2. an agent that retards any function, especially a drug that acts on the central nervous system to depress activity at all levels by stabilizing neuronal membranes. Central nervous system depressants such as barbiturates and inhalational anesthetics are used as sedatives, hypnotics, and anesthetics. alcohol is also a depressant, although its first effect is sometimes stimulating.

cardiac depressant an agent that depresses the rate or force of contractions of the heart.

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acetylcholine adenosine adenosine diphosphate adenosine monophosphate adenosine triphosphatase adenosine triphosphate ADP ATP cAMP cyclic adenosine monophosphate cyclic AMP depressant disopyramide ibutilide Norpace procainamide Procanbid Pronestyl quinine			cardiac action potential cardiac aneurysm cardiac angiography cardiac apex cardiac apnea cardiac arrest cardiac arrhythmia Cardiac Arrhythmia Suppression Trial cardiac asthma cardiac atrophy cardiac blood pool imaging Cardiac Blood Pool Scan cardiac care cardiac care: acute cardiac care: rehabilitative cardiac catheter cardiac catheterization cardiac cirrhosis cardiac compression cardiac concussion cardiac conduction defect Cardiac Cripple cardiac cycle cardiac decompensation cardiac decompression cardiac depressant cardiac disease self-management cardiac dyspepsia cardiac dyspnea cardiac dysrhythmia cardiac edema cardiac electric axis cardiac enzymes cardiac event cardiac exercise stress test cardiac failure cardiac ganglion cardiac gland cardiac glycoside cardiac glycosides Cardiac Histiocyte cardiac hypertrophy cardiac impulse cardiac index cardiac infarction cardiac injury panel cardiac insufficiency cardiac jelly cardiac marker cardiac massage cardiac monitor			cardiac compression cardiac compression cardiac concussion cardiac conducting cells cardiac conducting cells cardiac conducting cells cardiac conducting system cardiac conducting system cardiac conducting system cardiac conduction defect cardiac contractility cardiac contractility Cardiac contusion cardiac cripple cardiac cycle cardiac cycle cardiac cycle cardiac cycle cardiac cycle Cardiac Cycle Length Variations Cardiac Cystic Fibrosis Transmembrane Conductance Regulator cardiac decompensation cardiac decompensation cardiac decompensation cardiac decompression cardiac decompression cardiac decompression Cardiac defibrillator Cardiac defibrillator Cardiac defibrillator cardiac depressant cardiac depressor nerve cardiac depressor nerve cardiac depressor nerve Cardiac Diagnostic and Interventional Unit Cardiac Diagnostic Unit Cardiac Diet Self-Efficacy Instrument cardiac dilatation cardiac dilatation cardiac dilatation Cardiac disease Cardiac disease Cardiac disease Cardiac disease cardiac disease self-management cardiac dullness cardiac dullness cardiac dullness cardiac dullness cardiac dyspepsia cardiac dyspnea cardiac dysrhythmia cardiac dysrhythmia cardiac dysrhythmia Cardiac dysrhythmias Cardiac dysrhythmias Cardiac dysrhythmias cardiac edema cardiac edema cardiac edema cardiac electric axis

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