| PN | papillary necrosis; parenteral nutrition; penicillin; perceived noise; percussion note; periarteriti... |
|---|---|
| PNdb | perceived noise decibel |
| S/N | signal/noise [ratio] |
| SNR | selective nerve root [block]; signal-to-noise ratio; substantia nigra zona reticulata; supernumerary... |
| A2 | Aortic Component of the Second Heart Sound(S2) |
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