PMC4531772_01
Twenty-four hour Holter monitoring record revealed cardiac asystoles, the longest lasting 7 seconds when the patient complained of dizziness and became pale during a venipuncture procedure.
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Holter recording showed cardiac asystoles, one of which lasted 7 secs (Figure 1). Head-up tilt test revealed hypotension (80/60 mmHg) associated relative bradycardia (72 beats/min) 10 minutes following intravenous administration of isoproterenol (2 ug/min) (Table 1).