Effect of Pore Size on Threshold and Impedance of Pacemaker Electrodes
The effect of pore size on threshold and pacing impedance of two sintered porous platinum electrodes was evaluated using non porous electrodes as controls.
Seventeen 8 mm2 non-porous (NP), 17, 8 mm2 large porous (LP) (200 micron diameter spheres) and 16, 8 mm2 small porous (SP) (80 micron diameter spheres) were implanted, together with an Impedance and Threshold Measuring Pulse Generator in 32 male and 18 female patients with a mean age of 72 years. There was an attrition rate of 12% due to pacemaker unrelated death. No patients were treated with cardioactive drugs during the study.
The results indicate that there is no significant difference among the 3 electrode types over a 6 month period for threshold and pacing impedance. This study has shown that the porosity of pacemaker electrodes does not influence the acute or chronic values of threshold or pacing impedance.
KeywordsPorosity Platinum Impe
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