Feasibility of Measuring Volume of Inspiration Via Noninvasive Motion Sensors

Overview

Background: Lung problems develop in up to 20% of people after they have surgery. While under general anesthesia, people breathe slower and draw in less air. They may have difficulty returning to normal deep breathing as they recover. Some may develop life-threatening complications. An approved device called an incentive spirometer is used to help measure and improve a person's breathing after surgery. Researchers want to find out if a motion sensor placed on the chest can also measure the volume of air a person inhales as they breathe. Objective: To determine if a motion sensor on the chest can measure the volume of air a person breathes. Eligibility: Healthy adults aged 18 years and older. Design: * Participants will have one clinic visit. The visit will last 10 to 30 minutes. * They will fill out a form with their age, sex, height, and weight. * A small, plastic motion sensor will be taped to their chest on one or both sides. * Participants will breathe through a tube attached to an incentive spirometer. They will take 18 breaths of different volumes, both deep and shallow. * Researchers will use the data collected from the motion sensors to measure how the chest moves at different levels of breathing. The motion sensor data will be used to create a software program that converts chest wall motion to the volume of air inhaled for a given breath in real time.

Study Description: This protocol is a basic physiologic proof-of-concept study enrolling normal volunteers to determine the feasibility of measuring volume of inspiration from chest wall motion measured via non-invasive thoracic motion sensors. The motion sensors are not medical devices because they are not intended to diagnose a disease or condition or to cure, mitigate, treat or prevent disease. Since motion sensors are not being evaluated for diagnostic purposes or being studied themselves within the context of this protocol and are only intended to collect physiological data, they are not to be considered investigational. The data collected in this feasibility study will not contain any personally identifiable information (PII). In this study, healthy participants will complete a total of approximately 18 measured breaths through a traditional incentive spirometer while wearing small, non-invasive motion sensors on their thorax at approximately the level of the 9th and 10th ribs unilaterally or bilaterally. The incentive spirometer is an FDA approved medical device. This study does not aim to study the safety or effectiveness of this device but rather utilize the device as a tool to measure volume of inspiration. The waveform data collected from the devices with each breath will then be analyzed with the intention to develop an algorithm that could convert chest wall motion to a discrete volume of inspiration in real time. Total enrollment time will be about 10-30 minutes per participant. Objectives: Primary: To collect chest wall motion data corresponding to various volumes of inspiration from a non-invasive wearable device. Secondary: To develop an algorithm which can convert chest wall motion to volume of inspiration and assess the algorithm using cross-validation strategy. Endpoints: Primary: A database of motion waveforms corresponding to each measured volume of inspiration via traditional incentive spirometer. Secondary: A cross-validated algorithm that converts chest wall motion to volume of inspiration.