Page 103 - Critical Care Notes
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4223_Tab02_045-106 29/08/14 10:00 AM Page 97
97 P wave buried in T wave Supraventricular Tachycardia (SVT)
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drugs ineffective
Rate: 150–250 bpm
Rhythm: Usually regular
PR interval: Unable to determine
Causes: Nicotine, stress, anxiety, caffeine
P waves: Usually hidden in preceding T wave
QRS: 0.06–0.10 sec, >0.10 sec if conducted through the ventricles
Management: Vagal maneuver, adenosine (Adenocard, Adenoscan), amiodarone (Cordarone, Pacerone),
diltiazem (Cardizem), propafenone (Rythmol), flecainide (Tambocor); cardioversion or overdrive pacing if
CV
