Nocturnal pulmonary artery pressure increased by a mean of 5.1 mm Hg systolic from daytime, and standing to lying increased it by 9.3 mm Hg systolic, showing posture alone does not determine it.
Observational (n=8)
Does pulmonary artery pressure exhibit diurnal variation in patients with chronic heart failure?
Pulmonary artery pressure exhibits significant diurnal and postural variation in patients with chronic heart failure, which must be accounted for when interpreting isolated measurements.
Variation in pulmonary artery pressure has important consequences for the interpretation of isolated pressure measurements in patients with chronic heart failure. To investigate the nature of diurnal variation in pulmonary artery pressure in chronic heart failure, eight angina-free men (aged 50-72 years) with treated chronic heart failure caused by ischaemic heart disease underwent continuous ambulatory pulmonary artery pressure recording by a transducer tipped catheter. The mean (1 SD) daytime pulmonary artery pressure was 29.6 (5.0) mm Hg systolic and 13.7 (5.6) mm Hg diastolic. The mean change in pressure from day to night was +5.1 (3.2) mm Hg systolic and +3.8 (1.7) mm Hg diastolic; and the mean change from standing to lying +9.3 (2.3) mm Hg systolic and +6.4 (2.1) mm Hg diastolic. In six of the eight patients there was considerable rise in pulmonary artery pressure at night, but in the two patients with the most severe symptoms there was no nocturnal rise. In patients with chronic heart failure, nocturnal pulmonary artery pressure is not determined by postural change alone. But interpretation of isolated pulmonary artery pressure measurements must take the posture of the patient into account.
Gibbs et al. (Sat,) conducted a observational in chronic heart failure (n=8). Diurnal variation and postural change vs. Daytime and standing positions was evaluated on Change in pulmonary artery pressure. Nocturnal pulmonary artery pressure increased by a mean of 5.1 mm Hg systolic from daytime, and standing to lying increased it by 9.3 mm Hg systolic, showing posture alone does not determine it.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: