Related Experiment Videos
Na+/H+ exchange inhibition improves post-transplant myocardial compliance in 4-hour stored donor hearts
Y I Kim1, P Herijgers, A Van Lommel
1Centre for Experimental Surgery and Anaesthesiology, Katholieke Universiteit Leuven, Belgium.
Insights
The novel Na+/H+ exchange inhibitor HOE642 enhanced myocardial compliance in canine heart transplants. This finding suggests HOE642 could improve heart preservation techniques for transplantation.
Area of Science:
- Cardiology
- Transplantation Biology
- Pharmacology
Background:
- Na+/H+ exchange inhibitors offer cardioprotective benefits.
- Assessing novel inhibitors like HOE642 is crucial for improving organ preservation.
Purpose of the Study:
- To evaluate the effects of the Na+/H+ exchange inhibitor HOE642 on myocardial function.
- To assess HOE642's impact on canine heart transplants preserved for 4 hours.
Main Methods:
- Canine brain-dead and non-brain-dead donor hearts were preserved and transplanted.
- Hearts were treated with HOE642 (2 mg/kg) or a placebo.
- Pressure-volume curves, histological, and ultrastructural analyses were performed post-reperfusion.
Main Results:
- HOE642 significantly improved myocardial compliance in both donor types.
- No significant differences were observed in myocardial water content or overall performance.
- Ultrastructural examination revealed no irreversible damage.
Conclusions:
- Administration of HOE642 enhances myocardial compliance following heart transplantation.
- HOE642 shows potential for improving current myocardial preservation strategies in transplantation.
Abstract:
Na+/H+ exchange inhibitors have cardioprotective properties. The effects of the new Na+/H+ exchange inhibitor, HOE642 on myocardial function were assessed after transplantation of canine brain-dead and non-brain-dead donor hearts preserved for 4 h. Four groups were studied: brain-dead donors; non-brain-dead donors; brain-dead donors and recipients treated with HOE642 (2 mg/kg); and treated non brain-dead donors and recipients. Donor hearts were stored in NIH2. At the end of 60 min reperfusion after transplantation, pressure-volume curves were constructed. Biopsies were analysed histologically and ultrastructurally. Afterwards, weaning from cardiopulmonary bypass was accomplished. HOE642 improved compliance in hearts from both brain-dead and non-brain-dead donors. No differences in myocardial water content nor in myocardial performance were detected. No irreversible damage was seen ultrastructurally. It is concluded that myocardial compliance after transplantation was improved by administration of HOE642. The use of this inhibitor might improve the current myocardial preservation technique for transplantation.