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Anemia - Reduction of the quantity of red blood cells or hemoglobin. Angina pectoris - Chest pain with the feeling of suffocation usually due to deficiency of blood supply to the myocardium resulting in ischemia to the myocardium, caused by poor coronary circulation. Anticholinergic - A drug that counteracts the action of ecetylcholine, the neurotransmitter of the parasympathetic nervous system and thereby counteracts the parasympathetic nervous system. Antiemetic - A drug that counteracts nausea and vomiting. Antisialogogue - A drug that counteracts the production of saliva. Anxiolytics - Drugs that reduce or dissolve anxiety, agitation or tension. Aorta - Very large artery receiving oxygen rich blood from the left ventricle and distributed to the peripheral circulation. Arrest rhythms - Premature ventricular contractions (PVC's), ventricular tachycardia (Vtach.), ventricular fibrillation (Vfib.), asystole, pulseless electrical activity (PEA). Artery - A vessel that carries blood away from the heart. Ascites - Accumulation of serous fluid in the abdominal cavity can be associated with advanced cases of liver disease or right sided heart failure. Asystole - Cessation of all contractions of the myocardium. Frequently follows arrest rhythms such as VTack. or VFib. Also known as "flat line".