A device for monitoring a heart includes a lead wire having a first end and a second end, the second end in contact with tissue of the heart a first sensor disposed along the length of the lead wire and a second sensor disposed at the second end of the lead wire. The first sensor is configured to measure an oxygen content of blood in the heart and the second sensor is configured to measure a fluid pressure in the heart. The device further includes a control module connected to the first end of the lead wire and configured to receive signals related to the measured fluid pressure and the measured oxygen content from the first and second sensors.
