Impact of ureteroscopy in the modified Valdivia position for management of upper urinary tract stone disease; A comparison of mono- and dual access

Impact of ureteroscopy in the modified Valdivia position for management of upper urinary tract stone disease; A comparison of mono- and dual access - Impact of ureteroscopy in the modified Valdivia position

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000008962

Enrollment

Registered

2012-09-23

Start date

2012-09-21

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

upper urinary tract stone (stone size &gt

Interventions

ureteroscopy in the modified Valdivia position ureteroscopy and add PCNL in the modified Valdivia position only if judged necessary intraoperatively

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: upper urinary tract stone (stone size > 15mm) patients who were scheduled for ureteroscopy and add PCNL in the modified Valdivia position only if judged necessary intraoperatively in our hospital

Exclusion criteria

Exclusion criteria: 1. refractory anti-coagulant therapy 2. refractory immunosuppressant therapy 3. refractory diabetes mellitus 4. refractory urinary tract infection 5. anesthsiological unfavorable conditions including circulatory, respiratory, and hepatorenal disease 6. complete staghorn calculi

Design outcomes

Primary

Measure	Time frame
safety and effectiveness to perform ureteroscopy along with PCNL while maintaining the modified Valdivia position.	—

Countries

Japan

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026