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The procedure may be shortened by utilizing body sur- face mapping to quickly identify the target area by first de- termining the exit site of the VT, from where a suitable ab- lation site can be found by a short local activation sequence mapping procedure (1). A database of paced body surface QRS integral maps (QRSI's) corresponding to known pac- ing positions is helpful for localization of the VT exit site. Because an infarction scar influences the relation between QRSI and exit site, specific databases have been developed for patients with a normal left ventricle (NLV) and with prior inferior (IMI) or anterior myocardial infarction (AMI) (2, 3). With these databases, localization can be performed by identifying one of 18 to 25 segments in the left ventricle. To increase localization accuracy, an algorithm was previ- ously developed that provides continuous localization by interpolating in the NLV database (4). We adapted this al- gorithm to render it suitable for the AMI and IMI databases as well, and tested it with all three databases. Adaptation was necessary to accommodate the somewhat more irregu- lar distribution of exit site coordinates over QRSI space that was observed in AMI and IMI patients.

Continuous Localization of Ventricular Tachycardia Exit Sites in Patients With Previous Myocardial Infarction