Cardiac catheters, including a lasso catheter, areprovided for use in a system for electrical mapping of theheart has an array of raised, perforated electrodes, whichare in fluid communication with an irrigating lumen. Thereare position sensors on a distal loop section and on aproximal base section of the catheter. The electrodes aresensing electrodes that may be adapted for pacing orablation. The raised electrodes securely contact cardiactissue, forming electrical connections having littleresistance.
