There is a gravitational influence on pulmonary perfusion, including in the most dependent
lung, where perfusion is reduced, termed Zone 4. Studies using xenon‐133 show Zone 4 …

Prone posture increases cardiac output and improves pulmonary gas exchange. We
hypothesized that, in the supine posture, greater compression of dependent lung limits …

The main purpose of this study was to find out whether the dominant dorsal lung perfusion
while supine changes to a dominant ventral lung perfusion while prone. Regional …

Acute respiratory distress syndrome is characterized by alterations in the ventilation-
perfusion ratio. Present techniques for studying regional pulmonary perfusion are difficult to …

The gravitational gradient of intrapleural pressure is suggested to be less in prone posture
than supine. Thus the gravitational distribution of ventilation is expected to be more uniform …

We evaluated the effect of prone positioning on gas-transfer characteristics in normal human
subjects. Single-breath (SB) and rebreathing (RB) maneuvers were employed to assess …

Both in normal subjects exposed to hypergravity and in patients with acute respiratory
distress syndrome, there are increased hydrostatic pressure gradients down the lung. Also …

GLENNY, ROBB W., WAYNE JE LAMM, RICHARD K. AL-BERT, AND H. THUMA~
ROBERTSON. Grwityisaminordeterminant of pulmonary blood flow distribution. J. Appl …

In vivo radioactive tracer and microsphere studies have differing conclusions as to the
magnitude of the gravitational effect on the distribution of pulmonary blood flow. We …

We measured the cranio-caudal distribution (A/B) of slowly inspired gas (Vi) and of perfusion
(Q) at different lung volumes in 8 supine subjects. When supine closing capacity (CC) …