Adrenaline (Epinephrine): Uses, Dosage, Side Effects

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Adrenaline (Epinephrine)

Introduction

Adrenaline, also known as epinephrine, is a life-saving medication essential in emergency medicine. It plays a critical role in treating cardiac arrest, severe allergic reactions, and respiratory distress. This article provides a comprehensive overview of adrenaline’s uses, dosage, side effects, contraindications, precautions, and nursing considerations.

What is Adrenaline (Epinephrine)?

Adrenaline, also called epinephrine, is a potent sympathomimetic agent used in emergency medicine. It acts on alpha (α), beta-1 (β₁), and beta-2 (β₂) adrenergic receptors to produce cardiac stimulation, bronchodilation, and mucosal decongestion. It is widely recognized as a first-line medication in cardiac arrest, acute anaphylaxis, and severe bronchospasm.

Mechanism of Action of Adrenaline

Adrenaline is a naturally occurring catecholamine produced by the adrenal medulla. Its effects include:

  • α₁ receptor stimulation: Vasoconstriction, increased blood pressure.
  • β₁ receptor stimulation: Increased heart rate and contractility.
  • β₂ receptor stimulation: Bronchodilation and reduced airway swelling.

These combined actions make epinephrine highly effective in resuscitation and emergency care.

Adrenaline Uses

  1. Cardiac arrest (asystole, pulseless electrical activity).
  2. Anaphylactic shock and severe allergic reactions.
  3. Acute bronchospasm in asthma.
  4. Open-angle glaucoma management.
  5. Prolongation of local anesthetics in surgical procedures.
  6. Control of superficial bleeding when applied topically.

Adrenaline Dosage Guidelines

Condition Concentration Route Adult Dose
Cardiac Arrest 1:10,000 (100 µg/mL) IV (central line preferred) 10 mL every 3–5 min
Acute Anaphylaxis 1:1,000 (1 mg/mL) IM (mid-anterolateral thigh) 0.5 mg, repeat every 5 min if needed
Endotracheal Route 3–10 × IV dose ETT Dilute before administration
Continuous Infusion 1:10,000 IV infusion 2–10 µg/min, titrate to response

Important Notes:

  • Flush with at least 20 mL saline if given via peripheral line.
  • Avoid subcutaneous route in emergencies due to slower absorption.

Adrenaline Contraindications

  • Narrow-angle glaucoma.
  • Certain shock states unresponsive to adrenergic agents.
  • Lactation (unless benefits outweigh risks).
  • Tachyarrhythmias.
  • Use during labor (may delay second stage).

Adrenaline Side Effects

  • Ventricular fibrillation (life-threatening).
  • Cerebral hemorrhage.
  • Hypertension.
  • Necrosis at injection site.
  • Blurred vision, photophobia.
  • Urinary retention.
  • Headache, anxiety, tremors.

Precautions and Warnings

  • Use adrenaline cautiously in patients with cardiovascular disease due to risk of arrhythmias.
  • Monitor blood pressure closely to avoid severe hypertension.
  • Avoid extravasation during IV administration to prevent tissue necrosis.
  • Use with caution during pregnancy and lactation; only if benefits outweigh risks.
  • In patients with hyperthyroidism, adrenaline may provoke cardiac complications.

Managing Adverse Effects and Complications

  • In case of injection site pain, redness, or necrosis, apply warm compress and consult a specialist.
  • If signs of overdose appear (severe hypertension, arrhythmias, chest pain), discontinue adrenaline immediately and provide supportive care.
  • Monitor patients closely for signs of ventricular fibrillation during high-dose administration.

Nursing Considerations for Adrenaline Administration

  • Never administer 1:100 solution intravenously.
  • Use a tuberculin syringe for accurate measurement.
  • Employ electronic infusion devices for continuous infusions.
  • Continuous ECG and vital sign monitoring is essential.
  • Avoid extravasation; treat immediately if it occurs.
  • Massage IM or SC injection sites to enhance drug absorption.

Drug Interactions

  • Increased risk of hypertensive crisis: Non-selective β-blockers, MAO inhibitors, tricyclic antidepressants.
  • Reduced efficacy: Alpha or beta blockers.

Conclusion

Understanding the proper use of adrenaline is vital for effective emergency care and patient safety. Always follow dosing guidelines and monitor for side effects. For further updates on emergency medications and clinical protocols, subscribe to our blog or contact a healthcare professional.

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