Key result
Sitting in a chair position minimizes severe carotid blood flow shifts during the Valsalva maneuver.
Why the study?
The intensity of hemodynamic shifts in carotid artery blood flow velocity during the Valsalva maneuver may be affected by body position, which has implications for aneurysm rupture and rebleeding risk.
Does body position modify carotid artery blood flow velocity during straining in healthy adults?
Cross-Sectional (n=141)
Does body position modify carotid artery blood flow velocity during straining in healthy adults?
Answers are grounded in this paper and cite their sources.
The chair position minimizes severe shifts in carotid artery blood flow velocity during straining and may be used therapeutically.
The Valsalva maneuver (VM) produces rapid shifts in cerebrovascular blood flow and is often implicated in aneurysm rupture and rebleeding. To determine whether intensity of hemodynamic shifts is affected by position, we examined effects of five body positions (chair, 70 degrees and 30 degrees upright, flat, side) on carotid artery blood flow velocity (CABFV) across the VM in 141 healthy adults (30-55 yrs.). Subjects strained at 40 mmHg pressure for 10 seconds. CABFV was measured continuously by ultrasonic Doppler technique. During straining, position significantly (F = 13.7; p less than .0001) affected CABFV. Less reduction occurred in the chair (p less than .05) position than in any of the others. The 70 degrees position produced less fall in CABFV (p less than .05) than did the 30 degrees, flat and side positions. Less increase in CABFV across the VM was recorded in the chair position (p less than .05) than in any of the others. It is concluded that the chair position can be used therapeutically to reduce severe shifts of CABFV associated with straining.
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Barbara A. Therrien (1990) conducted a cross-sectional in Healthy adults (n=141). Body position (chair, 70 degrees and 30 degrees upright, flat, side) vs. Comparison between positions was evaluated on Carotid artery blood flow velocity (CABFV) (p=<0.0001). The chair position reduced severe shifts in carotid artery blood flow velocity during the Valsalva maneuver compared to other body positions.
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