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Myocardial perfusion imaging methods and compositions

a technology of myocardial perfusion and imaging methods, applied in the field of myocardial perfusion imaging methods, can solve the problems of limited use, limited usefulness of treatment with this compound, and many patients' inability to exercise at the level necessary to provide sufficient blood flow, etc., and achieve the effect of facilitating myocardial imaging

Inactive Publication Date: 2005-01-27
GILEAD SCI INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In all of the methods above, at least one radionuclide is administered before, with or after the administration of the A2A receptor agonist to facilitate myocardial

Problems solved by technology

Unfortunately, many patients are unable to exercise at levels necessary to provide sufficient blood flow, due to medical conditions such as peripheral vascular disease, arthritis, and the like.
Dipyridamole is an effective vasodilator, but side effects such as pain and nausea limit the usefulness of treatment with this compound.
However, its use is limited due to side effects such as flushing, chest discomfort, the urge to breathe deeply, headache, throat, neck, and jaw pain.
Additionally, the short half-life of adenosine necessitates multiple treatments during the procedure, further limiting its use.
In general, compounds such as these have a high affinity for the A2A receptor, and consequently, a long duration of action, which is undesirable in imaging.

Method used

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  • Myocardial perfusion imaging methods and compositions
  • Myocardial perfusion imaging methods and compositions
  • Myocardial perfusion imaging methods and compositions

Examples

Experimental program
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Effect test

examples

Three different aqueous pharmaceutical CVT-3146 formulations were used in the Examples below.

Examples 1-7 employed aqueous pharmaceutical compositions (a) and (b) below. Pharmaceutical compositions (a) and (b) were aseptically filled into 10 mL type I glass vials. (a) An aqueous pharmaceutical composition consisting of 200 micrograms / mL of CVT-3146 in 0.5 (w:v) methylboronic acid buffered with sodium bicarbonate to a pH of 9.3. (b) An aqueous pharmaceutical composition including 200 micrograms / mL of CVT-3146, 0.1% (w:v) methylboronic acid, 50 mM sodium bicarbonate buffer adjusted to pH 9.3 with the addition of 0.55% (w:v) NaCl to make an isotonic pharmaceutical composition.

Example 8 employed a pharmaceutical composition consisting of an aqueous composition of 100 micrograms / mL CVT-3146 in 15% (w:v) propylene glycol and 100 mM phosphate buffer at pH 7 with 0.1% EDTA. The formulation was stored in type I glass vials at 5 mL per vial.

example 1

BACKGROUND: CVT-3146 (CVT), with an initial half-life of 3 minutes with a rapid onset and offset of action, is >100-fold more potent than adenosine (Ado) in increasing coronary blood flow velocity (CBFv) in awake dogs. The purpose of this open label study was to determine the magnitude and duration of effect of CVT-3146 (10-500 μg) on CBFv in humans.

METHODS: Patients undergoing a clinically indicated coronary catheterization with no more than a 70% stenosis in any coronary artery and no more than a 50% stenosis of the study vessel had CBFv determined by Doppler flow wire. Study subject were selected after measuring baseline and peak CBFv after an intracoronary (IC) injection of 18 μg of Ado. Twenty-three patients, who were identified as meeting the study criteria of having a peak to baseline CBFv ratio of ≧2.5 in response to Adenosine, received a rapid (≦10 sec) peripheral IV bolus of CVT-3146; Doppler signals were stable and interpretable over the time-course of the increase in ...

example 2

This example is a study performed to determine the range of dosages over which the selective A2A receptor agonist, CVT-3146 can be administered and be effective as a coronary vasodilator.

The study included patients undergoing a clinically indicated coronary catheterization with no more than a 70% stenosis in any coronary artery and no more than a 50% stenosis of the study vessel had CBFv determined by Doppler flow wire. Study subject were selected after measuring baseline and peak CBFv after an intracoronary (IC) injection of 18 μg of Ado. 36 subjects were identified as meeting the study criteria of having a peak to baseline CBFv ration of ≧2.5 in response to Adenosine, CVT-3146 was administered to the study subjects by IV bolus in less that 10 seconds in amounts ranging from 10 μg to 500 μg.

The effectiveness of both compounds was measured by monitoring coronary flow velocity. Other coronary parameters that were monitored included heart rate and blood pressure. These parameters...

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Abstract

A myocardial imaging method that is accomplished by administering one or more adenosine A2A adenosine receptor agonist to a human undergoing myocardial imaging as well as pharmaceutical compositions comprising at least one A2a receptor agonist, at least one liquid carrier, and at least one co-solvent.

Description

BACKGROUND OF THE INVENTION (1) Field of the Invention This invention relates to myocardial imaging methods that are accomplished by administering doses of one or more adenosine A2A adenosine receptor agonists to a mammal undergoing myocardial imaging. This invention also relates to pharmaceutical compositions useful in myocardial imaging methods. (2) Description of the Art Myocardial perfusion imaging (MPI) is a diagnostic technique useful for the detection and characterization of coronary artery disease. Perfusion imaging uses materials such as radionuclucides to identify areas of insufficient blood flow. In MPI, blood flow is measured at rest, and the result compared with the blood flow measured during exercise on a treadmill (cardiac stress testing), such exertion being necessary to stimulate blood flow. Unfortunately, many patients are unable to exercise at levels necessary to provide sufficient blood flow, due to medical conditions such as peripheral vascular disease, arth...

Claims

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Application Information

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IPC IPC(8): A61K31/7076
CPCA61K31/7076A61K2300/00
Inventor BELARDINELLI, LUIZROSNER, MITCHELL
Owner GILEAD SCI INC
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