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The acute effect of supplemental oxygen during exercise has been shown to differ largely among patients with COPD. It is unknown what factors influence oxygen response.

To examine the feasibility and diagnostic value of a novel prehospital chest ultrasound algorithm in patients with dyspnea.

Breath-to-breath variability is not purely random but is, instead, characterized by correlations on short- and long-term scales. Short-term correlations might reflect intact metabolic-control mechanisms. To investigate whether the higher variability of breathing during rapid eye movement (REM) compared to non-REM (NREM) sleep is of random or nonrandom nature--reflecting an altered respiratory control--short-term and long-term correlations of respiratory drive and timing were determined.

The creation of a calibrated iliofemoral arteriovenous fistula (AVF) increases functional exercise capacity in patients with severe COPD. We assessed the effect of AVF on blood pressure (BP) in end-stage COPD patients with hypertension one-year post-procedure.