Skip to main content

Dashboard 2027 Blueprint Start here

Practice Questions Mock NBRC Exam AI Tutor Flashcards Smart Notes Post-Exam Plan

Simulation Suite Respiratory Encounters Ventilator Simulator Ventilator Case Lab Daily Rounds Shift Simulator Alarm Trainer Decision Trees

Log in Start free

Clinical References

Pharmacology

Loading the Learning Center…

RRT Academy is an independent educational platform and is not affiliated with, endorsed by, or sponsored by any university, college, hospital, ventilator manufacturer, the NBRC, or CoARC. Content is for educational purposes only and is not for clinical decision-making.

Learning Center/Pharmacology/Dobutamine

vasopressor

Dobutamine

Dobutrex

Route: IV
Onset: 1–2 minutes
Duration: Minutes; continuous infusion

Mechanism of action

Synthetic catecholamine. Primarily beta-1 agonist (inotropic and chronotropic). Mild beta-2 effects (mild vasodilation). Negligible alpha effects — does NOT raise SVR.

Dosing

Adult: 2.5–20 mcg/kg/min IV continuous infusion

Indications

Cardiogenic shock (low cardiac output, high filling pressures)
Acute decompensated heart failure
Stress echocardiography agent

Contraindications

Hypertrophic obstructive cardiomyopathy (HOCM)
Uncorrected hypovolemia
Idiopathic hypertrophic subaortic stenosis

Side effects

Tachycardia
Tachyarrhythmias
Hypotension (due to beta-2 vasodilation)
Increased myocardial O2 demand
Hypokalemia

Monitoring parameters

HR and ECG (arrhythmia)
Blood pressure
Cardiac output / CVP
Urine output

Drug interactions

Beta-blockers (antagonize inotropic effect)
MAOIs (exaggerated cardiovascular response)

NBRC high-yield

Inotrope — increases cardiac contractility and output
Beta-1 dominant — NO alpha effects; does not raise SVR
Can cause HYPOTENSION (beta-2 vasodilation) — unlike dopamine at high doses
Use in cardiogenic shock; NOT for septic shock
Avoid in HOCM (dynamic outflow obstruction worsens)

Clinical pearls

INOTROPE — increases cardiac output without vasoconstriction (key distinction from dopamine at high doses)
May cause hypotension due to beta-2 vasodilation — combine with vasopressor if needed
Preferred inotrope in cardiogenic shock (e.g., decompensated CHF)
Does NOT substitute for norepinephrine in septic shock (no alpha effects)
Used in stress echo to increase cardiac demand and unmask ischemia

Mnemonic

DOBUTamine: DO BooT Up the heart (inotrope — pumps harder, not harder BP)

Dobutamine (Dobutrex) — Respiratory Pharmacology