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Journal of Applied Physiology, Vol 81, Issue 1 19-25, Copyright © 1996 by American Physiological Society
ARTICLES |
J. C. Buckey Jr, F. A. Gaffney, L. D. Lane, B. D. Levine, D. E. Watenpaugh, S. J. Wright, C. W. Yancy Jr, D. M. Meyer and C. G. Blomqvist
Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas 75235-9034, USA.
Gravity affects cardiac filling pressure and intravascular fluid distribution significantly. A major central fluid shift occurs when all hydrostatic gradients are abolished on entry into microgravity (microG). Understanding the dynamics of this shift requires continuous monitoring of cardiac filling pressure; central venous pressure (CVP) measurement is the only feasible means of accomplishing this. We directly measured CVP in three subjects: one aboard the Spacelab Life Sciences-1 space shuttle flight and two aboard the Spacelab Life Sciences-2 space shuttle flight. Continuous CVP measurements, with a 4-Fr catheter, began 4 h before launch and continued into microG. Mean CVP was 8.4 cmH2O seated before flight, 15.0 cmH2O in the supine legs-elevated posture in the shuttle, and 2.5 cmH2O after 10 min in microG. Although CVP decreased, the left ventricular end-diastolic dimension measured by echocardiography increased from a mean of 4.60 cm supine preflight to 4.97 cm within 48 h in microG. These data are consistent with increased cardiac filling early in microG despite a fall in CVP, suggesting that the relationship between CVP and actual transmural left ventricular filling pressure is altered in microG.
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