Contractility: Cuff Versus Urodynamics Testing In Males With Voiding Lower Urinary Tract Symptoms

The investigators intend to refine the procedural steps of the cuff test to improve the measurement and reduce variability with pves.isv, therefore giving a more reproducible test. By improving the penile cuff test, the investigators can then go on to assess how our non-invasive measurements correlate with urodynamically derived indices of contractility, and use data from this pilot to help construct methodology of future cuff research. The current hypotheses are that; 1) accuracy of the cuff interruption pressure (pcuff.int) can be improved by modification of penile cuff test factors, 2) the number of valid inflations obtained per patient will increase with the modifications, and 3) that this non-invasive measure of contractility will correlate with pre-existing invasive indices. The research protocol also gives the opportunity to explore correlation between commonly used symptom scores, and accuracy in the assessment of ultrasound residual urine volume measurement. The primary objectives are therefore: * To modify procedural steps of the penile cuff test that may reduce the previously observed variability and perform a pilot study to assess a reduction in variance * To identify behaviour of the urethra during penile cuff inflation, by performing x-ray screening during the penile cuff test, and assess whether this is another source of inaccuracy * To test the basic assumption of the penile cuff test that the bladder neck remains open during flow interruption Secondary objectives of the study include the following: * To compare non-invasive measurements from the penile cuff test against invasive indices of contractility * To compare 2 different symptom scores for men with voiding lower urinary tract symptoms (LUTS) * To assess accuracy and inter-observer variability of ultrasound residual measurement against a known volume.