Antianginal Drugs Flashcards
Atenolol
Chemical Classification
Beta-Blocker, Beta1-, Beta2-blocker (high doses)
Atenolol
Functional Classification
Antihypertensive, antianginal
Atenolol
Mechanism of Action
Completely blocks stimulation of beta-adrenergic receptor within vascular smooth muscle; produces negative chronotropic activity (decreases rate of SA node discharge, increases recovery time), slows conduction of AV node, decreases heart rate, negative inotropic activity decreases O2 consumption in myocardium; decreases action of renin-aldosterone-angiotensin system at high doses, inhibits Beta2-receptors in bronchial system at higher doses
Atenolol
Uses
Mild to moderate hypertension, prophylaxis of angina pectoris; suspected or known MI (IV use); MI prophylaxis
Atenolol
Contraindications
Pregnancy (D), hypersensitivity to Beta-blockers, cardiogenic shock, 2nd- or 3rd-degree heart block, sinus bradycardia, cardiac failure, Raynaud’s disease, pulmonary edema
Atenolol
Side Effects
CNS: Insomnia, Fatigue, Dizziness, Mental Changes, memory loss, hallucinations, depression, lethargy, drowsiness, strange dreams, catatonia
CV: PROFOUND HYPOTENSION, BRADYCARDIA, CHF, Cold Extremities, Postural Hypotension, 2nd- or 3rd-degree Heart Block
EENT: sore throat; dry, burning eyes; blurred vision; stuffy nose
ENDO: increase hypoglycemic response to insulin
GI: Nausea, Diarrhea, vomiting, MESENTERIC ARTERIAL THROMBOSIS, ISCHEMIC COLITIS
GU: impotence, decreased libido
HEMA: AGRANULOCYTOSIS, THROMBOCYTOPENIA PURPURA
INTEG: rash, fever, alopecia
RESP: BRONCHOSPASM, dyspnea, wheezing, pulmonary edema
Atenolol
Nursing Considerations
ASSESS:
- I&O, weight daily; watch for CHF (rales/crackles, jugular vein distention, weight gain, edema)
- Hypertension: BP, pulse q4hr; note rate, rhythm, quality; apical/radial pulse before administration; notify prescriber of any significant changes (<50 bpm); ECG
- Baselines in renal/hepatic studies before therapy begins
Atenolol
Overdose Treatment
Lavage, IV atropine for bradycardia, IV theophylline for bronchospasm, dextrose for hypoglycemia, digoxin, O2, diuretic for cardiac failure, hemodialysis
Diltiazem (Cardizem)
Functional Classification
Calcium Channel Blocker, antiarrhythmic class IV, antihypertensive
Diltiazem (Cardizem)
Chemical Classification
Benzothiazepine
Diltiazem (Cardizem)
Mechanism of Action
Inhibits calcium ion influx across cell membrane during cardiac depolarization; produces relaxation of coronary vascular smooth muscle, dilates coronary arteries, slows SA/AV node conduction times, dilates peripheral arteries
Diltiazem (Cardizem)
Uses
PO: Angina pectoris due to coronary artery spasm, hypertension
IV: atrial fibrillation, flutter, paroxysmal supraventricular tachycardia
Diltiazem (Cardizem)
Contraindications
Sick sinus syndrome, AV heart block, hypotension <90mmHg systolic, acute MI, pulmonary congestion, cardiogenic shock
Diltiazem (Cardizem)
Side Effects
CNS: Headache, Fatigue, Drowsiness, dizziness, depression, weakness, insomnia, tremor, paresthesia
CV: DYSRHYTHMIA, Edema, CHF, bradycardia, hypotension, palpitations, HEART BLOCK
GI: Nausea, vomiting, diarrhea, gastric upset, Constipation, increased LFTs
GU: nocturia, polyuria, ACUTE RENAL FAILURE
INTEG: Rash, flushing, photosensitivity, burning pruritus at inj site
RESP: rhinitis, dyspnea, pharyngitis
Diltiazem (Cardizem)
Nursing Considerations
ASSESS:
- CHF: dyspnea, weight gain, edema, jugular venous distention, rales; monitor I&O ratios daily, weight
- ANGINA: location, duration, alleviating factors, activity when pain starts
- DYSRHYTHMIAS: cardiac status: BP, pulse, respiration, ECG and intervals PR, QRS, QT; if systolic BP <50 bpm, hold dose, notify prescriber