Patient selection for mechanical bridging to transplantation

Area of Science:

• Cardiology
• Medical Devices
• Transplantation Medicine

Background:

• Patients with advanced heart failure face risks of fatal hemodynamic deterioration or sudden death before cardiac transplantation.
• Medical therapy stabilizes 60-80% of candidates, but current mechanical support criteria focus on hospitalized patients with high mortality risk.
• Ambulatory patients, comprising 90-95% of the waiting list, face long waits (often >2 years) and require strategies for extended survival.

Purpose of the Study:

• To identify clinical and hemodynamic profiles of ambulatory advanced heart failure patients unlikely to survive without urgent transplantation.
• To evaluate the predictive value of specific parameters for 2-year survival in this population.
• To inform the development of mechanical support strategies for ambulatory patients awaiting cardiac transplantation.

Main Methods:

• Analysis of 265 potential transplant candidates discharged with New York Heart Association class IV status and ejection fraction ≤0.25 between 1988-1993.
• Assessment of clinical, hemodynamic, and echocardiographic profiles.
• Evaluation of 2-year survival rates without urgent transplantation based on identified parameters.

Main Results:

• Tailored medical therapy alone yielded 45% 2-year survival without urgent transplantation.
• Left ventricular diastolic dimension ≥80 mm was associated with only 29% 2-year survival.
• Serum sodium <132 mEq/L predicted 35% 2-year survival; peak oxygen consumption <10 mL/kg/min indicated poor outcome but was often unmeasured.

Conclusions:

• Defining indications for urgent bridging requires complex risk assessment.
• A larger ambulatory population may benefit from improved mechanical support devices for extended survival without transplantation.
• Further research into predictive markers and advanced devices is crucial for managing ambulatory advanced heart failure patients.