Q:

Ventricular extrasystoles

safaTerkawi
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2022-08-08
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Ventricular extrasystoles.

  1. Are usually associated with a normal QRS complex.
  2. From the same focus have similar QRS complexes.
  3. Usually occur following a compensatory pause.
  4. May fail to produce a pulse at the wrist.
  5. Indicate serious heart disease.
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safaTerkawi
2022-08-08
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A. False  Extrasystoles are associated with a prolonged abnormal QRS complex; the impulse pathway from the ectopic focus over the myocardium is abnormal and slow.

B. True If the focus is the same, the pathway for ventricular excitation will be the same.

C. False  They are followed by a compensatory pause; the next normal beat may reach the ventricles when they are refractory – a beat is lost.

D. True If they occur early in diastole, poor ventricular filling results in weak contractions and small pulses.

E. False They occur occasionally in many normal hearts.

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