Differential Diagnosis for SVT likely consistent with AVNRT

• Single most likely diagnosis
  • AVNRT (Atrioventricular Nodal Reentrant Tachycardia): This is the most likely diagnosis given the presentation of SVT, as AVNRT is a common cause of SVT and the clinical presentation is consistent with this diagnosis.
• Other Likely diagnoses
  • AVRT (Atrioventricular Reentrant Tachycardia): This is another common cause of SVT and can present similarly to AVNRT, making it a likely consideration in the differential diagnosis.
  • Orthodromic AVRT: A specific type of AVRT that can also present with SVT and is often difficult to distinguish from AVNRT without further testing.
• Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
  • VT (Ventricular Tachycardia): Although less common than supraventricular causes, VT can present with a wide complex tachycardia and is a life-threatening condition that must be considered and ruled out promptly.
  • Pre-excited AF (Atrial Fibrillation) in Wolff-Parkinson-White Syndrome: This condition can lead to rapid ventricular rates and is potentially life-threatening, making it crucial not to miss.
• Rare diagnoses
  • Junctional Tachycardia: A rare cause of SVT that can be considered if other more common causes are ruled out.
  • Atrial Tachycardia: Although not as common as AVNRT or AVRT, atrial tachycardia can present with SVT and should be considered in the differential diagnosis, especially if the patient has underlying heart disease.