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Cerebral blood flow velocity during repeatedly induced ventricular fibrillation
1Department of Anesthesiology, St. Louis University Health Sciences Center, MO, USA.
Insights
Induced ventricular fibrillation and defibrillation during implantable cardioverter defibrillator placement did not harm cerebral blood flow (CBF). Transcranial Doppler monitoring showed CBF returned to normal levels after defibrillation, indicating no cumulative detrimental effects.
Area of Science:
- Cardiovascular Medicine
- Neuroscience
- Medical Device Technology
Background:
- Implantable cardioverter defibrillators (ICDs) require induced ventricular fibrillation (VF) and defibrillation.
- The impact of these procedures on cerebral blood flow (CBF) requires thorough investigation.
- Understanding CBF changes is crucial for patient safety during ICD implantation.
Purpose of the Study:
- To evaluate the effect of induced VF and defibrillation on CBF.
- To assess the efficacy of transcranial Doppler (TCD) in monitoring these changes.
- To determine if repeated procedures cause cumulative harm to cerebral circulation.
Main Methods:
- Prospective clinical study conducted at a university hospital.
- 12 patients (ASA physical status III and IV) undergoing ICD placement under general anesthesia.
- Cerebral blood flow velocity measured using TCD during induced VF and defibrillation.
Main Results:
- Mean flow velocity in the middle cerebral artery significantly decreased upon VF induction.
- CBF velocity returned to pre-VF levels immediately after successful defibrillation.
- Repeated VF/defibrillation episodes showed no cumulative detrimental effect on CBF velocity.
Conclusions:
- Induced VF and defibrillation during ICD insertion do not adversely affect CBF.
- TCD is a sensitive tool for detecting cerebral circulation changes during VF/defibrillation.
- These findings support the safety of current ICD implantation protocols regarding cerebral perfusion.
Study Objective:
To investigate the effect of induced ventricular fibrillation and defibrillation on cerebral blood flow (CBF) was investigated using a transcranial Doppler.
Design:
Prospective clinical study.
Setting:
University hospital.
Patients:
12 ASA physical status III and IV patients who underwent implantable cardioverter defibrillator placement during general anesthesia.
Interventions:
Cerebral blood flow velocity was measured repeatedly during induced ventricular fibrillation and subsequent defibrillation.
Measurements And Main Results:
The mean flow velocity in the middle cerebral artery was measured using a transcranial Doppler. The mean flow velocities decreased significantly immediately after ventricular fibrillation was induced, but they returned to preventricular fibrillation levels immediately after successful defibrillation. Repeatedly induced ventricular fibrillations have no cumulative detrimental effect on the CBF velocity.
Conclusions:
Repetitively induced ventricular fibrillation and defibrillation during the insertion of implantable cardioverter defibrillator did not show any detrimental changes in CBF. Transcranial Doppler may be a more sensitive device than other currently available cerebral monitors to detect changes in cerebral circulation during a brief episode of ventricular fibrillation and defibrillation.