paroxysmal nocturnal dyspnea patient awakens at night from sleep with severe shortness of breath and must dangle the legs or walk to an open window; relief occurs only after several minutes.
pathogenesis the development of morbid conditions or of disease, particularly the cellular events and reactions and other pathologic mechanisms occurring in the development of disease.
PCI percutaneous coronary intervention; percutaneous trans-luminal coronary angioplasty (PTCA), often involving the use of intracoronary stents.
pericardial effusion excess fluid within the pericardial sac.
pericarditis inflammation of the pericardium or sac surround¬ing the heart; this is not a heart attack.
pericardium the thin, tough membrane or sac that surrounds the heart.
phlebitis inflammation of the wall of a vein.
plaque of atheroma same as atherosclerotic, a plaque that juts into the lumen and obstructs the flow of blood in arteries.
platelet aggregation clumping together of small particles in the blood; platelets increase clot formation.
platelets very small disk-like particles that circulate in the blood alongside red and white blood cells initiating the formation of blood clots; platelets clump and form little plugs called platelet aggregation, thus causing minor bleeding to stop.

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