Aortic stenosis with severe left ventricular dysfunction and low transvalvular pressure gradients - Risk stratification by low-dose dobutamine echocardiography
Jl. Monin et al., Aortic stenosis with severe left ventricular dysfunction and low transvalvular pressure gradients - Risk stratification by low-dose dobutamine echocardiography, J AM COL C, 37(8), 2001, pp. 2101-2107
Citations number
27
Categorie Soggetti
Cardiovascular & Respiratory Systems","Cardiovascular & Hematology Research
OBJECTIVES We sought to assess risk stratification by using dobutamine stre
ss echocardiography (DSE) in patients with aortic stenosis (AS) and severe
left ventricular (LV) dysfunction.
BACKGROUND Few data are available on risk stratification for valve replacem
ent in patients with AS, LV dysfunction and low transvalvular gradients.
METHODS Low-dose DSE was performed in 45 patients (16 women and 29 men; med
ian [quartile range] age in years: 75 [69 to 79]; left ventricular ejection
fraction: 0.29 [0.23 to 0.32]; aortic valve area [cm(2)]: 0.7 [0.5 to 0.8]
; mean transaortic gradient [mm Hg]: 26 [21 to 33]). Patients were classifi
ed into two groups: group I (n = 32, LV contractile reserve on DSE) and gro
up II (n = 13, no contractile reserve). Valve replacement was performed in
24 and 6 patients in groups I and II, respectively.
RESULTS Perioperative mortality was 8% in group I and 50% in group II (p =
0.014). Survival at five years after the operation was 88% in group I. Comp
ared with medical therapy, valve surgery was associated with better long te
rm survival in group I (hazard ratio for death [HR-D] 0.13, 95% confidence
interval [CI] 0.002 to 0.49) and reduced survival in group II (HR-D 19.6, 9
5% CI 2.7 to 142). The effect of valve surgery on survival remained signifi
cant in both groups after adjustment for age, diabetes, respiratory disease
and hypertension. Medical therapy had the same effect in both groups.
CONCLUSIONS In patients with AS, LV dysfunction and low transvalvular gradi
ents, contractile reserve on DSE is associated with a low operative risk an
d good long-term prognosis after valve surgery. In contrast, operative mort
ality remains high in the absence of contractile reserve. (J Am Coll Cardio
l 2001;37:2101-7) (C) 2001 by the American College of Cardiology.