Evaluation of Seismocardiography(SCG) for Assessing Fitness and Predicting Outcomes in Oesophageal Cancer Surgery

"Seismofit® is a 3 x 5 x 1.5 cm Class I medical device manufactured by Ventriject, which utilizes SCG principles and machine learning to estimate an individual's fitness. It is afixed to a patient's sternum with an adhesive patch. It measures the amplitude and timing of vibrations on the chest using accelerometers. The device then averages the data collected over 45 seconds to create the SCG. From the SCG, several maxima and minima (fiducial points) are identified, which correlate to the opening and closing of the mitral and aortic valves. Features of the SCG, including the timing, frequency, amplitude, and variability of these points, are then incorporated into an algorithm that also considers patient height, weight, age, and sex to calculate the VO2 peak.~Data is transmitted via Bluetooth to an allocated smartphone app."