Real-Time Chest Compression Quality Measurements by Smartphone Camera

Table 1

Detailed description of the subtests included in the 5 tests performed to both measure the accuracy of QCPR cam-app 2.0’s ability to detect the compression rate under various conditions and to evaluate the CPR summary parameters calculated after an ended session.

	Subtest name	Compression rate (cpm)	Duration (s)	Camera position	Lighting	Measures
Smartphone position test ()
RateP1^26	Normal	60, 100, 120, 150	60 x 4	Pos.1	480 lux	,
D1R110P1^26	Disturb. person	110	120	Pos.1	480 lux	,
30:2P1	30:2	110	90	Pos.1	480 lux	,
LightP1	Dimmed light	110	60	Pos.1	7 lux	,
R100P2	Small part of image frame (position Change)	100	60	Pos.2	480 lux	,
R150P2	Small part of image frame (position Change)	150	60	Pos.2	480 lux	,
30:2P3	30:2 (position Change)	110	90	Pos.3	480 lux	,
R100P3	Normal (position Change)	100	60	Pos.3	480 lux	,
Outdoor test ()
OCBR110P1	Cloudy with noisy (threes) background	110	60	Pos.1	Cloudy weather	,
OCR110P1	Cloudy with no background	110	60	Pos.1	Cloudy weather	,
OSBR110P1	Sunny with noisy (threes) background	110	60	Pos.1	Sunny weather	,
OSR110P1	Sunny with no background	110	60	Pos.1	Sunny weather	,
Disturbance test ()
D2R110P1	Disturbing person	110	180	Pos.1	Normal indoor	,
Random movement test ()
Ran.MovP1	Random movements	—	150	Pos.1	Normal indoor
CPR summary report test ()
CPRsrR110P1	Compressions with pauses	110	580	Pos.1	Normal indoor

R = rate; P = position; D = disturbance; O = outdoor; B = noisy background; C = cloudy; S = sunny; CPRsr = CPR summary report.