Use of Hypothermia During Robotic Prostatectomy

Hypothermic Nerve Sparing Radical Prostatectomy

Robotic assisted laparoscopic radical prostatectomy (RLP) has gained widespread acceptance as a standard treatment for clinically localized prostate cancer. Despite the enhanced visualization and precise dissection afforded by the robotic platform, two major comorbidities affect a significant number of men: incontinence and erectile function.

Urinary continence and erectile function

It is commonly believed that the most important factor affecting continence is preservation of the external urinary sphincter complex which lies just below the prostate. Trauma to the urethral tissue itself after it is transected from the prostate and damage to the autonomic nerves that control this sphincter may lead to sphincteric dysfunction. In addition, dissection of the bladder may lead to bladder irritability which also plays a role in incontinence. Surgical removal of the prostate also causes significant inflammatory damage to the pelvic floor which likely delays recovery of urinary continence. The same trauma issues apply to sexual function.

One possible method to protect the nerves and other tissues from operative trauma may be the use of local hypothermia (cold-ischemia) to the pelvis. Local tissue hypothermia using ice, ice slush, or cold irrigation has been safely and routinely used for decades in humans during brain, heart, and kidney surgery to minimize organ damage. Yet, this technique has never been applied to prostate surgery. We will accomplish local cooling of the pelvis using a cooling balloon inserted into the rectum. The cooling balloon is powered by an FDA approved cooling system developed by Innercool therapies. Temperatures of 57-86 degrees F (22+/-8 degrees C).

Study Overview

• Status: Completed
• Conditions: Prostate Cancer
• Intervention / Treatment: Device: UroCool

Detailed Description

2. 1. Selection of the Patients From June 2002 to August 2015, a total of 1,503 patients underwent RARP. During this period, perioperative data, including postoperative functional outcomes, were prospectively collected using a customized database; our ethics committee approved the data collection. Erectile function was assessed using the sexual health profile for men (SHIM) score at 3, 9, 15, and 24 months and then annually after surgery, and the duration of pad-free continence recovery was asked by a non-physician third party. In our institution, RH was applied during RARP for all patients from February 2008 to March 2015 (consecutively between the 671st and 1459th cases). Among the recruited patients, 789 men (52.6%) underwent HP, leaving the other 711 (47.4%) as controls.

The inclusion criteria for this study were as follows: (1) bilateral nerve-sparing RARP (over 70%) and (2) a minimum follow-up of 15 months. The exclusion criteria were as follows: (1) men with a history of salvage radiation therapy, chemotherapy, or hormone therapy after RARP (n=98) and (2) the presence of a high-risk disease with an initial prostate-specific antigen (PSA) level over 20 ng/ml or biopsy Gleason score over 8, which may influence the refining surgical plane around the neurovascular bundle (NVB), thereby affecting the degrees of nerve-sparing strategy at the time of surgery (n=275). Further, (3) the initial 100 cases were excluded to avoid potential bias from the learning period. From a cohort of 1,503 patients, 59 (3.92%) men whose potency outcome within 15 months was not assessed were also excluded from the study. Finally, 930 patients were selected for the analysis; half of the procedures (n=466, 50.1%) were performed under RH and the remaining other half (n=464, 49.9%) as normothermal controls.

2. 2. Endpoints of the Study The primary endpoints of this study were the SHIM score and the rate of potency regain, which was defined as a SHIM score >17 in the RH and control groups 15 months after surgery. Considering the proven impacts of age and preoperative SHIM scores on the recovery of potency, the groups were further divided into the young and potent (YP: age <65 years and SHIM score ≥22, n=409, 43.9%) subgroup and susceptible for impotency (SI: age ≥65 years or SHIM score <22, n=512, 55.1%) counterpart and investigated the sexual function of the YP subgroup. The secondary endpoints were the duration of pad-free continence regain and the rate of continence recovery within 3 months after surgery, especially in the YP subgroup.

2.3. Surgical Protocol for RH All procedures were performed by a single surgeon. RH was achieved by devising an endorectal cooling balloon system (ECB) as previously reported [2, 4, 5]. In brief, a 40-cm, 24-F, 3-way latex urethral catheter was placed inside a 5 × 2.5-inch elliptic latex balloon that distended at a low pressure and conformed to the rectal wall without excessive deformations. The lubricated ECB was inserted just inside the anus and anchored by inflating the catheter balloon to 20 ml. The ECB was then distended and cycled continuously with cold saline (4°C) by gravity 40 cm above the patient. The ECB volume was ~200 ml. A 9-F esophageal probe (Smiths Medical ASD, Rockland, MA) was used to obtain the intracorporeal temperature readings directly along the anterior surface of the rectum/NVB.

• Study Type: Interventional
• Enrollment (Actual): 738
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • California
    • Orange, California, United States, 92868
      • University of California, Irvine Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: Male

Description

Inclusion Criteria:

• adult males
• receiving robotic radical prostatectomy for the treatment of prostate cancer

Exclusion Criteria:

• previous radiation
• previous cryotherapy

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Hypothermia Only OR; Use of Hypothermia Cooling device only in the operating room. Intervention is Hypothermia Cooling Device.	Device: UroCool; Hypothermia Endorectal Device
Active Comparator: Hypothermia in OR + Recovery; Use of hypothermia cooling device in the operating room and up to five hours after surgery is intervention.	Device: UroCool; Hypothermia Endorectal Device

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Feasibility and Safety Using an Improved, More Efficient and Less Labor Intensive Cooling Balloon in Patients Undergoing Hypothermic Nerve-sparing RLP in Participants Determined by Return to Continence	The primary aim is confirmation of the feasibility and safety using an improved, more efficient and less labor intensive cooling balloon in patients undergoing hypothermic nerve-sparing RLP. Continence is defined as no protective urinary pad use as reported by the patient in response to the very first question on page 1 of the sample questionnaire.	During and 6 hours post surgery

Collaborators and Investigators

• Sponsor: University of California, Irvine
• Investigators: Principal Investigator: Thomas Ahlering, MD, University of California, Irvine

Study record dates

Study Major Dates

• Study Start: August 1, 2009
• Primary Completion (Actual): June 1, 2015
• Study Completion (Actual): June 1, 2015

Study Registration Dates

• First Submitted: June 3, 2009
• First Submitted That Met QC Criteria: June 3, 2009
• First Posted (Estimate): June 5, 2009

Study Record Updates

• Last Update Posted (Actual): March 27, 2019
• Last Update Submitted That Met QC Criteria: March 6, 2019
• Last Verified: March 1, 2019

More Information

Terms related to this study

• Keywords: Hypothermia; Potency; Robotic prostatectomy
• Additional Relevant MeSH Terms: Body Temperature Changes; Hypothermia
• Other Study ID Numbers: 2008-6397