An Ascending Dose Comparison of MVT-100 to Definity in Healthy Volunteers

Ultrasound is one of the most common imaging examinations and has advantages of absence of ionizing radiation, portability and relatively low cost. Ultrasound contrast agents are used to improve the accuracy of ultrasound and Definity (perflutren) is the world's leading ultrasound contrast agent but perflutren has to be refrigerated and has a side effect of back pain. The investigators have developed a new, improved perflutren, MVT-100, with potential for room temperature storage.

Ultrasound contrast agents are used to increase the backscatter (signal intensity of blood vessels and tissues to improve diagnostic accuracy) of ultrasound imaging. In the US ultrasound contrast agents are FDA approved for echocardiography to improve endomyocardial border definition.

MVT-100 reflects the ultrasound to provide strong back-scattering. MVT-100 microbubbles resonate with ultrasound to provide strong harmonic signals. MVT-100 microbubbles will cavitate with higher levels of ultrasound and cavitation may be stable or inertial depending upon acoustic parameters and other factors.

The study is a multi centre ascending dose comparison of Definity and MVT-100 for use in echocardiography and will be performed in a sample of healthy volunteers who are randomized to receive either Definity or MVT-100.

This trial will assess safety and evaluate the following imaging metrics:

• Determine the optimal dose of MVT-100 by comparing MVT-100 vs Definity in the change from baseline of quantitative left ventricular opacification
• Evaluation of qualitative left ventricular opacification (LVO)
• Evaluation of endocardial border delineation
• Evaluation of endocardial border length
• Evaluation of duration of useful contrast

Inclusion criteria

• Adult subjects 19 years of age or older, male or female
• Female subjects must no longer have child-bearing potential (>1-year post menopause or surgically sterilized), or must

• have a negative urine pregnancy test, and
• be using and continue to use for 30 days after the study a medically effective method of contraception
• Adequate hematologic, renal and hepatic function, as defined by:
• Absolute neutrophil count (ANC) ≥ 1.5 x 109/L
• Platelet count ≥ 100 x 109/L
• Hemoglobin ≥ 90 g/L
• Plasma creatinine< 1.5 x ULN
• Total bilirubin within normal limits (< 2.5 x ULN if Gilbert's syndrome)
• Aspartate transaminase (AST) and Alanine transaminase (ALT) < 2.5 x ULN
• Subject must be willing and able to understand the study and provide written Informed Consent to participate in the study

Exclusion criteria

• Myocardial infarction within six months prior to enrollment
• Unstable angina, NYHA Class II or greater congestive heart failure
• EKG evidence of uncontrolled arrhythmia or history of clinically significant arrhythmia within the past six months
• Clinically significant Chronic Obstructive Pulmonary Disease (COPD) or other pulmonary condition that is not controlled by medication or requires oxygen frequently or continuously
• A history of pulmonary emboli
• Known hypersensitivity to perflutren, DEFINITY® or other echo contrast agent
• Inability to remain supine for 60 minutes
• Oxygen saturation < 95% on room air
• History of allergic reaction attributed to compounds of similar chemical composition to MVT-100 or DEFINITY® or soy or egg allergies (see Investigator's Brochure)
• Subject has received any investigational drug within thirty (30) days prior to enrollment into the study
• Inability to comply with study procedures
• Subjects with any medical condition deemed by the investigator to make the subject inappropriate for participation