Outflow Graft Tamponade: An Underrecognized Cause of Obstruction

Area of Science:

• Cardiovascular Surgery
• Medical Devices
• Heart Failure Management

Background:

• Left ventricular assist device (LVAD) outflow graft obstruction can lead to severe clinical decline.
• Outflow graft tamponade, caused by external compression, is an under-recognized mechanism of obstruction.
• Management strategies for LVAD outflow graft tamponade lack standardization.

Purpose of the Study:

• To report single-center experience with LVAD outflow graft tamponade.
• To develop an optimal diagnostic and treatment algorithm for this complication.

Main Methods:

• Retrospective chart review of LVAD patients from July 2011 to July 2020.
• Identification of patients with outflow graft tamponade.
• Analysis of clinical presentation, device type, and management outcomes.

Main Results:

• Outflow graft tamponade was identified in 26 of 351 LVAD patients.
• Patients presented with heart failure symptoms, murmur, and LVAD alarms after a median of 862 days.
• Interventions included mini-thoracotomy (n=15), percutaneous balloon dilatation/stenting (n=4), and bridge to transplant (n=2).

Conclusions:

• Outflow graft tamponade is a distinct form of LVAD outflow graft obstruction.
• It presents variably and can cause significant hemodynamic compromise.
• Both surgical and percutaneous interventions are effective in restoring LVAD function.