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Pre-operative oximetry and capnometry: potential respiratory screening tools
F E Block1, K M Reynolds, T Kajaste
1Department of Anesthesiology, Ohio State University, Columbus 43210, USA.
International Journal of Clinical Monitoring and Computing
|August 1, 1996
Summary
Pre-operative pulse oximetry and capnography can screen surgical patients for pulmonary issues. Routine screening of oxygen saturation and end-tidal carbon dioxide in unmedicated patients may identify airway obstruction before anesthesia.
Area of Science:
- Anesthesiology
- Pulmonary Medicine
- Surgical Patient Evaluation
Background:
- Increasing outpatient and same-day surgical admissions challenge thorough pre-operative pulmonary evaluation.
- Standard pre-operative assessments may not adequately identify patients with underlying pulmonary conditions.
Purpose of the Study:
- To assess the utility of pre-operative pulse oximetry and capnography as pulmonary screening tools.
- To identify potential pulmonary abnormalities in unmedicated surgical patients before anesthesia induction.
Main Methods:
- A preliminary study involving 200 unselected, unmedicated adult surgical patients.
- Utilized a dual-parameter patient monitor for pulse oximetry (oxygen saturation) and capnography (end-tidal carbon dioxide and capnogram).
Main Results:
- Oxygen saturation below 94% was observed in 5% of patients.
- End-tidal carbon dioxide of 45 mmHg or higher (indicating elevated arterial CO2) was found in 5% of patients.
- Abnormal capnogram shapes, suggestive of mild to moderate airway obstruction, were detected in 46% of patients.
Conclusions:
- Pre-operative pulse oximetry and capnography can serve as valuable screening tools in unmedicated patients.
- Routine pre-admission measurement of these parameters may help detect pulmonary abnormalities missed after sedation or anesthesia induction.