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[Myocardial function of the right ventricle in coronary disease]
Insights
Coronary artery disease affecting the right coronary artery significantly impairs right ventricular function, even in patients with healed myocardial infarction. This study highlights the impact of right coronary artery stenosis on right ventricular performance.
Area of Science:
- Cardiology
- Cardiovascular Physiology
- Myocardial Infarction Research
Context:
- Assessing cardiac function post-myocardial infarction (MI) is crucial for understanding long-term outcomes.
- Right ventricular (RV) dysfunction can complicate recovery from MI, particularly when the right coronary artery (RCA) is involved.
- Evaluating RV and left ventricular (LV) hemodynamics provides insights into overall cardiac performance.
Purpose:
- To investigate the functional impact of proximal severe stenosis of the right coronary artery on right and left ventricular performance in patients with healed myocardial infarction.
- To compare RV and LV volumes, ejection fractions, pressures, and myocardial shortening velocities between patients with and without significant RCA disease.
- To determine if RCA disease leads to impaired RV function despite normal RV pressures and preserved LV hemodynamics.
Summary:
- Nineteen patients with healed MI and normal RV pressures were divided into two groups based on RCA status: Group A (stenosis) and Group B (no disease).
- While LV hemodynamics were similar, Group A exhibited significantly higher LV end-diastolic volume (LVEDV), RV end-diastolic volume (RVEDV), and RV end-diastolic pressure (RVPED).
- Group A showed significantly impaired RV ejection fraction (RVEF) and RV velocity of diameter shortening (VD) compared to Group B, indicating compromised RV function due to RCA disease.
Impact:
- Coronary artery disease affecting the RCA significantly impairs RV myocardial function.
- This finding underscores the importance of considering RCA involvement in the assessment and management of patients with myocardial infarction.
- Understanding the specific impact on RV function can guide therapeutic strategies and improve patient prognosis.
Abstract:
In 19 patients with healed myocardial infraction and normal right ventricular pressures, right and left ventricular volumes (biplane cineangio), ejection fractions and pressures were measured. Twelve of the patients had proximal severe stenosis of the right coronary artery (Group A), which was not diseased in seven patients (Group B). RV mean velocity of diameter shortening (VD) and LV mean velocity of circumferential fiber shortening Vcf) were calculated. Group A and B had similar RV systolic pressures (26.3 +/- 1.0 and 24.7 +/- 2.1 mm Hg) and LV hemodynamics (LVP: 127.5 +/- 5.9 and 122.1 +/- mm Hg, LVPED: 13.1 +/- 1.0 and 13.9 +/- 1.0 mm Hg, LVEF: 45.3 +/- 3.8 and 48.4 +/- 4.6%, Vcf: 0.768 +/- 0.114 and 0.861 +/- 0.123 circ/s). Only LVEDV was significantly higher in Group A (135.3 +/- 6.0 and 103.7 +/- 5.4 ml/m2). RVEDV (Group A: 131.4 +/- 4.5 and Group B: 87.9 +/- 4.8 ml/m2), RVEF (48.8 +/- 1.9 and 56.0 +/- 1.0%), RVPED (6.1 +/- 0.8 and 4.0 +/- 0.4 mm Hg) and VD (0.628 +/- 0.049 and 1.073 +/- 0.082 D/s) indicated significantly impaired RV function in Group A. It can be concluded that coronary artery disease of the right coronary causes significant functional impairment of the right ventricular myocardium.