Urinary Obstruction
Case Studies
The 57-year-old patient noted urinary hesitancy and a decrease in the force of his urinary
stream for several months. Both had progressively become worse. His physical examination
was essentially negative except for an enlarged prostate, which was bulky and soft.
Studies Results
Routine laboratory studies Within normal limits (WNL)
Intravenous pyelogram (IVP) Mild indentation of the interior aspect of the bladder,
indicating an enlarged prostate
Uroflowmetry with total voided
flow of 225 mL
8 mL/sec (normal: >12 mL/sec)
Cystometry Resting bladder pressure: 35 cm H2O (normal: <40 cm H2O)
Peak bladder pressure: 50 cm H2O (normal: 40-90 cm H2O)
Electromyography of the pelvic
sphincter muscle
Normal resting bladder with a positive tonus limb
Cystoscopy Benign prostatic hypertrophy (BPH)
Prostatic acid phosphatase
(PAP)
0.5 units/L (normal: 0.11-0.60 units/L)
Prostate specific antigen (PSA) 1.0 ng/mL (normal: <4 ng/mL)
Prostate ultrasound Diffusely enlarged prostate; no localized tumor
Diagnostic Analysis
Because of the patient’s symptoms, bladder outlet obstruction was highly suspected. Physical
examination indicated an enlarged prostate. IVP studies corroborated that finding. The
reduced urine flow rate indicated an obstruction distal to the urinary bladder. Because the
patient was found to have a normal total voided volume, one could not say that the reduced
flow rate was the result of an inadequately distended bladder. Rather, the bladder was
appropriately distended, yet the flow rate was decreased. This indicated outlet obstruction.
The cystogram indicated that the bladder was capable of mounting an effective pressure and
was not an atonic bladder compatible with neurologic disease. The tonus limb again
indicated the bladder was able to contract. The peak bladder pressure of 50 cm H2O was
normal, again indicating appropriate muscular function of the bladder. Based on these
studies, the patient was diagnosed with a urinary outlet obstruction. The PAP and PSA
indicated benign prostatic hypertrophy (BPH). The ultrasound supported that diagnosis.
Cystoscopy documented that finding, and the patient was appropriately treated by
transurethral resection of the prostate (TURP). This patient did well postoperatively and had
no major problems.
Critical Thinking Questions
1. Does BPH predispose this patient to cancer? 2. Why are patients with BPH at increased risk for urinary tract infections? 3. What would you expect the patient’s PSA level to be after surgery? 4. What is the recommended screening guidelines and treatment for BPH? 5. What are some alternative treatments / natural homeopathic options for treatment?
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