Cardiac Cycle and Heart Sounds

These flashcards cover concepts related to the cardiac cycle, specifically focusing on the Wiggers diagram and heart sound phases.

Wiggers Diagram

Represents the relationship between various phases of the cardiac cycle and corresponding heart sounds.

Atrial Contraction

Phase represented by 'a' in the Wiggers diagram.

AV Valve Closure

Represents the first heart sound S1.

Ventricular Contraction

Denoted by the QRS complex in the Wiggers diagram.

Semilunar Valves Open

Phase represented by 'c' in the Wiggers diagram.

Ejection of Blood from Ventricles

Denoted by 'd' in the Wiggers diagram.

Semilunar Valve Closure

Represents the second heart sound S2 and is represented by 'e' in the Wiggers diagram.

Isovolumic Contraction

The phase occurring between 'b' (AV valves closure) and 'c' (semilunar valves open).

Isovolumic Relaxation

The phase occurring between 'e' (semilunar valve closure) and 'f' (opening of AV valves).

End Diastole

Marked at Q on the QRS complex.

End Systole

Marked at the end of the T wave.

Diastasis

The middle stage of diastole where ventricular filling slows before atrial contraction occurs.