A₂: aortic component of the second heart sound
ABE: acute bacterial endocarditis
ABI: ankle-brachial index
ACS: acute coronary syndrome
ACE: angiotensin-converting enzyme
AF: atrial fibrillation
AI: aortic insufficiency
AMI: acute myocardial infarction
Ao: aorta
AP: action potential
AS: aortic stenosis
ASD: atrial septal defect
ASH: asymmetric septal hypertrophy
AV: aortic valve
AV node: atrioventricular node
AVNRT: atrioventricular nodal reentrant tachycardia
AVRT: atrioventricular reentrant tachycardia

BID: twice daily
BP: blood pressure
BPM: beats per minute
CAD: coronary artery disease
CABG: coronary artery bypass graft
CEA: carotid endarterectomy
CBB: complete heart block
CHD: congenital heart disease
CHF: congestive heart failure
CI: cardiac index
CK: creatinine kinase
CMP: cardiomyopathy
CNS: central nervous system
CO: cardiac output
CPR: Cardiopulmonary resuscitation
CSM: carotid sinus massage
CT: computed tomography
CVD: cerebrovascular disease
CVA: cerebrovascular accident
DCM: dilated cardiomyopathy
DM: diabetes mellitus
DVT: Deep venous thrombosis
ECG: electrocardiogram
EEG: electroencephalogram
EF: ejection fraction
EPS: electrophysiological study
ETT: exercise tolerance test
HB: heart block
HCM: hypertrophic cardiomyopathy
HDL: high-density lipoprotein
HF: heart failure
HIV: human immunodeficiency virus
HOCM: hypertrophic obstructive cardiomyopathy
HR: heart rate
HTN: hypertension
IABP: intra-aortic balloon pump
ICD: implantable cardioverter-defibrillator
IDL: intermediate density lipoprotein
IE: infectious endocarditis
IHSS: idiopathic hypertrophic subaortic stenosis
INR: international normalized ratio
IVC: inferior vena cava
JVP: jugular venous pressure
LA: left atrium
LEEB: left bundle branch block
LDL: low-density lipoprotein
LMWH: low molecular weight heparin
Lp(a): lipoprotein (a)
LV: left ventricle
LVEDP: left ventricular end diastolic pressure
LVOT: left ventricular outflow tract
MAT: multi focal atrial tachycardia
MI: myocardial infarction
MR: mitral regurgitation
MRA: magnetic resonance angiography
MRI: magnetic resonance imaging
MS: mitral stenosis
MV: mitral valve
MVP: mitral valve prolapse
NSTE: non-ST elevation (MI)
NSVT: nonsustained ventricular tachycardia
NVE: native valve endocarditis
P₂: pulmonic component of the second heart sound
PA: pulmonary artery
PAC: premature atrial complex
PAD: Peripheral arterial disease
PCN: penicillin
PCW(P): pulmonary capillary wedge (pressure)
PDA: patent ductus arteriosus
PE: Pulmonary embolism
PMI: point of maximal impulse
PPH: Primary pulmonary hypertension
PS: pulmonic stenosis
PTA: percutaneous transluminal angioplasty
PTCA: percutaneous transluminal coronary angioplasty
PV: pulmonary valve
PVC: premature ventricular complex
PVE: prosthetic valve endocarditis
PVR: pulmonary vascular resistance
RBBB: right bundle branch block
RA: right atrium
RCM: restrictive cardiomyopathy
RF: rheumatic fever, or radio frequency (ablation)
RHD: rheumatic heart disease
RIND: reversible ischemic neurological deficit
RV: right ventricle
RYH: right ventricular hypertrophy
RVI: right ventricular infarction
S₁: first heart sound
S₂: second heart sound
S₃: third heart sound
S₄: forth heart sound
SA: sinoatrial
SBE: subacute bacterial endocarditis
SBP: systolic blood pressure
SCD: sudden cardiac death
SIDS: sudden infant death syndrome
SLE: systemic lupus erythematosus
SND: sinus node dysfunction
SPH: secondary pulmonary hypertension
SSS: sick sinus syndrome
STE: ST elevation (MI)
SV: stroke volume
SVR: systemic vascular resistance
SVT: supraventricular tachycardia
TAO: thromboangiitis obliterans
TdP: torsade de pointes
TEE: transesophageal echo cardiography
TG: triglyceride
TIA: transient ischemic attack
TID: three times daily
TOF: tetralogy of Fallot
TPA: tissue plasminogen activator
TR: Tricuspid regurgitation
TV: tricuspid valve
VA: unstable angina
VF: ventricular fibrillation
VLDL: very low density lipoprotein
VPC: ventricular premature complex
VSD: Ventricular septal defect
VT: ventricular tachycardia
VTE: venous thromboembolic
WPW: Wolff- Parkinson- White