The Effect of N95 Mask on Peripheral Oxygen Saturation and Heart Rate among Indian Medical Professionals: A Quasi-experimental Study

Abstract

Introduction: Among all face masks, N95 masks have been recommended for medical professionals involved mainly in patients with severe respiratory illnesses. Studies showing a decrease in peripheral oxygen saturation (SpO2 ) and an increase in heart rate after N95 mask usage have already created panic/ concern among medical professionals. On the contrary, a few studies have shown no such negative impact of N95 mask usage, thereby urging scientific communities to investigate/ explore these contrasting results. Aim: To study the effect of wearing an N95 mask continuously for three hours on SpO2 and heart rate specifically in Indian medical professionals. Materials and Methods: This was a quasi-experimental study conducted for a period of 2 months from June 15, 2022, to August 15, 2022, at Shri Ram Murti Smarak Institute of Medical Sciences, Bareilly, Uttar Pradesh, India, with a total of 105 healthy Indian medical professionals aged 18-40 years (55 males, 50 females) (12 study participants dropped from the study midway). In each participant, SpO2 and heart rate were recorded first without a mask (M0) and then with a mask (M3) after three hours of routine work in the hospital. Using Mystat statistical software (version 12.0), results were expressed as mean±Standard Deviation (SD), and Student’s paired t-test was used to compare the pairs of means. Results: Among the 105 eligible participants, 93 successfully completed the study, whereas 12 participants were excluded (dropout rate=11.42%). The study included 55 males (52.38%) and 50 females (47.61%) with an age range of 18-40 years and a mean age of 30.2±6.4 years. The SpO2 levels statistically showed a highly significant decrease after three hours of wearing an N95 mask (96.5±0.83% in M0 vs. 93.98±0.6% in M3). Similarly, the heart rate statistically showed a highly significant increase after three hours of using an N95 mask (73.45±3.6 in M0 vs. 89.6±6.1 beats/min in M3). Conclusion: The authors highlighted lower SpO2 levels and an increase in heart rate after three hours of N95 mask usage specifically in Indian medical professionals and thereby appeal to develop/upgrade the N95 mask by lowering its humidity, thermal stress, and breathing resistance.

Keywords

• cardiorespiratory
• microclimate
• oximeter
• respiratory stress
• thermal stress