Pulse carboxyhemoglobin-oximetry and cigarette smoking

Area of Science:

• Clinical Chemistry
• Pulmonary Medicine
• Public Health

Background:

• Accurate smoking status assessment is crucial for clinical decisions and public health research.
• Self-reported smoking data often lacks accuracy.
• Carboxyhemoglobin (COHb) levels are a biomarker of recent smoking.

Purpose of the Study:

• To evaluate the utility of a pulse carbon monoxide (CO)-oximeter for determining smoking status.
• To assess if CO-oximetry can enhance the accuracy of self-reported smoking data in surveys.

Main Methods:

• Thirty-four healthy volunteers (22 smokers, 12 non-smokers) were recruited.
• Carboxyhemoglobin (COHb) levels were measured using a pulse CO-oximeter (Masimo, Radical 7).
• Nicotine dependency was assessed using the modified Fagerstrom questionnaire.

Main Results:

• COHb levels significantly increased in both light and moderate/heavy smokers after a single cigarette.
• Elevated COHb persisted for over 6 hours in moderate/heavy smokers and 1 hour in light smokers.
• Pulse rate increased significantly in smokers 20 minutes post-smoking.

Conclusions:

• Pulse CO-oximetry can detect recent smoking (within 6 hours for heavy smokers, 20 minutes for light smokers).
• This device can serve as a validation tool for smoking status, particularly in clinical settings like surgical admissions.
• The noninvasive, simple, and inexpensive nature of CO-oximetry makes it suitable for improving smoking survey accuracy.