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[Right ventricular function in patients with poor left ventricular function: studies in patients undergoing coronary
Y Konishi1, M Matsumoto, S Miwa
1Cardiovascular Surgery, Japan Red Cross Society, Wakayama Medical Center, Japan.
Kyobu Geka. the Japanese Journal of Thoracic Surgery
|December 1, 1996
Summary
Left ventricular dysfunction impacts right ventricular (RV) function differently based on infarction location. Anterior infarction had minimal RV effect, while inferior infarction led to persistent RV dysfunction.
Area of Science:
- Cardiology
- Cardiac Surgery
- Heart Function
Background:
- Right ventricular (RV) dysfunction often stems from RV infarction but can also be secondary to left ventricular (LV) dysfunction.
- Understanding the impact of LV dysfunction on RV function is crucial for patient management.
Purpose of the Study:
- To clarify how poor LV function influences RV function.
- To evaluate the effect of LV infarction location on RV ejection fraction (RVEF).
Main Methods:
- Serial evaluation of RV ejection fraction (RVEF) using thermodilution techniques.
- Patients with LVEF < 40% undergoing aorto-coronary bypass surgery were grouped by LV infarction site (anterior, inferior, anterior + inferior, none).
- A control group with LVEF > 60% and no significant right coronary artery stenosis was included.
Main Results:
- Groups with inferior or anterior + inferior LV infarction showed significantly lower pre- and postoperative RVEF compared to controls.
- Patients with anterior LV infarction maintained almost normal RVEF.
- No significant differences in cardiac index, intracardiac pressures, or catecholamine use were observed between groups.
Conclusions:
- RV dysfunction associated with inferior infarction persists long-term.
- Low LVEF resulting from anterior infarction has minimal impact on RV function.
- Infarction location significantly influences the relationship between LV and RV function.