Flashcards in Lab 1: Resting CV Measurements Deck (18):
At what sites on the heart do we auscultate the primary heart sounds?
Base and apex
What does S1 correspond to?
Onset of systole; closing of the AV valves (mitral and tricuspid)
What does S2 correspond to?
End of systole; closing of the aortic and pulmonic valves
What are the primary heart sounds the result of?
Turbulence, or disruption of flow, downstream from the closing valves
What causes the pulsations you feel when you take a pulse?
A bolus of blood moving through the artery
To what pressure are you supposed to fully inflate the BP cuff?
At least 200 mmHg
At what rate should you let the BP cuff drain?
2-3 mmHg per sec
What is the first Korotkoff sound? What does this indicate?
The first consecutive taps heard indicate the SBP
What is the fifth Korotkoff sound? What does it indicate?
The disappearance of the taps indicates the DBP.
What is systolic BP?
Peak pressure experienced by the arterial wall
What is diastolic BP?
Basal pressure experienced by the arterial wall
What are some common errors when measuring BP?
Tucking the stethoscope under the cuff, placing it in the middle of the antecubital fossa or below the elbow, under inflating the cuff, releasing the pressure too slowly or too quickly, allowing the subject to hold their arm out during measurement
Equation for MAP
MAP = DBP + 1/3 PP
Equation for Pulse Pressure
PP = SBP - DBP
Equation for MAP during exercise
MAP(exercise) = DBP + 1/2 PP
Equation for Rate-Pressure Product
RPP = SBP x HR
What is RPP a measure of?
Amount of work/stress experienced by the heart