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Norepinephrine
Aka: Norepinephrine, Levarterenol, L-norepinephrine
- History
- Ulf Von Euler won 1970 Nobel Prize for its discovery
- Swedish Chemist also discovered Prostaglandins
- Mechanism
- Naturally occurring Catecholamine
- Beta 1 Adrenergic Receptor Agonist
- Similar potency to Epinephrine
- Increases myocardial contractility
- No Beta 2 Adrenergic Receptor Activity
- Potent Alpha Adrenergic Receptor Agonist
- Potent arterial and venous Vasoconstriction
- Indications
- Hemodynamically significant Hypotension
- Refractory to other Sympathomimetic amines
- Useful in Low Systemic Vascular Resistance
- Septic Shock
- Neurogenic Shock
- Temporizing measure only
- Relative Contraindications
- Acute Myocardial Infarction
- Use as agent of last resort
- Monitoring
- Monitor Blood Pressure accurately
- Consider Arterial Line with continuous monitoring
- Blood Pressure cuff monitoring every 5 minutes
- Consider advanced hemodynamic monitoring
- Cardiac output
- Pulmonary wedge pressure
- Peripheral arterial resistance
- Precautions
- Use as temporizing measure only
- Use extreme caution in Myocardial Ischemia
- Increases myocardial oxygen requirements
- No compensatory increase in coronary perfusion
- Observe for arrhythmias
- Volume depleted patents
- Limited myocardial reserve
- Use Norepinephrine only via central venous catheter
- Extravasation causes severe local tissue damage
- Antidote for extravasation
- Phentolamine 5-10 mg diluted in 10-15 ml NS
- Infiltrate area of extravasation with Phentolamine
- Preparation
- Start with Norepinephrine (1 mg/ml) 4 ml ampule
- Mix 4 ml Norepinephrine in 250 ml D5W or Normal Saline
- Final Concentration: 16 ug/ml Norepinephrine
- Dosing: Infusion via Central Venous Catheter
- Start: 0.5 to 1.0 ug/min
- Titrate to Systolic Blood Pressure over 90 mmHg
- Average Adult Dose: 2 to 12 ug/min
- Refractory Shock: up to 30 ug/min