Toe photoplethysmographic monitor, a promising noninvasive technique for tracking systolic blood pressure trends beat-to-beat

摘要

The call for early detection of hypotension creates a heavy demand for new methods that can monitor trends in blood pressure (BP) levels continuously and noninvasively. Photoplethysmography (PPG) is widely used in hemodynamic analysis. We assessed the feasibility of toe PPG in tracing BP trends using BP readings obtained by standard intermittent noninvasive BP measurements from the arm of a patient with severe hypoxic-ischemic brain injury. We demonstrated that an attenuated or inversed dicrotic wave of toe PPG is predictive of BP trends, and this method could be applicable for the continuous noninvasive monitoring of systolic BP at a beat-by-beat basis.