European Heart Journal Advance Access originally published online on October 30, 2007
European Heart Journal 2007 28(23):2866-2872; doi:10.1093/eurheartj/ehm469
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Functional mitral regurgitation after a first non-ST-segment elevation acute coronary syndrome: contribution to congestive heart failure
Unidad de Imagen Cardiovascular, Instituto Cardiovascular, Hospital Clínico San Carlos, Plaza Cristo Rey, 28040 Madrid, Spain
Received 28 May 2007; revised 15 September 2007; accepted 24 September 2007; online publish-ahead-of-print 30 October 2007.
* Corresponding author. Tel: +34 913303290; fax: +34 913303290. E-mail address: jlzamorano{at}vodafone.es
Aims: Functional mitral regurgitation (MR) is a frequent complication after the acute phase of a myocardial infarction and plays an important role in the development of congestive heart failure (CHF) after a Q-wave myocardial infarction. Nevertheless, until now, the relevance of functional MR after a non-ST-segment elevation acute coronary syndrome (NSTSEACS) has been poorly addressed. Our aim was to assess the relationship between the presence or absence and the severity of functional MR after a first NSTSEACS and the development of CHF.
Methods and results: Two hundred and seventy-nine patients discharged from hospital in NYHA functional classes I and II (71.7% men; mean age 66.3 ± 13.2 years) after a first NSTSEACS were studied. Every patient underwent an echocardiographic study during the first week after the index NSTSEACS and were clinically followed-up. MR was detected in 40.1% patients. Patients were followed-up for a median time of 418 days (inter-quartile range: 295–561). Six patients (3.6%) in the group without MR and 15 patients (13.4%) in the group with MR required hospitalization due to CHF during follow-up. Only MR was found as an independent predictor of CHF development (HR = 1.8; 95% CI = 1.1–3.1; P = 0.02) and CHF development or cardiac death (HR = 2.1; 95% CI = 1.3–3.3; P = 0.01) in the long-term follow-up multivariable Cox regression analysis.
Conclusion: There is an increased risk for subsequent CHF in patients with MR after a first NSTSEACS. The risk of CHF is closely related to the MR presence and severity. Thus, the detection of MR by means of Doppler echocardiography after a first episode of NSTSEACS is crucial.
Key Words: Mitral regurgitation Non-ST-segment elevation acute coronary syndrome Congestive heart failure
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