[Cardiac resynchronization therapy in patients with permanent atrial fibrillation--with or without atrial lead?]

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Context:

• Severe heart failure and left bundle branch block necessitate biventricular defibrillator implantation for cardiac resynchronization therapy (CRT).
• Patients with permanent atrial fibrillation may not receive an atrial lead during CRT implantation.
• Successful CRT can improve heart failure symptoms, but complications can arise.

Purpose:

• To investigate the cause of symptom deterioration following successful cardiac resynchronization therapy (CRT) and defibrillation in a patient with severe heart failure.
• To analyze the electrocardiogram (ECG) findings that explain the adverse event.
• To highlight potential challenges in managing patients with complex cardiac conditions.

Summary:

• A 59-year-old male with severe heart failure, left bundle branch block, and permanent atrial fibrillation received a biventricular defibrillator for CRT.
• Initial CRT improved symptoms, but a subsequent shock for ventricular tachyarrhythmia led to severe symptom recurrence.
• An ECG performed one week post-shock revealed the underlying reason for the clinical deterioration.

Impact:

• This case underscores the importance of careful ECG interpretation after defibrillation in CRT patients.
• It highlights potential interactions between CRT devices and tachyarrhythmia management.
• Understanding such events can refine patient management strategies and improve outcomes in complex heart failure cases.