Implementing a Wearable Sensor for Lymphedema Garments: A Prospective Study of Training Effectiveness

Lymphedema garments apply therapeutic pressure to maintain minimum leg volume. Practitioners and patients apply these garments and seek to achieve appropriate compression pressure "by feel."

A study was conducted to assess the feasibility of applying a sensor-feedback device to train staff to accurately apply garments.

A convenience sample of wound care and rehabilitation staff volunteered for a prospective, randomized, unblinded, single-center pilot study. Participants were randomized to instruction+feedback (ie, receiving training on compression application and using the device to determine whether they achieved desired pressure) or instruction only groups (n = 6 each). Each volunteer applied hook-and-loop closures on the author's leg pre- and post-training with a target of 35 mm Hg, or |Ppre- 35|= |Ppost- 35|=0. (|P| is absolute value of P). The feedback group used a device to measure the applied compression; the device consists of a capacitive sensor of thin polyurethane foam between conductive fabric layers and a microcomputer/Bluetooth transmitter under a vacuum seal that fits into a fabric pocket of a lymphedema garment at the posterior ankle and pairs with a mobile device. A lymphology-certified therapist coordinated training. Data were collected with a pen/paper tool and analyzed with Student's t test.

The instruction+feedback group was closer to target after training (|Ppre - 35|= 10 ± 12 mm Hg; |Ppost - 35|=5 ± 4 mm Hg; P <.05; paired t test) than the instruction only group (|Ppre- 35|=19 ± 11 mm Hg; |Ppost - 35|=12 ±12 mm Hg; not significant).

This wearable mobile pressure sensor device assists practitioners in applying hook-and-loop lymphedema garments closer to target pressure. Larger studies with clinicians and research that involves patient application of compression are warranted.