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21 Cards in this Set

  • Front
  • Back
When does SYSTOLE begin on an EKG?
R wave
When does SYSTOLE end on an EKG?
Late T wave
When does DIASTOLE begin on an EKG?
Late T wave
When does DIASTOLE end on an EKG?
R wave
What mechanical event does the R wave correspond to?
Closure of AV valves
What mechanical event does the ST junction correspond to?
Opening of AO valve
What mechanical event does the last quarter of the T wave correspond to?
Closure of AO valve
What mechanical event does the end of the T wave correspond to?
Opening of AV valves
SYSTOLE begins with what mechanical event?
Closure of AV valves
SYSTOLE ends with what mechanical event?
Closure of AO valve
DIASTOLE begins with what mechanical event?
Closure of AO valve
DIASTOLE ends with what mechanical event?
Closure of AV valves
What is the period between the R wave and the ST Junction called?
Isovolumic Contraction
What is the period between late in the T wave and the end of the T wave called?
Isovolumic Relaxation
Which heart sound is normally heard during isovolumic contraction?
First
Which heart sound is normally heard during isovolumic relaxation?
Second
1st phase of cardiac cycle:
- AV valves are open
- Semilunar valves are closed
- Slight increase in atrial pressure (due to contraction)
- Slight increase in ventricular pressure (due to filling)
- Decrease in atrial volume (due to ejection)
- Increase in ventricular volume (due to filling) until max is reached
Atrial Contraction
2nd phase of cardiac cycle:
- All valves are closed
- Increase in ventricular pressures (due to contraction, abruptly opening aortic and pulmonic valves - 1st sound)
- High, constant ventricular volumes (until ejection occurs)
Isovolumic Contraction
3rd phase of cardiac cycle:
- AV valves are closed
- Increasing ventricular pressures (due to contraction) exceed the aortic & pulmonary pressures
- Semilunar valves open
- Decreasing ventricular pressure & volume (due to ejection)
EKG: ST Junction - early in T
Rapid Ejection
4th phase of cardiac cycle:
- AV valves are closed
- Semilunar valves are open
- Ventricular repolarization leads decreases contraction & rate of ejection
- Decreasing ventricular pressure (kinetic flow continues)
- Increasing atrial pressures (due to continued filling)
- EKG: early in T - late in T
Reduced Ejection
5th phase of cardiac cycle:
- All valves are closed
- Decreasing ventricular pressures (abrupt closure of aortic and pulmonic valves -2nd sound)
- Increasing pressures due to continuous inflow
- Low, constant ventricular volumes
Isovolumic Relaxation