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22 terms

WIGGERS DIAGRAM

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Wigger's diagram labels: A
Atrial contraction
Wigger's diagram labels: B
MV and TV closure (1st heart sound, also ventricular contraction QRS)
Wigger's diagram labels: C
AOV opens
Wigger's diagram labels: D
Ejection of blood from ventricles
Wigger's diagram labels: E
AOV closure and 2nd heart sound
Wigger's diagram labels: F
Opening of AV valves (TV & MV)
Wigger's diagram labels: B to C
Isovolumic contraction
Wigger's diagram labels: E to F
Isovolumic relaxation
Define diastasis.
Middle stage of diastole during cycle of heart beat, where initial passive filling of the heart's ventricles has slowed down, but before the atria contract to complete the filling
What is the Wigger's diagram good for showing?
That the electrical activity (recorded on an EKG) actually occurs well before mechanical contraction of atria and ventricles
Atrial contraction begins where on EKG? and continues to where?
Begins in the middle of the P wave and continues throughout the PR interval
The PR interval delay is necessary for what?
Ventricles to fill after atrial contraction
On EKG, where does atrial repolarization occur?
During the QRS complex but is hidden by the QRS
When does atrial muscle relaxation occur?
After the QRS complex and is accompanied by a decrease in atrial pressure
On EKG, where does ventricular contraction occur?
Peak of QRS complex and continues during the ST segment and T wave
When does the MV close on an EKG?
Peak of QRS complex (due to an increase in ventricular pressure as ventricles contract)
On an EKG, when does isovolumic contraction occur?
Peak of R wave and end of S wave
On an EKG, when do the semilunar valves open?
End of S wave
On EKG, when does the ventricular contraction force blood out into aorta?
Beginning of T wave
On EKG, when do the semilunar valves close?
At the end of the T wave
On EKG, when does the mitral valve open?
0.05 seconds after end of T wave (this is the end of isovolumic relaxation)
On EKG, when does isovolumic relaxation occur?
Ventricular muscle repolarization end of systole, onset of ventricular diastole, begins at end of T wave and ends 0.05 seconds after end of T wave (points e & f on wiggers diagram)