Abstract
Objective To assess the use of magnetic resonance imaging (MRI) to determine the varying distribution of a vaginally placed gel over time and with different levels of patient activity.
Design Prospectives interventional trial.
Setting University medical center.
PATIENT(S): One nulliparous volunteer with normal menstrual cycles and no gynecologic disease who underwent seven MRI scans of the pelvis.
INTERVENTION(S): Five mL of a commercially available topical spermicide was mixed with gadolinium-chelate magnetic resonance contrast material and introduced with a standard applicator. T1-weighted three-dimensional MRI was done to assess the distribution of the gel.
MAIN OUTCOME MEASURE(S): Gel thickness and distribution.
RESULT(S): The initial bolus of gel was delivered into the upper portion of the vagina, above the urogenital diaphragm. Thereafter, it spread into the vaginal fornices and "flattened" to cover the lateral aspects of the vagina. Without ambulation, the majority of spread was confined to the upper vagina. With ambulation and longer elapsed time, the gel spread further in the upper vagina and into the lower vagina, and significant vaginal surface coverage increased significantly.
CONCLUSION(S): Magnetic resonance imaging can be used to monitor the spread of vaginally placed products and to evaluate coverage of topical drugs used for prevention and treatment, including those used for HIV prophylaxis.
vaginal gel distribution MRI imaging, topical spermicide vaginal coverage magnetic resonance imaging, vaginal drug delivery distribution over time, gadolinium contrast vaginal gel spread imaging, vaginal medication distribution ambulation effects, MRI assessment vaginal topical products, spermicide gel coverage upper lower vagina, Barnhart vaginal gel MRI distribution, vaginal HIV prophylaxis gel coverage evaluation, topical vaginal drug delivery formulation assessment
PMID 11438341 11438341 DOI 10.1016/s0015-0282(01)01822-2 10.1016/s0015-0282(01)01822-2
Keywords
Administration, Topical, Female, Gels, Humans, Magnetic Resonance Imaging, Prospective Studies, Spermatocidal Agents/administration & Dosage/pharmacokinetics, Time Factors, Tissue Distribution, Vagina/metabolism, Walking, Gels, Spermatocidal Agents