Paroxysmal supraventricular tachycardia (PSVT) is a form of arrhythmia characterized by a rapid heart rate, often with an irregular rhythm. It can occur in patients of any age and in those who do not have an existing heart condition. A normal heart rate is between 60 and 100 beats per minute (bpm), but someone with PSVT may experience heart rates as high as 250 bpm.

Symptoms of PSVT are heart palpitations, a rapid pulse, anxiety, shortness of breath, sweating, a pounding sensation in the neck, chest pain, and tightness in the chest. In severe cases, PSVT can lead to dizziness and fainting caused by insufficient blood flow to the brain. Should you experience chest pain, it is important to consult with a physician or if the chest pain is severe, it may be necessary to visit the emergency room. 

PSVT is often triggered by an external factor, such as stress, lack of sleep, or lack of physical activity. Existing medical conditions may also increase the risk of PSVT, such as heart failure, heart disease, chronic lung disease, thyroid disease. Other factors that increase the risk of PSVT are drinking alcohol, ingesting caffeine, smoking, use of illegal substances, and certain medications, including some used to treat allergies and coughs. 

The first step in treating PSVT is to stop an episode, either through physical maneuvers, such as the Valsalva maneuver or with medication. Physicians will aim to identify the cause of PSVT and provide treatment to prevent further episodes. In some cases, surgery in the form of ablation may also be effective. Drug classes commonly used to treat PSVT are beta blockers, anti-arrhythmics, class IV and plain cardiac glycosides.