Computerized Cognitive Training in Mild Cognitive Impairment: Findings in African Americans and Caucasians.

BACKGROUND: African Americans with MCI may be at increased risk for dementia compared to Caucasians. The effect of race on the efficacy of cognitive training in MCI is unclear. METHODS: We used data from a two-site, 78-week randomized trial of MCI comparing intensive, home-based, computerized training with Web-based cognitive games or Web-based crossword puzzles to examine the effect of race on outcomes. The study outcomes were changes from baseline in cognitive and functional scales as well as MRI-measured changes in hippocampal volume and cortical thickness. Analyses used linear models adjusted for baseline scores. This was an exploratory study. RESULTS: A total of 105 subjects were included comprising 81 whites (77.1%) and 24 African Americans (22.8%). The effect of race on the change from baseline in ADAS-Cog-11 was not significant. The effect of race on change from baseline to week 78 in the Functional Activities Questionnaire (FAQ) was significant with African American participants' FAQ scores showing greater improvements at weeks 52 and 78 (P = 0.009, P = 0.0002, respectively) than white subjects. Within the CCT cohort, FAQ scores for African American participants showed greater improvement between baseline and week 78, compared to white participants randomized to CCT (P = 0.006). There was no effect of race on the UPSA. There was no effect of race on hippocampal or cortical thickness outcomes. CONCLUSIONS: Our preliminary findings suggest that web-based cognitive training programs may benefit African Americans with MCI at least as much as Caucasians, and highlight the need to further study underrepresented minorities in AD prevention trials. (Supported by the National Institutes of Health, National Institute on Aging; ClinicalTrials.gov number, NCT03205709.).

Expectancy Does Not Predict 18-month Treatment Outcomes with Cognitive Training in Mild Cognitive Impairment.

BACKGROUND: Computerized cognitive training (CCT) has emerged as a potential treatment option for mild cognitive impairment (MCI). It remains unclear whether CCT's effect is driven in part by expectancy of improvement. OBJECTIVES: This study aimed to determine factors associated with therapeutic expectancy and the influence of therapeutic expectancy on treatment effects in a randomized clinical trial of CCT versus crossword puzzle training (CPT) for older adults with MCI. DESIGN: Randomized clinical trial of CCT vs CPT with 78-week follow-up. SETTING: Two-site study - New York State Psychiatric Institute and Duke University Medical Center. PARTICIPANTS: 107 patients with MCI. INTERVENTION: 12 weeks of intensive training with CCT or CPT with follow-up booster training over 78 weeks. MEASUREMENTS: Patients rated their expectancies for CCT and CPT prior to randomization. RESULTS: Patients reported greater expectancy for CCT than CPT. Lower patient expectancy was associated with lower global cognition at baseline and older age. Expectancy did not differ by sex or race. There was no association between expectancy and measures of everyday functioning, hippocampus volume, or apolipoprotein E genotype. Expectancy was not associated with change in measures of global cognition, everyday functioning, and hippocampus volume from baseline to week 78, nor did expectancy interact with treatment condition. CONCLUSIONS: While greater cognitive impairment and increased age was associated with low expectancy of improvement, expectancy was not associated with the likelihood of response to treatment with CPT or CCT.

Two-Dimensional Ultrasound Assessment of Long-Term Intra-Abdominal Organ Changes in Children with Sickle Cell Anemia during Steady State: A Comparative Study.

BACKGROUND: Sickle cell anemia (SCA) is a hereditary blood disorder with global prevalence, including in Nigeria. Despite advancements in SCA care management, understanding the long-term impact on organs during steady state has remained inconclusive. AIM: This study aimed to investigate the long-term changes in intra-abdominal organs of SCA children compared with non-SCA children during steady state using two-dimensional ultrasound assessment. MATERIALS AND METHODS: A total of 116 children (58 SCA and 58 controls) were enrolled between June 2021 and July 2022. Clinico-demographic data were collected through an interviewer-administered questionnaire. Two-dimensional ultrasound was used to measure the liver, spleen, kidneys, and inferior vena cava in all subjects. Age-matched controls had AA or AS genotypes. RESULTS: Of the 58 patients with SCA, 65.5% were males with an overall mean age of 8.1 ± 3.4 years, while among the non-SCA cohort (n = 58), 48.3% were males with an overall mean age of 8.7 ± 3.9 years. There was no statistically significant difference in the age and gender distribution between the SCA and non-SCA cohorts (P = 0.390 and P = 0.091, respectively). SCA subjects had a larger mean hepatic size than non-SCA subjects (12.09 cm ± 2.23 vs. 11.67 cm ± 1.96; P = 0.276) but smaller mean splenic size (8.01 cm ± 1.89 vs. 8.19 cm ± 1.61; P = 0.577) and inferior vena cava diameter (1.16 cm ± 0.29 vs. 1.25 cm ± 0.33; P = 0.100). Left kidney length and breadth were significantly greater in SCA patients (8.91 ± 1.16 vs. 8.27 ± 1.30; P = 0.006 and 4.15 ± 0.92 vs. 3.79 ± 0.48; P = 0.008, respectively). CONCLUSION: This study highlights the utility of two-dimensional ultrasound assessment in monitoring intra-abdominal organ changes in SCA children, suggesting its cost-effective benefits in monitoring health outcomes in SCA patients.

Erratum to: Blueberry Supplementation Effects on Neuronal and Pathological Biomarkers in Subjects at Risk for Alzheimer's Disease: A Pilot Study.

[This corrects the article DOI: 10.14283/jarlife.2023.13.].

Prevalence of Pica amongst Pregnant Women attending Antenatal Clinic of a Tertiary Clinic in South-East, Nigeria.

BACKGROUND: The eating of non-food substances during pregnancy is called pica. It is commonly practised by pregnant women worldwide, including in Nigeria, and has been reported to have a mixed impact on their health. AIM: This study sought to determine the prevalence of pica amongst pregnant women attending the antenatal clinic in Nnamdi Azikiwe University Teaching Hospital (NAUTH), Anambra State, South East, Nigeria. MATERIALS AND METHODS: After obtaining approval from the Ethics And Research Committees in Nnamdi Azikiwe University Teaching Hospital, a cross-sectional survey of 326 consenting pregnant women who met the eligibility criteria was conducted. They were selected by systematic random sampling from 5th September to 5th of November 2022. Data was obtained by interview-based questionnaires and analyzed using the statistical package for Social Sciences (SPSS) version 25.0. The level of significance for this study was set at P < 0.05 for all analyses. RESULTS: The prevalence of pica among this population was 25.8%, and their mean age was 29.3 ± 4.8. The majority identified smell 45 (53.6%) and taste 40 (47.6%) as the reasons for pica practice. Geophagy dominated other forms of pica as white clay was the most consumed item 60 (72.6%). CONCLUSION: This study showed that pica practice was common among pregnant women in this study and geophagy was the dominant form of pica. There is a need to step up health education on the effects of pica in pregnancy.

CONTEXTE: La consommation de substances non alimentaires pendant la grossesse est appelée pica. Il est couramment pratiqué par les femmes enceintes dans le monde entier, y compris au Nigéria, et il a été signalé qu'il avait un impact mitigé sur leur santé. OBJECTIF: Cette étude visait à déterminer la prévalence du pica chez les femmes enceintes fréquentant la clinique prénatale du Nnamdi Azikiwe University Teaching Hospital (NAUTH), dans l'État d'Anambra, dans le sud-est du Nigeria. MATÉRIEL ET MÉTHODES: Après avoir obtenu l'approbation des comités d'éthique et de recherche du Nnamdi Azikiwe University Teaching Hospital, une enquête transversale a été menée auprès de 326 femmes enceintes consentantes qui répondaient aux critères d'éligibilité. Elles ont été sélectionnées par échantillonnage aléatoire systématique du 5 septembre au 5 novembre 2022. Les données ont été obtenues à l'aide de questionnaires basés sur des entretiens et analysées à l'aide du progiciel de statistiques pour les sciences sociales (SPSS) version 25.0. Le niveau de signification de cette étude a été fixé à P < 0,05 pour toutes les analyses. RÉSULTATS: La prévalence du pica dans cette population était de 25,8 % et l'âge moyen était de 29,3 ± 4,8 ans. La majorité a identifié l'odeur 45 (53,6%) et le goût 40 (47,6%) comme les raisons de la pratique du pica. La géophagie domine les autres formes de pica, l'argile blanche étant l'élément le plus consommé (60, soit 72,6 %). CONCLUSION: Cette étude a montré que la pratique du pica était courante chez les femmes enceintes et que la géophagie était la forme dominante de pica. Il est nécessaire de renforcer l'éducation sanitaire sur les effets du pica pendant la grossesse. Mots-clés: Pica, Pratiques de pica, Phagie, Femmes enceintes, Clinique prénatale, Nigeria.

Blueberry Supplementation Effects on Neuronal and Pathological Biomarkers in Subjects at Risk for Alzheimer's Disease: A Pilot Study.

Background: There is a need to develop non-invasive practical lifestyle interventions for preventing Alzheimer's disease (AD) in people at risk, such as those with mild cognitive impairment (MCI). Blueberry consumption has been associated with reduced risk of dementia in some epidemiologic studies and with improvements in cognition in healthy aging adults. Blood-based biomarkers have emerged at the forefront of AD therapeutics research spurred by the development of reliable ultra-sensitive "single-molecule array" assays with 100-1000-fold greater sensitivity over traditional platforms. Objective: The purpose of this study was to examine the effect of blueberry supplementation in MCI on six blood biomarkers: amyloid-beta 40 (Aß40), amyloid-beta 42 (Aß42), phosphorylated Tau181 (ptau181), neurofilament light (NfL), Glial Fibrillary acidic protein (GFAP), and Brain-Derived Neurotrophic Factor (BDNF). Methods: This was a 12-week, open-label, pilot trial of 10 participants with MCI (mean age 80.2 years + 5.16). Subjects consumed 36 grams per day of lyophilized blueberry powder in a split dose consumed with breakfast and dinner. Baseline and endpoint venous blood was analyzed using an ultrasensitive SIMOA assay. Our aim was to test if blueberry supplementation would particularly impact p-tau181, NfL, and GFAP elevations associated with the neurodegenerative process. Results: There were no statistically significant (p < 0.05) changes from baseline to endpoint for any of the biomarker values or in the ratios of Aß42 / Aß40 and ptau181/ Aß42. Adverse effects were mild and transient; supplementation was relatively well tolerated with all subjects completing the study. Conclusion: To our knowledge, this is the first study to prospectively examine the effects of blueberry supplementation on a panel of blood biomarkers reflecting the neurodegenerative process. Our findings raise two possibilities - a potential stabilization of the neurodegenerative process or a lack of a direct and acute effect on beta-amyloid/tau/glial markers. A larger controlled study is warranted.

Preliminary outcome of use of parenterally administered tranexamic acid during primary total knee replacement.

Background: Perioperative blood loss and the need for blood transfusion following total knee arthroplasty (TKA) has been a source of concern for many arthroplasty surgeons and patients over the years. Tranexamic acid (TXA) is increasingly being used by surgeons in limiting perioperative blood loss and the subsequent need for transfusion during TKA. Aim: This study aims to determine the efficacy of TXA in preventing perioperative blood loss, transfusion needs of patients that underwent TKA, complications, and its financial implications of its use in our institution. Patients and Methods: The study was a clinical comparative audit of perioperative blood loss and transfusion needs in primary TKA patients. The study population was divided into two groups of equal numbers (n = 40). Group A, who did not receive perioperative TXA, had TKA prior to the adoption of TXA in our institution, whereas group B, who received TXA, had TKA after TXA was adopted. Results: The mean postoperative hemoglobin was 9.49 g/dl for group A and 10.15 g/dl for group B (P = 0.021). The mean postoperative blood drainage was 888.25 ml for group A and 821.67 ml for group B (P = 0.397). The number of patients transfused in group A was 17 (42.5%) against 7 (17.5%) in group B. The mean postoperative transfusion volume was 270 ml and 101.25 ml for group A and B, respectively (P = 0.014). The mean total transfusion volume was 450 ml and 277 ml in group A and B, respectively (P = 0.063). Conclusions: The use of TXA in TKA was shown to be beneficial in our study as it resulted in a statistically significant reduction in the postoperative transfusion volumes and higher postoperative hemoglobin levels.

Quality evaluation of egg-free cake from soft tofu.

Soft tofu was used to produce a cake to ascertain its suitability in producing egg-free cake (EFC) for vegans and individuals allergic to eggs. A conventional cake (CVC) served as control and the quality characteristics of the EFC and CVC were evaluated. Results showed the egg-free cake had physical properties which were significantly (p < 0.05) higher in weight (1611 g), density (0.81 kg/m3) and specific volume (1.23%) than Conventional cake (1516 g, 0.61 kg/m3 and 0.25%, respectively). CVC showed significantly p < 0.05 higher height (8.50 cm) and volume (2644.78 m3) which is desirable in the baked cake. EFC showed significantly p < 0.05 higher values in ash (3.13%), moisture (24.01%), fibre (2.40%) and carbohydrate (52.34%), while CVC had significant (p < 0.05) higher values in protein (7.38%) and fat (16.34%). The taste (0.55), colour (0.55), texture (0.55) and aroma (0.55) of EFC was more preferred than CVC (0.45, 0.40, 0.45 and 0.45, respectively). Soft tofu showed suitability and an acceptable replacement for egg in making Egg-free cakes for vegetarians and individuals allergic to egg.

Chronic pulmonary aspergillosis as a cause of smear-negative TB and/or TB treatment failure in Nigerians.

OBJECTIVE: To evaluate chronic pulmonary aspergillosis (CPA) as an alternative diagnosis of smear-negative tuberculosis (TB) and treatment failure in TB patients in Nigeria. METHODS: We conducted a cross-sectional multicentre survey in human immunodeficiency virus (HIV) positive and negative adult patients at the end of their TB treatment in clinics in Lagos and Ilorin states. All were assessed using clinical examination, chest X-ray (CXR) and aspergillus immunoglobulin G (IgG) serology, and some for sputum fungal culture. CPA was defined as a positive Aspergillus fumigatus IgG titre with compatible CXR or a positive sputum culture of Aspergillus with a visible fungal ball on CXR with symptoms of underlying lung disease. RESULTS: Of 208 patients recruited between June 2014 and May 2015, 153 (73.6%) were HIV-positive. The mean age was 39.8 years, 124 (59.6%) were female and 39 (18.8%) were unable to work. The median CD4 count was 169.5 cells/ml (range 4-593) in HIV-infected patients with positive Aspergillus IgG. Overall, 109 (52.4%) had documented TB, 140 (67.3%) had a productive cough and 50 had haemoptysis. CPA prevalence was 8.7%; 10 (6.5%) had HIV infection and 8 (14.5%) were HIV-negative (Fisher's exact P = 0.092). CONCLUSION: CPA is a neglected disease in Nigeria, and most cases match the World Health Organization diagnostic criteria for smear-negative TB.

Multimodal approach to blood conservation in the surgical patient.

Allogeneic blood remains a scarce and expensive resource, even as the risks of disease transmission and other complications associated with blood transfusion are well known. Blood conservation, however, is a quality-of-care concept that transcends these and other known and unknown complications of transfusion, to involve a gamut of strategies meant to prevent exposure of patients to allogeneic blood. In urging a halt to incessant allogeneic blood transfusion, we report three cases to highlight the benefits of multimodal multidisciplinary collaboration in blood conservation. The three patients were chosen on account of either religious objection to any blood transfusion or the likelihood of exposure to several units of allogeneic blood. The blood conservation plan proposed for each patient was discussed with the respective surgeon and patient. Multimodal multidisciplinary approach to blood conservation utilising combination of strategies best suited for each individual patient will remarkably reduce the exposure of patients to allogeneic blood thereby ensuring better use of the scarce resource, and and preventing potential clinical complications and spiritual trespass of Jehovah's Witnesses.

An overview on the use of the laryngeal mask airway amongst anaesthesia practitioners in a developing country.

BACKGROUND: The aim of this study is to provide an overview on the use of the Laryngeal Mask Airway (LMA) amongst anaesthesia practitioners in Nigeria MATERIALS AND METHODS: This is a multicentre questionnaire based study involving eight tertiary health care institutions in Nigeria. The questionnaires were administered to anaesthetists. They were standardised open- and close-ended questions which were completed in person. The questionnaire was subdivided into a set of questions which include: status of the anaesthetist; the routine use of LMA in general anaesthesia and as a device for airway management in difficult airway. Statistical analyses were done by simple percentages. RESULTS: The numbers of respondents were seventy; 38 were junior residents, 20 were senior residents and 12 were consultants. Sixty (85.7%) respondent had personally used LMA, while 10 had never used it and they were all junior residents. Classic LMA was most commonly used (88%), followed by intubating LMA (7.5%), and proseal LMA (4.5%). Most of the respondents (67.1%) have used LMA in difficult airway management while 10% of respondents had used it in airway management during cardiopulmonary resuscitation (CPR). The reason for not using LMA routinely for general anaesthesia was due to unavailability in 15.7% of respondents, inexperience in 8.6% and habitual in 30%. CONCLUSION: Airway management is a vital discipline in the specialty of anaesthesia. The use of LMA as an airway device in the practice of anaesthesia in our setting is inadequate. Training, re-training and continuous medical education of anaesthetists' very necessary to improve our practice.

Weekend versus weekday hospital deaths: analysis of in-patient data in a Nigerian tertiary healthcare center.

AIM: This study aims at comparing weekday deaths to weekend deaths of in-patients of a tertiary hospital in Nigeria. MATERIALS AND METHODS: This is a 10-year retrospective survey conducted at the Nnamdi Azikiwe University Teaching Hospital in which the death records of the hospital were accessed from the various wards and health records department to extract relevant data pertaining to the time of hospital death. Tests of statistical significance were done using Chi-square test at 95% confidence intervals. RESULTS: A total of 3934 deaths were recorded during the period of study. The ages ranged from a few hours to 94 years with a mean age of 38.5 years. The male to female ratio was 1.2:1. An average of 547 weekend deaths and 568 weekday deaths were recorded, giving a ratio of 0.96:1. A ratio of weekend to weekday death rate of 0.99:1 and 0.93:1 for the males and females, respectively was noted. The labor ward, followed by the intensive care unit (ICU) had the highest weekend to weekday death ratio of 1.72:1 ( P = 0.0461) and 1.41:1 ( P = 0.1440), respectively. Weekend deaths were less in the other wards, with the gynaecological ward having the least ratio of 0.63:1 ( P = 0.7360). CONCLUSION: The rate of hospital deaths was generally found not to vary significantly over the weekends and weekdays in the hospital except for the labor ward which had significantly higher weekend to weekday death rates of 1.72:1. There is therefore need for confidential enquiry into the causes of hospital deaths, especially in the labor ward, in order to identify and prevent avoidable deaths.

Weekend Versus Weekday Hospital Deaths: Analysis of In-Patient Data in a Nigerian Tertiary Healthcare Center

Aim: This study aims at comparing weekday deaths to weekend deaths of in-patients of a tertiary hospital in Nigeria. Materials and Methods: This is a 10-year retrospective survey conducted at the Nnamdi Azikiwe University Teaching Hospital in which the death records of the hospital were accessed from the various wards and health records department to extract relevant data pertaining to the time of hospital death. Tests of statistical significance were done using Chi-square test at 95 confidence intervals.Results: A total of 3934 deaths were recorded during the period of study. The ages ranged from a few hours to 94 years with a mean age of 38.5 years. The male to female ratio was 1.2:1. An average of 547 weekend deaths and 568 weekday deaths were recorded; giving a ratio of 0.96:1. A ratio of weekend to weekday death rate of 0.99:1 and 0.93:1 for the males and females; respectively was noted. The labor ward; followed by the intensive care unit (ICU) had the highest weekend to weekday death ratio of 1.72:1 (P = 0.0461) and 1.41:1 (P = 0.1440); respectively. Weekend deaths were less in the other wards; with the gynaecological ward having the least ratio of 0.63:1 (P = 0.7360). Conclusion: The rate of hospital deaths was generally found not to vary significantly over the weekends and weekdays in the hospital except for the labor ward which had significantly higher weekend to weekday death rates of 1.72:1. There is therefore need for confidential enquiry into the causes of hospital deaths; especially in the labor ward; in order to identify and prevent avoidable deaths

Proximate determinants of antenatal care utilization among women in southeastern Nigeria.

BACKGROUND: In order to scale up Antenatal services, there is need to determine the factors that deter women from accessing antenatal care. AIM: To determine the proximate factors that affect utilization of antenatal care among market women in Nnewi, southeastern Nigeria. MATERIALS/METHOD: A cross sectional survey of 400 market women using semi structured questionnaires and focus group discussions. RESULT: Out of the 398 studied women, 97.2% attended antenatal care in their last pregnancy. Most (64.5%) of them booked after the third trimester and majority of the women received antenatal care from the private specialist hospitals (37.4%), followed by the private general practice hospitals (34.7%) and government hospitals (17.8%). The main reasons for choosing antenatal care facilities were the perceived friendliness of the staff (33.9%), availability of staff always (27.4%) and proximity of the facility (17.4%). Financial considerations accounted for 4.5% of the reasons for the choice of facility. There was no significant influence of age, parity and religion on the utilization of antenatal care. However, the likelihood of ANC attendance was significantly lower among the house wives (x2 = 14.2; p = 0.0). There was no association between choice of facility for ANC and age, parity, occupation or religion. The main reasons identified by the FGD discussants for preferring the private hospitals were more friendly and available staff. Also late booking was mainly attributed to wrong advice from friends and husbands refusal to provide money. Antenatal care attendance rate was high among the studied women and most of the women utilize private hospitals for care. Staff friendliness and availability at all times were the main reasons for choice of ANC facilities. There is the need to address the negative attitudes of the staff in government hospitals.

Contraceptive choices and practices among urban women in southeastern Nigeria.

BACKGROUND: Determining the contraceptive choices among the women is the first step in scaling up family planning methods. OBJECTIVE: To determine the contraceptive choices and practices as well as the underlining factors among market women in Nnewi, southeastern Nigeria. SUBJECTS/METHOD: This is a cross sectional descriptive study of market women, that assessed their contraceptive choices and practices. RESULT: Knowledge about family planning was 96.5%. One hundred and seventy five (44.0%) of the interviewed women were currently using a family planning method while 59.0% had ever used a method. The common methods in use were the natural method (24.1%), withdrawal method (7.5%) and the IUCDs (6.1%). The commonest ever used method was the natural method (26.7%) followed by withdrawal method (10.6%) and condom (7.8%). Fear of family planning commodities interfering with future fertility was the commonest reason for non use of family planning services (14.6), followed by the fear of the side effects (10.6%). Seventy one (17.8%) of the non-users had no reason. The use of family planning services was significantly high among the women aged 35 and above (x2 = 9.98; P = 0.04) and the (x2 = 23.8; P = 0.00). Focus group discussions indicated that husband's refusal, fear of side effects, cancer and delayed fertility were the main barriers to the use of family planning methods. CONCLUSION: The contraceptive prevalence rate among Nnewi market women is high and cuts across all religions and social classes. However, the methods in common use are associated with high failure rates. The use of the more reliable methods should be encouraged.

Assessment of the efficacy and toxicity of (131)I-metaiodobenzylguanidine therapy for metastatic neuroendocrine tumours.

(131)I-metaiodobenzylguanidine ((131)I-MIBG) is a licensed palliative treatment for patients with metastatic neuroendocrine tumours. We have retrospectively assessed the consequences of (131)I-MIBG therapy in 48 patients (30 gastroenteropancreatic, 6 pulmonary, 12 unknown primary site) with metastatic neuroendocrine tumours attending Royal Liverpool University Hospital between 1996 and 2006. Mean age at diagnosis was 57.6 years (range 34-81). (131)I-MIBG was administered on 88 occasions (mean 1.8 treatments, range 1-4). Twenty-nine patients had biochemical markers measured before and after (131)I-MIBG, of whom 11 (36.7%) showed >50% reduction in levels post-therapy. Forty patients had radiological investigations performed after (131)I-MIBG, of whom 11(27.5%) showed reduction in tumour size post-therapy. Twenty-seven (56.3%) patients reported improved symptoms after (131)I-MIBG therapy. Kaplan-Meier analysis showed significantly increased survival (P=0.01) from the date of first (131)I-MIBG in patients who reported symptomatic benefit from therapy. Patients with biochemical and radiological responses did not show any statistically significant alteration in survival compared to non-responders. Eleven (22.9%) patients required hospitalisation as a consequence of complications, mostly due to mild bone marrow suppression. (131)I-MIBG therefore improved symptoms in more than half of the patients with metastatic neuroendocrine tumours and survival was increased in those patients who reported a symptomatic response to therapy.

Effect of hematocrit on dialyzer urea and creatinine clearance indices in a hemodialysis patient with erythrocytosis.

The association between azotemic index dialyzer clearances and hematocrit was investigated in a 63-year-old dialysis-dependent man with acquired renal cysts. During 43 months of hemodialysis, hematocrit rose from 27.3 to 65.0 vol%, as a consequence of high serum erythropoietin levels. Concomitantly, dry weight also increased from 116.8 to 140.8 kg. Both hematocrit and dry weight correlated with: (a) urea reduction ratio, (b) creatinine reduction ratio (CRR), and (c) KT/V urea. All correlations were negative. Stepwise regression showed that only hematocrit was an independent correlate of the CRR (CRR = 0.662 - 007* Hct, R2 = 0.770); whereas, both hematocrit (Hct) and weight (W) were independent correlates of KT/V urea (KT/V = 2.070 - 0.005*Hct - 0.009*W,R2 = 0.721). In addition to creatinine clearance, urea clearance through the dialyzer is reduced by a rising hematocrit. The effect of hematocrit on urea clearance is relatively small. Therefore, it requires large changes in hematocrit in order to be detected.

Little evidence for anti-endothelial-cell antibodies in microscopic polyarteritis and Wegener's granulomatosis.

Sera from patients with a vasculitis and controls were investigated for the presence of anti-endothelial cell antibodies(AECA), anti- neutrophil cytoplasmic antibodies(ANCA) and anti-myeloperoxidase (MPO) antibodies. Only 19% of patients with Wegener's granulomatosis and 2% of patients with microscopic polyarteritis had AECA. Our data suggests that AECA are a minor antibody system in vasculitis.