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A comparison of distribution between simultaneously or sequentially delivered antegrade/retrograde blood cardioplegia
Insights
Sequential antegrade/retrograde cardioplegia delivery may offer a slight advantage over simultaneous methods. However, this difference was not statistically significant, suggesting either approach is acceptable for cardiac surgery.
Area of Science:
- Cardiovascular Surgery
- Cardioplegia Delivery Systems
- Myocardial Protection
Background:
- Modern cardioplegia systems enable both sequential and simultaneous antegrade and retrograde perfusion.
- Comparing these delivery methods is crucial for optimizing myocardial protection during cardiac procedures.
Purpose of the Study:
- To compare the total flow and regional distribution of sequential versus simultaneous antegrade/retrograde cardioplegia delivery.
- To evaluate the efficacy of different cardioplegia delivery strategies in an ex vivo model.
Main Methods:
- Explanted human hearts underwent cold cardioplegic arrest and bicaval cardiectomy.
- Cardioplegia with colored microspheres was delivered antegrade (80 mmHg) or retrograde (40 mmHg).
- Groups received either sequential (2 min each) or simultaneous (2 min total) antegrade/retrograde delivery; myocardial samples were analyzed for flow.
Main Results:
- Mean total cardioplegia delivery per minute was slightly higher in the sequential group (0.69 mL/g/min) compared to the simultaneous group (0.46 mL/g/min).
- Regional cardioplegic flow at 12 ventricular sites was generally greater with sequential delivery.
- These differences in total and regional flow were not statistically significant (p > 0.05).
Conclusions:
- Sequential antegrade/retrograde cardioplegia delivery may offer a marginal benefit in flow compared to simultaneous delivery.
- The observed differences were not statistically significant and likely lack clinical relevance.
- Either sequential or simultaneous delivery can be recommended based on surgical convenience.
Unlabelled:
Commercially available cardioplegia delivery systems now allow for antegrade (aortic root, coronary ostia, saphenous vein graft) perfusion to occur either sequentially or simultaneous with retrograde (coronary sinus) perfusion. This study was designed to compare the total flow and local distribution of sequential versus simultaneous antegrade/retrograde cardioplegia delivery.
Methods:
Explanted human hearts diagnosed with idiopathic cardiomyopathy underwent a cold cardioplegic arrest and bicaval cardiectomy. Thirty-seven degree centigrade blood cardioplegia containing colored microspheres was then delivered antegrade (red color) at a pressure of 80 mmHg or retrograde (blue color) at a pressure of 40 mmHg. In the sequential group (n = 6), cardioplegia was delivered antegrade and then retrograde for 2 minutes, respectively. For the simultaneous group (n = 6), cardioplegia was delivered both antegrade and retrograde for 2 minutes. The ventricular myocardium was then sampled at 12 representative sites to determine regional cardioplegic flow.
Results:
Mean total cardioplegia delivery/minute was 0.69 +/- 0.62 mL/g per minute for sequential cardioplegia, and 0.46 +/- 0.19 mL/g per minute for simultaneous cardioplegia (p > 0.05, NS). At the 12 ventricular sites sampled, mean regional cardioplegic flow (mL/g per min) was in general slightly greater for sequential delivery. However, this was not statistically significant (p > 0.05, NS).
Conclusion:
The data suggest that there may be a slight advantage in total cardioplegia delivery and regional cardioplegia delivery when using sequential rather than simultaneous cardioplegia delivery. However, this difference was not statistically significant and is likely not of clinical significance. Therefore, we would recommend using either sequential or simultaneous antegrade/retrograde cardioplegia based upon whichever technique facilitates the conduct of the individual operation.