Heart_Blocks.doc - 1 First Degree Second Degree and Third Degree Heart Blocks(AtrioVentricular Blocks Please review for discussion in class

Heart_Blocks.doc - 1 First Degree Second Degree and Third...

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1 First Degree, Second Degree, and Third Degree Heart Blocks (AtrioVentricular Blocks) Please review for discussion in class Atrioventricular blocks have a disruption in impulse conduction from the atria to the ventricles. There can be a delay in conduction through the AV node (first degree), intermittent blockage (second degree) or complete blockage (third degree). When viewing the ECG tracing you should question: Is the ECG tracing regular or irregular, is there a pattern, does a QRS follow every P wave, is the PR interval the same with each beat? Measure the PR intervals. Normal Sinus Rhythm (for comparison) P- -QRS- - -T P- -QRS- - -T P- -QRS- - -T P- -QRS- - -T P- -QRS- - -T P- -QRS- - -T P- -QRS- - -T P- -QRS- - -T First-Degree Heart Block Prolonged PR interval > 0.20 Rhythm is regular P - - - - - QRS- - -T P - - - - - QRS- - -T P - - - - - QRS- - -T P - - - - - QRS- - -T P - - - - - QRS- - -T P - - - - - QRS- - -T
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2 Second-Degree Heart Block Mobitz Type I (Wenckebach) Occurs at the level of the AV node Progressive lengthening of the PR interval usually over 3 to 4 beats and then a P wave is not conducted. Pattern is repeated NO QRS
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  • Spring '19
  • Shirly Wolfe
  • Sinoatrial node, QRS complex, Heart block, first degree

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