NCLEX RN Practice Question # 940

NCLEX Examination.

Practice Question # 940.

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. VT has the following characteristics.

P 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.