Table 1.

Selected odds ratios of SARS-CoV transmission to healthcare professionals exposed and not exposed to AGMP

Procedure	Odds ratio (95% confidence interval)	Risk	PPE
Tracheal intubation	6.6 (2.3 to 18.9)	high	high-risk AGMP
Bag-mask manual ventilation before tracheal intubation	2.8 (1.3 to 6.4)	high	high-risk AGMP
Tracheotomy (and by extension, cricothyrotomy)	4.2 (1.5 to 11.5)	high	high-risk AGMP
Placement of supraglottic airway device (SGA)	Unknown	assumed high based on bag-mask manual ventilation, no studies	high-risk AGMP
Tracheal extubation or SGA removal	Unknown	assumed high, perhaps higher than tracheal intubation due to lack of paralysis and potential coughing during emergence	high-risk AGMP
Chest compressions	1.4 (0.2 to 11.2)	unknown, may depend on tracheal intubation status of patient*	unclear
Defibrillation	2.5 (0.1 to 43.9)	unknown, may depend on tracheal intubation status of patient*	unclear
Manipulation of BiPAP mask	6.2 (2.2 to 18.1)	high (based on single cohort study)	high-risk AGMP
Manipulation of oxygen mask	4.6 (0.6 to 32.5)	unclear (2 cohort studies)	unclear

All odds ratios are from Tran et. al. AGMP and risk of transmission of acute respiratory infections in healthcare workers: a systematic review. PLoS ONE 2012; DOI: 10.1371/journal.pone.0035797.29

AGMP = aerosol-generating medical procedure; BiPAP = bi-level positive airway pressure; PPE = personal protective equipment SARS = severe acute respiratory syndrome

*Based on current knowledge of tracheal intubation effect on AGMP