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Cerebral damage following open-heart surgery in deep hypothermia and circulatory arrest
Insights
Aortic arch surgery during deep hypothermia can cause severe brain damage. Postoperative monitoring of intracranial pressure and cerebral perfusion is crucial for patients undergoing aortic arch replacement.
Area of Science:
- Cardiovascular Surgery
- Neurology
- Critical Care Medicine
Background:
- Aortic arch replacement under deep hypothermia and circulatory arrest is a complex procedure.
- Cerebral complications can significantly impact patient outcomes following this surgery.
Purpose of the Study:
- To investigate the incidence and severity of cerebral damage in patients undergoing aortic arch replacement.
- To evaluate the utility of monitoring intracranial pressure, cerebral perfusion pressure, and cerebrospinal fluid creatine kinase (CK) activity.
Main Methods:
- Serial cerebrospinal fluid (CSF) creatine kinase (CK) activity measurements.
- Intracranial epidural pressure and cerebral perfusion pressure monitoring.
- Clinical neurological evaluation and autopsy findings.
Main Results:
- Two of four monitored patients showed marked increases in intracranial pressure postoperatively.
- One patient developed brain tamponade despite aggressive medical management.
- Patients undergoing aortic arch replacement exhibited more severe cerebral damage compared to other cardiac surgeries.
Conclusions:
- Aortic arch replacement carries a significant risk of severe cerebral damage.
- Postoperative neuro-intensive monitoring and care are essential for high-risk patients.
- Cerebral perfusion pressure monitoring and Doppler flow velocity studies offer valuable insights into cerebral circulatory status.
Abstract:
Six patients undergoing aortic arch replacement during deep hypothermia and circulatory arrest were subjected to studies including serial determinations of total creatine kinase (CK) activity in the cerebrospinal fluid (CSF), monitoring of the intracranial epidural pressure and the cerebral perfusion pressure and clinical neurological evaluation. In two of four patients with postoperative pressure monitoring, a marked increase in pressure was seen. In one case this pressure rise terminated in brain tamponade six days postoperatively, despite aggressive treatment with steroids, mannitol and barbiturate. In comparison with patients undergoing surgery for valve replacement or aorto-coronary by-pass, some of the patients with aortic arch replacement clearly sustained more severe cerebral damage, as judged by clinical examination and autopsy findings as well as by assessment of the degree or extent of the neuronal damage from CK activity in CSF. Patients of this type are obvious candidates for postoperative neuro-intensive monitoring and care. Repeated pulsed Doppler flow velocity determinations in precerebral arteries, performed bedside, combined with monitoring of the cerebral perfusion pressure, provide a useful indication of the cerebral circulatory state in such situations.