There are multiple definitions:

1. premature atrial complex/contraction(English)

   • also referred to a premature atrial beat, premature supraventricular complex, or premature supraventricular beat) appears to be most important as a trigger in patients with paroxysmal AF who have normal or near-normal hearts. PAC is important as a trigger of PAF
   • ECG, PVC, APB, PB, SVPB, VPB, PAF, MAD, MFS, NSVT, SCD, VT
   • Cardiology, Electrophysiology, Pathology
   • https://doi.org…-0326-9.00011-7
   • https://litfl.c…al-complex-pac/
   • https://doi.org…ardio.2021.2312

2. Products of Ambulatory Care(English)

   • Patient care

3. Political Action Committee(English)

   • Organization (management)

4. Phage-derived Artificial Chromosome(English)

   • Genetics

5. Prevention of Asthma in Childhood(English)

   • Asthma, Pediatrics, Preventive medicine

6. probably approximately correct(English)

   • Practical shorthand

7. Public Affairs Committee(English)

   • Public Health, Organizations (documentation)

8. pulmonary artery constriction(English)

   • Pulmonology, Hemodynamics, Vascular disease

9. pulmonary artery catheter(English)

   • also known as the Swan-Ganz catheter
   • RAP
   • Pulmonology, Hemodynamics, Diagnostics
   • https://doi.org…b013e32833098c6

10. pulmonary arterial compliance(English)

    • defined as SV / (systolic PAP – diastolic PAP)
    • CPS, PAH, PAP, PAWP, PH, PVR, RA, RV, SV, CTEPH
    • Hemodynamics, Pulmonology, Vessel properties
    • https://doi.org…3003.01900-2018
    • https://doi.org…jnl-2024-324243

11. pituitary adenylate cyclase(English)

    • LGN, PACAP
    • Pituitary (gland), Biochemistry

12. prostatic adenocarcinoma(English)

    • the most common form of cancer in men. It can be divided into sporadic and hereditary forms. Prostatic intraepithelial neoplasia (PIN) characterized by intra-acinar proliferation of cells with nuclear aplasia has been identified as a precursor for PAC. De novo DNA hypermethylation appears to be an early sign of prostatic carcinogenesis as well as epigenetic gene silencing of numerous other genes. In this context, several molecular alterations have been associated with PAC initiation and progression, such as in the tumor suppressor genes PTEN, CDKN1B, and TP53 as well as the oncogenes MYC (encoding c-myc) and BCL2. Furthermore, the cell cycle checkpoint gene CHEK2 was found to be an inherited prostate cancer susceptibility gene
    • PIN
    • Prostate, Oncology, Epigenetics
    • https://doi.org…09633-8.06013-1

13. pseudoaccommodative cornea(English)

    • LASIK, UCVA
    • Ophthalmology, Laser technique
    • https://doi.org…97X-20090115-13

14. primary auditory cortex(English)

    • the first relay station for auditory information in the cortex. Also known as auditory core
    • Anatomy, Brain (dys)function, Auditory system
    • https://doi.org…85157-4.01180-5

15. plasma aldosterone concentration(English)

    • DBH, PRA, TRF Na, UAE
    • Kidney and adrenals, Clinical chemistry
    • https://doi.org…ne1927.57.5_826

16. proanthocyanidin(English)

    • a substance in cranberries that inhibits the adherence of p-fimbriated Escherichia coli to the urothelial cells lining the bladder
    • UTI
    • Urology, Preventive medicine, Infection
    • https://doi.org…8.CD001321.pub7

17. post abortion care(English)

    • unsafe abortion is an important cause of maternal mortality and morbidity
    • Pregnancy, Adverse effect, Health care, Risk factor, Ethics
    • http://pubmed.n…h.gov/22669827/