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 ()
RateP126
Normal
60, 100, 120, 150
60 x 4
Pos.1
480 lux
,
D1R110P126
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.