Mechanical support for acutely failed heart or lung grafts

Area of Science:

• Cardiovascular and Pulmonary Medicine
• Transplantation Immunology
• Critical Care Medicine

Background:

• Thoracic allograft dysfunction remains a significant challenge post-transplantation.
• Medical therapies are not always sufficient for refractory allograft failure.
• Invasive interventions are sometimes necessary to support failing heart and lung allografts.

Purpose of the Study:

• To review the indications for mechanical assist devices, inhaled nitric oxide (iNO), and extracorporeal membrane oxygenation (ECMO).
• To discuss the complications associated with these advanced therapies.
• To analyze patient survival rates in thoracic transplant recipients requiring these interventions.

Main Methods:

• Review of case reports and patient series on mechanical circulatory support, iNO, and ECMO.
• Focus on refractory heart, lung, and heart-lung allograft failure.
• Analysis of data regarding efficacy, risks, and outcomes.

Main Results:

• Inhaled nitric oxide (iNO) is effective for pulmonary hypertension associated with allograft failure (5-70 ppm) with low toxicity.
• Mechanical assist devices and ECMO are used for severe cases but have higher complication risks (bleeding, neurological injury, death).
• Intensive monitoring is crucial for utilization and weaning from these support modalities.

Conclusions:

• Mechanical circulatory support, iNO, and ECMO are valuable tools for managing refractory thoracic allograft failure.
• Careful patient selection and intensive monitoring are essential to mitigate risks and optimize outcomes.
• While prospective studies are challenging, existing data support the use of these advanced therapies in select transplant patients.