Heart Failure VI: Adjunct Therapies

An implantable cardioverter-defibrillator (ICD) is a device that detects and terminates life-threatening arrhythmias in patients with severe left ventricular dysfunction. ICDs are indicated for patients with an ejection fraction of 35% or less who have symptomatic heart failure or have experienced cardiac arrest due to ventricular arrhythmia, helping prevent sudden cardiac death and improve survival rates.

Cardiac resynchronization therapy (CRT) uses a biventricular pacemaker to synchronize contractions of the left and right ventricles in patients with prolonged QRS duration on their ECG. By correcting electrical conduction abnormalities, CRT improves cardiac function and reduces heart failure manifestations in patients who have not responded to standard therapy.

Ventricular assist devices (VADs) are mechanical pumps that support the heart's function in patients with severe heart failure by ensuring adequate blood flow throughout the body. They provide temporary or long-term circulatory support, allowing the heart to rest and maintain hemodynamic stability in critically ill patients.

Ultrafiltration, or aquapheresis, removes excess fluid from patients with severe fluid overload unresponsive to diuretic therapy. A dual-lumen central IV catheter circulates blood through a bedside filtration machine, removing liters of excess fluid over several hours while monitoring volume status through filtration output, blood pressure, and hemoglobin levels.

Heart failure patients should follow a low-sodium diet with no more than two grams per day and learn to read food labels identifying low and high sodium foods. Patients with mild to moderate heart failure typically do not need fluid restrictions, but those with stage D heart failure and persistent fluid retention may require them, with daily weight monitoring recommended.

Supplemental oxygen therapy becomes necessary as heart failure progresses based on the severity of pulmonary congestion and resulting hypoxia. Some patients require supplemental oxygen only during periods of physical activity, while others may need continuous oxygen support depending on their clinical presentation and oxygenation status.

Continuous positive airway pressure (CPAP) is recommended for heart failure patients diagnosed with obstructive sleep apnea following a sleep study. CPAP improves sleep quality, reduces apneic episodes and daytime sleepiness, and enhances nocturnal oxygenation, supporting better overall outcomes in heart failure management.