Translation and cultural adaptation of the Greek integrated palliative care outcome scale (IPOS): challenges in a six-phase process.

AIM: To translate and culturally adapt IPOS to the Greek population. METHODS: A four phases- sequential study, which included verification of conceptual equivalence, double forward- backward translations and conceptual cognitive debriefing. Focus group interviews used 'think aloud' and 'verbal probing' techniques. Interviews were audio-recorded, transcribed verbatim and thematically analyzed using predefined categories. Purposely sampled from two oncology and palliative care units in Athens. RESULTS: The Integrated Palliative Care Outcome Scale was well accepted by both patients and health professionals. Overall comprehension and acceptability of the scale were good. The comprehension and judgement challenges identified in the pre-final version were successfully resolved in the cognitive interviewing phase. Five out of the seventeen translated items of the scale were modified after cognitive debriefing. Comprehension difficulties were identified with specific terms (e.g., energy/feeling depressed) and with some answer options. Severity of symptoms and not their impact was a common difficulty. A judgement challenge was reported in relation to 7-days recall and fluctuation of symptoms. Layout concerns in relation to length of questions were also stated. All questions were considered important and none as inappropriate. CONCLUSION: This study demonstrated face and content validity and acceptability of the Integrated Palliative Care Outcome Scale in the Greek context. Cognitive Interviewing proved valuable in refining concepts within the specific cultural context. CLINICAL IMPLICATIONS: The IPOS outcome measure tool is now being used routinely in a palliative care service in Athens and is currently used to evaluate service outcomes.

Psychometric Properties of the Greek Version of Demoralization Scale-II (DS-II) in Patients with Cancer.

Introduction: The concept of demoralization is used to describe situations of existential distress and self-perceived inability to effectively deal with stressors. The Demoralization Scale-II (DS-II) is a short and modified version of the original DS that measures the level of demoralization in patients. The purpose of this study is to evaluate the psychometric properties of the Greek version of the Greek Demoralisation Scale-II (DS-II GR) in the population of patients with cancer. Methods: The main tool used in this cross-sectional study is the DS-II GR translated and evaluated for its psychometric properties in a sample of 150 Greek patients with cancer. Exploratory factor analysis (EFA), confirmatory factor analysis (CFA), convergent validity, known groups' validity, cut-off points, internal consistency reliability and test-retest reliability were done. Results: According to the CFA, a two-factor model emerged with a different conceptual content and grouping than the original. The correlation coefficients between DS-II GR and Hospital Anxiety and Depression Scale-Greek (HADS-GR) The internal consistency of DS-II GR for factor 1, factor 2, and total score were measured with Cronbach's alpha and calculated to be 0.906, 0.810, and 0.913. Conclusion: The Greek version of the demoralization scale is reliable and valid for assessing demoralization in Greek patients with cancer.

Real time remote symptom monitoring during chemotherapy for cancer: European multicentre randomised controlled trial (eSMART).

OBJECTIVE: To evaluate effects of remote monitoring of adjuvant chemotherapy related side effects via the Advanced Symptom Management System (ASyMS) on symptom burden, quality of life, supportive care needs, anxiety, self-efficacy, and work limitations. DESIGN: Multicentre, repeated measures, parallel group, evaluator masked, stratified randomised controlled trial. SETTING: Twelve cancer centres in Austria, Greece, Norway, Republic of Ireland, and UK. PARTICIPANTS: 829 patients with non-metastatic breast cancer, colorectal cancer, Hodgkin's disease, or non-Hodgkin's lymphoma receiving first line adjuvant chemotherapy or chemotherapy for the first time in five years. INTERVENTION: Patients were randomised to ASyMS (intervention; n=415) or standard care (control; n=414) over six cycles of chemotherapy. MAIN OUTCOME MEASURES: The primary outcome was symptom burden (Memorial Symptom Assessment Scale; MSAS). Secondary outcomes were health related quality of life (Functional Assessment of Cancer Therapy-General; FACT-G), Supportive Care Needs Survey Short-Form (SCNS-SF34), State-Trait Anxiety Inventory-Revised (STAI-R), Communication and Attitudinal Self-Efficacy scale for cancer (CASE-Cancer), and work limitations questionnaire (WLQ). RESULTS: For the intervention group, symptom burden remained at pre-chemotherapy treatment levels, whereas controls reported an increase from cycle 1 onwards (least squares absolute mean difference -0.15, 95% confidence interval -0.19 to -0.12; P<0.001; Cohen's D effect size=0.5). Analysis of MSAS sub-domains indicated significant reductions in favour of ASyMS for global distress index (-0.21, -0.27 to -0.16; P<0.001), psychological symptoms (-0.16, -0.23 to -0.10; P<0.001), and physical symptoms (-0.21, -0.26 to -0.17; P<0.001). FACT-G scores were higher in the intervention group across all cycles (mean difference 4.06, 95% confidence interval 2.65 to 5.46; P<0.001), whereas mean scores for STAI-R trait (-1.15, -1.90 to -0.41; P=0.003) and STAI-R state anxiety (-1.13, -2.06 to -0.20; P=0.02) were lower. CASE-Cancer scores were higher in the intervention group (mean difference 0.81, 0.19 to 1.43; P=0.01), and most SCNS-SF34 domains were lower, including sexuality needs (-1.56, -3.11 to -0.01; P<0.05), patient care and support needs (-1.74, -3.31 to -0.16; P=0.03), and physical and daily living needs (-2.8, -5.0 to -0.6; P=0.01). Other SCNS-SF34 domains and WLQ were not significantly different. Safety of ASyMS was satisfactory. Neutropenic events were higher in the intervention group. CONCLUSIONS: Significant reduction in symptom burden supports the use of ASyMS for remote symptom monitoring in cancer care. A "medium" Cohen's effect size of 0.5 showed a sizable, positive clinical effect of ASyMS on patients' symptom experiences. Remote monitoring systems will be vital for future services, particularly with blended models of care delivery arising from the covid-19 pandemic. TRIAL REGISTRATION: Clinicaltrials.gov NCT02356081.

A Systematic Review of Sexuality and Depression of Cervical Cancer Patients.

Objectives: The goal of this article is to investigate the correlation between sexuality and depression of cervical cancer (CC) patients. Methods: A bibliographical search was carried out in the databases CINAHL, PubMed, and Cochrane Library with the following terms in English for the years 2006 to 2017: sexuality, sexual function, sexual dysfunction, sexual problems, mood, depression, emotional distress, cervical cancer. Results: Fourteen studies were included. They present heterogeneity in the stage of the disease, the selected treatments, and their sample. From the studies, only 7 are evaluated as good methodologically. Sexual dysfunction and depression of CC patients persist for many years after treatments. The younger women, those who underwent radiotherapy, and those who had chronic fatigue, as an aftereffect of treatments, had increased depression. Women that underwent surgery and adjuvant therapy experienced the highest rates of depressive symptoms. There is a positive relationship between sexuality and depression in patients with CC. Conclusions: Sexuality and depression οf women with CC are affected by their therapies to a significant extent. There is a positive correlation between the two variables. The existing methodologically good studies are scarce, and for this reason the results cannot be generalized in all CC patients.

Adaptation and Implementation of a Mobile Phone-Based Remote Symptom Monitoring System for People With Cancer in Europe.

BACKGROUND: There has been an international shift in health care, which has seen an increasing focus and development of technological and personalized at-home interventions that aim to improve health outcomes and patient-clinician communication. However, there is a notable lack of empirical evidence describing the preparatory steps of adapting and implementing technology of this kind across multiple countries and clinical settings. OBJECTIVE: This study aimed to describe the steps undertaken in the preparation of a multinational, multicenter randomized controlled trial (RCT) to test a mobile phone-based remote symptom monitoring system, that is, Advanced Symptom Management System (ASyMS), designed to enhance management of chemotherapy toxicities among people with cancer receiving adjuvant chemotherapy versus standard cancer center care. METHODS: There were 13 cancer centers across 5 European countries (Austria, Greece, Ireland, Norway, and the United Kingdom). Multiple steps were undertaken, including a scoping review of empirical literature and clinical guidelines, translation and linguistic validation of study materials, development of standardized international care procedures, and the integration and evaluation of the technology within each cancer center. RESULTS: The ASyMS was successfully implemented and deployed in clinical practices across 5 European countries. The rigorous and simultaneous steps undertaken by the research team highlighted the strengths of the system in clinical practice, as well as the clinical and technical changes required to meet the diverse needs of its intended users within each country, before the commencement of the RCT. CONCLUSIONS: Adapting and implementing this multinational, multicenter system required close attention to diverse considerations and unique challenges primarily related to communication and clinical and technical issues. Success was dependent on collaborative and transparent communication among academics, the technology industry, translation partners, patients, and clinicians as well as a simultaneous and rigorous methodological approach within the 5 relevant countries.

Network Analysis of the Multidimensional Symptom Experience of Oncology.

Oncology patients undergoing cancer treatment experience an average of fifteen unrelieved symptoms that are highly variable in both their severity and distress. Recent advances in Network Analysis (NA) provide a novel approach to gain insights into the complex nature of co-occurring symptoms and symptom clusters and identify core symptoms. We present findings from the first study that used NA to examine the relationships among 38 common symptoms in a large sample of oncology patients undergoing chemotherapy. Using two different models of Pairwise Markov Random Fields (PMRF), we examined the nature and structure of interactions for three different dimensions of patients' symptom experience (i.e., occurrence, severity, distress). Findings from this study provide the first direct evidence that the connections between and among symptoms differ depending on the symptom dimension used to create the network. Based on an evaluation of the centrality indices, nausea appears to be a structurally important node in all three networks. Our findings can be used to guide the development of symptom management interventions based on the identification of core symptoms and symptom clusters within a network.

Undergraduate nursing students' knowledge about palliative care and attitudes towards end-of-life care: A three-cohort, cross-sectional survey.

BACKGROUND: Ensuring adequate knowledge about palliative care and positive attitudes towards death and dying are crucial educational aspects when preparing undergraduate nursing students to respond effectively to the complexities of care for people affected by a progressive, life-limiting illness. In undergraduate nursing education in Greece, the level of students' attained knowledge and developed attitudes towards palliative and end-of-life care remain unknown. PURPOSE: To investigate undergraduate nursing students' knowledge about palliative care and attitudes towards death and end-of-life care, and explore demographic and academic factors as potential moderators of student knowledge and attitudes. METHODS: We conducted a descriptive, cross-sectional, questionnaire-based survey. We recruited 2nd, 3rd and 4th year undergraduate nursing students from the country's two University Faculties. Participants completed a demographic form, the Palliative Care Quiz for Nursing (PCQN), and the Frommelt Attitudes Towards Care of the Dying (FATCOD) questionnaire. RESULTS: The final sample was 529 students (response rate = 87.6%). Mean total PCQN scores revealed low levels of knowledge. Knowledge about pain/symptom management and psychosocial/spiritual care was insufficient. Mean total FATCOD scores indicated positive, liberal and supportive attitudes towards end-of-life care, with 60% of respondents keen to care for a dying person and their family. We noted less positive attitudes mainly in relation to student comfort with the care of a dying person and his/her imminent death. Academic parameters (year of study) and student demographic characteristics (older age) were the most significant moderators of both knowledge and attitudes. Greater knowledge about palliative care was a relatively weak, yet significant, predictor of more liberal attitudes towards care of the dying. CONCLUSION: Our findings suggest that structured courses in palliative care can be a core part of undergraduate nursing education. Specific attention could be given to such areas patient-health professional communication, misconceptions and biases towards death and dying, and comfort in caring for the dying in order to prepare student nurses to psychologically deal with the sensitive and challenging process of death and dying.

Advanced Cancer Patients' Perceptions of Dignity: The Impact of Psychologically Distressing Symptoms and Preparatory Grief.

PURPOSE: The present study assesses the relationship between patient dignity in advanced cancer and the following variables: psychological distress, preparatory grief, and sociodemographic and clinical characteristics. METHODS: The sample consisted of 120 patients with advanced cancer. The self-administered questionnaires were as follows: the Preparatory Grief in Advanced Cancer Patients (PGAC), the Patient Dignity Inventory-Greek (PDI-Gr), the Greek Schedule for Attitudes toward Hastened Death (G-SAHD), and the Greek version of the Hospital Anxiety and Depression Scale (G-HADS). RESULTS: Moderate to strong statistically significant correlations were found between the 4 subscales of PDI-Gr (psychological distress, body image and role identity, self-esteem, and social support) with G-HADS, G-SAHD, and PGAC ( P < .005), while physical distress and dependency was moderately correlated with depression. Multifactorial analyses showed that preparatory grief, depression, and age influenced psychological distress, while preparatory grief, depression, and performance status influenced body image and role identity. CONCLUSIONS: Preparatory grief, psychological distress, and physical symptoms had significant associations with perceptions of dignity among patients with advanced cancer. Clinicians should assess and attend to dignity-distressing factors in the care of patients with advanced cancer.

Learning from data to predict future symptoms of oncology patients.

Effective symptom management is a critical component of cancer treatment. Computational tools that predict the course and severity of these symptoms have the potential to assist oncology clinicians to personalize the patient's treatment regimen more efficiently and provide more aggressive and timely interventions. Three common and inter-related symptoms in cancer patients are depression, anxiety, and sleep disturbance. In this paper, we elaborate on the efficiency of Support Vector Regression (SVR) and Non-linear Canonical Correlation Analysis by Neural Networks (n-CCA) to predict the severity of the aforementioned symptoms between two different time points during a cycle of chemotherapy (CTX). Our results demonstrate that these two methods produced equivalent results for all three symptoms. These types of predictive models can be used to identify high risk patients, educate patients about their symptom experience, and improve the timing of pre-emptive and personalized symptom management interventions.

Congruence Between Latent Class and K-Modes Analyses in the Identification of Oncology Patients With Distinct Symptom Experiences.

CONTEXT: Risk profiling of oncology patients based on their symptom experience assists clinicians to provide more personalized symptom management interventions. Recent findings suggest that oncology patients with distinct symptom profiles can be identified using a variety of analytic methods. OBJECTIVES: The objective of this study was to evaluate the concordance between the number and types of subgroups of patients with distinct symptom profiles using latent class analysis and K-modes analysis. METHODS: Using data on the occurrence of 25 symptoms from the Memorial Symptom Assessment Scale, that 1329 patients completed prior to their next dose of chemotherapy (CTX), Cohen's kappa coefficient was used to evaluate for concordance between the two analytic methods. For both latent class analysis and K-modes, differences among the subgroups in demographic, clinical, and symptom characteristics, as well as quality of life outcomes were determined using parametric and nonparametric statistics. RESULTS: Using both analytic methods, four subgroups of patients with distinct symptom profiles were identified (i.e., all low, moderate physical and lower psychological, moderate physical and higher Psychological, and all high). The percent agreement between the two methods was 75.32%, which suggests a moderate level of agreement. In both analyses, patients in the all high group were significantly younger and had a higher comorbidity profile, worse Memorial Symptom Assessment Scale subscale scores, and poorer QOL outcomes. CONCLUSION: Both analytic methods can be used to identify subgroups of oncology patients with distinct symptom profiles. Additional research is needed to determine which analytic methods and which dimension of the symptom experience provide the most sensitive and specific risk profiles.

Psychometric Properties of the Greek Version of the Patient Dignity Inventory in Advanced Cancer Patients.

CONTEXT: The patient dignity inventory (PDI) is an instrument to measure dignity distressing aspects at the end of life. OBJECTIVES: The aims of the present study were the translation of the PDI in Greek language as well as to measure its psychometric aspects in a palliative care unit. METHODS: A back-translation method was obtained at the Greek version. One hundred twenty advanced cancer patients completed the Greek version of the PDI, the Greek hospital anxiety and depression scale, the Greek schedule of attitudes toward hastened death (SAHD-Gr), and the Greek 12-item short form health survey. RESULTS: Confirmatory factor analysis failed to fit to the original instrument's structure and exploratory factor analysis was conducted revealing five factors ("Psychological Distress," "Body Image and Role Identity," "Self-Esteem," "Physical Distress and Dependency," and "Social Support"). The psychometric analysis of the PDI-Gr demonstrated a good concurrent validity, and the instrument discriminated well between subgroups of patients regarding age differences. Cronbach α were between 0.71 and 0.9 showing a good internal consistency. CONCLUSION: The Greek version of the PDI showed good psychometric properties in advanced cancer patients, supported the usefulness of the instrument assessing the sense of dignity distressing aspects of the terminally ill cancer patients.

The eSMART study protocol: a randomised controlled trial to evaluate electronic symptom management using the advanced symptom management system (ASyMS) remote technology for patients with cancer.

INTRODUCTION: While some evidence exists that real-time remote symptom monitoring devices can decrease morbidity and prevent unplanned admissions in oncology patients, overall, these studies have significant methodological weaknesses. The electronic Symptom Management using the Advanced Symptom Management System (ASyMS) Remote Technology (eSMART) study is designed to specifically address these weaknesses with an appropriately powered, repeated-measures, parallel-group stratified randomised controlled trial of oncology patients. METHODS AND ANALYSIS: A total of 1108 patients scheduled to commence first-line chemotherapy (CTX) for breast, colorectal or haematological cancer will be recruited from multiple sites across five European countries.Patients will be randomised (1:1) to the ASyMS intervention (intervention group) or to standard care currently available at each site (control group). Patients in the control and intervention groups will complete a demographic and clinical questionnaire, as well as a set of valid and reliable electronic patient-reported outcome measures at enrolment, after each of their CTX cycles (up to a maximum of six cycles) and at 3, 6, 9 and 12 months after completion of their sixth cycle of CTX. Outcomes that will be assessed include symptom burden (primary outcome), quality of life, supportive care needs, anxiety, self-care self-efficacy, work limitations and cost effectiveness and, from a health professional perspective, changes in clinical practice (secondary outcomes). ETHICS AND DISSEMINATION: Ethical approval will be obtained prior to the implementation of all major study amendments. Applications will be submitted to all of the ethics committees that granted initial approval.eSMART received approval from the relevant ethics committees at all of the clinical sites across the five participating countries. In collaboration with the European Cancer Patient Coalition (ECPC), the trial results will be disseminated through publications in scientific journals, presentations at international conferences, and postings on the eSMART website and other relevant clinician and consumer websites; establishment of an eSMART website (www.esmartproject.eu) with publicly accessible general information; creation of an eSMART Twitter Handle, and production of a toolkit for implementing/utilising the ASyMS technology in a variety of clinical practices and other transferable health care contexts. TRIAL REGISTRATION NUMBER: NCT02356081.

Nursing Care Plans Based on NANDA, Nursing Interventions Classification, and Nursing Outcomes Classification: The Investigation of the Effectiveness of an Educational Intervention in Greece.

PURPOSE: The aim of this study was to investigate the effectiveness of an educational intervention on home nursing care plans based on NANDA, Nursing Interventions Classification, and Nursing Outcomes Classification for registered nurses working at primary healthcare settings in Greece. METHODS: This is a quasi-experimental study without a control group. The sample consisted of 19 registered nurses. The study tool was a questionnaire administered pre- and post-educational intervention. FINDINGS: The intervention improved their skills on nursing diagnoses' nomination, proper formulation, and individualization of defining characteristics, but it did not improve them in desired outcomes formulation. CONCLUSIONS: A significant effect of an educational intervention on nursing care plans was demonstrated. IMPLICATIONS FOR NURSING PRACTICE: Nurses' knowledge and attitudes are important for understanding and integrating documentation within the nursing process.

Effects of patient and personal demographic, clinical and psychosocial characteristics on the burden of family members caring for patients with advanced cancer in Greece.

PURPOSE: Caregiving burden affects the lives of family members providing care to patients with advanced cancer, with a host of factors possibly contributing to this. The aim of this study was to explore the effects of patient and caregiver variables on the perceptions of burden in families caring for a loved one living with advanced cancer in Greece. METHODS: A convenience sample of 100 pairs of patients receiving palliative radiotherapy for advanced cancer and their respective primary family caregivers were consecutively recruited at one radiotherapy centre. Patients and caregivers completed a set of questionnaires during face-to-face interviews. Correlational and multiple regression analyses were performed to identify potential predictors of caregiving burden. RESULTS: Caregiving burden was linked to both patient (gender, age, past surgery or chemotherapy treatment, depression and impact of cancer-related symptoms) and caregiver variables (gender, family status, education, place of residence, previous experience of care, employment status, difficulty of caregiving, anxiety and depression). In multiple regression analyses, caregiving burden was significantly predicted by caregivers' depressed mood, perceived difficulty of caregiving, family status, employment status, as well as by patients' past surgery, in a model that explained 49% of the total variance. CONCLUSIONS: Greek family caregivers reporting greater depressive mood and difficulty with caregiving tasks, those married, those not employed, and those who cared for patients who had not undergone surgery were found at greater distress and disadvantage. Systematic assessment and intervention strategies are required to identify these vulnerable carers and help them cope when sharing in patient's cancer experience.

Does tissue ischemia actually contribute to leak after sleeve gastrectomy? An experimental study.

BACKGROUND: Staple line leak, although rare, is among the most common postoperative complications after sleeve gastrectomy (SG) and usually occurs in the gastroesophageal (GE) junction. Increased intragastric pressure, regional ischemia, and technical failure of stapling devices have been reported as the main risk factors of postoperative leak. The aim of this study was to evaluate the impact of ischemia and intraluminal pressure in leak appearance. METHODS: Landrace swine (n = 12) were subjected to SG and total gastrectomy subsequently. Lactic acid, glycerol, and pyruvate were measured by microdialysis in GE junction and pylorus before and nine times after operation, and lactate/pyruvate (L/P) ratio was calculated as well. Moreover, ex vivo air was insufflated inside the tubularized stomach till a rupture of the staple line occurs. Maximum air pressure reached and location of rupture were recorded. RESULTS: Increase of lactic acid and L/P ratio were demonstrated in GE junction measurements; however, when the measurements between GE junction and pylorus were compared, no statistically significant differences were found, with the exception of a slightly increased lactate concentration in pylorus in the midst of measurements. The maximum air pressure recorded varied from 3 to 75 mmHg (mean 24.5 mmHg) and the majority of ruptures (n = 8) occurred in GE junction. In one of them, clip displacement was noticed. CONCLUSIONS: No evidence of increased ischemia in GE junction compared to pylorus was recorded. Increased intraluminal pressure and stapling malfunction may play the most important role in leak appearance.

A new pancreaticojejunostomy technique: a battle against postoperative pancreatic fistula.

AIM: To present a new technique of end-to-side, duct-to-mucosa pancreaticojejunostomy with seromuscular jejunal flap formation, and insertion of a silicone stent. METHODS: We present an end-to-side, duct-to-mucosa pancreaticojejunostomy with seromuscular jejunal flap formation, and the insertion of a silicone stent. This technique was performed in thirty-two consecutive patients who underwent a pancreaticoduodenectomy procedure by the same surgical team, from January 2005 to March 2011. The surgical procedure performed in all cases was classic pancreaticoduodenectomy, without preservation of the pylorus. The diagnosis of pancreatic leakage was defined as a drain output of any measurable volume of fluid on or after postoperative day 3 with an amylase concentration greater than three times the serum amylase activity. RESULTS: There were 32 patients who underwent end-to-side, duct-to-mucosa pancreaticojejunostomy with seromuscular jejunal flap formation. Thirteen of them were women and 19 were men. These data correspond to 40.6% and 59.4%, respectively. The mean age was 64.2 years, ranging from 55 to 82 years. The mean operative time was 310.2 ± 40.0 min, and was defined as the time period from the intubation up to the extubation of the patient. Also, the mean time needed to perform the pancreaticojejunostomy was 22.7 min, ranging from 18 to 25 min. Postoperatively, one patient developed a low output pancreatic fistula, three patients developed surgical site infection, and one patient developed pneumonia. The rate of overall morbidity was 15.6%. There was no 30-d postoperative mortality. CONCLUSION: This modification appears to be a significantly safe approach to the pancreaticojejunostomy without adversely affecting operative time.

The effect of laparoscopic sleeve gastrectomy on the antireflux mechanism: can it be minimized?

BACKGROUND: Laparoscopic sleeve gastrectomy (LSG) is a promising procedure for the treatment of morbid obesity. The stomach is usually transected near the angle of His; hence, the lower esophageal sphincter (LES) may be affected with consequences on postoperative gastroesophageal reflux disease (GERD). The purpose of this study was to examine the effect of LSG on the LES and postoperative GERD. METHODS: Severely obese asymptomatic patients submitted to LSG underwent esophageal manometry and GERD evaluation preoperatively and at least 6 weeks postoperatively. Data reviewed included patient demographics, manometric measurements, GERD symptoms, and pathology. Statistical analysis was performed by SPSS software. RESULTS: Twelve male and eleven female patients participated in the study. Mean age was 38.5 ± 10.9 years, and initial body mass index was 47.9 ± 5.1 kg/m(2). At follow-up examination, mean excess body mass index loss was 32.3 ± 12.7%. The LES total and abdominal length increased significantly postoperatively, whereas the contraction amplitude in the lower esophagus decreased. There was an increase in reflux symptoms postoperatively (p < 0.009). The operating surgeon who mostly approximated the angle of His resulted in an increased abdominal LES length (p < 0.01). The presence of esophageal tissue in the specimen correlated with increased total GERD score (p < 0.05). CONCLUSIONS: LSG weakens the contraction amplitude of the lower esophagus, which may contribute to postoperative reflux deterioration. It also increases the total and the abdominal length of the LES, especially when the angle of His is mostly approximated. However, if this approximation leads to esophageal tissue excision, reflux is again aggravated. Thus, stapling too close to the angle of His should be done cautiously.

Porcine model of hemorrhagic shock with microdialysis monitoring.

BACKGROUND: A number of experimental protocols have been used to try to reproduce the clinical scenarios of hemorrhagic shock. The present study reports on an experimental swine model of controlled hemorrhagic shock that incorporates microdialysis monitoring for the evaluation of tissue perfusion and oxygenation. The aim of our study was to provide a reproducible, accurate, and reliable model for the testing and evaluation of therapeutic interventions in the area of hemorrhagic shock. METHODS: Landrace swine (n = 8) were subjected to controlled hemorrhagic shock, with a mean arterial pressure of 35 ± 5 as the endpoint. Six more pigs were used as the control group. Microdialysis monitoring of the tissue lactate/pyruvate ratio was used. The mean arterial pressure, heart rate, hematocrit, hemoglobin, and lactate/pyruvate ratio measurements were obtained just before (phase A) and 30 min after (phase B) hemorrhage in the study group; the control group underwent the same measurements at the corresponding points. RESULTS: The mean arterial pressure, hematocrit, and hemoglobin were lower (P < 0.05) in the study group than in the control group at phase B and compared with the values for the study group at phase A. Also, the lactate/pyruvate ratio and heart rate were greater (P < 0.05) in the study group than in control group at phase B and compared with the values for the study group at phase A. CONCLUSIONS: This model of hemorrhagic shock is effective and correlates with the clinical parameters of tissue oxygenation, as documented by microdialysis.