| PAVNRT | paroxysmal atrioventricular nodal reciprocal tachycardia |
|---|---|
| PNB | p-nitrobiphenyl; perineal needle biopsy; peripheral nerve block; premature nodal beat |
| PNC | penicillin; peripheral nucleated cell; pneumotaxic center; premature nodal contracture |
| SANDR | sinoatrial nodal reentry |
| TNI | total nodal irradiation |