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Paroxysmal supraventricular tachycardia (PSVT)

Alternative Names: PSVT; Supraventricular tachycardia Symptoms: Palpitations (a sensation of feeling the heart beat) Rapid pulse Anxiety, feeling of impending doom Shortness of breath Chest tightness Additional symptoms that may be associated with this disease: Fainting Dizziness Note: Symptoms may start and stop suddenly, and can last for a few minutes or several hours. A PSVT lasting more than 50% of the day is considered an incessant PSVT. Text Continues Below Signs and tests: An examination during a PSVT epsiode detects a regular, rapid heart rate. The heart rate may be 150 to 250 beats per minute (bpm) (in children the heart rate tends to be very high). There may be signs of poor perfusion (blood circulation) such as light-headedness. Between episodes of PSVT, the heart rate is normal (60 to 100 bpm). An ECG during symptoms shows PSVT. Because of the sporadic nature of the PSVT, its diagnosis may require continuous ambulatory monitoring. The most common is the 24-hour Holter monitoring. For longer recording periods, a "loop recorder" (with computer memory) is used. An electrophysiology study (EPS) is often necessary for an accurate diagnosis, and to recommend the best treatment.

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