Epidemiology of dialysis patients and heart failure patients

The epidemiology of maintenance dialysis patients and heart failure patients has striking similarities. Both groups have a high prevalence of comorbid conditions, a high hospitalization rate, a low self-reported quality of life, and an excessively high mortality risk, mostly because of cardiovascular causes. Observational studies in both dialysis and heart failure patients have indicated the lack of a significant association between the traditional cardiovascular risk factors and mortality, or the existence of a paradoxic or reverse association, in that obesity, hypercholesterolemia, and hypertension appear to confer survival advantages. The time discrepancy between the 2 sets of risk factors, that is, overnutrition (long-term killer) versus undernutrition (short-term killer) may explain the overwhelming role of malnutrition, inflammation, and cachexia in causing the reverse epidemiology, which may exist in more than 20 million Americans. We have reviewed the opposing views about the concept of reverse epidemiology in dialysis and heart failure patients, the recent Die Deutsche Diabetes Dialyze study findings, and the possible role of racial disparities. Contradictory findings on hyperhomocysteinemia in dialysis patients are reviewed in greater details as a possible example of publication bias. Additional findings related to intravenous iron and serum ferritin, calcium, and leptin levels in dialysis patients may enhance our understanding of the new paradigm. The association between obesity and increased death risk in kidney transplanted patients is reviewed as an example of the reversal of reverse epidemiology. Studying the epidemiology of dialysis patients as the archetypical population with such paradoxic associations may lead to the development of population-specific guidelines and treatment strategies beyond the current Framingham cardiovascular risk factor paradigm.     

Assessment of elective patients

This article outlines an approach to preoperative assessment of patients presenting for elective surgery. The main focus is on assessment of patients with cardiovascular disease undergoing non-cardiac surgery, with regard to risk assessment, preoperative investigations and perioperative management of cardiovascular medications. Assessment of patients with common respiratory diseases, including obstructive sleep apnoea, is also discussed. The current utility of cardiopulmonary exercise testing in risk assessment and perioperative care planning is summarized. Finally, use of brain natriuretic peptide as a biomarker in risk stratification is considered.     

Awareness of osteoporotic patients

Osteoporosis has recently been recognized as a major public health problem by some governments and health care providers. Despite significant progress in knowledge about osteoporosis, public awareness is required for effective management if precautions are to be taken. The aim of this study was to evaluate the educational status of osteoporotic individuals, and their awareness about the disease and sources of information. We also aimed to compare the variables between the geographical regions of the country, since significant differences exist in socioeconomic status and lifestyle within the same cultural context. This multicenter study was carried out in eight cities located in six different geographical regions between September 2001 and January 2002. To our knowledge, this is the first multicenter study in Turkey evaluating the relationship between awareness of osteoporotic patients and other variables such as educational level and economic factors. Ten centers took part in this study and consecutive patients with either femoral or lumbar T-scores below –2.5 SD were enrolled into the study group. Bone mineral density was measured using dual energy X-ray absorptiometry (DXA). Patients were interviewed using a questionnaire on past medical history, education, awareness about their disease and risk factors for osteoporosis. A total of 540 women (93.8%) and 36 men (6.3%) were included in the study. Fifty-four percent of patients declared that they were aware of osteoporosis. With regard to sources of information, 56.8% of patients reported physicians as the main source of information. Awareness of the patients was negatively correlated with age (P=0.025, r=–0,94) but positively correlated with education (P=0.0001, r=0.327), level of physical activity (P=0.001, r=143), calcium intake (P=0.005, r=119) and modern clothing style (P=0.0001, r=309). Educational status of the patients was negatively correlated with BMI (P=0.0001, r=–283) and positively correlated with physical activity (P=0.0001, r=268), modern clothing style (P=0.0001, r=600) and smoking (P=0.0001, r=273). Regional comparison of female patients demonstrated that significant differences exist in terms of educational status, clothing style, smoking, level of physical activity, calcium intake, and knowledge about osteoporosis. As a result, education has profound effects on awareness about osteoporosis and many aspects of human behavior, such as calcium intake, physical activity, clothing style and smoking. Significant disparities may be observed between the geographical regions of the same country.     

患者年龄和前列腺体积与PSA的关系

目的：探讨良性前列腺增生症（BPH）患者年龄和前列腺体积（PV）与血清前列腺特异抗原水平的关系。方法：采用放射免疫法测定66例BPH患者游离前列腺特异抗原（FPSA）、总前列腺特异抗原（TPSA）,计算出FPSA／TPSA比值,并测定切除的前列腺实际体积。结果：患者年龄、PV与FPSA、TPSA的相关系数分别为0.32、0.25、0.70和0.57,P均＜0.05,而与FPSA／TPSA的相关系数分别为－0.14、－0.10,P均＞0.05。结论：患者年龄、PV分别与FPSA、TPSA有正相关性,而与FPSA／TPSA无相关性。     

Outcome of patients in laparoscopic training courses compared to standard patients

Background & aimCurrent Laparoscopic simulators have limited usefulness and patients have been used for training since the dawn of surgery. NUGITS (Northumbrian Upper Gastro Intestinal Team of Surgeons) Laparoscopic Skills courses utilise hands-on experience with simulators moving to live operating on volunteer patients. It is vital to know that the volunteer patient is not disadvantaged by greater surgical risk.MethodsThis was a case-controlled prospective comparison of patients undergoing both Laparoscopic Cholecystectomy (LC) [n = 51] and Laparoscopic Inguinal Hernia (LIH) [n = 62] during NUGITS training courses. They are compared with a matched (age, sex and ASA grade) control group LC (n = 51) and LIH (n = 62) operated on by consultants. The outcome measures were surgical peri-and post-operative complications, post-operative hospital stay, readmission and early recurrence of inguinal hernia (<6 months).ResultsIn the LC cohort, there was no significant difference in the length of hospital stay (p = 0.07) or readmission (p = 0.16) in both the groups. The mean operating time was higher in the trainee compared to the control group (p = 0.001). There was no difference in the post-operative morbidity or mortality in either group. In LIH cohort, the mean operating time was higher in the trainee compared with the control group. There was no significant difference in post-operative complications (p > 0.05) and early post-operative recurrence of hernia (p > 0.05).ConclusionThe post-operative outcomes of patients undergoing laparoscopic surgery during laparoscopic training courses are similar to consultant-operated patients. Thus, it is acceptable and safe to encourage patients to volunteer for laparoscopic training courses.