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A New Self-Anchoring Endocardial Electrode

We describe a new electrode which uses the self-anchoring property of an ejectable dart to remain in permanent contact with the right ventricular myocardium. In longrange animal experiments, there were neither disloca tions nor mechanical failures. Both acute and chronic threshold measure ments, as well as sensing characteristics, remained acceptable. The experi mental lead was applied in a clinical case refractory to treatment by other electrodes. The application of this dart-electrode appears to be indicated when elec trode instability occurs. Further well-controlled clinical trials appear to be necessary before it could be recommended for routine clinical use for all patients requiring transvenous pacemaker implants.