The models for estimation of the arterial pressure with the usage of the finger photoplethysmogram on smartphone

Arterial pressure - one of the main indicators of functional state of cardiovascular system. The problem of arterial hypertension is one of the most topical issues in modern medicine, because it causes a constant increasement in the number of heart attack, stroke and adrenal insufficiency cases. The constant monitoring of blood pressure is a very important, however, modern cuff methods are inconvenient and impractical in the field survey.
To meet this need, a non-invasive method of non-cuffed estimation of blood pressure by photoplethysmograms has been proposed, which is recorded using a smartphone camera. Photoplethysmogram recordings were obtained from two individuals (a 69-year-old woman and a 22-year-old girl). In total, 78 real records were made. The eight indicators of the averaged photoplethysmogram were used as the potential regressors of statistical models.
The best regression models were selected for the evaluation of systolic and diastolic blood pressure. The systolic blood pressure estimation model provided a coefficient of determination of 0,8 and standard deviation mmHg and the model for estimating diastolic blood pressure provided a coefficient of determination of 0,3 and standard deviation mmHg. The models are implemented in a mobile application for a smartphone.