Dobutamine is a synthetic catecholamine and beta-1 adrenergic agonist used primarily to treat acute heart failure and cardiogenic shock.
Key Points:
- Mechanism of Action:
Stimulates β1-adrenergic receptors → increases cardiac contractility (positive inotropy) and stroke volume, with mild effect on heart rate.
Also has weak β2 and α1 activity, causing minimal vasodilation or vasoconstriction, depending on dose. - Indications:
- Acute decompensated heart failure
- Cardiogenic shock
- Stress echocardiography (to induce cardiac stress)
- Route:
Intravenous (IV) infusion only - Onset/Duration:
Rapid onset within 1–2 minutes; short half-life (~2 minutes), effects stop quickly after infusion ends. - Adverse Effects:
- Tachycardia
- Arrhythmias
- Hypertension (rare)
- Myocardial ischemia in high doses or patients with coronary disease
- Monitoring:
Continuous ECG, blood pressure, and urine output monitoring are essential during infusion.
Let me know if you want a table or comparison with other inotropes like dopamine or milrinone.