Medical Conditions Terminology in Category P

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Percutaneous Catheter Ablation

Removal of tissue with electrical current delivered via electrodes positioned at the distal end of a catheter. Energy sources are commonly direct current (DC-shock) or alternating current at radiofrequencies (usually 750 kHz). The technique is used most often to ablate the AV junction and/or accessory pathways in order to interrupt AV conduction and produce AV block in the treatment of various tachyarrhythmias.

Periapical Abscess

Acute or chronic inflammation of tissues surrounding the apical portion of a tooth, associated with the collection of pus, resulting from infection following pulp infection through a carious lesion or as a result of an injury causing pulp necrosis. (Dorland, 27th ed)

Periodic Acid

A strong oxidizing agent.

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Periodic Alternating Nystagmus

Involuntary movements of the eye that are divided into two types, jerk and pendular. Jerk nystagmus has a slow phase in one direction followed by a corrective fast phase in the opposite direction, and is usually caused by central or peripheral vestibular dysfunction. Pendular nystagmus features oscillations that are of equal velocity in both directions and this condition is often associated with visual loss early in life. (Adams et al., Principles of Neurology, 6th ed, p272)

Periodontal Abscess

Localized circumscribed purulent area of inflammation in the periodontal tissue. It is a derivative of marginal periodontitis and commonly associated with suprabony and infrabony pockets and interradicular involvements, in contrast to periapical abscess which is attributable to pulp necrosis.

Peritonsillar Abscess

An abscess in the peritonsillar tissue extending into the tonsil capsule, resulting from suppuration of the tonsil. (Dorland, 27th ed)

Peroxyacetic Acid

A liquid that functions as a strong oxidizing agent. It has an acrid odor and is used as a disinfectant.

Peroxyethanoic Acid

A liquid that functions as a strong oxidizing agent. It has an acrid odor and is used as a disinfectant.

Peroxynitrous Acid

A potent oxidant synthesized by the cell during its normal metabolism. Peroxynitrite is formed from the reaction of two free radicals, NITRIC OXIDE and the superoxide anion (SUPEROXIDES).

Pertussis Agglutinins

Any of various biologically active proteins or toxins elaborated by Bordetella pertussis that cause the symptoms of whooping cough. Some activate pancreatic islets, others inhibit the adenylate cyclase cascade and some cause lymphocytosis.