[ P ]

• P  an electrocardiographic wave corresponding to a wave of depolarization crossing the atria; by weight [Lat. pondere]; father [Lat. pater]; near [Lat. proximum]; near point [Lat. punctum proximum]; pain; parietal electrode placement in electroencephalography; parity; part; partial pressure; Pasteurella; paternal; patient; penicillin; penta- [10¹⁵]; percent; percussion; perforation; permeability; peta-; pharmacopeia; phenophthalein; phenylalanine; phosphate group; phosphorus; physiology; pig; pint; placebo; plan; plasma; Plasmodium; Pneumocystis; point; poise; poison, poisoning; polarity; polarization; pole; polymyxin; pons; population; porcelain; porcine; porphyrin; position; positive; posterior; postpartum; power; precipitin; precursor; prednisone; premolar; presbyopia; pressure; primary; primipara; probability; product; progesterone; prolactin; proline; promoter; properdin; propionate; protein; Proteus; proximal; Pseudomonas; psychiatry; pulmonary; pulse; pupil; radiant power; significance probability [value]; simple programmable [pacemaker]; sound power; weight [Lat. pondus]
• P₁  first parental generation; pulmonic first sound
• P₂  pulmonic second sound
• P₃  proximal third
• P³  primary prevention project
• P-50  oxygen half-saturation pressure
• P₉₀  90 percentile [statistics]
• p120  phosphoprotein 120 (kDa)
• p  atomic orbital with angular momentum quantum number 1; freeze preservation; the frequency of the more common allele of a pair; momentum; papilla; pathological; phosphate; pico-; pint; pond; pressure; probability; proton; pulse; pupil; short arm of chromosome; sound pressure
• p-  para
•   after [L. post]
• p24  HIV antigen
• Π  see pi
• π  see pi
• φ  see phi
• ψ  see psi
• PA  panic attack; pantothenic acid; paralysis agitans; paranoia; parathion; passive aggressive; pathology; patient's advocate; peak amplitude; performance assessment; periarteritis; peridural artery; periodic acid; periodontal abscess; pernicious anemia; perpetual asymmetry; phakic-aphakic; phenylalkylamine; phosphatidic acid; phenylalanine; phosphoarginine; photoallergy; phthalic anhydride; physical abuse; physician advisor; physician assistant; pituitary-adrenal; plasma adsorption; plasma aldosterone; plasminogen activator; platelet adhesiveness; platelet aggregation; platelet-associated; plicatic acid; polyamine; polyarteritis; polyarthritis; post-aural; posteroanterior; prealbumin; preadipocyte; preamplifier; predictive accuracy; pregnancy-associated; presents again; pressure augmentation [respiration]; primary aldosteronism; primary amenorrhea; primary anemia; prior to admission; proactivator; proanthocyanidin; procainamide; professional association; prolonged action; propionic acid; prostate antigen; protective antigen; proteolytic action; prothrombin activity; protrusio acetabuli; pseudoaneurysm; Pseudomonas aeruginosa; psychoanalysis; psychogenic aspermia; pulmonary arterial [pressure]; pulmonary artery; pulmonary atresia; pulpoaxial; puromycin aminonucleoside; pyruvic acid; pyrrolizidine alkaloid; yearly [Lat. per annum]
• P-A  posteroanterior
• P(A)  probability of event A
• P&A  percussion and auscultation
• P_A  alveolar pressure; atrial pressure; paternal allele; partial pressure of arterial fluid
• PA3  Atrial Pacing Peri-Ablation for Paroxysmal Atrial Fibrillation [trial]
• Pa  acellular pertussis [vaccine]; atrial pressure; pascal; pathologist, pathology; prealbumin; protactinium; Pseudomonas aeruginosa; pulmonary arterial [pressure]
• pA  picoampere
• pa  through the anus [Lat. per anum]; yearly [Lat. per annum]
• PAA  partial agonist activity; phenylacetic acid; phosphonoacetic acid; physical abilities analysis; plasma angiotensinase activity; polyacrylamide; polyacrylic acid; polyamino acid; pyridine acetic acid
• PAAI  personal access and alert interface [telemedicine]
• pAAM  polyacrylamide
• P(A-a)O₂  alveolar-arterial oxygen pressure difference
• PAAS  panic and anticipatory anxiety scale
• PAB  para-aminobenzoate; performance assessment battery; pharmacologic autonomic block; poly(A)-binding [protein]; premature atrial beat; purple agar base
• Pab  abdominal pressure
• pAb  polyclonal antibody
• PABA, pABA  para-aminobenzoic acid
• PABD  predeposit autologous blood donation
• PABP  poly A binding protein; pulmonary artery balloon pump
• PABV  percutaneous aortic balloon valvuloplasty
• PAC  paclitaxel; P1 artificial chromosome; papular acrodermatitis of childhood; parent-adult-child; pericarditis-arthropathy-camptodactyly [syndrome]; phenacetin, aspirin, and caffeine; physical activity [scale]; plasma aldosterone concentration; platelet-associated complement; Policy Advisory Committee; preadmission certification; premature atrial contraction; product of ambulatory care; pulmonary artery catheterization
• pac  pachytene
• PACAP  pituitary adenylate cyclase activating polypeptide
• PAC-A-TACH  Pacemaker Atrial Tachycardia [trial]
• PACC  primary ambulatory care center; promoting aphasics' communicative competence
• PACCO  Pulmonary Artery Catheterization and Clinical Outcomes [study]
• PACCS  Prospective Army Coronary Calcium Study
• PACE  Pacing and Clinical Electrophysiology; paired basic amino acid cleaving enzyme; Partnership in Active Continuous Education; Patient Care Expert [artificial intelligence nursing decision support]; people with arthritis can exercise [program]; personalized aerobics for cardiovascular enhancement; population-adjusted clinical epidemiology; Prevention with Low-dose Aspirin of Cardiovascular Diseases in the Elderly [study]; primary ambulatory care and education; Program of All-inclusive Care for the Elderly; pulmonary angiotensin I converting enzyme
• PACI  Partnership for Advanced Computational Infrastructure
• PACIFIC  potential angina class improvement from intramyocardial channels
• PACK  Prevention of Atherosclerotic Complications with Ketanserin [study]
• PACNS  primary angiitis of the central nervous system
• PA_CO  mean alveolar gas volume
• P_ACO2  partial pressure of carbon dioxide in alveolar gas
• P_aCO2  partial pressure of carbon dioxide in arterial blood
• PACP  pulmonary alveolar-capillary permeability; pulmonary artery counterpulsation
• PACS  picture archiving and communication system; postoperative atrial fibrillation in cardiac surgery
• PACS DB  picture archiving and communication system data base
• PACST  Putney Auditory Comprehension Screening Test
• PACT  papillary carcinoma of thyroid; Philadelphia Association of Clinical Trials; Plasminogen Activator Angioplasty Compatibility Trial; Plasminogen Activator Coronary Angioplasty Trial; precordial acceleration tracing; Prehospital Application of Coronary Thrombolysis [study]; prepaid accountable care term; prescription analyses and cost; Prospective Acute Coronary Syndrome Trial; Pro-urokinase in Acute Coronary Thrombosis [study]
• PACU  postanesthetic care unit
• PACV  Pacui virus
• PACWP  pulmonary arterial capillary wedge pressure
• PAD  pain and distress; patient surface axis depth; percutaneous abscess drainage; percutaneous automated discectomy; peripheral artery disease; phenacetin, aspirin, and desoxyephedrine; photon absorption densitometry; practitioners accessing data; primary affective disorder; psychoaffective disorder; public access to defibrillation; pulmonary artery diastolic; pulsatile assist device; pulsed amperometric detection
• PAD-I  Public Access Defibrillation I [trial]
• PADL  personal activities of daily living
• PADP  pulmonary artery diastolic pressure
• PADPRP, pADPRP  polyadenosine diphosphate-ribose polymerase
• PADS  patient archiving and documentation system
• PADUA  progressive augmentation by dilating the urethra anterior
• PAdV 1-3, 4, 5  porcine adenoviruses 1-3, 4, 5
• PAdV-A, B, C  porcine adenoviruses A, B, and C
• PADyC  passive arm with dynamic constrains [computer-assisted surgery]
• PAE  paradoxical air embolism; postanoxic encephalopathy; post-antibiotic effect; progressive assistive exercise
• PAEC  porcine aortic endothelial cell
• paed [paediatrics, paediatric]  pediatrics, pediatrics
• PAEDP  pulmonary artery end-diastolic pressure
• PAEP  progestagen-associated endometrial protein
• PAES  popliteal artery entrapment syn-drome
• PAF  paroxysmal atrial fibrillation; peroxisomal assembly factor; phosphodiesterase-activating factor; plain abdominal film; platelet-activating factor; platelet-aggregating factor; pollen adherence factor; population-attributable fractions; premenstrual assessment form; progressive autonomic failure; pulmonary arteriovenous fistula; pure autonomic failure
• PA&F  percussion, auscultation, and fremitus
• PAFA  priority based assessment of foot additives
• PAF-A  platelet-activating factor of anaphylaxis
• PAFAC  Prevention of Atrial Fibrillation After Cardioversion [study]
• PAFAH  platelet-activating factor acetylhydrolase
• PAFAMS  Pan-American Federation of Associations of Medical Schools
• PAFD  percutaneous abscess and fluid drainage; pulmonary artery filling defect
• PAFI  platelet-aggregation factor inhibitor
• PAFIB  paroxysmal atrial fibrillation
• PAFIT  Paroxysmal Atrial Fibrillation Italian Trial
• PAFP  pre-Achilles fat pad
• PAFra  platelet-activating factor receptor antagonist
• PAFT  Propafenone Atrial Fibrillation Trial
• PAG  periaqueductal gray [matter]; polyacrylamide gel; pregnancy-associated globulin; proliferation-associated gene; proximal anastomosis graft; pulmonary arteriography
• pAg  protein A-gold [technique]
• PAGA  proliferation-associated gene A
• PAGE  perfluorocarbon-associated gas exchange; polyacrylamide gel electrophoresis
• PAGE-IEF  polyacrylamine gel electrophoresis-isoelectric focusing [electrophoresis]
• PAGIF  polyacrylamide gel isoelectric focusing
• PAGMK  primary African green monkey kidney
• PAGOD  pulmonary hypoplasia-hypoplasia of pulmonary artery-agonadism-omphalocele/diaphragmatic defect-dextrocardia [syndrome]
• PAH  para-aminohippurate; phenylalanine hydroxylase; polycyclic aromatic hydrocarbon; predicted adult height [by Bayley-Pinneau]; pulmonary alveolar hypoventilation; pulmonary artery hypertension; pulmonary artery hypotension
• PAHA  para-aminohippuric acid; procainamide-hydroxylamine
• PAHO  Pan-American Health Organization
• PAHP  p-aminoheptanoylphenone
• PAHV  Pahayokee virus
• PAHVC  pulmonary alveolar hypoxic vasoconstrictor
• PAI  pain assessment inventory; partial androgen insensitivity; pathogenicity island; patient assessment instrument; perforating arterial infarction; plasminogen activator inhibitor; platelet accumulation index
• PAI-1  plasminogen activator inhibitor 1
• PAI-2  plasminogen activator inhibitor 2
• PAIC  procedures, alternatives, indications, and complications
• PAICS  phosphoribosylaminoimidazole carboxylase
• PAID  problem areas in diabetes [scale]
• PAIDS  paralyzed academic investigator's disease syndrome; pediatric acquired immunodeficiency syndrome
• PAIg  platelet-associated immunoglobulin
• PAIgG  platelet-associated immunoglobulin G
• PAIMS  Plasminogen Activator Italian Multicenter Study
• PAIN  pyoderma gangrenosum, aphthous stomatitis, inflammatory eye disease, erythema nodosum [disorders associated with inflammatory bowel disease]
• PAIRS  Pain and Impairment Relationship Scale
• P_airway  airway pressure
• PAIS  partial androgen insensitivity syndrome; phosphoribosylaminoimidazole synthetase; Pravastatin in Acute Ischemic Syndromes [study]; psychosocial adjustment to illness scale
• PAIS-SR  psychosocial adjustment to illness scale-self reported
• PAIVS  Pulmonary Atresia with Intact Ventricular Septum [collaborative study]
• PAJ  paralysis agitans juvenilis
• PAK  p21-activated kinase; pancreas after kidney [transplantation]
• PAKY  percutaneous access to kidney
• PAKY-RCM  percutaneous access to kidney-remote center of motion [computer-assisted surgery]
• PAL  paradox advanced [computer] language; pathology laboratory; peptidyl-alpha-hydroxyglycine alpha-amidating lysine phase alteration plane; physical activity level; pointer to text application language; posterior assisted levitation [cataract surgery]; posterior axillary line; product of activated lymphocytes; pyogenic abscess of the liver
• pal  palate
• PALA  N-(phosphonacetyl)-L-aspartate
• PALP  placental alkaline phosphatase
• palp  palpation, palpate
• palpi  palpitation
• PALS  parietolateral lymphocyte sheath; Patient Advocacy and Liaison Service; pediatric advanced life support; prison-acquired lymphoproliferative syndrome
• PALV  Palyam virus
• PAM  pancreatic acinar mass; penicillin aluminum monostearate; peptidylglycine alpha-amidating monooxygenase; phenylalaline mustard; physical agent modality; physical archive manager [database element]; p-methoxyamphetamine; postauricular myogenic; potassium-aggravated myotonia; pralidoxime; pre-arrest morbidity [index]; pregnancy-associated α-macroglobulin; primary amebic meningoencephalitis; principles of ambulatory medicine; professions allied to medicine; pulmonary alveolar macrophage; pulmonary alveolar microlithiasis; pulse amplitude modulation; pyridine aldoxime methiodide
• PAMC  pterygoarthromyodysplasia congenita
• 2-PAM Cl  2-pralidoxime chloride
• PAMD  primary adrenocortical micronodular dysplasia
• PAME  preanesthesia medical examination; primary amebic meningoencephalitis
• PAMI  Primary Angioplasty in Myocardial Infarction [trial]
• PAMIE  physical and mental impairment of function evaluation
• PAMI-No SOS  Primary Angioplasty in Myocardial Infarction with No Surgery on Site
• PAMP  pulmonary artery mean pressure
• PAMR  progressively automated medical record
• PAMV  Pampa virus
• PAN  periarteritis nodosa; periodic alternating nystagmus; peroxyacylnitrate; personal area network; polyarteritis nodosa; positional alcohol nystagmus; puromycin aminonucleoside
• pan  pancreas, pancreatic, pancreatectomy
• Panc  pancreas or pancreatic
• P-ANCA  perinuclear anti-neutrophilic cytoplasmic antibody
• PAND  primary adrenocortical nodular dysplasia
• PANDA  Paediatric Asthma Education of a New Multidose Dry Powder Inhaler [study]
• PANDAS  pediatric autoimmune neuropsychiatric disorders associated with streptococcal infection
• PANE  pediatric ambulance needs evaluation
• PANI  polyanilide
• PANS  puromycin aminonucleoside
• PANSS  Positive and Negative Syndrome Scale
• PAO  peak acid output; periacetabular osteotomy; peripheral airway obstruction; plasma amine oxidase; polyamine oxidase; pulmonary artery occlusion; pustulotic arthroosteitis
• PAO₂  alveolar oxygen partial pressure
• PAo  airway opening pressure; ascending aortic pressure; pulmonary artery occlusion pressure
• PaO₂  partial arterial oxygen tension
• PAO₂/FIO₂, PaO₂/FiO₂  ratio of alveolar partial pressure of oxygen to fraction of inspired air
• PAOD  peripheral arterial occlusive disease; peripheral arteriosclerotic occlusive disease
• Pao, max  peak airway pressure
• PAOP  p-aminooctanoylphenone; pulmonary artery occlusion pressure
• PaOP  pulmonary artery occlusion pressure
• PAP  pancreatitis-associated protein; Papanicolaou [test]; papaverine; passive-aggressive personality; password authentication protocol; patient assessment program; peak airway pressure; phosphoadenosine phosphate; peroxidase antibody to peroxidase; peroxidase-antiperoxidase [method]; placental acid/alkaline phosphatase; poly A polymerase; positive airway pressure; primary atypical pneumonia; prostatic acid phosphatase; pulmonary alveolar proteinosis; pulmonary artery pressure; purified alternate pathway
• Pap  Papanicolaou test
• pap  papilla
• PAPC  paraxial protocadherin
• PAPF  platelet adhesiveness plasma factor
• papova  papilloma-polyoma-vacuolating agent [virus]
• PAPP  para-aminopropiophenone; pregnancy-associated plasma protein
• PAPPA  pregnancy-associated plasma protein A
• PAPPC  pregnancy-associated plasma protein C
• PAPR  powered air purifying respirator
• PAPS  3´-phosphoadenosine-5´-phosphosulfate; primary antiphospholipid antibody syndrome
• Paps  papillomas
• Pap sm  Papanicolaou smear
• PAPUFA  physiologically active polyunsaturated fatty acid
• pa-pv  pulmonary arterial pressure-pulmonary venous pressure
• PAPVC  partial anomalous pulmonary venous connection
• PAPVD  partial anomalous pulmonary venous drainage
• PAPVR  partial anomalous pulmonary venous return
• PAQ  patient asked questions; Personal Attitudes Questionnaire
• PAQLQ  Pediatric Asthma Quality of Life Questionnaire (PAQLQ)
• PAR  parent in semantic hierarchy [UMLS]; participating provider; passive avoidance reaction; percentage abnormal results; perennial allergic rhinitis; photosynthetically active radiation; Physical Activity Recall [Questionnaire]; physiological aging rate; plain abdominal radiograph; platelet aggregation receptor; platelet aggregate ratio; Policy, Action, and Rational Drug Use [WHO]; population-attributable risk; postanesthesia recovery; postanesthesia [recovery] room; posterior wall or aortic root; primary angioplasty research; Program for Alcohol Recovery; proximal alveolar region; pseudoautosomal region; pulmonary arteriolar resistance
• PAR%  population-attributable risk percent
• par  paraffin; paralysis
• PARA, Para, para  number of pregnancies producing viable offspring
• para  paraplegic; parathyroid, parathyroidectomy
• para 0  nullipara
• para I  primipara
• para II  secundipara
• para III  tripara
• para IV  quadripara
• PARADIGM  Platelet Aggregation Receptor Antagonist Dose Investigation for Perfusion Gain in Myocardial Infarction [study]
• PARADISE  Platelet IIb/IIIa Antagonism for the Reduction of Acute Coronary Events Dose Investigation and Safety Evaluation [study]
• PARAGON  Platelet IIb/IIIa Antagonist for the Reduction of Acute Coronary Syndrome Events in a Global Organization Network [study]
• parasit  parasitology; parasite, parasitic
• parasym  parasympathetic
• PARAT  Prevention of Arterial Restenosis Angiographic Trial

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