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Vol. 83, Issue 6, 1862-1866, December 1997
Danish Aerospace Medical Centre of Research and Clinic of Aviation Medicine, Rigshospitalet 7522, DK-2200 Copenhagen, Denmark
Received 23 January 1997; accepted in final form 11 August 1997.
Videbaek, Regitze, and Peter Norsk. Atrial
distension in humans during microgravity induced by parabolic flights.
J. Appl. Physiol. 83(6):
1862-1866, 1997.
The hypothesis was tested that human cardiac
filling pressures increase and the left atrium is distended during 20-s
periods of microgravity (µG) created by parabolic flights, compared
with values of the 1-G supine position. Left atrial diameter
(n = 8, echocardiography) increased
significantly during µG from 26.8 ± 1.2 to 30.4 ± 0.7 mm
(P < 0.05). Simultaneously, central
venous pressure (CVP; n = 6, transducer-tipped catheter) decreased from 5.8 ± 1.5 to 4.5 ± 1.1 mmHg (P < 0.05), and esophageal pressure (EP; n = 6) decreased from
1.5 ± 1.6 to 
4.1 ± 1.7 mmHg (P < 0.05). Thus transmural CVP
(TCVP = CVP EP; n = 4)
increased during µG from 6.1 ± 3.2 to 10.4 ± 2.7 mmHg
(P < 0.05). It is concluded that
short periods of µG during parabolic flights induce an increase in
TCVP and left atrial diameter in humans, compared with the results
obtained in the 1-G horizontal supine position, despite a decrease in
CVP.
cardiac volume; central venous pressure; gravitation; spaceflight
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