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Dominant hemodynamic parameters of chronic ischemic mitral regurgitation
D Debeljacki1, D Benc, G Panić
1Institut za kardiovaskularne bolesti, Sremska Kamenica, Medicinski fakultet, Novi Sad.
Insights
Post-myocardial infarction mitral regurgitation, common in patients with coronary artery disease, significantly impairs diastolic function. Pulmonary resistance and left atrial size are key indicators of severity.
Area of Science:
- Cardiology
- Cardiovascular Diseases
- Internal Medicine
Background:
- Posteroinferior myocardial infarction can lead to complications such as mitral regurgitation.
- Mitral regurgitation severity varies, impacting cardiac function.
- Understanding the hemodynamic consequences is crucial for patient management.
Purpose of the Study:
- To investigate the hemodynamic and echocardiographic characteristics of patients with postinfarction mitral regurgitation.
- To correlate the degree of mitral regurgitation with specific hemodynamic and echocardiographic parameters.
- To identify sensitive markers for assessing mitral regurgitation severity after myocardial infarction.
Main Methods:
- 128 patients treated for posteroinferior myocardial infarction were divided into two groups: with (Group I) and without (Group II) mitral regurgitation.
- Hemodynamic measurements (pulmonary pressures, left ventricular end-diastolic pressure) and transthoracic echocardiography were performed.
- Patients were classified based on the Sellers scale for mitral regurgitation severity.
Main Results:
- Group I patients showed significantly impaired diastolic function compared to Group II, despite similar systolic function.
- A positive correlation was found between the degree of mitral regurgitation and pulmonary capillary/total pulmonary resistance.
- Left atrial size was identified as the most sensitive echocardiographic parameter for assessing mitral regurgitation severity.
Conclusions:
- Postinfarction mitral regurgitation, averaging Grade II in this cohort, is associated with impaired diastolic function.
- Total and capillary pulmonary resistance are the most sensitive hemodynamic parameters for evaluating mitral regurgitation severity.
- Left atrial dimension is the most sensitive echocardiographic marker for assessing the severity of postinfarction mitral regurgitation.
Abstract:
The study included 128 patients treated at the Institute of Cardiovascular Diseases in Sremska Kamenica within a year after the first posteroinferior myocardial infarction. On the basis of hemodynamic measurements, patients were divided into 2 groups. Group I (examinees) included 64 patients (58 males and 6 females, mean age 54.42 +/- 6.70 years) with proven mitral regurgitation and group 2 (control) included 64 patients (56 males and 8 females, mean age 51.71 +/- 8.84 years) without mitral regurgitation, but with stenotic changes in the right coronary artery and left circumflex coronary artery without significant stenotic lesions at the anterior descending left coronary artery. According to Sellers classification mitral regurgitation in group I was as follows: I grade 37.5%, II grade 31.3%, III grade 21.9% and IV grade 9.3%. Measured hemodynamic parameters in basal conditions (systolic, diastolic and mean pulmonary pressure, capillary pulmonary pressure and wave V, left ventricular end-diastolic pressure) point to significant impairment of diastolic function in group I apart from similar values of systolic function (cardiac output, cardiac index and ejection fraction). Dimension of the left atrium and left ventricle determined by transthoracic echocardiography confirm this. There was a positive correlation of examined parameters (pulmonary capillary and total pulmonary resistance) and the degree of mitral regurgitation, as well as the correlation between the degree of mitral regurgitation and hemodynamic parameters. It may be concluded that postinfarction mitral regurgitation in examined patients is of II degree on the average; total and capillary pulmonary resistance are most sensitive hemodynamic parameters for examining the severity of mitral regurgitation, whereas the size of the left atrium is the most sensitive echocardiographic parameter.