Fig. 1. A young male patient (aged 36 years) presenting with storage, voiding and postmicturition LUTS. Urodynamic trace of the end of the filling cystometry and the pressure flow study (PFS), illustrating rectal pressure (red), bladder pressure (blue), subtracted detrusor pressure (green), and flow (black). Permission to void was given at 1, and a slowly-building detrusor contraction results, which the patient augments with abdominal straining at 2. Flow took a minute to start, and reached peak flow (Qmax) at point 3. Detrusor pressure was 35 cmH2O and Qmax was 9 mL/s (bladder contractility index 80, which is below the threshold for normal of 100). The detrusor contraction concludes at 4, giving a total duration for the PFS of two and a half minutes.
