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71,72 This is likely to be due to an age-associated decrease in bladder contractility and increase in collagen. With BPH, the cycle of urine storage and voiding causes repeated bladder distension, raised intravesical pressure, ischemia, and reperfusion, eventually resulting in various changes in the urothelium, nerves, and smooth muscle. Impaired vesical blood flow results in oxidative stress, with free radicals causing damage to the urothelium, nerves, and smooth muscle.73 Patients with persistent DO following transurethral resection of the prostate (TURP) have ongoing impairment of perfusion of the lower urinary tract,74 suggesting a correlation between impaired perfusion and storage dysfunction. 1 Changes in nerves: the nerves in the bladder http://www.selleckchem.com/products/rxdx-106-cep-40783.html wall (pelvic nerve post-ganglionic fibers) are particularly vulnerable to ischemia and undergo partial denervation. With this denervation, the bladder smooth muscle becomes supersensitive to acetylcholine (ACh).75 Furthermore, in sensory nerves subjected to ischemia, the number of neurokinin receptors increases,76 resulting in increased sensory sensitivity. It is not uncommon for middle-aged to elderly men with LUTS to have BPE but not BPO.62 In particular, voiding symptoms in elderly men are caused by bladder contractile dysfunction rather than obstruction.70�C72 https://en.wikipedia.org/wiki/Crotamiton Anesthesia of the prostatic urethra has been reported to increase bladder volume,87 suggesting that urethral sensory nerves are responsible for storage symptoms. The http://www.selleckchem.com/products/CP-673451.html incidence of acute urinary retention is significantly higher in patients with BPH who have a prostatic volume ��31?mL or serum PSA levels ��1.6?ng/mL. These patients are more likely to progress to invasive treatment.45 The risk of acute urinary retention increases with age and it is often associated with DU.70 Macroscopic hematuria is present in 12% of patients in whom surgery is indicated for BPH.88 A possible cause of the macroscopic hematuria is increased microvessel density due to the increased expression of vascular endothelial growth factor associated with the enlargement of the prostate.89,90 Bladder calculi associated with BPH are thought to be caused by urinary stasis,91 although the underlying mechanism is unclear. Increased PVR volumes and endoscopic manipulation in the lower urinary tract are thought to contribute to UTI. Although renal failure is a rare complication of BPH (