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The cause of the hemodynamic disturbances in Ebstein's anomaly based on observations at operation
Insights
Open-heart surgery for Ebstein's anomaly effectively treats arrhythmias and obstruction by interrupting accessory pathways like the Kent bundle and repairing the tricuspid valve. Surgical intervention improves patient outcomes and quality of life.
Area of Science:
- Cardiology
- Cardiac Surgery
- Electrophysiology
Background:
- Ebstein's anomaly is a congenital heart defect affecting the tricuspid valve.
- Accessory pathways, such as the Kent bundle, can cause arrhythmias in patients with Ebstein's anomaly.
- Associated conditions include atrial septal defects and right ventricular obstruction.
Purpose of the Study:
- To evaluate the outcomes of open-heart surgery in adult patients with Ebstein's anomaly.
- To assess the efficacy of interrupting Kent bundles and addressing associated cardiac defects.
- To determine the indications for surgical intervention in Ebstein's anomaly.
Main Methods:
- Ten adult patients with Ebstein's anomaly underwent open-heart surgery.
- Procedures included interruption of Kent bundles, closure of patent foramen ovale, and tricuspid valve replacement.
- Patients were categorized into three groups based on presenting symptoms and surgical approach.
Main Results:
- Successful interruption of the Kent bundle was achieved in most patients, resolving supraventricular tachycardia (SVT).
- Tricuspid valve replacement relieved obstruction between the atrialized and functioning right ventricle (RV).
- Surgical intervention improved symptoms of cyanosis, dyspnea, and right heart failure.
Conclusions:
- Open-heart surgery is indicated for Ebstein's anomaly with refractory arrhythmias, atrial septal defects, or RV obstruction.
- Interruption of accessory pathways and tricuspid valve repair/replacement are effective surgical strategies.
- Surgical management significantly improves clinical status and addresses complex congenital heart disease.
Abstract:
Ten adult patients with Ebstein's anomaly had open-heart operation for interruption of a Kent bundle. The 4 patients in Group 1 had arrhythmias. One patient had a patent foramen ovale, which was closed. In 3 patients the Kent pathway was identified and interrupted, but in the other only the pathway's anterograde function was interrupted, leaving the patient subject to supraventricular tachycardia (SVT). The 3 patients in Group 2 had mild to moderate cyanosis and dyspnea during SVT as well as mild impairment during strenuous physical activity. Only interruption of their Kent bundles and closure of the patent foramen ovale were done. The 3 patients in Group 3 had dyspnea and cyanosis on exertion, and 1 had overt right heart failure. In each patient, obstruction between the atrialized right ventricle (RV) and functioning RV by the displaced tricuspid valve (TV) was relieved by valve excision and replacement. Interruption of the Kent bundle was successful in 2 of the 3 patients. Operation for Ebstein's anomaly is indicated when any of the following conditions are present: arrhythmias due to Kent bundles that are refractory to medical management; a defect in the atrial septum that must be closed because of a history of cyanosis or paradoxical emboli, or an arrhythmia that must be corrected by right atriotomy; and obstruction between the atrialized and functioning RV or a small functioning RV, both of which can be corrected by TV replacement.