BELIEVE-SVT is a European multi-centre, retrospective registry in tertiary hospitals performing electrophysiological study in patients with palpitations considered clinically suggestive of paroxysmal supraventricular tachycardia by a cardiologist and without electrocardiographic documentation of tachycardia or preexcitation. Clinical characteristics, results of electrophysiological study and ablation, complications, and clinical outcomes during follow-up will be analysed.

The "Symptom Burden As Guiding Principle For Invasive Electrophysiological Study In Paroxysmal Supraventricular Tachycardia (Believe-SVT)" study was a multi-centre, retrospective, observational registry carried out in tertiary European hospitals. Inclusion criteria were: symptoms that were considered suggestive of paroxysmal supraventricular tachycardia by a cardiologist and/or cardiac electrophysiologist; absence of any sort of electrocardiographic tracing during episodes (including wearables and other single lead devices), and having undergone an electrophysiological study aimed at the diagnosis of paroxysmal supraventricular tachycardia.

Inclusion criteria:

• Symptoms that were considered suggestive of paroxysmal supraventricular tachycardia by a cardiologist and/or cardiac electrophysiologist
• Absence of any sort of ECG tracing during episodes (including wearables and other single lead devices)

Exclusion criteria:

• Documentation of preexcitation
• Prior electrophysiological study aimed at the assessment of ventriculo-atrial conduction or induction of supraventricular tachycardias.

Patients with palpitations clinically suggestive of paroxysmal supraventricular tachycardia but no ECG documentation of tachycardia