Catheter stability indication

A method, comprising the steps of:

• introducing a probe into a fluid-filled body cavity of a subject, the probe having a temperature sensor on a distal portion of the probe thereon, the body cavity having an interior wall;
• passing an irrigating fluid through the probe, wherein the irrigating fluid exits the probe at the distal portion and wherein a temperature of the irrigating fluid is different from a temperature of the body cavity;
• while passing the irrigating fluid, recording a first temperature reading and thereafter recording a second temperature reading of the temperature sensor, wherein the second temperature reading further comprises transient elevations of between 1 to 4° C. that are between 0.3 to 5 seconds in duration;
• making a determination from the temperature readings that predetermined contact criteria between the probe and the interior wall of the body cavity are satisfied, wherein the contact criteria comprises the second temperature reading being lower than the first temperature reading;
• reporting a contact between the probe with the interior wall responsively to the determination;
• and
• alerting an operator that the contact criteria are satisfied.