Key result
Mitral valve repair for atrial functional mitral regurgitation significantly reduced mean left atrial dimension from 60 mm to 54 mm, though recurrent regurgitation occurred with LV dilatation.
Why the study?
Data assessing outcomes of mitral ring annuloplasty alone for atrial functional mitral regurgitation are limited.
Observational (n=40)
No
Mitral valve repair for atrial functional mitral regurgitation provides acceptable midterm freedom from heart failure readmission, though recurrent MR is more common in patients with preoperative LV dilatation.
Answers are grounded in this paper and cite their sources.
May support mitral valve repair in atrial functional MR; leaves open whether preoperative LV dilatation should guide selection.
Background: Annular dilation by left atrial remodeling is considered the main cause of atrial function mitral regurgitation. Although acceptable outcomes have been obtained using mitral ring annuloplasty alone for atrial functional mitral regurgitation, data assessing outcomes of this procedure are limited. Therefore, we aimed to assess midterm outcomes of mitral valve repair in patients with atrial functional mitral regurgitation.Methods: We retrospectively studied 40 patients (mean age: 69 ± 9 years) who had atrial fibrillation that persisted for >1 year, preserved left ventricular ejection fraction of >40%, and mitral valve repair for atrial functional mitral regurgitation. The mean clinical follow-up duration was 42 ± 24 months.Results: Mitral ring annuloplasty was performed for all patients. Additional repair including anterior mitral leaflet neochordoplasty was performed for 22 patients. Concomitant procedures included maze procedure in 20 patients and tricuspid ring annuloplasty in 31 patients. Follow-up echocardiography showed significant decreases in left atrial dimensions and left ventricular end-diastolic dimensions. Recurrent mitral regurgitation due to ring detachment or leaflet tethering was observed in five patients and was seen more frequently among those with preoperative left ventricular dilatation. Three patients without tricuspid ring annuloplasty or sinus rhythm recovery by maze procedure developed significant tricuspid regurgitation. Five patients who underwent the maze procedure showed sinus rhythm recovery. Rates of freedom from re-admission for heart failure at 1 and 5 years after surgery were 95% and 86%, respectively.Conclusions: Mitral valve repair is not sufficient to prevent recurrent atrial functional mitral regurgitation in patients with preoperative left ventricular dilatation. Tricuspid ring annuloplasty may be required for long-term prevention of significant tricuspid regurgitation.
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Kaneyuki et al. (2020) conducted an observational in Atrial functional mitral regurgitation (n=40). Mitral valve repair (mitral ring annuloplasty) vs. Preoperative baseline was evaluated on Mean left atrial dimension (mm) (p=<0.001). Mitral valve repair for atrial functional mitral regurgitation significantly reduced mean left atrial dimension from 60 mm to 54 mm, though recurrent regurgitation occurred with LV dilatation.
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