Nitrogen-filled liposomes as a vascular US contrast agent

Preliminary evaluation

Evan C Unger, Pamela J. Lund, De Kang Shen, Thomas A. Fritz, David Yellowhair, Terri E. New

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

Liposomes with a mean diameter of 1-2 μm were made to entrap nitrogen gas and tested as an ultrasound (US) contrast agent. The gas-filled liposomes, or Aerosomes (ImaRx Pharmaceutical, Tucson) were tested in vitro for size, stability, reflectivity, and acoustic characterization, and were tested in vivo for acute toxicity in mice and for cardiac imaging in rabbits after intravenous injection. Aerosomes have much greater reflectivity and higher attenuation than do standard liposomes and retain their acoustic properties after storage in aqueous media for several months. The interpolated median lethal dose of Aerosomes is approximately 2.5 mmol of lipid per kilogram, and the imaging dose is under 5 μmol of lipid per kilogram, yielding a potential therapeutic index of over 500 to 1. Postcontrast US images showed sustained enhancement of all four cardiac chambers as well as enhancement in the aorta, vena cava, and hepatic veins. Aerosomes hold promise as a contrast agent for cardiac and blood-pool imaging. Further work is in progress to characterize and develop this novel US contrast agent.

Original languageEnglish (US)
Pages (from-to)453-456
Number of pages4
JournalRadiology
Volume185
Issue number2
StatePublished - Nov 1992

Fingerprint

Liposomes
Contrast Media
Blood Vessels
Nitrogen
Acoustics
Gases
Lipids
Venae Cavae
Hepatic Veins
Intravenous Injections
Aorta
Rabbits
Pharmaceutical Preparations
Therapeutics
In Vitro Techniques

Keywords

  • Blood, US, 9*.12988
  • Contrast media, experimental studies, 9*.12988
  • Heart, US, 521.12981
  • Liposomes
  • Ultrasound (US), contrast media, 9*.12988

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology

Cite this

Unger, E. C., Lund, P. J., Shen, D. K., Fritz, T. A., Yellowhair, D., & New, T. E. (1992). Nitrogen-filled liposomes as a vascular US contrast agent: Preliminary evaluation. Radiology, 185(2), 453-456.

Nitrogen-filled liposomes as a vascular US contrast agent : Preliminary evaluation. / Unger, Evan C; Lund, Pamela J.; Shen, De Kang; Fritz, Thomas A.; Yellowhair, David; New, Terri E.

In: Radiology, Vol. 185, No. 2, 11.1992, p. 453-456.

Research output: Contribution to journalArticle

Unger, EC, Lund, PJ, Shen, DK, Fritz, TA, Yellowhair, D & New, TE 1992, 'Nitrogen-filled liposomes as a vascular US contrast agent: Preliminary evaluation', Radiology, vol. 185, no. 2, pp. 453-456.
Unger EC, Lund PJ, Shen DK, Fritz TA, Yellowhair D, New TE. Nitrogen-filled liposomes as a vascular US contrast agent: Preliminary evaluation. Radiology. 1992 Nov;185(2):453-456.
Unger, Evan C ; Lund, Pamela J. ; Shen, De Kang ; Fritz, Thomas A. ; Yellowhair, David ; New, Terri E. / Nitrogen-filled liposomes as a vascular US contrast agent : Preliminary evaluation. In: Radiology. 1992 ; Vol. 185, No. 2. pp. 453-456.
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