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[Valve replacement, a possible factor in myocardial deterioration]
Insights
Cardiopulmonary bypass (CPB) may cause myocardial damage in valve replacement patients. Careful assessment is needed to attribute cardiac dysfunction to CPB, excluding other causes.
Area of Science:
- Cardiology
- Cardiac Surgery
Background:
- Cardiopulmonary bypass (CPB) is a standard procedure in valve replacement surgery.
- Myocardial damage can occur post-CPB, but its attribution requires careful evaluation.
Observation:
- Four cases (0.25%) of myocardial damage potentially linked to CPB during valve replacement are presented.
- Detailed case studies illustrate left ventricular (LV) dysfunction, including dilatation and reduced ejection fraction, post-CPB.
Findings:
- LV deterioration was observed in patients undergoing valve replacement, with CPB suspected as a contributing factor in specific instances.
- Excluding prosthetic dysfunction, associated lesions, or coronary artery disease is crucial for attributing myocardial damage to CPB.
- The influence of altered cardiac load post-correction of valvular disease complicates the interpretation of LV function changes.
Implications:
- This highlights the need for rigorous myocardial protection strategies during CPB.
- Further research is warranted to precisely define the role of CPB in post-operative myocardial dysfunction.
- Improved patient selection and surgical techniques may mitigate CPB-associated risks.
Abstract:
Cardiopulmonary bypass (CPB) may be a cause of myocardial damage in a small number of patients undergoing valve replacement (4 out of 1576 valve replacements). The responsibility of CPB can only be presumed when: the degree of myocardial dysfunction after surgery can be quantified, other causes of myocardial dysfunction are excluded. the type of valvular disease is taken into consideration. Variations in load after correction of certain lesions (mitral regurgitation) makes changes of LV systolic function difficult to interpret. The first case concerned a 23 year old patient operated for aortic regurgitation (Björk prosthesis) under local and general hypothermia and followed-up for 1 year after surgery. Ventricular extrasystoles and left bundle branch block were observed during surgery and radiological and echocardiographic LV dilatation persisted with deterioration of echographic, isotopic, haemodynamic and angiographic parameters of LV function: ejection fraction fell from 62% before surgery to 35% with diffuse hypokinesia and persistent LV dilatation (191 vs 188 ml). In the absence of prosthetic valve dysfunction, associated valve lesions or coronary artery disease, LV deterioration was attributed to CPB and inadequate myocardial protection. In two other cases (60 and 62 years) correction of aortic stenosis (Starr 1260) with coronary perfusion was followed by cardiac failure with left bundle branch block, deterioration of LV function, and death after 3 years in one case and precarious survival at 10 years in the other. In a fourth case (mixed mitral valve disease corrected by a Starr prosthesis under aortic clamping), the variation of cardiac load before and after surgery made changes in LV function difficult to interpret. (ABSTRACT TRUNCATED AT 250 WORDS)