Gated physiological monitoring systems and methods are described that utilize a photoplethysmogram (PPG) monitoring device and another (different) physiological monitoring device, where the PPG monitoring device is operated based on timing information obtained from the other physiological monitoring device. In some implementations, control circuitry can be configured to operate the PPG monitoring device based on timing information from a physiological waveform detected by the physiological monitoring device. For example, the control circuitry can operate the PPG monitoring device to capture one or more selected portions of a measured PPG waveform that can then be used to estimate the full PPG waveform or portions of interest.
