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1 Department of Integrative Physiology, and Cardiovascular Research Institute, University of North Texas Health Science Center, Fort Worth, Texas 76107; 2 Copenhagen Muscle Research Center, Department of Anesthesia, Rigshospitalet, University of Copenhagen, DK-2100 Copenhagen 0, Denmark
Transmission characteristics of pneumatic pressure
to the carotid sinus were evaluated in 19 subjects at rest and during exercise. Either a percutaneous fluid-filled (n = 12)
or balloon-tipped catheter (n = 7) was placed at the
carotid bifurcation to record internal transmission of external neck
pressure/neck suction (NP/NS). Sustained, 5-s pulses, and rapid ramping
pulse protocols (+40 to 
80 Torr) were recorded. Transmission of
pressure stimuli was less with the fluid-filled catheter compared with
that of the balloon-tipped catheter (65% vs. 82% negative pressure,
83% vs. 89% positive pressure; P < 0.05). Anatomical
location of the carotid sinus averaged 3.2 cm (left) and 3.6 cm (right)
from the gonion of the mandible with a range of 0-7.5 cm.
Transmission was not altered by exercise or Valsalva maneuver, but did
vary depending on the position of the carotid sinus locus beneath the
sealed chamber. These data indicate that transmission of external NP/NS was higher than previously recorded in humans, and anatomical variation
of carotid sinus location and equipment design can affect transmission results.
carotid baroreflex; chamber pressure; tissue pressure
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