Abstract
Background: Hypoxemia is a serious situation; physical examination alone is insufficient to detectoxygenation failure. As oxygenation requirements are largely determined by pulse oximetry, vs. arterial blood gas, which is invasive and not a real-time technique. Various parameters are known to have effects on pulse oximetry values other than various disease processes. Before interpreting an abnormal pulse oximetry value, it will be prudent to know the effects of those personal parameters.
Methods: We sought to determine the distribution of oximetry (SpO2) values in awake, asymptomatic adults, and the effect of personal characteristics like smoking, gender, respiratory rate, blood pressure, and body mass index (BMI) on these values.
It is a prospective cross-sectional study, sampling oximetry readings in adults without acute cardiac or pulmonary disease, who had no history of chronic lung disease. Participants were invited to participate if they were in normal health, as we excluded anyone with respiratory or cardiac symptoms.
Results: Data from 338 people in the southern region of Saudi Arabia were collected; seventy-five of them (22.2%) were female and 263 (77.8%) were male, mean age was 29.6 years. Smoking status: never smoked, 277 (82%); previous smoker, 7 (2%); current smoker, 54 (16%). Room-air SpO2 values of less than 92% were noted in 6% of asymptomatic volunteers.
Statistical analysis showed no effects due to age (p = 0.27), smoking history (p = 0.69), gender (p = 0.33), blood pressure (p = 0.3), respiratory rate (p = 0.819), body mass index (p = 0.45) on SpO2 levels as assessed by room air pulse oximetry.
Conclusion: Personal characteristics, such as age, gender, smoking history, blood pressure, respiratory rate, and BMI had no effect on room-air SpO2 values.
Keywords: pulse oximetry; BMI; saturation; oxygen.
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Corresponding Author
Dr Kamalasanan. C.G
Additional Professor, Dept of Internal Medicine, Government Medical College, Calicut, 673008, Kerala, India
DOI: https://dx.doi.org/10.18535/jmscr/v7i8.110
