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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

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[Short QT syndrome--a case report].

Stefan Sawicki¹, Wojciech Stadnicki, Jacek Kuśnierz

¹Klinika Kardiologii Zachowawczej, Centralny Szpital Kliniczny MSWiA, ul. Wołoska 137, Warsaw. s.sawicki@plusnet.pl

Kardiologia Polska

|April 9, 2008

Summary

We report two new cases of short QT syndrome (SQTS) in a mother and son. Despite negative invasive tests, genetic studies were initiated due to polymorphic ventricular tachycardia, leading to ICD implantation in the son.

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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

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Area of Science:

Cardiology
Genetics
Electrophysiology

Background:

Short QT syndrome (SQTS) is a rare genetic disorder characterized by rapid ventricular repolarization.
It is associated with an increased risk of life-threatening arrhythmias and sudden cardiac death.
Diagnosis and management can be challenging due to variable presentation and limited therapeutic options.

Observation:

Two new cases of SQTS are presented: a 23-year-old male and his 42-year-old mother.
Both patients underwent invasive electrophysiological studies, which yielded negative results.
The male patient experienced polymorphic ventricular tachycardia, necessitating implantable cardioverter-defibrillator (ICD) implantation for primary prevention.

Findings:

The study highlights the diagnostic challenges in SQTS, particularly when invasive tests are inconclusive.
Polymorphic ventricular tachycardia in the context of a suspected inherited channelopathy warrants further investigation.
Genetic studies were pursued to identify the underlying molecular basis of SQTS in these patients.

Implications:

This case series underscores the importance of considering genetic testing in patients with suspected SQTS, even with non-diagnostic electrophysiological findings.
Early diagnosis and appropriate management, including ICD implantation, are crucial for preventing sudden cardiac death in affected individuals.
Further research into the genetic underpinnings and long-term management strategies for SQTS is warranted.