Pacemaker (artificial) - In cardiology, an electrical device that substitutes for a malfunctioning natural pacemaker (node) to control the beating of the heart.
 
Pacemaker (temporary) - An electronic cardiac pacemaker placed externally on a patient’s body. Intended for temporary use, usually until an internal pacemaker is surgically implanted.
 
Pacer - A pacemaker.
 
Pacing - The setting of the rate or pace.
 
Palpitation - The rapid, pounding or fluttering of the heart, as perceived by the patient.
 
Pericardial Effusion - A collection of fluid or blood in the pericardial space (inside the pericardial sac) around the heart. Some causes include congestive heart failure, cancer and autoimmune disease.
 
Preeclampsia - Hypertension and/or swelling during pregnancy.
 
Prognosis - The probable outcome of a disease.
 
Prolapse - A falling or dropping down.
 
Pulmonary - Referring to the lungs.
 
Pulmonary Arteries - The arteries that carry venous blood from the right ventricle to the lungs.
 
Pulmonary Valve - The heart valve that divides the right ventricle and the pulmonary artery. The pulmonary valve opens when the right ventricle contracts allowing blood to flow into the pulmonary artery. The pulmonary valve has 3 valve cusps.
 
Pulmonary Veins - The veins that carry oxygenated blood from the lungs to the left atrium of the heart.
 
Pulse - The rate or rhythm of blood traveling through the arteries as a result of each heartbeat.
 
Pyrosis - Pain or burning sensation in the area of the breast bone, usually resulting from regurgitation of acid ­ peptic gastric content into the esophagus.