Coronary flow characteristics after a Bentall procedure with or without sinuses of Valsalva.
OBJECTIVE
The sinuses of Valsalva are known to contribute to the normal function of the aortic valve. Little is known about their role in promoting coronary artery blood flow. The aim of this study was to compare coronary artery flow characteristics among patients undergoing a Bentall operation by means of a conventional cylindrical Dacron conduit or with a new conduit with pseudosinuses of Valsalva or in patients retaining their natural sinuses of Valsalva after aortic valve and supracoronary ascending aorta replacement.


METHODS
One year after a Bentall procedure with a standard cylindrical Dacron conduit (7 patients, group A) or with the new conduit (7 patients, group B), or after aortic valve and ascending aortic replacement (control group, 7 patients, group C) coronary flow velocity reserve and diastolic to systolic time integral ratio at baseline and after maximal hyperemia (with 40 microg of adenosine) were assessed by using a 0.014-in. Doppler guidewire positioned in the middle portion of the left anterior descending coronary artery. All patients were in NYHA class I, sinus rhythm and free of coronary disease.


RESULTS
Arterial blood pressures and heart rate were comparable among groups. Intracoronary Doppler measurements did not show any significant difference in coronary vascular reserve between the three groups (3.6+/-0.4 vs 3.1+/-0.7 vs 3.7+/-0.5, P = 0.2). A greater diastolic component at baseline was present in group B patients (5.5+/-1.9 vs 3.5+/-0.9 in group A and 3.7+/-0.9 in group C, P = 0.024). After maximal hyperemia the diastolic component increased slightly in group A patients (8%) while both in groups B and C significantly decreased (-15 and -20%, respectively) (P = 0.017).


CONCLUSIONS
The presence of pseudosinuses of Valsalva does not influence coronary flow reserve. After maximal coronary vasodilation the increase in the systolic component of coronary flow is more evident in the presence of sinuses or pseudosinuses of Valsalva, thus suggesting that coronary flow pattern may be affected by the presence of sinuses.
de Paulis
Ruggero
R
Cattedra di Cardiochirurgia, Università di Roma Tor Vergata, European Hospital, via Portuense 700, 00149 Roma, Italy. depauli@tin.it
Tomai
Fabrizio
F
Bertoldo
Fabio
F
Ghini
Anna S
AS
Scaffa
Raffaele
R
Nardi
Paolo
P
Chiariello
Luigi
L
D000368:Aged; D001011:Aorta / Q000601:surgery; D001021:Aortic Valve / Q000601:surgery*; D003326:Coronary Circulation; D003331:Coronary Vessels / Q000000981:diagnostic imaging; D005260:Female; D006349:Heart Valve Diseases / Q000601:surgery*; D006350:Heart Valve Prosthesis; D019918:Heart Valve Prosthesis Implantation / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D011474:Prosthesis Design; D012850:Sinus of Valsalva / Q000502:physiology*; D014463:Ultrasonography