Critical Care and Titration Calculations

Overview

Critical care medications, such as vasopressors, are often ordered in micrograms per kilogram per minute (mcg/kg/min). These calculations are complex because they involve weight, time, and very small units of measurement. Nurses must be able to convert these orders into mL/hr to program infusion pumps accurately and adjust them based on real-time hemodynamic monitoring.

Key nursing concepts

• Conversion between milligrams and micrograms.
• Incorporation of patient weight into the time-based calculation.
• Calculation of the infusion rate in mL/hr from a mcg/kg/min order.
• Understanding the therapeutic objectives of titration (e.g., maintaining MAP).
• Calculation of the concentration of the drug in the IV bag.
• Safety limits for maximum infusion rates of potent vasoactive drugs.

Important nursing considerations

• Monitor the patient's blood pressure and heart rate every 5 to 15 minutes.
• Ensure the infusion is delivered through a central line if possible.
• Verify the medication concentration (mg in mL) before starting the pump.
• Use a microdrip or volumetric pump for precise delivery.
• Titrate the medication slowly and strictly according to the provider's parameters.
• Assess the IV site for extravasation, which can cause tissue necrosis.

Patient teaching

• Explain that the medication is helping to support heart and blood pressure.
• Inform the patient that they will be monitored very closely with frequent checks.
• Advise the patient to report any chest pain or headache immediately.
• Explain the purpose of the various monitors and alarms in the room.

Related practice questions

Real questions from the NursGuru bank, each with the answer and rationale.

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Critical Care and Titration Calculations flashcards

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