| PRBC | packed red blood cells; placental residual blood volume |
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| PRBV | placental residual blood volume |
| pTNM | TNM staging of tumors as determined by correlation of clinical, pathologic, and residual findings |
| PVR | peripheral vascular resistance; perspective volume rendering; poliovirus receptor; postvoiding resid... |
| RA | radioactive; ragocyte; ragweed antigen; rapidly adapting [receptors]; reactive arthritis; reciprocal... |
| labyrinthine vertigo | <neurology> A name applied to recurrent vertigo accompanied by ringing in the ears (tinnitus) and deafness. A dysfunction of the semi-circular canals (endolymphatic sac) in the inner ear. Symptoms include dizziness, hearing loss (one-sided), vertigo, nausea, vomiting and abnormal eye movements. Treatment includes anticholinergics, antihistamines and other medications which relieve vertigo. Diuretic medications have been used to lower pressure in the endolymphatic sac. (27 Sep 1997) |
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| laryngeal vertigo | Fainting as a result of a coughing spell, caused by persistent increased intrathoracic pressure diminishing venous return to the heart, thus lowering cardiac output; most often occurs in heavy-set male smokers who have chronic bronchitis. Synonym: Charcot's vertigo, laryngeal vertigo. (05 Mar 2000) |
| lateral vertigo | Dizziness caused by watching the telegraph poles and fences from the window of a fast-moving vehicle. (05 Mar 2000) |