Related Experiment Videos
Postoperative management of cerebral air embolism: gas physiology for surgeons
E A Tovar1, C Del Campo, A Borsari
1Division of Cardiovascular Surgery, St. Jude Medical Center, Fullerton, California, USA.
Abstract:
Cerebral gaseous microemboli are present in most, if not all, cardiopulmonary bypass-assisted operations. Fortunately, the great majority are subclinical. Clinically significant cases of cerebral air embolism are largely underdiagnosed, undertreated, and underreported. The management of cerebral air embolism has been challenged due to the lack of prospective, randomized studies. Preventive measures that have been implemented throughout the years, resulting from empirically acquired knowledge, have avoided frequent major mishaps. Perfusion accidents, in which massive amounts of gas are pumped into patients, are managed intraoperatively by common-sense heroic measures which, at best, remove 50% of the embolized gas. Postoperative confirmation of a neurologic insult after a cardiopulmonary bypass-assisted operation, in which a cerebral air embolism is likely the source, is one of the most distressing situations a surgical team has to confront, due in part to the lack of pathognomonic diagnostic tools and to the absence of a "scientifically proven" (supported by prospective, randomized studies) therapeutic regimen. In lieu of the latter, we present the physical and physiologic bases that will justify the use of several therapeutic tools when facing a suspected CAE. These tools, when applied rationally, will represent some of the most innocuous modalities in the medical armamentarium.
Insights
Cerebral air embolism (CAE) is common during cardiopulmonary bypass but often subclinical. Management is challenging due to limited evidence, yet rational application of existing tools can mitigate risks.
Area of Science:
- Neurology
- Cardiovascular Surgery
- Medical Engineering
Background:
- Cerebral gaseous microemboli are a frequent complication of cardiopulmonary bypass (CPB).
- Most microemboli are subclinical, but clinically significant cerebral air embolism (CAE) is underdiagnosed and undertreated.
- Current management strategies lack robust evidence from prospective, randomized studies.
Observation:
- CPB-assisted operations commonly involve gaseous microemboli.
- Massive gas embolism during CPB requires intraoperative intervention, often removing only 50% of the gas.
- Postoperative neurological deficits after CPB raise concerns for CAE as the cause.
Findings:
- The diagnosis and treatment of CAE are hindered by a lack of specific diagnostic tools and evidence-based therapeutic guidelines.
- Empirically developed preventive measures have successfully reduced major complications.
- Intraoperative management of massive gas embolism relies on "heroic measures" with limited efficacy.
Implications:
- Understanding the physical and physiological basis of CAE is crucial for effective management.
- Rational application of available therapeutic tools, though not rigorously proven, offers innocuous treatment options.
- Further research is needed to develop evidence-based therapeutic regimens for CAE.