Which of the following is untrue regarding "sick sinus syndrome":
Coronary disease is a common cause Sick sinus syndrome is usually caused by idiopathic fibrosis of the sinus node. - Coronary disease is an uncommon cause. - Pharmacologic therapy for sick sinus syndrome has been difficult but recent studies have indicated that oral theophylline may be effective especially when sinus bradycardia is the major manifestation.
Occurs most commonly in elderly
Coronary disease is a common cause
ECG manifestations are often intermittent
Most symptomatic patients will require permanent pacing.