Chest
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Randomized Controlled Trial
Randomized trial on the effects of high-dose zopiclone on OSA severity, upper airway physiology and alertness.
Studies indicate that standard doses of hypnotics reduce or do not change the apnea-hypopnea index (AHI) or pharyngeal muscle activity. A 1-month trial of nightly zopiclone (7.5 mg) modestly reduced the AHI vs baseline without changing other sleep parameters or next-day sleepiness. ⋯ A single night of treatment with high-dose zopiclone does not systematically reduce the AHI or increase the arousal threshold in selected people with OSA. The mechanisms for these unexpected findings require further investigation.
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A higher incidence of Arnold nerve reflex (ANR) has been observed in patients with chronic cough. However, the different ANR response in various causes of chronic cough remains unclear. Furthermore, it is unknown whether ANR will change after effective treatment. ⋯ A positive ANR appears to be a sign of vagal hypersensitivity and can be reversed after effective treatment of chronic cough. However, although various causes of chronic cough share a similar feature of an elevated ANR response in a minority of patients, there appears to be limited usefulness in assessing ANR because it does not appear to be a valid predictor of etiology of chronic cough or outcome of treatment.
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Case Reports
Treatment with convalescent plasma for critically ill patients with SARS-CoV-2 infection.
As of March 24, 2020, novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been responsible for 379,661 infection cases with 16,428 deaths globally, and the number is still increasing rapidly. Herein, we present four critically ill patients with SARS-CoV-2 infection who received supportive care and convalescent plasma. Although all four patients (including a pregnant woman) recovered from SARS-CoV-2 infection eventually, randomized trials are needed to eliminate the effect of other treatments and investigate the safety and efficacy of convalescent plasma therapy.
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Case-control studies are one of the major observational study designs for performing clinical research. The advantages of these study designs over other study designs are that they are relatively quick to perform, economical, and easy to design and implement. ⋯ Study design considerations are reviewed, including sample size, power, and measures associated with risk factors for clinical outcomes. Finally, we discuss the advantages and disadvantages of case-control studies and provide a checklist for authors and a framework of considerations to guide reviewers' comments.