cardiac cycle Flashcards
1
Q
cardiac cycle
A
- cycle of one heartbeat to the next and all associated events taking place
- entire heart relaxation to contraction
2
Q
how are heart rate and cardiac cycle related?
A
inverse of one another
3
Q
how do you calculate cardiac cycle from heart rate
A
HR =75
CC = 60 sec/75 beats = .8 sec/beat
4
Q
what events occur during ventricular systole
A
- isovolumic contraction
- rapid ejection
- reduced ejaction
5
Q
what events occur during ventricular diastole
A
- atrial systole
- reduced filling
- rapid filling
- isovolumic relaxation
6
Q
(look at slides 9)
During atrial systole, atrial contraction does what? what wave is this?
A
- it increases the pressure as it pushes against the large volume
- pressure in atria declines as the blood moves into the ventricle
- once atrial pressure drops below ventricular pressure, the MV and TV close
- A wave
7
Q
when does isovolumic contraction occur?
A
-when MV/TV close and all valves are closed
8
Q
what’s the C wave?
A
- when the ventricles begin to contract and cause a bunching up of the septum and the apex comes up to make the AV valves bulge up and causes pressure in the atria to increase
- pressure is decreased once the rest of the heart depolarizes and there is an overall lengthening of the tissue
9
Q
the downslope after C… what causes it?
A
-the depolarization of the rest of the heart and the tissue of the heart is lengthening
10
Q
V wave?
A
- while ventricle is contracting and ejecting, the atria are passively filling again = increase in pressure
- AV valve still closed… but then opens and is marked by a sudden decrease in pressure in the atria as the blood dumps into the ventricle
- sudden drop is the v wave
- once atrial pressure exceeds vent. pressure, the MV opens (tv on right side)
11
Q
what can be used to assess waveforms on the patient
A
right internal jugular
