About Clevidipine Infusion Calculations

This Clevidipine Infusion calculator is designed to assist healthcare professionals in accurately determining infusion parameters for this ultra-short-acting calcium channel blocker. Clevidipine is administered as a continuous intravenous infusion, requiring precise calculations to manage acute hypertension effectively. The tool helps convert a desired dose (mg/hr) into an infusion pump rate (mL/hr) and vice-versa, ensuring dosing accuracy and patient safety.

Understanding the Calculator's Outputs

The calculator provides several key outputs based on your inputs:

• Infusion Rate (mL/hr): The speed at which the infusion pump should be set to deliver the desired dose.
• Dose (mg/hr): The amount of active medication the patient receives per hour at a given infusion rate.
• Lipid Calories (kcal/hr): Clevidipine is formulated in a 20% lipid emulsion, providing 2 kcal/mL. This value helps track caloric intake from the medication, which is crucial for patients on lipid-restricted diets or parenteral nutrition.
• Total Volume/24h (mL): The total volume of fluid the patient will receive from the infusion over a 24-hour period. This is important for fluid management.
• Safety Alerts: The tool will generate warnings for high doses (>21 mg/hr) associated with reflex tachycardia and alerts when the total daily volume exceeds 1000 mL, which surpasses the recommended daily lipid load from this source.

How to Use This Calculator

Follow these steps for an accurate calculation:

1. Select Calculation Mode: Choose whether you want to calculate the Infusion Rate from a known Dose or the Dose from a known Infusion Rate.
2. Enter Clevidipine Concentration: Select the standard concentration (0.5 mg/mL) from the dropdown or choose "Custom" to enter a different value if using a non-standard preparation.
3. Input the Known Value: Enter the desired dose in mg/hr or the current infusion rate in mL/hr, depending on the mode you selected.
4. Review the Results: The calculator will instantly display the calculated parameters and any relevant safety alerts. The titration reference table will also update based on the selected concentration.

Clevidipine Dosing Overview

Adherence to established dosing guidelines is critical for patient safety and efficacy.

• Initial Dose: Start the infusion at 1-2 mg/hr.
• Titration: The dose can be doubled at 90-second intervals initially. As blood pressure approaches the target, increase the time between adjustments to every 5-10 minutes and use smaller dose increments (less than double).
• Maximum Dose: The recommended maximum dose is 32 mg/hr. Most patients achieve blood pressure control at doses of 16 mg/hr or less.

Switching to Oral Antihypertensive Agents

Once the patient's blood pressure is stable and they are able to take oral medications, a transition from IV Clevidipine to an oral agent should be initiated. Clevidipine has a rapid offset of action, so the infusion should be down-titrated or discontinued cautiously while establishing the efficacy of the oral therapy to avoid loss of blood pressure control.

Managing Infusion Interruptions

Due to its ultra-short half-life (approximately 1 minute), any interruption in the Clevidipine infusion will result in a rapid return to pre-treatment blood pressure levels. If the infusion is paused or stopped, it should be re-initiated at a low dose (e.g., 1-2 mg/hr) and titrated upwards again as clinically indicated, closely monitoring the patient's blood pressure response.

Safety Alerts and Monitoring

Key safety considerations during Clevidipine administration include:

Frequently Asked Questions (FAQ)

Why does the calculator warn about total volume over 1000 mL per day?
Clevidipine is delivered in a lipid emulsion. The prescribing information recommends a maximum of 1000 mL over 24 hours to limit the lipid load, which can be significant in critically ill patients. This calculator alerts you when that threshold is crossed.

How is the infusion rate calculated from the dose?
The formula is: Infusion Rate (mL/hr) = Desired Dose (mg/hr) / Concentration (mg/mL). The calculator performs this conversion for you.

Can I use a custom Clevidipine concentration?
Yes. While 0.5 mg/mL is standard, the calculator allows you to select "Custom" and input a specific concentration if your institution uses a different preparation. The titration table will adjust accordingly.

What should I do if the patient's blood pressure is not responding?
Titrate the dose according to guidelines, doubling every 90 seconds initially. If blood pressure remains uncontrolled at the maximum dose of 32 mg/hr, other underlying causes or the need for an alternative agent should be considered.

What does the "reflex tachycardia" warning mean?
Rapid reduction in blood pressure can trigger a compensatory increase in heart rate, known as reflex tachycardia. This is more common at higher doses of Clevidipine (>21 mg/hr). Close cardiac monitoring is necessary.

Is Clevidipine compatible with other IV lines?
Clevidipine should ideally be administered through a dedicated line. Co-administration with other drugs has not been extensively studied. Always consult your institution's compatibility charts and the official prescribing information.

How long can a single vial/bottle be used after spiking?
A single vial or bottle of Clevidipine emulsion should be used within 12 hours of the stopper being punctured to minimize the risk of microbial growth.

What is the concentration of the standard Clevidipine infusion?
The standard ready-to-use Clevidipine emulsion has a concentration of 0.5 mg/mL.

References

1. Cleviprex® (clevidipine) Prescribing Information. U.S. Food and Drug Administration. Accessed October 2023.
2. Aronson S, Dyke CM, Stierer KA, et al. The ECLIPSE trials: comparative studies of clevidipine to nitroglycerin, sodium nitroprusside, and nicardipine for acute hypertension treatment in cardiac surgery patients. Anesth Analg. 2008;107(4):1110-1121. doi:10.1213/ane.0b013e31818240db
3. Pollack CV Jr, Varon J, Garrison NA, et al. Clevidipine, an intravenous dihydropyridine calcium channel blocker, is safe and effective for the treatment of patients with acute severe hypertension. Ann Emerg Med. 2009;53(3):329-338. doi:10.1016/j.annemergmed.2008.04.032
4. Whelton PK, Carey RM, Aronow WS, et al. 2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APhA/ASH/ASPC/NMA/PCNA Guideline for the Prevention, Detection, Evaluation, and Management of High Blood Pressure in Adults: A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines. Hypertension. 2018;71(6):e13-e115. doi:10.1161/HYP.0000000000000065