What are the causes of paroxysmal supraventricular tachycardia? sx's? EKG appearance? tx? Causes:
a) Reentry tachycardia involving the AV node
b) Atrial tachycardia
c) Accessory pathway (e.g., Wolff-Parkinson-White syndrome)
d) Triggered activity

Symptoms:
a) Palpitations
b) Chest discomfort
c) Shortness of breath
d) Dizziness or lightheadedness

EKG Appearance:
a) Regular narrow QRS complexes
b) Heart rate > 100 beats per minute
c) Absence of P waves or retrograde P waves
d) Normal axis

Treatment:
a) Vagal maneuvers (e.g., Valsalva maneuver)
b) Adenosine
c) Beta-blockers or calcium channel blockers
d) Electrical cardioversion