Table 1.

Patient characteristics and outcomes.

	Patient 1	Patient 2	Patient 3	Patient 4	Patient 5
Age	70	74	68	73	76
Sex	M	M	M	F	M
Duration of hospitalization before helmet treatment	2 days	1 day	3 days	7 days	3 days
Time elapsed between symptom onset and helmet therapy	9 days	6 days	8 days	14 days	13 days
P/F Ratio (Prior to initiation of oxygen helmet)	<200	<200	<300	<300	<100
CRP	235.3	168.5	79	229.7	82.8
IL-6	>400	314	30.9	16.2	16.1
d-dimer	>42000	678	751	1516	1058
SOFA score (Day of admission)	5	3	3	2	3
Helmet settings
Flow rate (L/min)	60	30	50	80	50
FiO2	1.0	0.8	0.8	0.8	1.0
PEEP (cmH2O)	8	7	5	5	7
Average respiratory rate	24	32	30	22	24
Duration of helmet therapy	1 day	1 day	7 days	5 days	4 days
Duration of NO	16 days	6 days	1 day	No	12 days
Intubation (yes/no)	Yes	No	No	No	Yes
Duration of hospital stay	22 days	9 days	13 days	17 days	14 days
Outcome	Deceased	Alive	Alive	Alive	Deceased