evidence to inform patterns of enteral feeding after stroke. The available evidence shows no significant difference in nutritional achievement and complications between intermittent and continuous nasogastric tube feeding in acute stroke patients.

Keywords: Stroke; Enteral; Nutrition; Nasogastric; Dysphagia

Background

Dysphagia occurs in up to 50% of patients following a stroke [1- 4] and increases the risk of pneumonia almost ten-fold [5]. Strokerelated pneumonia is associated with longer length of hospital stay, worse levels of disability and increased mortality [6-9]. In most dysphagic patients, adaptation of the consistency of diet and fluids is sufficient to ensure that the swallow is safe. However, in a small proportion insertion of a Nasogastric Tube (NGT) is required to ensure safe and adequate nutrition. Despite this, more than twothirds of NGT-fed stroke patients still develop pneumonia [10] Gastric dysmotility is a well-documented phenomenon that occurs in critically ill patients, including acute stroke patients, whereby incomplete gastric emptying results in stasis, heightening the risk of reflux and aspiration of gastric contents [10-13]. NGT bolus feeding was first described by Morrison et al. [14] in 1895 for children with Diphtheria, who received 6-ounce bolus feeds 3 times a day via NGT. However, it wasn’t until 1910s when Morgan et al. [15] and Jones et al. [16] began administering their enteral feeds “drop by drop” rather than as a bolus. Contemporaneously, the regimen most frequently used in most patients requiring enteral feeding is continuous (i.e. low volume pumped feed lasting 16-24 hours without interruption). However, recent attention has been afforded to examining whether a discontinuous feeding strategy - often described as either intermittent or bolus (i.e. high volume of feed administered over a short period multiple times a day) - could reduce patients’ risk of pneumonia and achieve better nutrition and digestive tolerance.

Intermittent feeding reflects normal human feeding patterns more closely than continuous feeding. A period of fasting interrupted by the ingestion of a discrete meal causes gastric distension and subsequent stimulation of gut motility, secretion of digestive enzymes and metabolic responses to nutrient loading [17- 18]. This physiological gastrointestinal response to intermittent feeding has been demonstrated in healthy adults, neonates and intensive care populations [17-20]. While there are good theoretical reasons to assume that intermittent feeding is more physiological, most stroke patients in the UK receive nasogastric feeding continuously, as there are concerns that intermittent feeding may be less well tolerated. Guidance and practice relating to enteral feeding after stroke differs between countries; with the American Heart Association [21] and the Royal College of Physicians [22] not addressing the issue, Australian Guidelines allowing for both options [23] and intermittent feeding described as “traditional” in China [24]. The aim of this systematic review is to determine whether there are differences in the achievement of adequate nutrition, gastrointestinal tolerance, and metabolic stability between intermittent and continuous nasogastric feeding.

Methods

This systematic review and meta-analysis were prepared according to PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines [25].

Criteria for Considering Studies for this Review

The inclusion criteria for this review were:
a. Population: Acute stroke patients aged 18 or more with a nasogastric tube receiving enteral nutrition
b. Intervention: Intermittent enteral nutrition: by bolus, gravity systems or infusion pump several times a day with a rest between feeds
c. Control: Continuous enteral nutrition: with gravity systems or infusion pumps, without interruption for a minimum period of 12 hours/day
d. Outcomes: Nutritional status, aspiration pneumonia, diarrhea, vomiting, gastric distension, gastric retention, hyperglycemia, pre-albumin, mortality, length of stay, and NGT complications
e. Study Design: Randomized controlled trials or pseudo-randomised controlled trials (a study without true randomisation) that compared continuous and intermittent enteral feeding methods.

Search Strategy

A literature search was performed using MEDLINE (1966 – 1st March 2019) and EMBASE (1974– 1st March 2019). Studies were searched for using the terms enteral, nutrition, nasogastric, gastrointestinal, feeding as Medical Subject Heading (MeSH) and free text terms. These were combined with the set operator “AND” with following terms: intermittent, continuous as both MeSH and free text terms. Publications were restricted to those studying adult populations, defined as greater than 18 years old, with a documented diagnosis of stroke according to accepted international criteria [26]. This search strategy is described in Appendix 1. The reference lists of all eligible studies that were identified were also comprehensively searched for studies not identified using the initial search strategy. This search was performed independently by two reviewers.

Selection of studies

Two reviewers (GDP and ET) assessed the studies independently for inclusion using the title and abstract. In cases where relevance could not be determined solely from the abstract, the full text was consulted. Any disagreements were resolved by consensus with a third reviewer (CR).

Data extraction and management

Data extraction was done manually by two reviewers (GDP and ET). Differences were discussed and adjudicated in faceto- face meetings. Foreign language papers were translated, and descriptions of each study were derived. This included authors, year of publication, type of participant, location, study design, sample size, age and gender of participants, exclusion criteria, when feeding was started, monitoring period, nasogastric tube size, type of feed and definitions of each intervention. In addition, data was extracted for definition and results of each outcome from all studies.

Assessment of risk of bias in included studies

Methodological quality of the studies was assessed using the Joanna Briggs Institute Meta-Analysis of Statistics Assessment and Review Instrument (MAStARI) Critical Appraisal tool for experimental studies [27].

Data synthesis

The studies presented in this review all fitted the conceptual definitions of intermittent and continuous enteral nutrition, as outlined in the inclusion criteria. However, there were differences in the volume, rate and temperature of nutrient delivered. In addition, two of the studies did not use true randomisation. Taking into consideration these limitations, a meta-analysis has been carried out with the outcome’s diarrhea and aspiration pneumonia, as these were the outcomes assessed by all studies. Narrative synthesis was used where outcomes did not allow meta-analysis. The meta-analysis was performed using Review Manager (RevMan) Version 5.3. Copenhagen: The Nordic Cochrane Centre, The Cochrane Collaboration, 2014. Data was extracted from all three studies for the outcome’s diarrhea and aspiration pneumonia. We calculated risk ratios (RR) and 95% CIs using the Mantel–Haenszel model. Statistical heterogeneity among trials was assessed by the I2 test, with I2 >50 representing possible substantial heterogeneity. The meta-analysis was performed with a random‐effects model irrespective of the level of heterogeneity as the included trials varied considerably in a number of methodological features.

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Wednesday, March 3, 2021

Lupine Publishers| Cervical Tarlov Cyst Mimicking Spinal Hydatid Disease: Case Report

 Lupine Publishers| Online Journal of Neurology and Brain Disorders

 
 

Abstract

Background: Perineurial (Tarlov) cysts are usually incidental findings during magnetic resonance imaging of the lumbosacral spine. The Cervical localization have been reported to be a rare occurrence. We report such a case where a high cervical perineural cyst was masquerading as a spinal hydatid disease.

Case Presentation: We report a case of symptomatic cervical Tarlov cyst in a 9 years old girl operated on twice for pulmonary and hepatic hydatid cyst. Spinal magnetic resonance imaging (MRI) showed an extradural intraspinal lesion with fluid-equivalent signal extending from C5 to T2. Based on the history, the diagnosis of spinal hydatid disease was suggested. Surgical excision of the cyst resulted in significant improvement in patient symptoms, and histological examination revealed the diagnosis of a Tarlov cyst.

Conclusion: Cervical perineural (Tarlov) cyst can be symptomatic by causing nerve root compression and can be mistaken as a spinal hydatid disease on imaging. Surgical treatment can be curative.

Keywords: Tarlov Cyst; Hydatid Cyst; Diagnosis; Management MRI; Cervical Spine

Abbreviations: TC: Tarlov Cyst; CSF: Cerebrospinal Fluid; MRI: Magnetic Resonance Imaging

Introduction

Tarlov Cyst (TC) is defined as a cystic dilatation between the perineurium and endoneurium of spinal nerve roots, located at level of the spinal ganglion and filled with Cerebrospinal Fluid (CSF) but without communication with the perineurial subarachnoid space [1]. It is most often found in the sacral spine with a prevalence of 4.6% in the general population with about 13% of those being symptomatic [1,2]. The Cervical localization have been reported to be a rare occurrence [3], to our knowledge there are only five published cases of symptomatic cervical Tarlov cyst [4]. MRI of the spine is the gold standard imaging modality for the diagnostics. This is a case report of a symptomatic cervical TC that was masquerading as a spinal hydatid disease. To our knowledge, only five other cases of symptomatic cervical TC have been published [3,4].

Case Presentation

A 9-year-old girl, with medical history of surgery for pulmonary and hepatic hydatid cysts at age of 8, treated with anthelmintic with good outcome. As far as her past medical history is concerned, there were a history of cervical plexus trauma at the age of 6 with monoparesis sequelae of the left arm. She presented with a 4-week history of gradually developing left hemiparesis. On clinical exam, all deep tendon reflexes were normal. Proximal muscle strength of the left leg and the ipsilateral upper extremity was 3/5. Electromyography (EMG) showed abolition of motor and sensory responses of nerves SPE and SPI on the left upper limb. MRI of the cervical spine showed intraspinal cystic lesion of extra-Dural location lateralized to the left, extending from C5 to T2 causing a stenosis of the adjacent foramina, without contrast enhancement of the cyst wall (Figure 1). Based on the imaging and the history of patient, the diagnosis of a spinal hydatid disease was suspected. Neurosurgical indication was agreed, and the patient underwent a C4-T2 laminotomy (Figure 2), intraoperatively, cystic lesions strongly adhered to the dural mater with an appearance that was evoking congenital cysts. At this point, we opened the capsule and a clear CSF-like liquid came out from the cyst, we conducted a careful excision with Dural plasty. The histological examination showed fibrous tissue and the presence of neural elements, which is typical for perineural cysts. Postoperatively, the patient experienced significant improvement in her symptoms, represented by improved left lower-limb strength. A postoperative MRI of the cervical spine was performed after 6 months showed no recurrence of the cyst (Figure 3).

 

Discussion

Tarlov cysts, or perineural cysts, firstly described by I.M. Tarlov in 1938 as an incidental finding during his autopsy studies of the filum terminale [5]. They are pathological fluid collections located between the peri- and endoneurium, i.e. meningeal dilatations of the nerve sheat at the dorsal root ganglion. They are filled with liquor; therefore the signal is isointense to liquor on all MRI sequences [6]. They are often multiple and are mainly located in the sacral region, cervical location is rare. In a systematic study Burdan et al. reported about a prevalence of 1.2% of cervical perineural cysts [7]. They are symptomatic in 13% of cases according to Langdown et al. [1]. The exact physiopathology of perineural cysts remains unclear, and several hypotheses have been proposed. Tarlov suggested that hemosiderin deposition caused blockage of the venous drainage of the perineurium and epineurium after local trauma can lead to the development of these cysts [4]. Other authors discuss a developmental or congenital origin [8]. The onset of symptoms can be sudden or gradual, and are exacerbated by coughing, standing, and change of position [8], those symptoms depend on their location, and range from backache, perineal pain or sciatica to overt cauda equina syndrome [5]. TC is usually diagnosed using diagnostic imaging. X-ray can show bone erosion in the anterior or posterior part of the vertebral foramen [9]. The CT scan may show CSF isodense cystic mass at the foramen [10]. Myelography was used for the positive diagnosis of TC, it allowed the identification of the communication of the cyst with the subarachnoid space, and late filling phenomenon allowing the differential diagnosis with other cystic lesions of meningeal origin, which are not TC [11]. Spinal MRI is currently the method of choice in diagnosis of perineural cysts, it shows a cystic lesion, located near the dorsal root ganglion with a hypointense signal through T1 weighted imaging, a hyperintense signal through T2 weighted imaging, without godalinium enhancement. The differential diagnosis is mainly with other spinal meningeal cysts. The classification of Nabor et al. makes it possible to differentiate three types: Type I: extradural cysts without nerve fiber, type Ia: arachnoid cyst extradural. Type Ib: meningocele sacred. Type II: extradural cysts containing nerve cells (TC). Type III: arachnoid cyst intradural [12]. It is also important to distinguish with neurogenic tumors such as schwannoma, those solid tumors enhance after gadolinium injection, Joshi et al. reported about a central perineural cyst masquerading a tumor, the cyst was located intra spinally and caused compression of the cervical myelon [13] Till date, published treatment options for apparently symptomatic TC include medication, percutaneous procedures, and surgery. However, these methods are associated with various outcomes and complications. Mitra et al described a conservative approach for a symptomatic cervical TC using oral steroids after initial ineffective course of NSAIDs. A six-day-course of oral steroids was given, leading to relief of symptoms, as far as, the upper extremity motor strength was concerned, but with a slight increase in the patient’s sense of pain [14]. Kim et al. performed a more invasive transforaminal epidural steroid injection for a case of symptomatic perineural cyst in the cervical spine [15]. Epidural steroid injection was primarily employed to reduce neural inflammation causing radicular symptoms, but the follow-up MRI revealed a shrunken cyst in this case, which was an unexpected result of the intervention. Jungwon Lee et al. Performed ultrasound-guided cervical elective nerve root block using local anesthetics and steroids without fenestration of the cyst in a case of symptomatic cervical TC which was resistant to medication [16]. Therefore, ultrasound-guided cervical selective nerve root block is a safe and effective procedural option for the treatment of symptomatic cervical perineural cysts. The microsurgical approach usually involves a small laminectomy with cyst fenestration, cyst imbrication, cyst neck ligation, cyst resection, and combinations of the above [8,17,18]. Combining the evidence from 31 case series Laura E. Dowsett et al. found that after surgical treatment, the symptoms attributed to TC either completely or partially relieved in 83% of the cases. Complete resolution was experienced in 32% of cases, 50% had partial resolution, 16% had no improvement or worsening of symptoms and 0.4% had worsening of symptoms after surgery [19]. However, the optimal management of symptomatic TC is still a matter of ongoing debate because of the variety of outcomes and complications for each method. Percutaneous aspiration of a perineural cyst can cause headaches owing to intracranial hypotension [2]. Fibrin glue placement of perineural cysts is associated with several complications including aseptic meningitis and CSF leakage [20, 21]. Surgical excision of these cysts can also result in complications involving neural damage, pseudomeningocele, and intracranial hypotension [19].

 

Conclusion

In conclusion, symptomatic cervical perineural cysts are extremely rare. In the present case, because of the rarity of the lesion, we did not suspect a TC at first, however, it should be kept in mind in front of any intraspinal cystic lesion, and surgical excision may be an effective option for symptomatic cases.

 

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