PVC

Premature ventricular contraction.

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Pyarthrosis
Infectious arthritis. Pyarthrosis is typically caused by a bacterial infection in the joint. Diagnosis is made by analysis of fluid that has been removed from the joint, including microscopic examination and culture. Pyarthrosis requires drainage of the joint and antibiotics, usually intravenously administered. Pyarthrosis is also referred to as suppurative, septic, or bacterial arthritis.
Pycnodysostosis
An inherited disorder of bone that causes short stature and abnormally dense brittle bones. Pycnodysostosis can be due to a defect in the enzyme cathepsin K. Sometimes spelled pyknodysostosis. The French artist Toulouse-Lautrec is thought to have had this disease. No specific treatment is available.