MRI Temperature Mapping of the Prostate and Urogenital Pelvis Cooled by an Endorectal Balloon

Completed

• Conditions: Prostate Cancer; Erectile Dysfunction; Hypothermia; Urinary Incontinence

• Registration Number: NCT01979848
• Lead Sponsor: University of California, Irvine

Brief Summary

Urinary incontinence and sexual dysfunction are potential side effects for men undergoing the successful removal of the cancerous prostate via surgery. Hypothermic cooling via the investigational Endorectal Cooling Balloon has been shown by our group to significantly reduce long term urinary incontinence and may reduce sexual dysfunction in men after robotic prostatectomy, and improve the patient's long term quality of life (QOL). However before successful translation of the endorectal balloon can proceed into the world wide usage, we must understand:

1. How effectively the tissues for continence and sexual function are cooled within the pelvis.

2. What is the capacity of vascularized structures (i.e. the neurovascular bundle) to 'cool sink' or diminish the effective cooling and

3. Determine if the endorectal balloon can be re-designed for improved QOL outcomes in men.

This research study marries two new techniques of Thermal MRI imaging and Endorectal cooling for prostate cancer surgery. MRI is non-invasive. A simple confirmation of effective hypothermic cooling can be achieved by novel MRI thermal mapping of the cooling gradient as it comprehensively sweeps through the rectum across the urogenital pelvis. MRI with temperature adaptive software can accurately map these gradients with non-invasive technique, and answer formidable questions of the effectiveness of hypothermic cooling of the prostate and its direct translation into improved continence and sexual function after surgery. The purpose of this research study is to use Magnetic Resonance Imaging (MRI) and Thermal MRI with subjects who will receive the investigational endorectal cooling balloon to help further understand how the cooling balloon works, which may translate to other uses in the future, including the diagnosis of patients at a high risk of developing prostate cancer.

Detailed Description

Prostate cancer is the second most frequent cause of cancer death in men and it accounts for 11% of all male cancers. Radical prostatectomy remains the gold standard for localized disease, offering the advantage of precise staging and grading and the real possibility of disease eradication. In the US there are approximately 100,000 radical prostatectomies (RP) performed for prostate cancer annually. However, there are two major challenges to the quality of life outcomes after radical prostatectomy: preserving urinary continence, and sexual function. The quality of life (QOL) after radical prostatectomy relies on the return of continence and sexual function after surgery to their pre-operative 'normal' status. The main factor which determines potency rates for patients is whether or not the nerves at the Neurovascular Bundles (NVB), are spared, and it may take years for sexual function to return. This may be due to the nerve injury from the nerve trauma in the surgical procedure. Similarly, a major factor involved in post-radical prostatectomy incontinence is preservation of the nerves that control the external urethral sphincter, bladder, and urogenital diaphragm. Also Inflammation from surgical removal of the prostate not only affects nerves, but also may directly damage the bladder, urethra, and pelvic floor. Effective strategies to prevent this damage are currently lacking. One stratagem to prevent or minimize such damage, is the use of local hypothermia with ice or cold irrigation around the nerves and tissues prior to, during, and after the injury has occurred. In numerous experimental models of central and peripheral nervous system injury, the use of moderate hypothermia (i.e. 28-33oC) has been shown to provide dramatic neuroprotection safely in humans, during cardiac, kidney, and brain surgery for many years.

Study Timeline

• Study Start: 2013-06
• Study First Submitted: 2013-11-01
• Study First Submitted QC: 2013-11-01
• Study First Posted: 2013-11-08
• Primary Completion: 2015-11
• Study Completion: 2015-11
• Status Verified: 2016-12
• Last Update Submitted: 2016-12-12
• Last Update Posted: 2016-12-13

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Male
• Target Recruitment: 3

Inclusion Criteria

1. A male older than 21 years of age and under age of 80 who does not have prostate cancer and is not enrolled in UCI HS# 2008-6397 (2 male adults to test the MR Temperature Mapping calibration).

   a. CONTROLS: Option for two non-cancer adult male volunteers > 21 years old, to test MR Temperature Mapping calibration. These men are not scheduled for / will not undergo the prostatectomy and related thermometry MRI.

2. A male older than 40 years of age who has confirmed prostate cancer and has decided to receive prostatectomy; and have enrolled in UCI HS# 2008-6397 or will be receiving the Endorectal Cooling balloon outside of UCI HS# 2008-6397 as part of a compassionate use.

Exclusion Criteria

1. Have implanted prosthetic heart valves, pacemaker, neuro-stimulation devices, surgical clips (hemostatic clips) or other metallic implants,
2. Have engaged in occupations or activities which may cause accidental lodging of ferromagnetic materials, or have imbedded metal fragments from military activities,
3. Have a history of renal disease and determined by the doctor not suitable for receiving injection of MR contrast agent,
4. Unable to lie down still for 60 minutes.
5. Woman or minor

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Describe cooling based on MRI thermal mapping in terms a) change in temperature over time at 5 locations and by b) thermal map of tissue volume at various time points	One session MRI thermal mapping	During pre and post hypothermia, initial temperatures will be measured simultaneously on five 3-mm-thick image slices that covered the target. The thermometry scan can be repeated every 6 s. Tissue temperature map is measured by magnetic resonance thermometry (echo planar imaging with multiphase; field of view: 25 × 25 cm; matrix 256 × 256; number of excitations: 1; repetition time: 545 ms; echo time: 20 ms; flip angle: 20°; slice thickness: 3 mm); (b) a thermal map of the tissue volume will be superimposed on the anatomical image.

Secondary Outcome Measures

Name	Time	Method
Describe associations between temperature (at 5 locations) and time to continence.	30 days and 60 days after Robotic surgery	Before the subject's scheduled radical prostatectomy surgery, they will have an MRI combined with an cooling endorectal balloon (this study), which will 1. Show the dimensions of their lower pelvis, including the prostate, and 2.Measure how cold the tissue around the prostate becomes using the cooling balloon. The thermal MRI images will allow elucidation of temperatures at specified anatomic locations and their changes over time. Data will be described using means for normally distributed continuous variables. We will test for associations between temperature and continence using t-tests to compare temperature change between those who achieve continence at 30 and 60 days and those who do not.

Trial Locations

Locations (1)

University of California, Irvine Medical Center; 🇺🇸 Orange, California, United States