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Not All "Idiopathic" PVCs Are Benign: Concealed Long QT Syndrome Unmasked by RVOT PVC Ablation.

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PubMed
Summary

A young woman developed torsades de pointes during ablation for presumed idiopathic right ventricular outflow tract premature ventricular contractions (RVOT PVCs), revealing concealed Long QT Syndrome type 1 (LQT1). Careful ECG review is vital before intervention, as RVOT PVCs can indicate underlying LQT1.

Keywords:
RVOT ablationautonomic modulationlong QT syndrome

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Genetics

Background:

  • Idiopathic right ventricular outflow tract premature ventricular contractions (RVOT PVCs) are often treated with ablation.
  • Long QT Syndrome (LQT) is a genetic disorder affecting cardiac repolarization.
  • Concealed LQT1 can present with subtle ECG abnormalities.

Purpose of the Study:

  • To highlight the association between RVOT PVCs and concealed Long QT Syndrome type 1 (LQT1).
  • To emphasize the importance of pre-ablation ECG evaluation for identifying subtle repolarization abnormalities.
  • To caution against assuming all RVOT PVCs are benign.

Main Methods:

  • Case report of a young woman undergoing ablation for presumed idiopathic RVOT PVCs.
  • ECG analysis before and during the procedure.
  • Diagnosis of concealed LQT1 based on clinical presentation and ECG findings.

Main Results:

  • The patient developed torsades de pointes during the ablation procedure.
  • A diagnosis of concealed LQT1 was established.
  • Subtle, rate-dependent repolarization abnormalities were noted on the pre-ablation ECG.

Conclusions:

  • Subtle ECG abnormalities preceding ablation may indicate concealed LQT1.
  • Thorough ECG scrutiny is essential before ablating presumed idiopathic RVOT PVCs.
  • Not all RVOT PVCs originate from benign sources; LQT1 should be considered.