Introduction: Atrial functional mitral regurgitation (AFMR) remains poorly defined clinically. Aim: To compare clinical, echocardiographic characteristics and outcomes of severe AFMR to primary mitral regurgitation (PMR) after mitral valve annuloplasty (MVA) via right minithoracotomy approach (RMA)
Methods: Consecutive patients, who underwent MVA by RMA at our institution between 2016 and 2021 for severe mitral regurgitation with preserved left ventricular function, were screened. We excluded endocarditis, cardiomyopathy, prior mitral intervention. The absence of leaflet pathology defined AFMR. Outcomes included death and heart failure hospitalizations (HFH)
Results: 154 MVA were performed. After excluding 11 patients, among the remaining 143, AFMR were diagnosed in 24 patients, PMR in 119 patients. Compared to PMR, patients with AFMR were older (p 0,002), female (p 0,003), with worst New York Heart Association functional class (p 0,0072), with more comorbidities, including hypertension (p 0.00015) and atrial fibrillation (p 0.00001), higher left atrium volume (p 0,000004), higher average E/e' (p 0.0003) and more frequent severe tricuspid regurgitation (p 0,00001). During the follow up (38±13 mounths), 24 patients were lost and 5 patients died (4,3% in the AFMR group, 4% in PMR group). Patients with AFMR and PMR, treated by annuloplasty, had the same survival rate (log-rank p 0.09). No HFH were registered
Conclusions: AFMR is characterized by an unfavorable cardiovascular background. An early surgery correction could improve survival of these patients.
All (n=143) | AFMR (n=24) | PMR (n=119) | P | |
---|---|---|---|---|
Baseline characteristics | ||||
Age, Years | 63,7±11,5 | 70,2±9,2 | 62,3±11,5 | 0,02 |
BMI, Kg/m2 | 25,8±4,0 | 26,5±5,0 | 25,7±3,7 | 0,43 |
Female | 66 (46,2%) | 18(75%) | 48 (40,4%) | 0,003 |
Smokers | 53 (37,1%) | 8 (33,3%) | 45 (37,8%) | 0,818 |
NYHA class | 0,0072* | |||
- I | 0 | 0 | 0 | - |
- II | 46(32,2%) | 2 (8,3%) | 44(37,0%) | - |
- III | 75 (52,4%) | 19 (79,2%) | 56 (47,0%) | - |
- IV | 22 (15,4%) | 3 (12,5%) | 19(16,0%) | - |
Atrial fibrillation | 37 (25,9%) | 19(79,2%) | 18(15,1%) | 0,00001 |
Arterial Hypertension | 77 (53,8%) | 20 (83,3%) | 57 (47,9%) | 0,0015 |
Dyslipidemia | 37 (25,9%) | 5 (20,8%) | 32 (26,9%) | 0,6183 |
Coronary Artery Disease | 52 (36,4%) | 9(20,8%) | 43(36,1%) | 1 |
Diabetes mellitus | 11 (7,7%) | 4(16,7%) | 7 (5,9%) | 0,0892 |
Echocardiographic Characteristics | ||||
Ejection fraction, % | 66,2±6,9 | 60,7±6,6 | 67,3±6,4 | 0,09 |
End Diastolic Volume, ml | 140,6±39,8 | 125,0±29,7 | 146,0±41,5 | 0,02 |
End systolic Volume, ml | 47,5±18,7 | 54,7±25,4 | 45,1±15,2 | 0,065 |
Severe Tricuspide Regurgitation | 20 (14,0%) | 17 (70,8%) | 3 (2,5%) | 0,00001 |
Anteroposterior Diameter of left atrium, mm | 47,4±8,3 | 51,9±8,6 | 46,5±7,9 | 0,002747 |
Left atrium volume, ml | 73,4±31,4 | 93,3±15,8 | 69,7±32,2 | 0,000004 |
E/e’ | 15,2±2,5 | 18,S±3,0 | 14,7±2,6 | 0,0003 |