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Risk factors associated with vasovagal reactions during colonoscopy
L L Herman1, R C Kurtz, K J McKee
1Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, New York 10021.
Gastrointestinal Endoscopy
|May 1, 1993
Summary
Vasovagal reactions during colonoscopy are defined by specific physiological changes. Moderate to severe diverticulosis and higher midazolam doses were identified as risk factors for these events.
Area of Science:
- Gastroenterology
- Cardiology
Background:
- Vasovagal reactions can complicate medical procedures.
- Understanding risk factors for vasovagal reactions during colonoscopy is crucial for patient safety.
Purpose of the Study:
- To define vasovagal reactions during colonoscopy.
- To identify risk factors associated with vasovagal reactions in patients undergoing colonoscopy.
Main Methods:
- Prospective evaluation of 223 consecutive patients undergoing colonoscopy with monitored sedation.
- Vasovagal reaction defined by diaphoresis, bradycardia (<60 bpm or 10% decrease), or hypotension (<90/60 mmHg or 10% decrease).
- Comparison of demographic, clinical, and procedural factors between patients with and without vasovagal reactions.
Main Results:
- 16.5% (37/223) of patients experienced a vasovagal reaction.
- No significant differences in demographics, comorbidities, or procedure success between groups.
- Higher midazolam dosage (4.6 vs 3.9 mg) and moderate to severe diverticulosis (43% vs 16%) were associated with vasovagal reactions.
- 13 patients (35% of those with reaction) required medical intervention.
Conclusions:
- Vasovagal reactions during colonoscopy are characterized by specific hemodynamic and autonomic changes.
- Moderate to severe diverticulosis and increased midazolam administration are significant risk factors.
- These findings can inform strategies to mitigate vasovagal reactions during colonoscopy.