A Feasibility Study for Measuring Accurate Chest Compression Depth and Rate on Soft Surfaces Using Two Accelerometers and Spectral Analysis

Table 1

Computed chest and mattress displacement ( and ), reference chest compression depth (), and unsigned error in the estimation of the spinal-sternal displacement with one accelerometer (error1acc) and two accelerometers (error2acc), for different mattress/backboard combinations.

Mattress	Parameter (mm)
				error1acc	error2acc
Foam
Backboard	55.6 (51.7, 58.8)	7.0 (6.4, 7.4)	48.5 (45.4, 51.6)	4.5 (2.8, 6.8)	3.1 (1.5, 4.5)
No backboard	56.6 (52.1, 60.2)	10.4 (9.5, 11.4)	46.0 (42.0, 48.9)	9.1 (7.4, 11.2)	2.0 (0.9, 3.1)
Sprung
Backboard	69.9 (62.3, 79.6)	24.0 (21.6, 27.9)	45.8 (40.5, 51.8)	25.2 (22.4, 29.0)	1.9 (0.9, 3.3)
No backboard	83.4 (78.4, 89.1)	37.2 (35.0, 40.0)	46.0 (42.6, 49.7)	37.7 (34.9, 41.4)	1.6 (0.6, 3.1)
Global	61.9 (55.5, 78.7)	17.0 (8.0, 32.5)	46.7 (42.7, 50.4)	18.1 (7.2, 32.8)	2.1 (0.9, 3.6)