Anatomy and Physiology. Nerve Supply to Prostate.

Anatomy and Physiology

Nerve Supply to Prostate

Prostate Nerve Supply

• Nerve supply received from neurovascular bundles

• Innervated by autonomic and sensory nerves

• Originates from the pelvic and hypogastric fibers

• Nerves coalesce at tips of seminal vesicles to form the pelvic plexus

Importance of Nerve Supply

• Neurovascular bundles responsible for erectile function

• Consideration for comfort control during PROSTIVA® RF Therapy procedure

Prostate Blood Supply

• Two main arteries supply the prostate– Positioned at 11 and

1 o’clock

• Reduced blood supply will impede growth of prostate

Clinical Implications for Benign Prostatic Hyperplasia (BPH) Therapy

• Stroma (fibromuscular) predominant BPH– Responds to -adrenergic blockers which

exert their effect on the muscle

• Epithelial (glandular) predominant BPH– Responds to androgen suppression therapy

such as 5- reductase inhibitors, which inhibits the conversion of testosterone to DHT

Issa M, Contemporary Diag and Mgmt, 2005.

-Adrenergic Receptor Distribution in the Lower Urinary Tract

-1D adrenoreceptors -1A adrenoreceptors

Prostate Zones

Transitional Zone

• Located anteriorly but surrounds the urethra

• BPH primarily affects the transitional zonePercentage of the prostate– Peripheral zone - 70% – Central zone - 25%

– Transitional zone - 5%

Benign Prostatic Hyperplasia (BPH) Overview

Symptomatic BPH Population

US Prevalence: 14.9 Million

US Incidence: 500,000

Translates to: 50% of men over 50

60% of men over 60

70% of men over 70

80% of men over 80

US Census; Millennium Research, 2006; A.G. Edwards & Son, 2006.

Why Treat BPH?

• BPH is not cancer but it can lead to unwanted complications if not corrected

• Urine retention and strain on the bladder can lead to– Urinary tract infections– Bladder or kidney damage– Bladder stones– Incontinence

• When BPH is diagnosed and treated early, there is a lower risk of developing such complications

Quality of Life of Untreated BPH

Before PROSTIVA® RF Therapy• I couldn’t play golf because if I’d get out there I had to stop and find a bathroom to go.

--Harold

• I just had to go an awful lot – five or six times a night. --Paul

• I didn’t really mind so much the fact that it was difficult to start urination, but what I really did mind was having the leakage. --Bill

• It has an impact because first of all when you go into a strange store or a strange building, the first thing you have to zero in on is where are the restrooms. --Richard

• I carried a cup in the car so I could urinate. I’ve urinated to relieve myself going 60 miles an hour! --Moses

After PROSTIVA RF Therapy

• The RF Therapy has changed my life. It has allowed me to do things that I couldn’t do without conditions before. --Richard

• Prior to the RF Therapy, I was on two expensive medications for prostate problems and one of them I had to take twice a day. And after the Therapy, I’ve been able to drop them and don’t have to take them anymore which is great. --Bobby

• PROSTIVA RF Therapy is the best thing I ever did in my life. --Harold

Click box to activate video

This video clip is one patient’s experience only and may not reflect other patients' experiences

Benign Prostatic Hyperplasia (BPH)

Patient Evaluation and Diagnosis

BPH Diagnosis and Treatment Algorithm

AUA Guideline 2003/updated 2006.

Initial Evaluation• History• DRE & Focused PE• Urinalysis• PSA

Surgery

AUA/IPSS Symptom Index Assessment of Patient Bother

Moderate/Severe Symptoms (AUA/IPSS 8)

Optional Diagnostic Tests• Uroflow• PVR

Discussion of Treatment Options

Mild Symptoms(AUA/IPSS 7) or No Bothersome Symptoms

Presence of • Refractory retention or any of the

following clearly related to BPH•Persistent gross hematuria•Bladder stones•Recurrent UTIs•Renal insufficiency

Patient Chooses Noninvasive Therapy

Patient Chooses Invasive Therapy

Watchful Waiting Medical TherapyMinimally Invasive Therapies Surgery

Optional Diagnostic Tests• Pressure flow• Urethrocystoscopy• Prostate ultrasound

Further Evaluation Warranted?

• Abnormal DRE

• Abnormal PSA

• Prior therapy for LUTS/BPH

• Non-response to medical therapy

• <50 years of age

• History of diabetes

• History of pelvic surgery/ trauma

• Neurologic symptoms/ disease

• Renal insufficiency


Questions to Ask Relative to History

• Oral intake– Timing

– Caffeine

– Alcohol

• Medications affecting volume– Diuretics

– Stool-bulking agents

• Medications affecting voiding– Antihistamines

– Decongestants

• Diseases– Diabetes

– Congestive heart failure

– Neurologic


Optional Diagnostic Tests

Following initial evaluation• Uroflow

– Urinary flow-rate recording (Qmax)

• PVR

If patient chooses invasive therapy• Pressure flow• Urethrocystoscopy• Prostate ultrasound


Standard Questionnaires for Patient’s Perception of BPH Symptoms

• AUA Symptom Score • International Prostate Symptom Score (IPSS)• BPH Impact Index (Bother Score)

AUA Symptom Score Index

• Seven-item questionnaire related to BPH symptoms

• Validated and reproducible• Determines disease severity• Documents response to therapy• Allows standardized comparisons of symptom

relief when evaluating treatments


AUA Symptom Score


Classification of AUA Symptom Scores

The possible total runs from 0-35 points with higher scores indicating more severe symptoms. Scores lower than 7 are considered mild and generally do not warrant treatment.

Classification ranges• Mild (0-7)• Moderate (8-19)• Severe (20-35)• Without bother or bothersome


Initial Management and Discussion Using AUA Symptom Score

Patients with mild symptoms (AUA symptom score ≤ 7)

and

Patients with moderate or severe symptoms (AUA

symptom score ≥ 8) who are not bothered by their symptoms

– Offer watchful waiting– Reassure patient– Reassess periodically

Initial Management and Discussion Using AUA Symptom Score

Patients with bothersome, moderate to severe symptoms (AUA Symptom Score ≥ 8)

– Watchful waiting– Discuss BPH treatment options, including benefits

and risks– Provide patient education materials

International Prostate Symptom Score (IPSS)

AUA Symptom Score Index plus additional question on QOL as a function of urinary symptoms:

“If you were to spend the rest of your life with your urinary condition just the way it is now, how would you feel about that?”

– Scale of 0 to 6 (delighted to terrible)– Note: While symptoms may be prevalent, they may not be

troublesome

O’Leary MP. Urology. 2000.

1. Over the past month, how much physical discomfort did any urinary problems cause you?

None of A little of Some of Most of All of the time the time the time the time the time

4. Over the past month, how much of the timehas any urinary problem kept you from doing the kinds of things you would usually do?

2. Over the past month, how much did you worry about your health because of any urinary problems?

3. Overall, how bothersome has any troublewith urination been during the past month?

BPH Impact Index (Bother Score)

None Only a little Some A lot

Not at all Bothers Bothers Bothersbothersome me a little me some me a lot


Mechanism of Action

Definitions

• Current - the number or amount of electrons flowing past a fixed point for a fixed amount of time

• Current density - the amount of current flowing per unit area of a conductor surface

• Electricity - the flow of atoms through various mediums such as fluids or metals that are called conductors. There are negatively charged particles inside the atoms called electrons. The electrons will move through a conductor if force or pressure is applied.

Definitions - continued

• Hyperthermia therapy - prostate tissue is heated to the range of 42 to 44 C. Tissue effect is temporary.

• Resistance/impedance - resistance encountered by the electrons as they move through a conductor. Resistance/ impedance is measured in ohms.

• Voltage - the force or pressure that moves electrons through a conductor.

Current Density

Basic Function

• The PROSTIVA® RF Therapy system generator produces the voltage (force) necessary to move the electrons through the prostate tissue to the grounding pad.

• Electrons moving through the tissue vibrate the tissue causing heat from friction.– Temperature/time

• 45 C – 60 Minutes• 55 C – 20 Minutes• 60 C – 5 Minutes• 70 C – 2 Minutes

Boschef, et al. ASME, 2001.

Impact of Heat on Tissue

The heat generated in the tissue by the needles can be described as forming two zones.

Pathological lesion• Produced when temperatures reach > 55° C• Described as coagulative necrosis (dead tissue surrounded by

healthy tissue)

Physiological lesion• Occurs at temperatures > 47° C• Surrounds the pathological lesion and is described as the

gelatinized zone• Tissue is not killed, but damaged• Result is injury to the tissue that is accompanied with inflammation

and edema, resembling a gelBoschef, et al. ASME, 2001.

Physiological Lesion

Pathological Lesion

RF energy disperses quickly and predictably in tissue. The energy creates heat through “cellular friction.” The heat created measures 115° C for PROSTIVA® RF Therapy at the center of the lesion (pathological lesion). The temperature of the heat drops between 5° to 15° C every 2 mm away from the needles (physiological lesion).

Delivery of RF Energy Through Needles

Medtronic internal data on file.

Science Behind the Technology

• Based on reasonable scientific analysis, PROSTIVA® RF Therapy works in the following ways:– Denervation– Devascularization

Denervation

• Alpha-receptors have the highest concentration at and around the bladder neck; alpha-blocker medications target this area.

• PROSTIVA® RF Therapy is the only therapy that delivers lethal, controlled doses of 115° C temperatures precisely to this area while protecting the bladder neck’s functionality.– The system’s right angle delivery of the predetermined needle

length and the known centimeter spheroid lesion size ensures this.

• The destruction of these alpha-receptor nerve fibers has been shown histologically. PROSTIVA RF Therapy Model 8930 System User Guide; 4-3.

Perchino M. Eur Urol 1993.

Alpha Receptors in the Prostate

Devascularization

• Two main arteries which supply the prostate come in at 11 and 1 o’clock positions.

• The growth and proliferation of the abnormal cells requires blood flow in order to progress.

• The interference of the blood supply will impede the abnormal cellular activities within the transitional zone of the prostate.

• This can be influenced by creating lesions or scar tissue by delivering RF energy to this exact area.

Prostate Blood Supply

PROSTIVA® RF Therapy Procedureand Its Impact on Size

• Recall that 5- reductase inhibitors block free testosterone from binding to 5- reductase

• PROSTIVA RF Therapy may kill:– 5- reductase that is in the lesion– The blood vessels that carry the free testosterone to

the transitional zone

• PROSTIVA RF Therapy could decrease the size of the prostate

Mechanism of Action Animation

Click to play movie

MRI Movie Sequence

Used by permission - Thayne Larson, M.D.

Click to play movie

MRI Lateral Lobe Lesions Coronal View


MRI Lateral Lobe Lesions Horizontal View


MRI Median Lobe LesionsCoronal View


MRI Median Lobe Lesions Horizontal View


Treatment Options for Benign Prostatic Hyperplasia (BPH)

How do you balance the challenges of providing a good in-office experience versus long-term symptom relief for your patients?

What’s Your BPH Treatment Algorithm?

Treating BPH

• Minor symptoms usually do not require treatment.

• Moderate to severe symptoms tend to interfere with sleep and daily activities and usually require treatment.

Three Categories of Treatment Options

Drug Therapy Office Procedure Surgical

-blocker

5- reductase inhibitor

Combination

Radio Frequency

High energy TUMT

Low energy TUMT

ILC

TURP

TUIP

PVP

HoLAP

Drug Therapy

Advantages• No surgery• Effective for mild to moderate symptoms

Disadvantages• Lifelong commitment to therapy• Effectiveness may decrease over time• Drug therapy can cause multiple side effects

– Impotence, dizziness, headaches, fatigue, and decreased libido

• Must take a daily pill for the rest of your life to maintain symptom relief and costs approximately $1,000 per year

http://www.drugstore.com, 2006.

Surgical – Transurethral Resection of the Prostate (TURP)

Advantages• Availability of long-term

outcomes data• Good clinical results• Treats prostates <150 g• Low retreatment rate• Low mortality

Disadvantages• Requires two to four days

hospitalization

• Requires general or spinal anesthesia

• Potential surgical risks include:– Impotence– Retrograde ejaculation– Incontinence– Infection– Excessive blood loss

Borth CS et al, Urology, 2001.Mebust WK et al, J Urol, 1989.

Wagner JR et al, Semin Surg Oncol, 2000.

Surgical - GreenLight PVP™

• Hospital-based procedure • Requires general anesthesia• Better for smaller prostates• TURP-like results

Surgical - HoLAP

• Holmium laser ablation of the prostate (HoLAP)

• Performed as an outpatient procedure • Tissue ablation is roughly equivalent to

GreenLight PVP™• Versatility of performing across multiple

specialties and treating other urology conditions including strictures, tumors and stones

Office Procedures

• Avoid the need to take daily medication

• Avoid some of the risks and complications associated with surgery

Office Procedures

• Radio Frequency Therapy (PROSTIVA®)

• Microwave Thermotherapy (TUMT)

• Interstitial Laser Coagulation (ILC)

Office Procedure - TUMT

• Microwaves used to heat and destroy excess prostate tissue

• Procedure takes about one hour

• Some require 2 to 14 days of catheterization which can result in urinary tract infection

Office Procedure - ILC

• Laser energy coagulates obstructing tissue of the enlarged prostate gland

• The tissue that is destroyed is absorbed by the body and BPH symptoms decrease over time

• May require extended post-procedural catheterization which can result in higher rates of urinary tract infection

• Procedure takes less than one hour

• Requires 5 to 14 days of catheterization

PROSTIVA® RF TherapyIndication for Use

PROSTIVA® Radio Frequency Therapy is indicated for the treatment of symptoms due to urinary outflow obstruction secondary to benign prostatic hyperplasia (BPH) in men over the age of 50 with prostate sizes between 20 and 50 cm3.

PROSTIVA® RF Therapy System User Guide.

• Delivers low-level radio frequency energy into the middle of the prostate and relieves obstruction without causing damage to the urethra

• Can be performed with a sedative and local anesthetic in a urologist’s office

• Procedure takes less than one hour• Catheterization, if required, is 0-2

days on average• Intended for men over age 50

PROSTIVA® RF Therapy

Temperature Chart

Prolieve, Prostatron, Thermatrx, Targis, Indigo Instructions for Use.PROSTIVA RF Therapy System User Guide.

What Side Effects are Associated with PROSTIVA® RF Therapy?

• Possible side effects include:– Obstruction– Catheterization (for urinary retention)– Bleeding/blood in urine– Pain/discomfort– Urgency to urinate– Increased frequency of urination– Urinary tract infection– Patients may also experience a minor burning sensation when

urinating for one to two weeks following the treatment

• Compared to traditional surgical treatments, fewer side effects and adverse events


PROSTIVA® RF Therapy Overview

Proven RF Technology

• Nearly 100,000 patients treated worldwide

• Five-year efficacy data– After five years:

• IPSS - 55%• Qmax +29%• QOL +68%

• 115º C core lesion temperature

• 89 published articles on RF therapy for BPH

Hill, et al, J Urol, 2004.

Precise Therapy Delivery

• 360 degrees of precision to treat exactly the area you want

• Six different needle length options to treat varying prostate sizes and shapes

• 15 computer-monitored safety checks

Evolution of RF Therapy

1992

TUNA 35.5 - 7 min

Lesion (manual)

• Catheter – 22F

• 26 gauge needles

• Manual power, impedance and temperaturecontrols

• Physiciandependent

1995 - 1997

• First automaticsystem models7205 & 7600

• 18.5F/26 gaugeneedles

• Temperature measured byshield thermocouples

1997

• 18.5F delivery system

• Highest quality opticswith proximal anddistal positioning

• 6 preset needle lengths

• Automatic shielddeployment

• Urethral thermocouple

• Reusable handle w/disposable cartridge

2000

• Target temperatureof 110° C

• Hollow tip needles

• Thermocouples inshields and bothneedle tips

• Shield length = 6mm

• Designed for office

2003

• Lesion time25% faster than Precision

• Larger needle (24 gauge)provides forconsistent heating in alltypes of tissue

ProVu5.5 – 7 min

lesion

Precision4 min lesion

Precision Plus3 min lesion

ProVuDelivery System

2006

PROSTIVA2 min 20 sec lesion

• New RF generator

• Lesion time22% faster than Precision Plus

• Target temp of 115 ° C

• Integrated disposable hand piece


• Designed by Medtronic

• Target lesion temperature of 115°C

• 2 min 20 second per lesion

• Easy set-up

• User interface with touch screen controls

• Platform of the future


System Components

Generator Features

Computer Monitored Safety Checks:

• Monitors urethral and prostatic temperatures six times per second

• Controls RF power 5000 times per second

• Measures impedance and power 50 million times per second

• Computerized graphics allow physician to view treatment in real time

• Single sterile use • Tubing system connects to hand piece• Tubing connects to an irrigation source

which supplies cooling fluid during procedure

Hand Piece Features

Telescope Features

• Reusable, but must be cleaned and sterilized before each procedure

• Allows physician to directly view anatomical landmarks and the needle deployment site

• Both 0º and 15º telescopic angles available

Patient Selection and Assessment

Patient Selection

Examples of prostate shapes that PROSTIVA® RF Therapy can treat

20-50 grams Long Lobes Median Lobe*Asymmetric Gland

Short Lobes

*Excluding a ball valve median lobe that grows up into bladder and obstructs opening

Contraindications

• Patients with active urinary tract infection

• Neurogenic, decompensated, or atonic bladder

• Urethral strictures or muscle spasms that prevent insertion of the hand piece sheath

• Bleeding disorders or patients taking anticoagulation medications unless antiplatelet medication has been discontinued for at least 10 days

• ASA class group V patients

• Clinical or histological evidence of prostatic cancer or bladder cancer

• Prostate gland <34 mm or >80 mm in transverse diameter

• Presence of any prosthetic device in the region that may interfere with the procedure

• Patients whose prostate has been previously treated with non-pharmacological therapies

• Presence of a cardiac pacemaker, implantable defibrillator, or malleable penile implants

• Patients with any component(s) of an implantable neurostimulation system


Procedure Basic Steps

PROSTIVA® RF Therapy Procedure

• Prepare patient

• Administer comfort control

• Measure prostate

• Determine number of treatment planes

• Treat median lobe if necessary

• Create lesions

Comfort Control Protocol

• Describe your comfort control protocol

• See Medtronic PROSTIVA® RF Therapy procedural video for several comfort control options, which can be used during the PROSTIVA RF procedure. Medical practice is solely the responsibility of the individual physician and not Medtronic.

Treatment Approach

• Guidelines for determining the number of treatment planes are based on the distance from the bladder to the verumontanum

– Ideally, a minimum of two planes should be treated, provided that the distance from the needle placement to the bladder neck and from the needle placement to the veru remains 0.75-1.0 cm

• A treatment plane consists of delivery of energy to the right and left lobes at the same level

Determination of the number of treatment planes is the clinician’s sole medical judgment.


Determining Number of Treatment Planes

Recommended guidelines


Median Lobe Treatment

• Visualize size and structure

• Needles should be deployed 1 cm away from the proximal margin of the bladder neck

• Select needle length of 12 or 14 is recommended

Determination of median lobe treatment locations and appropriate needle length is the clinician’s sole medical judgment.


Median Lobe Treatment Locations

Recommendedtreatment locations

• Proximal (upper) end– 10, 12, and 2 o’clock

• Distal (lower) end– 6 o’clock location is for

therapy at distal end


PROSTIVA® RF Therapy Procedure

Prostate During Procedure

Prostate Post-Procedure

MRI Image Post-Procedure

Click on picture to show MRI image

Reimbursement

Reimbursement Status

• PROSTIVA® RF Therapy coverage:– Medicare in all 50 states– Many private pay and managed care insurance

companies

• Most patients will be responsible for a deductible and/or co-payment

• Medicare reimburses physicians for performing the PROSTIVA RF Therapy procedure in their offices (there is a site of service differential)

Clinical

Outcomes

• Would you perform the PROSTIVA® RF Therapy procedure on your father?

• Why do you think PROSTIVA RF Therapy works?

PROSTIVA® RF Therapy Long-term Durability

Can you speak to long-term durability?

• Hill B, Belville W, Bruskewitz R, Issa M, Perez-Marrero R, Roehrborn C, Terris M, Naslund M, “Transurethral Needle Ablation versus Transurethral Resection of the Prostate for the Treatment of Symptomatic Benign Prostatic Hyperplasia: 5-Year Results of a Prospective, Randomized, Multicenter Clinical Trial,” J Urol, 2004;171:2336-2340

• Zlotta, AR, Giannakopoulos X, Maehlum O, Ostrem T, Schulman CC, “Long-Term Evaluation of Transurethral Needle Ablation of the Prostate (TUNA) for Treatment of Symptomatic Benign Prostatic Hyperplasia: Clinical Outcome Up To Five Years From Three Centers,” Eur Urol, 2003; 44:89-93

• Boyle P, Robertson C, Vaughan E D, Fitzpatrick J, “A Meta-Analysis of Trials of Transurethral Needle Ablation for Treating Symptomatic Benign Prostatic Hyperplasia”, British Journal of Urology Intl, 2004; 94: 83-88.

• AUA Guidelines 2004, “Management of Benign Prostatic Hyperplasia: Diagnosis and Treatment Recommendations” Chapter 1, page 27.

References

• Issa M, Marshall F. Contemporary Diagnosis and Management of Diseases of the Prostate. 3rd ed. Newtown, Pa: Handbooks in Healthcare Co; 2005.

• American Urological Association Education and Research, Inc. AUA Guideline 2003/Updated 2006.

• O’Leary MP. LUTS, ED, QOL: alphabet soup or real concerns to aging men? Urology, 2000;56(suppl 5A):7-11.

• Boschef, et al., “In vitro assessment of the efficacy of thermal therapy in human benign prostate hyperplasia,” ASME, 2001 Nov; 2001.

• PROSTIVA RF Therapy Model 8930 System User Guide, 4-3.• Perchino M, et al., “Does transurethral thermotherapy induce a long-term alpha blockade?

An immunohistochemical study,” Eur Urol, 1993, 23:299-301.• Larson, Thayne. Institute of Medical Research and Lance Mynderse, M.D., Mayo Clinic.

“MRI study of 12 patients with average age of 64, treatment focus on bladder neck and lateral lobe,” 2006 Medtronic RF Therapy Study.

• http://www.drugstore.com. Accessed March 7, 2006.• PROSTIVA® RF Therapy System User Guide. Safety information from System User Guide

is available at www.prostiva.com.

References

• Hill B, Belville W, Bruskewitz R, Issa M, Perez-Marrero R, Roehrborn C, Terris M, Naslund M, “Transurethral Needle Ablation versus Transurethral Resection of the Prostate for the Treatment of Symptomatic Benign Prostatic Hyperplasia: 5-Year Results of a Prospective, Randomized, Multicenter Clinical Trial,” J Urol, 2004;171:2336-2340.

• Nickel JC, “Long-term implications of medical therapy on benign prostatic hyperplasia end points,” Urology, 1998;51(suppl 4A):50-57.

• Borth CS, Beiko DT, Nickel JC, “Impact of medical therapy on transurethral resection of the prostate: a decade of change,” Urology, 001;57:1082-1086.

• Mebust WK, Holtgrewe HL, Cockett ATK, Peters PC, for the Writing Committee. “Transurethral prostatectomy: immediate and postoperative complications. A cooperative study of 13 participating institutions evaluating 3,885 patients,” J Urol, 1989;141:243-247.

• Wagner JR, Russo P, “Urologic complications of major pelvic surgery,” Semin Surg Oncol, 2000;18:216-228.

For more information about PROSTIVA® RF Therapy, call (800) 643-9099, x6000; or visit www.prostiva.com

CAUTION: Federal law (USA) restricts this device to sale by or on the order of a physician.

Anatomy and Physiology. Nerve Supply to Prostate.

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