[Predictive factors of abnormal dynamic intraventricular gradient after valve replacement in severe aortic stenosis].
BACKGROUND
Dynamic intraventricular gradients (DIG) after valve replacement in severe aortic stenosis have been reported, although the incidence of DIG and clinical signs are still poorly understood.Aim. To evaluate the incidence of DIG)and determine risk factors and associated morbimortality.


METHODS
One hundred nine consecutive patients with severe aortic valve stenosis undergoing valve replacement were studied prospectively by echocardiography to detect the postoperative appearance of DIG, defined as a maximum flow velocity >/= 2.5 m/s.


RESULTS
Sixteen patients (14.9%) developed postoperative DIG. Significant differences between the patients with or without DIG were found for ventricular diameter (left end-diastolic ventricular diameter (LEDVD) 43.2 vs. 47.7 mm, respectively, p < 0.001; left end-systolic ventricular diameter (LESVD) 21 vs. 29 mm, p < 0.001); left ventricular mass index (165 vs. 193 g/m(2), p < 0.05); mean aortic valve gradient (68 vs. 59 mmHg, p < 0.01),; ejection fraction (73 vs. 61%, p < 0.001). No significant differences were found with respect to ventricular wall thicknesses (septal 16.3 vs. 15.7; posterior 14.37 vs. 14.62), the presence of aortic insufficiency, or other postoperative factors (anemia, inotropic agents, etc.).


CONCLUSIONS
DIG after aortic valve replacement to treat severe stenosis is not unusual (15%). DIG is usually found at a midventricular location, close to the septum. In patients with postoperative DIG the most common associated factors were small LEDVD, high ejection fractions and ratios of intraventricular septal to posterior wall ratios, high valve gradients and small left ventricular masses. Preoperative echocardiography can identify patients with a higher risk of developing DIG after aortic valve replacement.
López Ayerbe
Jorge
J
Servicio de Cardiología, Hospital Universitari Germans Trias i Pujol, Badalona, Barcelona, Spain. jlopezayerbe@hotmail.com
Evangelista Masip
Arturo
A
Armada Romero
Eduardo
E
Mateos González
Marta
M
González Alujas
María Teresa
MT
García Del Castillo
Herminio
H
Roma García Campomanes
Francisco
F
Murtra Ferré
Marcos
M
Soler Soler
Jordi
J
D000328:Adult; D000368:Aged; D001021:Aortic Valve; D001024:Aortic Valve Stenosis / Q000401:mortality / Q000503:physiopathology* / Q000601:surgery*; D005260:Female; D006350:Heart Valve Prosthesis; D006352:Heart Ventricles / Q000503:physiopathology*; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D011182:Postoperative Care; D011183:Postoperative Complications / Q000453:epidemiology / Q000503:physiopathology*; D011300:Preoperative Care; D011446:Prospective Studies; D012720:Severity of Illness Index