Which of the following events can lead to ventricular fibrillation?
a. A ventricular rate of ninety beats a minute
b. A premature ventricular beat that occurs during the T wave
c. The presence of saw tooth waves instead of P waves on an electrocardiogram
d. An increased width of the QRS complex
ANS: B
A ventricular rate of ninety beats a minute is within normal limits. A premature ventricular beat during the T wave would be immediately after the relative refractory period and could lead to ventricular tachycardia or ventricular fibrillation. Saw toothed waves instead of P waves indicate that atrial flutter is present. An increased width of the QRS is associated with any ventricular arrhythmia.
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Tlv/cl ________________________________________________
Fill in the blank(s) with correct word
Your 62-year-old patient developed a sudden onset of left-sided weakness 20 minutes ago. She is very anxious and crying and is difficult to manage. Her vital signs are: BP, 168/100 mm Hg; P, 108 beats/min; R, 20 breaths/min; SaO2, 98%. Which of the following interventions is most critical?
A) Alert the stroke team and provide rapid transport. B) Administer diazepam 5 mg IV. C) Administer nitroglycerin 0.4 mg SL. D) Provide oxygen 15 L/min by nonrebreather mask.