Update on transient cardiac standstill in cerebrovascular surgery
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Published on: August 11, 2023
Leonardo Rangel-Castilla1, Jonathan J Russin, Gavin W Britz
1Division of Neurological Surgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA.
Insights
Transient cardiac standstill techniques, including deep hypothermia and adenosine, aid complex aneurysm surgery. Rapid ventricular pacing offers a predictable alternative, but all methods require neurosurgeon expertise.
Area of Science:
- Neurosurgery
- Cardiovascular Surgery
- Anesthesiology
Background:
- Transient cardiac standstill is crucial for complex cerebral aneurysm microsurgery, offering improved surgical exposure and decompression.
- Deep hypothermia with circulatory arrest provides cerebroprotection but carries high risks, limiting its use to specific complex cases.
- Adenosine-induced asystole and rapid ventricular pacing (RVP) are alternative techniques with distinct advantages and disadvantages.
Purpose of the Study:
- To review and compare techniques for inducing transient cardiac standstill in cerebrovascular surgery.
- To highlight the applications, benefits, and limitations of deep hypothermia, adenosine, and RVP.
- To emphasize the importance of neurosurgeon familiarity with these procedures.
Main Methods:
- Review of existing literature on deep hypothermia, adenosine-induced asystole, and RVP in cerebrovascular surgery.
- Comparative analysis of the predictability, invasiveness, and potential complications of each technique.
- Discussion of the clinical scenarios and patient populations best suited for each method.
Main Results:
- Deep hypothermia offers optimal conditions but is high-risk and resource-intensive.
- Adenosine is easily applied but has unpredictable dosing and risk of hypotension.
- RVP is predictable and less hypotensive than adenosine but more invasive and complex.
Conclusions:
- Each transient cardiac standstill technique has unique benefits and drawbacks for aneurysm surgery.
- The choice of technique depends on aneurysm complexity, surgical urgency, and available resources.
- Vascular neurosurgeons must understand these methods to optimize patient care and surgical outcomes.
Abstract:
Transient cardiac standstill is a complementary procedure used with microsurgery to treat patients with particularly complex aneurysms, such as large or giant cerebral aneurysms. These procedures allow the aneurysms to be decompressed while maintaining a bloodless field and increased surgical exposure. Deep hypothermia combined with circulatory arrest provides cerebroprotection with optimal surgical conditions. However, its disadvantage is the relatively high risk of the procedure, which requires extensive expertise and infrastructure. Thus, its use is typically limited to patients with complex posterior circulation aneurysms. Adenosine-induced transient asystole is an easily applied technique in a variety of clinical situations. Its use requires minimal advanced preparation and no complex logistical coordination with other subspecialties. However, patient-specific dose-response relationships must be determined by exposure, so the relationship may not be known in an emergent situation. Persistent hypotension is a potentially major complication. Rapid ventricular pacing (RVP) has recently been reintroduced into cerebrovascular surgery. It is more predictable than adenosine in response time and, thus, can be used during unanticipated complications, such as aneurysmal rupture. It also induces a shorter period of hypotension compared with adenosine. However, RVP is more invasive and more complex from an anesthesia standpoint. Vascular neurosurgeons should be familiar with these techniques and know their applications and limitations.
