Outcome of patients with aortic stenosis, small valve area, and low-flow, low-gradient despite preserved left ventricular ejection fraction.
OBJECTIVE
The aim of this case match study was to compare the outcome of patients with paradoxical low-flow (left ventricular ejection fraction [LVEF] ≥50% but stroke volume index <35 ml/m(2)), low-gradient (mean gradient [MG] <40 mm Hg), a priori severe (aortic valve area [AVA] ≤1.0 cm(2)) aortic stenosis (AS) (PLG-SAS group) with that of patients with a severe AS (AVA ≤1.0 cm(2)) and consistent high-gradient (MG ≥40 mm Hg) (HG-SAS group) and with that of patients with a moderate AS (AVA >1.0 cm(2) and MG <40 mm Hg) (MAS group).


BACKGROUND
In patients with preserved LVEF, a discordance between the AVA (in the severe range) and the gradient (in the moderate range) raises uncertainty with regard to the actual severity of the stenosis and thus the therapeutic management of the patient.


METHODS
In a prospective cohort of AS patients with LVEF ≥50%, we identified 187 patients in the PLG-SAS group. These patients were retrospectively matched: 1) according to the gradient, with 187 patients with MAS; and 2) according to the AVA, with 187 patients with HG-SAS.


RESULTS
Patients with PLG-SAS had reduced overall survival (1-year: 89 ± 2%; 5-year: 64 ± 4%) compared with patients with HG-SAS (1-year: 96 ± 1%; 5-year: 82 ± 3%) or MAS (1-year: 96 ± 1%; 5-year: 81 ± 3%). After adjustment for other risk factors, patients with PLG-SAS had a 1.71-fold increase in overall mortality and a 2.09-fold increase in cardiovascular mortality compared with the 2 other groups. Aortic valve replacement was significantly associated with improved survival in the HG-SAS group (hazard ratio: 0.18; p = 0.001) and in the PLG-SAS group (hazard ratio: 0.50; p = 0.04) but not in the MAS group.


CONCLUSIONS
Prognosis of patients with paradoxical low-flow, low-gradient severe AS was definitely worse than those with high-gradient severe AS or those with moderate AS. The finding of a low gradient cannot exclude the presence of a severe stenosis in a patient with a small AVA and preserved LVEF and should mandatorily prompt further investigation.
Institut Universitaire de Cardiologie et de Pneumologie de Québec/Québec Heart and Lung Institute, Laval University, Québec, Canada.
Marie-Annick
MA
Clavel
Jean G
JG
Dumesnil
Romain
R
Capoulade
Patrick
P
Mathieu
Mario
M
Sénéchal
Philippe
P
Pibarot
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001021:Aortic Valve / Q000503:physiopathology* / Q000601:surgery; D001024:Aortic Valve Stenosis / Q000401:mortality / Q000503:physiopathology* / Q000601:surgery; D002318:Cardiovascular Diseases / Q000401:mortality; D016022:Case-Control Studies; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011446:Prospective Studies; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013318:Stroke Volume / Q000502:physiology*; D016896:Treatment Outcome; D018487:Ventricular Dysfunction, Left / Q000503:physiopathology*