|
|
| Line 21: |
Line 21: |
|
| |
|
|
| |
|
|
| |
| ===Surgery===
| |
| If medical treatment fails, [[transurethral resection of prostate]] (TURP) surgery may need to be performed. This involves removing (part of) the prostate through the [[urethra]]. There are also a number of new methods for reducing the size of an enlarged prostate, some of which have not been around long enough to fully establish their safety or side effects. These include various methods to destroy or remove part of the excess tissue while trying to avoid damaging what's left. Transurethral electrovaporization of the prostate (TVP), laser TURP, visual laser ablation (VLAP), TransUrethral Microwave ThermoTherapy (TUMT), [[Transurethral needle ablation of the prostate|TransUrethral Needle Ablation]] (TUNA), ethanol injection, and others are studied as alternatives.
| |
|
| |
| Newer techniques involving lasers in urology have emerged in the last 5-10 years. Starting with the VLAP technique involving the [[Nd:YAG laser]] with contact on the prostatic tissue. A similar technology called Photoselective Vaporization of the Prostate (PVP) with the GreenLight (KTP) laser have emerged very recently. This procedure involves a high powered 80 Watt KTP laser with a 550 micrometre laser fiber inserted into the prostate. This fiber has an internal reflection with a 70 degree deflecting angle. It is used to vaporize the tissue to the prostatic capsule. KTP lasers target haemoglobin as the chromophore and have typically have a penetration depth of 2.0mm (four times deeper than holmium).
| |
|
| |
| Another procedure termed Holmium Laser Ablation of the Prostate (HoLAP) has also been gaining acceptance around the world. Like KTP the delivery device for HoLAP procedures is a 550um disposable side-firing fiber that directs the beam from a high powered 100 Watt laser at a 70degree from the fiber axis. The holmium wavelength is 2,140nm, which falls within the infrared portion of the spectrum and is invisible to the naked eye. Where KTP relies on haemoglobin as a chromophore, water within the target tissue is the chromophore for Holmium lasers. The pentration depth of Holmium lasers is <0.5mm avoiding complications associated with tissue necrosis often found with the deeper penetration and lower peak powers of KTP.
| |
|
| |
| Both wavelengths, KTP and Holmium, ablate approximately one to two grams of tissue per minute.
| |
|
| |
|
| ==Related chapters== | | ==Related chapters== |