| abstract |
A method and apparatus for monitoring the hemodynamic status of a patient is provided. It comprises an implantable monitor with one or a plurality of sensors configured for extravascular placement, electronic circuitry that is coupled to the sensors and processes their output, a transmitter/receiver for conveying information between the monitor and an external unit, and a patient alert which notifies the patient if medical attention should be sought. The extravascular sensors include vascular plethysmography, heart and lung sounds, thoracic impedance, and ECG. In the preferred embodiment, the radio frequency transmitter/receiver provides for the automatic telemetry of data, without requiring the active participation of the patient or clinician. Thus data can be conveyed routinely and automatically, allowing more computationally demanding analysis to be done by an external device, or allowing human review at a central location. The monitor is particularly applicable to patients with heart failure. |