CARDIOVASCULAR RESPONSES TO POSITIVE PRESSURE BREATHING USING THE TACTICAL LIFE SUPPORT SYSTEM

Authors
  1. Goodman, L.S.
  2. Fraser, W.D.
  3. Eastman, D.E.
  4. Ackles, K.N.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
The improved protection afforded by the Tactical Life Support System (TLSS) vs. older garmentry has not been reported with respect to the cardiovascular effects of positive pressure breathing (PPB). Nine subjects wearing TLSS were exposed to 30, 50 and 70 mmHg PPB in order, separated by 4 minutes rest and preceded by a 1 min. control period. Stroke and Cardiac volumes (SV, CO) were determined by impedance cardiography. G-suit inflation was 4 x mask/jerkin pressure. Data were analyzed with an ANOVA RM design. HR, SV and CO were unaffected after 4 min. of 30 and 50 mmHg PPB. HR was unaffected after 4 min. at 70 mmHG PPB. TPR increased by 20% at min. 3 and 4 of 30 mmHg PPB, and by 34% and 39% throughout the 50 and 70 mmHg PPB levels, respectively (P < .05). MAP was directly related to PPB level, increasing by 23%, 32% and 47% for each PPB level, respectively (P < .01). TRUNCATED
Report Number
DCIEM-91-39 — Reprint
Date of publication
15 Feb 1992
Number of Pages
8
Reprinted from
Aviation Space and Environmental Medicine, vol 63, 1992, p 662-669
DSTKIM No
92-03584
CANDIS No
126945
Format(s):
Hardcopy;Originator's fiche received by DSIS

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