Abstract
BackgroundCongenital long QT syndrome (LQTS) can cause ventricular arrhythmic events with syncope and sudden death resulting from malignant torsades de pointes (TdP) followed by ventricular fibrillations (VFs). However, the syndrome is often overlooked prior to the development of arrhythmic events in patients with congenital heart diseases demonstrating right bundle branch block on electrocardiogram (ECG). We present a case of an adult patient with congenital heart disease who developed VFs postoperatively, potentially due to his mutation in a LQTS related gene, which was not identified on preoperative assessment due to incomplete evaluation of his family history.Case presentationA 64-year-old man was diagnosed as having multiple atrial septal defects. He presented with no symptoms of heart failure. His preoperative ECG showed complete right bundle branch block (CRBBB) with a corrected QT interval time of 478 ms. He underwent open-heart surgery to close the defects through median sternotomy access. Three hours after the operation, he developed multiple events of TdP and VFs in the intensive care unit. Cardiopulmonary resuscitation and multiple cardioversions were attempted for his repetitive TdP and VFs. He eventually reverted to sinus rhythm, and intravenous beta-blocker was administered to maintain the sinus rhythm. After this event, his family history was reviewed, and it was confirmed that his daughter and grandson had a medical history of arrhythmia. A genetic test confirmed that he had a missense mutation in CACNA1C, p.K1580 T, which is the cause for type 8.ConclusionsThis case highlights the importance of paying attention to other ECG findings in patients with CRBBB, which can mask prolonged QT intervals.
Highlights
Congenital long QT syndrome (LQTS) can cause ventricular arrhythmic events with syncope and sudden death resulting from malignant torsades de pointes (TdP) followed by ventricular fibrillations (VFs)
This case highlights the importance of paying attention to other ECG findings in patients with complete right bundle branch block (CRBBB), which can mask prolonged QT intervals
If the diagnosis of the syndrome is made before open heart surgery, clinicians can avoid factors contributing to the prolongation of QT intervals and, as a result, may be able to prevent ventricular arrhythmias postoperatively [4]
Summary
This case highlights the importance of taking a thorough family history in patients due to undergo open heart surgeries. All authors have read and approved the final manuscript. Consent for publication Written informed consent was gained from the patient for the publication of this article. Implications of anesthesia in children with long qt syndrome. Author details 1Department of Cardiovascular Surgery, Ehime University, Shitsukawa, Toon, Ehime 7910295, Japan. Author details 1Department of Cardiovascular Surgery, Ehime University, Shitsukawa, Toon, Ehime 7910295, Japan. 2Department of Cardiothoracic Surgery, St Vincent’s Hospital, Sydney, NSW, Australia. 3Department of Pediatric Cardiology, Children’s Medical Center, Ehime University, Ehime, Japan. 4Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Shiga, Japan
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