Question 1

What endourological procedures are used to remove bladder stones?

Accepted Answer

Small bladder stones are removed using cystolitholapaxy via cystoscopy. For larger stones, transurethral or percutaneous suprapubic cystolitholapaxy is performed, where ultrasonic, laser, or electrohydraulic energy breaks up the stones, which are then flushed out through bladder irrigation. This minimally invasive approach avoids open surgery.

Question 2

How does percutaneous nephrolithotomy treat large renal stones?

Accepted Answer

Percutaneous nephrolithotomy involves making a small incision in the patient's back and inserting a nephroscope through a sheath into the kidney. Under fluoroscopic or ultrasound guidance, ultrasonic, laser, or electrohydraulic energy fragments the stones, and debris is irrigated out of the kidney. This technique handles larger stones effectively.

Question 3

What is the difference between laser lithotripsy and extracorporeal shock wave lithotripsy?

Accepted Answer

Laser lithotripsy uses a holmium laser directed through a ureteroscope to fragment ureteral or bladder stones, with fragments removed or flushed out. Extracorporeal shock wave lithotripsy uses focused shock waves to break kidney or upper ureter stones smaller than 2 cm, allowing fragments to pass naturally through urine.

Question 4

When is open surgical intervention necessary for urinary tract stones?

Accepted Answer

Open surgical procedures such as nephrolithotomy, pyelolithotomy, ureterolithotomy, or cystotomy may be necessary in severe cases depending on stone size and location. Surgery is indicated when stones cause severe pain, infection, obstruction, or when minimally invasive options are unsuitable for patient management.

Question 5

How is ureteroscopy used to treat ureteral and renal pelvis stones?

Accepted Answer

A flexible or rigid ureteroscope is inserted to access stones in the ureter or renal pelvis. Ureteroscopy is combined with ultrasonic, laser, or electrohydraulic lithotripsy to fragment stones before removal, offering a minimally invasive treatment option for patients with upper urinary tract calculi.

Question 6

What criteria determine when surgical intervention is needed for kidney stones?

Accepted Answer

Medical intervention is necessary when stones exceed 5 millimeters and cannot pass spontaneously, when accompanied by symptomatic infection like fever or pyelonephritis, when they impair kidney function, or cause persistent severe pain, nausea, or urinary retention. Patients with one kidney also require intervention.

Question 7

What size limitations apply to extracorporeal shock wave lithotripsy treatment?

Accepted Answer

Extracorporeal shock wave lithotripsy is preferred for kidney or upper ureter stones smaller than 2 centimeters. Shock waves generated by a lithotripter are focused on the stone using fluoroscopy or ultrasound guidance, breaking it into fragments that pass naturally through urine without surgical incision.

Nierensteine VI: Chirurgisches Management

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