Effect of barometric pressure on single-breath carbon monoxide diffusing capacity.

Background: Single-breath diffusing capacity for carbon monoxide (D) quantifies gas transfer in the lungs. D measurement is affected by barometric pressure (Pb) and alveolar partial pressure of oxygen (PAO). The current equations for adjusting D for Pb and PAO may not be accurate given advances in test performance and technology.

Variability in Cardiopulmonary Exercise Testing Biologic Controls.

Background: Cardiopulmonary exercise testing is an increasingly common test and is considered the accepted standard for assessing exercise capacity. Quantifying variability is important to assess the instrument for quality control purposes. Though guidelines recommend biologic control testing, there are minimal data on how to do it.

Impact of obesity on pulmonary function: current understanding and knowledge gaps.

Purpose Of Review: Obesity is an increasing world-wide public health concern. Obesity both causes respiratory symptoms and contributes to many cardiorespiratory diseases. The effects of obesity on commonly used lung function tests are reviewed.