Supraventricular tachycardia (SVT), often referred to as paroxysmal supraventricular tachycardia, is an abnormally fast or irregular heartbeat (arrhythmia) that affects the upper chambers of the heart. The underlying issue lies in the malfunctioning electrical signals and circuitry within the heart. When the heart beats excessively fast, it hinders the proper filling of blood during each beat, thereby impeding the adequate supply of blood to the body.
The average heartbeat is between 60 and 100 beats per minute. A tachycardia is characterized by a heartbeat rate more than 100 per minute. The heart typically beats between 150 and 220 times per minute throughout an episode of SVT, while it can occasionally beat more quickly or slowly.
The three primary types of supraventricular tachycardia (SVT) are as follows:
Supraventricular tachycardia (SVT) often does not necessitate treatment or restrictions on daily activities for the majority of patients. However, certain individuals may benefit from making lifestyle modifications, taking medications, or undergoing heart surgeries to control or eliminate their rapid heartbeats and accompanying symptoms.
Supraventricular tachycardia (SVT) is identified by an accelerated heart rate that exceeds 100 beats per minute, surpassing the normal range. This condition can endure for a brief period of a few minutes to several days. It typically occurs sporadically, interspersed with intervals of normal heart rate.
Supraventricular tachycardia signs and symptoms can include:
Identifying signs and symptoms of SVT in infants and young children can pose a challenge. These symptoms include perspiration, pale skin, poor feeding and a rapid heartbeat. It is advisable to consult a healthcare provider regarding the possibility of SVT screening if an infant or young child displays any of these symptoms.
In the absence of heart injury or other underlying heart conditions, supraventricular tachycardia (SVT) is generally not considered life–threatening. However, if an individual encounters their first episode of a significantly rapid heartbeat or if an irregular heartbeat persists for more than a few seconds, it is advisable to seek medical attention by contacting a healthcare provider. In severe instances, an episode of SVT has the potential to lead to loss of consciousness or cardiac arrest.
Certain symptoms and signs of SVT may indicate a significant medical concern. It is crucial to promptly seek medical attention if an SVT episode extends beyond a few minutes or if accompanying symptoms such as chest pain, shortness of breath, weakness, or dizziness are experienced. Taking these indicators seriously and seeking immediate medical evaluation is recommended.
Supraventricular tachycardia (SVT) arises from an issue with the heart’s electrical signals or circuits, although some individuals may be unaware of the specific causes behind their symptoms. In certain cases, the episodes of SVT can be attributed to clear triggers like physical activity, stress, or inadequate sleep. However, for some individuals, identifying an obvious trigger may be challenging or not possible.
An SVT episode may result from various factors, such as:
Factors that could increase the risk of supraventricular tachycardia include:
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