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Subendocardial myocardial necrosis: a preventable lesion
Insights
Profound pericardial irrigation with cold Ringer's lactate effectively protected the heart during surgery, unlike hypothermia or Solumedrol alone. This finding supports a new clinical technique for myocardial preservation.
Area of Science:
- Cardiovascular Surgery
- Cardiac Physiology
- Experimental Pathology
Background:
- Left ventricular subendocardial hemorrhagic necrosis is a significant complication in open-heart surgery, particularly aortic valve replacement.
- This lesion differs from conventional myocardial infarction and contributes to patient morbidity and mortality.
- An established experimental calf model allows for consistent production of this lesion.
Purpose of the Study:
- To evaluate the protective efficacy of hypothermia and Solumedrol infusion against myocardial damage during cardiac surgery.
- To investigate the potential of profound continuous pericardial irrigation with cold Ringer's lactate solution for myocardial protection.
Main Methods:
- Utilized an experimental calf model to induce left ventricular subendocardial hemorrhagic necrosis.
- Compared the effects of systemic hypothermia and Solumedrol infusion versus continuous pericardial irrigation with 4°C Ringer's lactate.
- Assessed myocardial performance and preservation following 40 minutes of left coronary artery occlusion during cardiopulmonary bypass.
Main Results:
- Systemic hypothermia and Solumedrol infusion provided insufficient myocardial protection.
- Profound continuous irrigation of the pericardial cavity with cold Ringer's lactate solution demonstrated excellent myocardial performance and preservation.
- The addition of Solumedrol to pericardial irrigation did not significantly alter the protective effects.
Conclusions:
- Continuous pericardial irrigation with cold Ringer's lactate is a highly effective method for myocardial protection during cardiopulmonary bypass.
- This technique offers superior results compared to systemic hypothermia or Solumedrol infusion alone.
- The positive experimental findings have led to the adoption of this technique in clinical practice.
Abstract:
Left ventricular subendocardial hemorrhagic necrosis, a lesion entirely different from conventional myocardial infarction, has been an important cause of serious morbidity and mortality in open heart surgery, particularly aortic valve replacement. An established experimental model in which this lesion could be consistently produced in calves, was utilized to examine the protective role of hypothermia and/or Solumedrol infusion. Solumedrol infusion and systemic hypothermia were not sufficiently effective in protecting the myocardium against 40 minutes of left coronary artery occlusion during total cardiopulmonary bypass. Profound continuous irrigation of the pericardial cavity with 4 degrees centigrade Ringers lactate solution, with or without Solumedrol infusion, under similar circumstances yielded excellent results, both in terms of myocardial performance and preservation. This experiment has encouraged the clinical use of this technique in our institution.