Abstract: This application discloses an esophageal stethoscope for audibly and electronically monitoring a patient's cardiovascular functions. The stethoscope comprises a flexible tube which is dimensioned to be disposed in the patient's esophagus. Adjacent one end of the tube are a plurality of apertures covered by a thin membrane which allow acoustic waves to enter the tube. The other end of the tube is connected with ear pieces to allow the operator to hear the sounds received at the other end of the tube. Also disposed in the one end of the tube is an accelerometer or other electrokinetic transducer. The accelerometer is connected with a circuit for applying an excitation voltage to the accelerometer so that an analog signal is produced which varies with the acceleration of the accelerometer. A visual display is produced from the analog signal. A computer may operate on the analog signal with various algorithms to produce displays of different cardiovascular functions.