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Abdominal blood flow changes during acceleration stress in anesthetized dogs



Abdominal blood flow changes during acceleration stress in anesthetized dogs



Aerospace Medicine 39(2): 115-119



The changes in abdominal blood flow during acceleration stress were measured by a H2 electrode technique in 9 anesthetized dogs. The electrodes were implanted in the renal cortex, adrenal gland, and the small intestine. Measurements of tissue blood flow, heart rate, and mean arterial pressure were made at levels of acceleration up to +12GX in the supine position. The position of the animal was changed in 10[degree] increments toward the head-up position with 30[degree]-head-up tilt being the maximum tilt used. The above measurements were repeated at each G level until no discernible tissue flow could be measured. The tissue blood flow remained within normal limits up to 6 or 8 +GX in the supine and 10[degree] -head-up positions, but was significantly reduced above these G levels. In the 20[degree]- and 30[degree]-head-up positions a more rapid decline in tissue flow occurred. The changes in mean arterial pressure and heart rate were recorded. In other investigations the magnitude of the +Gz vector during acceleration stress determined the point of deterioration of cardiovascular function, but at high +GX accelerations, deterioration of cardiovascular function was also observed.

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Accession: 029835339

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PMID: 5645391


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