Impaired nocturnal melatonin secretion in non-dipper hypertensive patients

BACKGROUND: Melatonin plays a role in the biologic regulation of circadian rhythms, including sleep. Melatonin has also been shown to modulate vascular smooth muscle tone and to induce hemodynamic effects in humans. OBJECTIVE: To evaluate whether melatonin plays a role in the circadian rhythm of blood pressure in hypertensive patients. METHODS: Sixteen elderly patients with essential hypertension were evaluated. Patients were defined as either dippers (DIP, n = 8) or non-dippers (NDIP, n = 8) according to the nocturnal change in the mean arterial pressure (MAP). 6-Sulfatoxymelatonin (6-SMT), the main melatonin metabolite, was determined by enzyme-linked immunosorbent assay (ELISA) in two separate urine collections, one in the daytime and one during the night. RESULTS: Both groups of DIP and NDIP hypertensives were comparable in regard to age and sex. During the night, the mean arterial pressure decreased by 10.3 +/- 2.2% in the DIP and increased by 7.5 +/- 1.7% in the NDIP group (p < 0.01). Daily 6-SMT was comparable in DIP (3.28 +/- 0.87 microg/12 h) and NDIP (2.31 +/- 0.68 microg/12 h) (p = 0.39). However, while the DIP presented the physiological nocturnal increase in urinary 6-SMT (mean 8.19 +/- 1.68 microg/ 12 h), this surge of melatonin production was missing in NDIP in whom nocturnal urinary 6-SMT concentrations were not significantly different from daily levels (mean 2.56 +/- 0.79 microg/12 h). The nocturnal change in urinary 6-SMT excretion was positively correlated to the nocturnal change in MAP (R = 0.54; p = 0.031). CONCLUSIONS: NDIP hypertensive patients differ from DIP hypertensives by having an impaired nocturnal melatonin secretion. Thus, melatonin may play a role in the circadian rhythm of blood pressure in hypertensive patients.     

Coronary stent bacterial infection with multiple organ septic emboli

We describe an 80-year-old patient who developed Staphylococcus aureus septicemia several days after the implantation of a double stent in the proximal and mid-left anterior descending artery. The infection was complicated by multiple abscesses in the lungs and liver, as well as by bilateral bacterial endophthalmitis requiring right vitrectomy. Long-term antibiotic treatment was successful. Rarity notwithstanding, heightened awareness of this potential complication of a common cardiac procedure is important since diagnosis and immediate therapy are mandatory.     

Statin Therapy for Primary Prevention in the Elderly and Its Association with New-Onset Diabetes,Cardiovascular Events,and All-Cause Mortality

PurposeThis study assessed associations of the use of statins for primary prevention with cardiovascular outcomes among adults ages ≥70 years.MethodsIn a retrospective population-based cohort study, new users of statins without cardiovascular disease or diabetes mellitus were stratified by ages ≥70 years and <70 years. Using a time-dependent approach, adherence to statins was evaluated according to the proportion of days covered: <25%, 25%-50%, 50%-75%, and ≥75%. We assessed associations of statin therapy with increased risk of new-onset diabetes mellitus and with decreased risks of major adverse cardiovascular events and all-cause mortality.ResultsOf 42,767 new users of statins, 5970 (14%) were ages ≥70 years. The incident rates of major adverse cardiovascular events, all-cause mortality, and new-onset diabetes mellitus in the highest to lowest proportion of days covered categories were 16.9%, 16.7%, and 9.4% and 6.3%, 1.7%, and 9.4%, respectively. For the older group, the adjusted hazard ratios of major adverse cardiovascular events and mortality were significantly decreased for the highest adherence group (proportion of days covered ≥75%): 0.71 (0.57-0.88) and 0.68 (0.54-0.84), respectively. The respective hazard ratios were less favorable for the younger group: 0.80 (0.68-0.93) and 0.74 (0.58-1.03). The risk of new-onset diabetes mellitus was increased for the younger but not the older group.ConclusionsStatin use for primary prevention was associated with cardiovascular benefit in adults ages ≥70 years without a significant risk for the development of diabetes. These data may support the use of statin therapy for primary prevention in the elderly.     

The use of insulin detemir during pregnancy: a safety evaluation

Introduction: Diabetes during pregnancy causes both fetal and maternal complications. Insulin is the most effective pharmacological treatment for controlling hyperglycemia during gestation and can limit adverse outcomes. Insulin detemir (IDet), a novel basal insulin, has already been used for this indication for several years. It was reclassified in 2012 by the FDA from category C to category B for the treatment of pregnant women with diabetes.

Areas covered: This article reviews published data regarding the use of IDet during pregnancy. We discuss pharmacokinetic and pharmacodynamic qualities of IDet and potential advantages for its use during pregnancy.

Expert opinion: IDet is a viable option for the management of diabetes during pregnancy. Though data is limited, its safety and efficacy is probably comparable to human insulin, and in some aspects superior to it. More data, specifically for IDet in pregnancies complicated by gestational diabetes (GDM) or type 2 diabetes, is needed.     

Ogilvie's syndrome

We reviewed the clinical presentation, management, and outcome of 25 patients with Ogilvie's syndrome (acute colonic pseudoobstruction) at Memorial Sloan-Kettering Cancer Center from 1982 through 1985. All patients had cancer and severe associated medical problems. Abdominal x-rays uniformly showed cecal distension ranging between 9 and 18 cm. Twenty-four of the 25 patients were treated with conservative nonendoscopic management. One patient had an exploratory laparotomy for prophylactic cecostomy after only one day of conservative therapy. Of the 24 patients treated conservatively, 23 (96%) improved by both clinical and radiologic criteria in a mean of 3.0 days. The remaining patient died of multisystem failure not related to the acute colonic pseudoobstruction. Colonoscopic decompression was not attempted in any of the 25 patients. There were no colonic perforations, and there were no pseudoobstruction-related deaths. This study questions the need for early endoscopic or surgical treatment in cancer patients with acute colonic pseudoobstruction.     

A novel de novo heterozygous pathogenic variant in the SDHA gene results in childhood onset bilateral optic atrophy and cognitive impairment

Metabolic Brain Disease - Isolated defects in the mitochondrial respiratory chain complex II (CII; succinate-ubiquinone oxidoreductase) are extremely rare and mainly result from bi-allelic...