How GreenLight Photovaporization Treats an Enlarged Prostate

GreenLight treats an enlarged prostate by turning the overgrown tissue that squeezes the urine channel into vapor. The laser travels up through the penis, so there is no outside cut. The result is a wider channel, much like the standard operation creates, but reached by burning tissue away rather than cutting it out.¹ Because the beam seals blood vessels as it works, the procedure trades a little extra operating time for less bleeding and a quicker trip home.²

What the Green Laser Does Inside the Prostate

An enlarged prostate, which your records may call BPH (benign prostatic hyperplasia), is a noncancerous growth and a common cause of a blocked bladder outlet and urinary symptoms.³ The prostate wraps around the urethra like a doughnut around its hole, so growth in the inner tissue presses inward on the channel that carries urine out of the bladder. The bladder then has to push harder against the narrowing, which is why the stream weakens, starts slowly, or dribbles at the end.

Size is not the whole story. Tense muscle in the prostate and stiffened tissue can narrow the channel even in a smaller gland.⁴ So symptoms don’t always match how big your prostate is, and surgery aims to open the channel itself. Medication is usually tried first, and the laser is generally considered when pills no longer control symptoms or cause side effects you dislike.

GreenLight emits green light at 532 nanometers, which is soaked up mainly by the red pigment in blood.⁵ Blood-rich prostate tissue heats so quickly that its cells turn to vapor.⁶ The light reaches less than 2 mm deep, so the surgeon removes tissue layer by layer with precision.⁷ The overgrown tissue is surrounded by a capsule with few blood vessels, so the laser works much less on that outer shell.⁸ By lowering power to about 30 watts the surgeon can seal bleeding spots, and by raising it to 80–180 watts, vaporize.⁹

In the operating room, you are given anesthesia, usually general or spinal, though sedation or a nerve block are options. A thin scope carrying the laser fiber goes up the urethra. The surgeon sweeps the beam across the tissue, which bubbles away as vapor. A catheter is usually placed at the end to drain urine while swelling settles. The newer 180-watt system removes tissue faster than older models, and some outcome data come from older versions, so ask your surgeon which one they use.

How Well It Works Compared With Standard Surgery

TURP, the standard operation that scrapes out prostate tissue with an electric loop, has long been the benchmark. In a two-year trial, GreenLight and TURP lowered the symptom score by about 16 and 15 points, and both raised peak urine flow by about 13–15 ml per second.¹⁰

The symptom score, often written IPSS on your forms, runs from 0 to 35, with higher meaning worse symptoms. It comes from a short questionnaire about things like weak stream, straining, waking at night to urinate, and urgency, each rated by how often it bothers you. Roughly, 0 to 7 counts as mild, 8 to 19 as moderate, and 20 to 35 as severe, so a drop of 15 points can move a man from severe to mild. You will likely fill out the same form before surgery and again afterward, so you and your surgeon can compare real numbers.

Peak flow measures how hard your stream is at its strongest. A gain of about 14 ml per second usually means a noticeably stronger stream. Your urologist may measure it before and after surgery by having you urinate into a special funnel.

In pooled results, TURP came out slightly ahead on symptom score at two years, by under half a point.¹¹ That gap is far too small for most men to notice. Peak urine flow at two years was no different between the two operations.¹²

One trial did fail to prove GreenLight equal. Median symptom scores at a year were 6 after GreenLight versus 5 after TURP, and the study couldn’t rule out a small disadvantage. Both groups still ended with mild symptoms.

Recovery Time and the Catheter

The operation takes about 10 minutes longer than TURP on average, but men keep the catheter about 1.3 days less and leave hospital about 2 days sooner.¹³ In one trial the median stay was 1 day after GreenLight versus 2.5 after TURP.¹⁴ In one Canadian program, 130 of 140 GreenLight patients went home the same day, while every TURP patient was admitted.¹⁵

A catheter is a thin flexible tube that runs through the penis into the bladder and drains urine into a bag. After GreenLight it is often removed within a day, sometimes before you leave the hospital, though some men go home with it and return to have it taken out. The urine in the bag may look pink at first, and that is expected as the area heals. After removal, a short wait to confirm you can pass urine on your own is typical before going home.

Once home, burning when urinating and urgency are common for a few weeks as the raw area heals. Blood in the urine can come and go, especially as scabs fall off. Drinking plenty of water and avoiding heavy lifting or straining helps. Call your doctor for heavy clots, fever, or inability to urinate. A urinary tract infection is a separate possibility: fever, chills, or burning that worsens rather than eases may point toward it. A urine test can tell infection apart from normal healing, and an infection is treated with antibiotics.

Anesthesia can be adjusted for frailer men. Deep sedation instead of general anesthesia has been used successfully, including in men with serious health problems.¹⁶ A nerve block around the prostate let 46 of 52 men feel no pain during surgery and no one needed general anesthesia.¹⁷ For men with small but bothersome prostates, the procedure has been done safely in a doctor’s office.¹⁸ If you have heart or lung problems, ask whether a lighter anesthetic is an option.

Bleeding and Taking Blood Thinners

Compared with TURP, GreenLight cut the risk of a blood clot blocking the bladder by almost 90%.¹⁹ The need for a blood transfusion fell by about three quarters.²⁰

Blood from the prostate can clot inside the bladder and block the outlet, so urine cannot drain and the bladder becomes painfully full. A clot usually calls for flushing the bladder through a catheter, and sometimes a return to the operating room.

Blood thinners slow clotting, so a raw prostate surface that would ordinarily stop bleeding quickly may keep oozing. Stopping them carries its own risk, since they are often prescribed to prevent strokes or clots in men with heart rhythm problems or stents. The choice is a balance between bleeding risk and clotting risk.

In one group of 233 men, about 4% had bleeding during surgery, with no difference between those on blood thinners and those not.²¹ In another study, men who kept taking blood thinners had no measurable drop in blood count and no bleeding problems over 12 weeks.²² Men who continued anticoagulants did have more serious complications in one study, though none needed a transfusion.²³

Never stop or continue a blood thinner on your own. Your surgeon and the doctor who prescribed it should decide together. Useful questions to bring:

Should I keep taking it, pause it, or switch to a short-acting injection?
If stopping, how many days before surgery?
What signs of bleeding at home mean I should call?
How does my reason for taking it, such as a heart stent or atrial fibrillation, change the answer?

Effects on Ejaculation and Erections

After surgery, semen usually flows backward into the bladder at orgasm instead of out the penis.²⁴ The sensation of climax usually remains, but little or no fluid comes out. Some men notice the climax feels a little less intense, while others notice no difference. The cause is that the surgery widens the area at the bladder opening that normally closes tight during ejaculation. It is not harmful and does not cause pain or damage to the bladder. The semen leaves harmlessly with urine, which may look cloudy.²⁵ Most men become unable to father children naturally, so men who want children should discuss this beforehand.²⁶

Erections are a different matter. In a two-year trial, erection scores did not change after GreenLight.²⁷ In another two-year study, erection scores fell on average, mostly in men who had the best erections beforehand.²⁸ Overall, sexual problems were about a third less common than after TURP.²⁹ Erection trouble that existed before surgery is unlikely to improve from it.

Other Complications to Know About

In one 10-year series, about 6% of men had temporary painful urination after surgery.³⁰ About 2.5% developed scarring at the bladder neck and about 2% a narrowing of the urethra.³¹ In a large study, about 1 in 5 men had a complication, nearly all minor and treatable.³² Apart from bleeding and sexual effects, other complications happened about as often as with TURP.³³

Scar narrowing usually shows up months later as a weakening stream, and it can feel like the original symptoms returning. It is typically fixed with a short procedure to open the scar. Report a slowing stream rather than assuming it’s normal aging.

If Your Prostate Is Very Large

Symptom relief, flow, and quality of life after GreenLight are similar in large and small prostates.³⁴ Larger glands do need more operating time and laser energy.³⁵ Longer operations mean more time under anesthesia, which matters for men with heart or lung problems.

In men with prostates over 100 ml, operations took about 90 minutes yet most still went home within 24 hours.³⁶ Those men stayed improved at 4 years.³⁷ Retreatment may be more likely in big glands if too little energy is used.³⁸

Glands over 80 to 100 ml are generally considered very large, though cutoffs vary by surgeon. Your urologist will likely measure yours before surgery to plan the operation.

Surgeon experience matters here. Surgeons need over 100 GreenLight cases to reach consistent performance, and experience affects how thoroughly tissue is removed. Asking how many large prostates your surgeon has treated with this laser is reasonable and common.

How Long Results Last and How It Compares With HoLEP

After about five years, roughly 3–5% of men needed another prostate procedure.³⁹ With the 180-watt laser the reoperation rate was about 5% at nearly five years.⁴⁰ Reoperation risk was similar to TURP.⁴¹

Sometimes the second treatment is a short scar-opening procedure, not another full operation. The percentages in studies count every kind of retreatment together, so they do not tell you which kind you might need.

HoLEP, holmium laser enucleation, cuts out the overgrown tissue whole rather than vaporizing it. Compared with older 80- and 120-watt GreenLight, HoLEP gave larger improvements and fewer repeat operations at five years.⁴² The 180-watt GreenLight looks comparable to HoLEP at five years, though data are limited.⁴³ In men with small prostates, GreenLight and HoLEP gave similar results.⁴⁴

The best choice among GreenLight, TURP and HoLEP often depends on prostate size and your surgeon’s skill with each. HoLEP may suit very large glands where available. Vaporizing the prostate leaves no tissue sample to check for cancer, unlike TURP or HoLEP, so ask whether cancer testing is needed beforehand.

Cost also differs. In Canada GreenLight cost about $3,900 versus $4,900 for TURP with similar quality of life. The savings come mostly from shorter hospital stays. Your own cost depends on your insurance and whether you stay overnight.