OptiSense1999 pacing lead offers accurate diagnosis owing to it's optim insulation, optimized ring to tip spacing, highly accurate atrial sensing, body diameter of thin lead, steroid elution with low thresholds and fractal coating of titanium nitride for low polarization. The highly optimized spacing of the electrodes results in atrial sensing that is accurate and less interfering from R-wave far field. A significant drop in P-wave amplitude is observed during atrial fibrillation(AF) and electrode spacing of 1.1mm results in high sensitivity of atrial settings without extra atrial signals that are sensing inappropriately. Owing to this, the OptiSense1999 gives accurate diagnosis and decision making through optim insulation.