Change in type of sleep-disordered breathing from predominant central to obstructive sleep apnea following coronary artery bypass grafting

We report the case of a 67-year-old overweight man with reduced left ventricular ejection fraction (LVEF) due to myocardial infarction. He had an implantable cardioverter defibrillator (ICD) for frequent episodes of ventricular tachyarrhythmia and was initiated into adaptive-servo ventilation therapy for severe central sleep apnea (CSA), which was not suppressed by continuous positive airway pressure (CPAP). Since he still had several episodes of appropriate ICD therapies, coronary angiogram was performed, and severe three-vessel disease was found. He then underwent coronary artery bypass grafting (CABG). After CABG, his LVEF did not improve (from 29 to 25%); however, the B-type natriuretic peptide level decreased (from 560 to 330 pg/mL). Although the apnea-hypopnea index did not change (49.4 before and 55.1/h after CABG), his CSA converted to predominant obstructive sleep apnea accompanied by a shortening of the lung-to-finger circulation time (from 43 to 29 s) 2 weeks after CABG, which was completely suppressed by CPAP. <Learning objective: Central sleep apnea (CSA) can be alleviated by treatments for heart failure. However, limited data are available regarding resolution of CSA after coronary revascularization. We describe a case whose predominant CSA converted to obstructive sleep apnea after surgical coronary revascularization without any improvements in systolic function. Coronary revascularization can alleviate CSA possibly through altering congestive status and may unmask obstructive phenotype in patients with severe coronary artery disease.>.

Successful Treatment of Congestive Heart Failure Due to Severe Aortic Valve Stenosis With Low Dose Tolvaptan in Elderly Patients

Medical therapy for severe aortic valve stenosis (AS) is necessary for inoperable patients due to comorbid conditions. Tolvaptan (TLV), unlike other diuretics, resulted in modest changes in filling pressures associated with an increase in urine output, suggesting that TLV improves congestive heart failure (CHF) due to severe AS without hemodynamic instability.We retrospectively investigated 14 consecutive patients ≥ 80 years of age admitted due to decompensated CHF with severe AS at Juntendo University Hospital from April 2014 to November 2015. Seven of the 14 patients were treated with TLV. We examined the safety and efficacy of TLV treatment for severe AS.Mean age was 90.0 ± 6.3 years and mean aortic valve area was 0.57 ± 0.22 cm². Urine volume at day 1 of TLV treatment was increased and urine osmolality significantly decreased at day 1 of TLV treatment (all P < 0.05). New York Heart Association classification and brain natriuretic peptide levels significantly improved 1 week after treatment and at discharge (all P < 0.05) whereas brain natriuretic peptide levels did not improve in the patients without TLV. Severe adverse events did not occur during TLV treatment. During the first 3 days, blood pressure and heart rate were relatively stable. TLV treatment did not affect serum creatinine, blood urea nitrogen, or the estimated glomerular filtration rate.In elderly patients with severe AS, TLV treatment improved CHF without hemodynamic instability. Further prospective studies are needed to assess the safety and efficacy of TLV in decompensated heart failure due to severe AS.

Impact on Clinical Outcomes of Periodic Leg Movements During Sleep in Hospitalized Patients Following Acute Decompensated Heart Failure

BACKGROUND

Periodic leg movements during sleep (PLM) are characterized by regularly recurring movement of the legs during sleep. Although PLM is common and a predictor of death in patients with chronic heart failure, the clinical significance of PLM in hospitalized patients with a reduced left ventricular ejection fraction (LVEF) following acute decompensated heart failure (ADHF) remains unknown.Methods and Results:After initial improvement of acute signs and symptoms of ADHF, 94 consecutive patients with reduced LVEF who underwent polysomnography were enrolled. They were divided into 2 groups based on the presence or absence of severe PLM defined as PLM index ≥30. The risks for clinical events, composite of all-cause death and rehospitalization, were assessed using a stepwise multivariable Cox proportional model including variables showing P<0.10 in univariate analyses. Severe PLM was observed in 21 patients (22%). At a median follow-up of 5.2 months, 30 patients experienced clinical events (32%). In the multivariable analysis, the presence of severe PLM was significantly associated with increasing clinical events (hazard ratio, 2.16; 95% confidence interval, 1.03-4.54; P=0.042) independent of hemoglobin level and the severity of sleep-disordered breathing.

CONCLUSIONS

In hospitalized patients with systolic dysfunction following ADHF, severe PLM was prevalent and significantly associated with increased risk of death and/or rehospitalization.

Low circulating coenzyme Q10 during acute phase is associated with inflammation, malnutrition, and in-hospital mortality in patients admitted to the coronary care unit

Coenzyme Q10 (CoQ10) has a potential role in the prevention and treatment of heart failure through improved cellular bioenergetics. In addition, it has antioxidant, free radical scavenging, and vasodilatory effects that may be beneficial. Although critical illness in intensive care unit is associated with decreased circulating CoQ10 levels, the clinical significance of CoQ10 levels during acute phase in the patients of cardiovascular disease remains unclear. We enrolled 257 consecutive cardiovascular patients admitted to the coronary care unit (CCU). Serum CoQ10 levels were measured after an overnight fast within 24 h of admission. We examined the comparison of serum CoQ10 levels between survivors and in-hospital mortalities in patients with cardiovascular disease. Serum CoQ10 levels during the acute phase in patients admitted to the CCU had similar independent of the diagnosis. CoQ10 levels were significantly lower in patients with in-hospital mortalities than in survivors (0.43 ± 0.19 vs. 0.55 ± 0.35 mg/L, P = 0.04). In patients admitted to the CCU, CoQ10 levels were negatively associated with age and C-reactive protein levels, and positively associated with body mass index, total cholesterol, and high-density lipoprotein cholesterol levels. Low CoQ10 levels correlated with low diastolic blood pressure. Multivariate logistic regression analysis demonstrated that low CoQ10 levels were an independent predictor of in-hospital mortality. Low serum CoQ10 levels during acute phase are significantly associated with cardiovascular risk and in-hospital mortality in patients admitted to the CCU.

Bisphenol a Inhibits Testicular Functions and Increases Luteinizing Hormone Secretion in Adult Male Rats

Effects of a xenoblotic estrogen, bisphenol A (BPA), on reproductive functions were investigated using adult male rats. BPA was dissolved into sesame oil and injected sc every day (1 mg/rat) for 14 days. Animals were killed by decapitation after the final administration of BPA, and the trunk blood, pituitary, and testes were collected. Plasma concentrations of prolactin were dramatically Increased and pituitary contents of prolactin were slightly increased in the BPA group compared to the control group. Plasma concentrations of testosterone were decreased and plasma concentrations of LH were increased in BPA-treated rats compared to control rats. Testicular contents of inhibin were decreased in BPA-treated rats compared to control rats, although plasma concentrations of inhibin were not changed after administration of BPA. The testicular response to hCG for progesterone and testosterone release was decreased in BPA-treated rats. Administration of BPA did not change the pituitary response to luteinizing hormone-releasing hormone (LH-RH) in castrated male rats treated with testosterone. Male sexual behavior also was not changed as a result of BPA treatment. These results suggest that BPA directly inhibits testicular functions and the increased level of plasma LH is probably due to a reduction in the negative feedback regulation by testosterone. The testis is probably a more sensitive site for BPA action than the hypothalamus–pitultary axis.

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Erratum to: 36th International Symposium on Intensive Care and Emergency Medicine: Brussels, Belgium. 15-18 March 2016

[This corrects the article DOI: 10.1186/s13054-016-1208-6.].

Positive airway pressure therapy for heart failure

Heart failure (HF) is a life-threatening disease and is a growing public health concern. Despite recent advances in pharmacological management for HF, the morbidity and mortality from HF remain high. Therefore, non-pharmacological approaches for HF are being developed. However, most non-pharmacological approaches are invasive, have limited indication and are considered only for advanced HF. Accordingly, the development of less invasive, non-pharmacological approaches that improve outcomes for patients with HF is important. One such approach may include positive airway pressure (PAP) therapy. In this review, the role of PAP therapy applied through mask interfaces in the wide spectrum of HF care is discussed.

Valproic acid enhances the effect of bone marrow-derived mononuclear cells in a rat ischemic stroke model

Bone marrow derived mononuclear cell (MNC) transplantation is a potential therapy for ischemic stroke. Here, we hypothesized that valproic acid (VPA) would modulate transplantation effects of MNCs in a rat ischemic stroke model. Male Sprague-Dawley rats were subjected to transient 90min middle cerebral artery occlusion. Infarct volume, neurological outcome, and immunohistological assessments were performed 7 days after ischemia. MNCs injected 6 or 24h but not 48 or 72h after ischemia significantly reduced infarct volume and improved neurological deficits. We then tested whether the therapeutic window of MNC transplantation could be expanded through combination therapy with VPA. MNC transplantation at 48h combined with VPA injection three times at 47, 53, and 72h after ischemia significantly ameliorated infarct volume and neurological deficits compared to a vehicle group. Combination therapy reduced the number of myeloperoxidase-positive cells, ionized calcium binding adapter molecule 1-positive cells, tumor necrosis factor-α-positive cells, and von Willebrand factor-positive cells in the ischemic boundary zone. The number of engrafted MNCs that were fluorescently labeled with PKH 26, on day 7, was significantly higher after combination therapy than after that MNC transplantation alone. Our results demonstrated that combination therapy with VPA enhanced the anti-inflammatory and vasculo-protective effects against endothelial damage following ischemia, and increased the survival of transplanted cells, leading to expansion of the therapeutic time window for MNC transplantation. Together, these findings suggest that VPA may be an appropriate partner for cell-based treatment of ischemic stroke.