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Definity RT Dosage

Generic name: PERFLUTREN 6.52mg in 1mL
Dosage form: injection, suspension
Drug class: Ultrasound contrast media

Medically reviewed by Drugs.com. Last updated on Mar 13, 2024.

Important Preparation and Administration Instructions

  • There are two formulations, DEFINITY and DEFINITY RT, that have differences in preparation and storage. Ensure of the correct product when following the directions for preparation and storage.
  • DEFINITY RT must be activated using the VIALMIX RFID device and diluted before administration according to the instructions outlined below.
  • DEFINITY RT is for intravenous use only and must not be administered by intra-arterial injection.
  • For adult patients, DEFINITY RT can be administered by either an intravenous bolus or infusion. The maximum dose is either two bolus doses or one single infusion. Do not administer the bolus and infusion dosing in combination or in sequence.
  • ​For pediatric patients, DEFINITY RT is administered by an intravenous bolus injection only. The maximum dose is two bolus doses.

Recommended Dosage in Adult Patients

Bolus Dosing

The recommended bolus dose in adult patients is 10 microL/kg of activated DEFINITY RT administered intravenously over 30 seconds to 60 seconds followed by a 10 mL flush of 0.9% Sodium Chloride Injection, USP. If necessary, administer a second 10 microL/kg dose followed by a second 10 mL flush of 0.9% Sodium Chloride Injection, USP 30 minutes after the first injection to prolong contrast enhancement.

Infusion Dosing

The recommended infusion dose in adult patients is 1.3 mL of activated DEFINITY RT added to 50 mL of preservative-free 0.9% Sodium Chloride Injection, USP administered intravenously. Initiate infusion at 4 mL/minute, titrating the infusion rate as necessary to achieve optimal image enhancement, not to exceed 10 mL/minute.

Recommended Dosage in Pediatric Patients

Bolus Dosing

​The recommended bolus dose in pediatric patients is 3 microL/kg of activated DEFINITY RT administered intravenously over 30 seconds to 60 seconds followed by a 5 mL flush of 0.9% Sodium Chloride Injection, USP. If necessary, administer a second bolus at a dose of 3 microL/kg to 5 microL/kg, followed by a second 5 mL flush of 0.9% Sodium Chloride Injection, USP 30 minutes after the first injection to prolong contrast enhancement.

Imaging Instructions

Adult Patients

After baseline non-contrast echocardiography is completed, set the mechanical index for the ultrasound device at 0.8 or below. Then inject activated DEFINITY RT (as described above) and begin ultrasound imaging immediately. Then inject activated DEFINITY RT (as described above) and begin ultrasound imaging immediately [see Clinical Pharmacology(12.2). Evaluate the DEFINITY RT echocardiogram images in combination with the non-contrast echocardiogram images.

Instructions for Activation, Preparation, and Handling of Definity RT

  1. Adhere to strict aseptic procedures during preparation.
  2. Activate DEFINITY RT by shaking the vial for 45 seconds using a VIALMIX RFID device.
    Note: Use only the drug activated in a properly functioning VIALMIX RFID for a full 45 second activation cycle. Do not reactivate the vial if VIALMIX RFID did not properly activate the vial. Never reactivate a successfully activated DEFINITY RT vial (see step 3).
    Refer to the VIALMIX RFID User's Guide for illustrations of the activation procedure and a properly functioning VIALMIX RFID

  3. Immediately after activation, but no more than 15 minutes, place the activated DEFINITY RT vial in the upright position and remove the flip top cap. Insert the 13mm ViaLok (Vented Vial Access Device) into the center of the rubber stopper and push down until properly engaged and locked onto the vial.

  4. Attach a syringe containing 1.4 mL preservative-free 0.9% Sodium Chloride Injection, USP to the 13mm ViaLok luer-lok hub. Add 1.4 mL of preservative-free 0.9% Sodium Chloride Injection, USP to the activated DEFINITY RT vial. Do not inject air into the DEFINITY RT vial.
  5. With the 13mm ViaLok still inserted and syringe attached, rapidly swirl the upright vial for 10 seconds to mix the contents.
  6. Activated and diluted DEFINITY RT appears as a homogenous milky white suspension with a presence of foam/bubbles. Use the product within 5 minutes of dilution. If not used within 5 minutes resuspend the microspheres by rapidly swirling the upright vial for 10 seconds before the product is withdrawn in a syringe.
  7. The activated DEFINITY RT may be used for up to 4 hours from the time of dilution, with the 13mm ViaLok still attached, but only after the microspheres are resuspended by rapidly swirling the upright vial for 10 seconds. Store the activated, diluted DEFINITY RT at room temperature 20° to 25°C (68° to 77°F) in the original product vial with the 13mm ViaLok still attached. A sterile syringe or cap should be attached to the Luer fitting on the ViaLok until use.
  8. Invert the vial and withdraw the activated homogeneous milky white suspension through the 13mm ViaLok into the syringe. Do not inject air into the DEFINITY RT vial.
  9. Use the product immediately after its withdrawal from the vial: do not allow the product to stand in the syringe.
  10. For infusion dosing in adult patients, dilute 1.3 mL of activated, diluted Definity RT further in 50 mL of preservative-free 0.9% Sodium Chloride Injection, USP.
  11. Parenteral drug products should be inspected visually for foreign particulate matter and discoloration prior to administration, whenever solution and container permit.

Instructions for RFID-Tagged Vials

The radio frequency identification (RFID) tag integrated on the back of the vial label when used with VIALMIX RFID allows for the exchange of product information such as activation time and activation rate. If the RFID tag is damaged or otherwise non-functional, the vial with the non-functional RFID tag cannot be activated with VIALMIX RFID. Discard the non-functional RFID-tagged vial. Do not activate RFID-tagged DEFINITY RT vials in the VIALMIX RFID within 6 inches (15 cm) of a pacemaker and/or defibrillator (see the VIALMIX RFID User's Guide).

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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