What causes SVT in adults?

As a medical professional with expertise in cardiology, I can provide you with an informed response regarding the causes of Supraventricular Tachycardia (SVT) in adults. SVT is a rapid heart rate that originates above the ventricles, typically in the atria or the atrioventricular (AV) node. It is not always life-threatening but can be uncomfortable and distressing for the individual experiencing it. There are several factors that can contribute to the development of SVT in adults: 1. Underlying Heart Conditions: People with heart diseases such as mitral valve prolapse, coronary artery disease, or congenital heart disease are at a higher risk of developing SVT. 2. Electrolyte Imbalances: Imbalances in electrolytes like potassium, calcium, and magnesium can affect the electrical activity of the heart and lead to SVT. 3. Stress and Anxiety: Intense emotional or physical stress can trigger SVT in some individuals. 4. Excessive Caffeine or Alcohol Intake: Overconsumption of these substances can stimulate the heart and lead to an irregular rhythm. 5. Certain Medications: Some medications, including asthma medications, decongestants, and certain antidepressants, can cause SVT as a side effect. 6. Illicit Drug Use: The use of stimulant drugs like cocaine or amphetamines can also induce SVT. 7. Pre-existing Heart Rhythm Disorders: Conditions such as atrial fibrillation or atrial flutter can progress to SVT. 8. Obesity: Excess weight can put additional strain on the heart, potentially leading to SVT. 9. Sleep Apnea: This sleep disorder can cause disruptions in breathing during sleep, which may contribute to the development of SVT. 10. Endocrine Disorders: Conditions like hyperthyroidism can increase the risk of developing SVT. It's important to note that SVT can also occur in individuals without any identifiable cause, which is referred to as "lifestyle" or "idiopathic" SVT.

Most episodes of SVT are caused by faulty electrical connections in the heart . SVT also can be caused by certain medicines. Examples include very high levels of the heart medicine digoxin or the lung medicine theophylline. Some types of SVT may run in families, such as Wolff-Parkinson-White syndrome.