NCLEX RN Quiz # 994

NCLEX Examination,

Practice Question # 994.

 

nclex examination

 

Ventricular tachycardia (VT) is defined as three or more PVCs in a row, occurring at a rate exceeding 100 beats per minute. The causes are similar to those for PVC. VT is usually associated with coronary artery disease and may precede ventricular fibrillation. VT is an emergency because the patient is usually (although not always) unresponsive and pulseless.

  • Ventricular and atrial rate: Ventricular rate is 100 to 200 beats per minute; atrial rate depends on the underlying rhythm (eg, sinus rhythm)
  • Ventricular and atrial rhythm: Usually regular; atrial rhythm may also be regular.
  • QRS shape and duration: Duration is 0.12 seconds or more; bizarre, abnormal shape
  • wave: Very difficult to detect, so atrial rate and rhythm may be indeterminable
  • PR interval: Very irregular, if P waves seen.
  • P: QRS ratio: Difficult to determine, but if P waves are apparent, there are usually more QRS complexes than P waves.

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