passed out - paganini

[ArchivalUser]

You are watching an ill-tempered child that threatens to hold her breath until her wishes are fulfilled. You say "go ahead" whereupon the child takes a deep breath, holds it, and stares back at you defiantly. The child is incredibly willful, and to your alarm, she passes out in front of you. You rush to the child and discover that

a. her heart rate is low and her pulses are weak, from lack of oxygen
b. her heart rate is fast and her pulses are bounding, from baroreceptor-mediated sympathetic activation
c. her heart rate is normal because the baroreceptors kept her blood pressure up the whole time
d. none of the above

[ArchivalUser]

bbb

[ArchivalUser]

b. her heart rate is fast and her pulses are bounding, from baroreceptor-mediated sympathetic activation

[ArchivalUser]

can you please explain the concept?

[ArchivalUser]

valsalva' s maneuver?

[ArchivalUser]

in Valsalva you block the return of the blood to the heart, so decreased CO, decreased blood pressure is sensed by the baroreceptors and lead to incr HR

[ArchivalUser]

b is correct

[ArchivalUser]

i thought that in valsalva- blood is being pumped from the pulmonary to the systemic circulatioon...so is that also the reason for the raise in heart rate?
Please give me input..