Abstract
ObjectiveWe developed a new chest compression depth (CCD) measuring technology using radar and impulse-radio ultra-wideband (IR-UWB) sensor. This study was performed to determine its accuracy on a soft surface.MethodsFour trials, trial 1: chest compressions on the floor using an accelerometer device; trial 2: chest compressions on the floor using an IR-UWB sensor; trial 3: chest compressions on a foam mattress using an accelerometer device; trial 4: chest compressions on a foam mattress using an IR-UWB sensor, were performed in a random order. In all the trials, a cardiopulmonary resuscitation provider delivered 50 uninterrupted chest compressions to a manikin.ResultsThe CCD measured by the manikin and the device were as follows: 57.42 ± 2.23 and 53.92 ± 2.92 mm, respectively in trial 1 (p < 0.001); 56.29 ± 1.96 and 54.16 ± 3.90 mm, respectively in trial 2 (p < 0.001); 55.61 ± 1.57 and 103.48 ± 10.48 mm, respectively in trial 3 (p < 0.001); 57.14 ± 3.99 and 55.51 ± 3.39 mm, respectively in trial 4 (p = 0.012). The gaps between the CCD measured by the manikin and the devices (accelerometer device vs. IR-UWB sensor) on the floor were not different (3.50 ± 2.08 mm vs. 3.15 ± 2.27 mm, respectively, p = 0.136). However, the gaps were significantly different on the foam mattress (48.53 ± 5.65 mm vs. 4.10 ± 2.47 mm, p < 0.001).ConclusionThe IR-UWB sensor could measure the CCD accurately both on the floor and on the foam mattress.
Highlights
A deeper chest compression is associated with improved survival outcomes in cardiac arrest patients [1, 2]
The gaps between the chest compression depth (CCD) measured by the manikin and the devices on the floor were not different (3.50 ± 2.08 mm vs. 3.15 ± 2.27 mm, respectively, p = 0.136)
Measurement of chest compression depth by using impulse-radio ultra-wideband (IR-UWB) sensor trial 2 (Chest compressions on the floor with an IR-UWB sensor), the CCD measured by the manikin and the IR-UWB sensor were 56.29 ± 1.96 mm and 54.16 ± 3.90 mm, respectively (p < 0.001)
Summary
A deeper chest compression is associated with improved survival outcomes in cardiac arrest patients [1, 2]. Several technologies were reported to overcome this drawback [7,8,9] One such technology, the TrueCPR (Physio-Control, Redmond, Washington, USA), which uses a three-dimensional magnetic field, was produced as a commercially available device. There are some limitations in using the TrueCPR device in a clinical setting, because a large-sized back pad (74 mm × 266 mm ×100 mm) should be placed under the patient’s thorax to measure the CCD accurately on soft surfaces. The size of the chest pad is not small (35 mm × 225.6 mm × 83 mm), and it has a hard surface Another technique, which uses a flexible pressure sensor, could overcome the drawbacks of TrueCPR, it has not been produced as a commercially available device [12]
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