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Postoperative Evaluation of Radial Artery Grafts for Coronary Artery Bypass Grafting by Transit Time-Doppler Flow Measurements.
A Comparative Study between Arterial and Venous Grafts
Autor: | Wanner, M.; Rosendahl, U.; Dalladaku, F.; Ennker, IC.; Ennker, J. |
Erscheinungsort: | The Thoracic and Cardiovascular Surgeon 2000; 48, Suppl. 1:50 |
Inhalt: | Objective: We analyzed and compared postoperative flow in radial artery and venous grafts used for coronary artery bypass grafting in order to evaluate their flow capacity.
Methods: A CardioMed transit time-Doppler flow measurement device was used to measure flow in radial artery and venous grafts anastomosed on the circumflex or right coronary artery in 76 patients. Measurements were taken after cessation of CPB. Each of the grafts was assigned to a comparable single target vessel system. For statistical analysis using standard statistical tests the pulsatile index (Qmax-Qmin/Qmean) of each measurement was used.
Results: Pulsatile index of radial artery and venous bypasses: |
| Radial artery to RCA | Venous graft to RCA |
|---|
PI(mean) | 1,6 | 2,6 | SD | 0,5 | 2,1 | Min | 0,7 | 1,1 | Max | 2,6 | 11,8 | p-value | 0,04 |
|
| Radial artery to CX | Venous graft to CX |
|---|
PI(mean) | 2,0 | 2,2 | SD | 1,0 | 1,1 | Min | 0,4 | 0,9 | Max | 6,1 | 4,0 | p-value | n.s. |
|
| The pulsatile index showed statistically significant lower value in radial artery grafts than in venous grafts anastomosed onto the RCA meaning superior flow characteristics in radial artery grafts than in venous grafts.
Conclusion: Closely after coronary artery bypass grafting flow measurements in radial artery grafts are equivalent to that of venous grafts anastomosed to similar target vessels. Possible perioperative spasm of the radial artery does not play a major role regarding flow characteristics. |
