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Blood pressure control during eye surgery under local anesthesia using pulse oximetry
Summary
Nitroglycerin (NTG) minimally impacts oxygen saturation during cataract surgery. While generally safe, consider prophylactic oxygen for patients with lung or heart conditions.
Area of Science:
- Anesthesiology
- Ophthalmology
- Cardiology
Background:
- Cataract surgery under local anesthesia can induce hypertension.
- Monitoring blood pressure and oxygen saturation is crucial in elderly patients.
Purpose of the Study:
- To evaluate the effect of nitroglycerin (NTG) on arterial blood pressure and oxygen saturation in elderly patients undergoing cataract surgery.
- To determine the safety and efficacy of NTG in managing intraoperative hypertension.
Main Methods:
- Arterial blood pressure and SpO2 were measured in 39 elderly patients (70-89 years).
- Systolic arterial pressure (SAP) elevations were treated with intravenous NTG (bolus and infusion).
- Changes in SpO2 were monitored during NTG administration.
Main Results:
- Nineteen patients experienced a ≥20% increase in SAP.
- NTG effectively reduced SAP.
- A statistically significant but clinically irrelevant decrease in SpO2 was observed in most patients breathing room air.
- Two patients showed a severe SpO2 decrease.
Conclusions:
- NTG is generally safe and does not typically cause severe oxygen desaturation in this population.
- Prophylactic oxygen administration may be advisable for patients with severe lung dysfunction or ischemic heart disease.
- NTG can be a useful tool for managing intraoperative hypertension during cataract surgery.