Impact of Forced Diuresis on the Residual Fragment Rate After Flexible Ureteroscopy for Destruction of Kidney Stones With Laser

Inclusion Criteria: * Patients ≥ 18 years old and \< 80 years old * With the need to perform a flexible ureteroscopy with destruction of the kidney stones with laser * Participants covered by or entitled to social security * Written informed consent obtained from the participant * Ability for participant to comply with the requirements of the study Exclusion Criteria: * Persons covered by articles L1121-5 to L1121-8 of the CSP (corresponding to all protected persons: pregnant women, parturients, nursing mothers, persons deprived of their liberty by judicial or administrative decision, minors, and persons subject to a legal protection measure: guardianship or trusteeship) * Contra-indication to Furosemide: * Hyper-sensitivity to the active substance or one of the excipients * Hyper-sensitivity to Sulfonamide * Renal failure with oligo-anuria refractory to Furosemide * Hypokalemia \< 3,5 mmol/L * Severe hyponatremia * Hypovolemia with or without hypotension or dehydration * Ongoing hepatitis, hepatic insufficiency severe and hepatic encephalopathy * Patient having Furosemide as usual treatment * Patient requiring an injection of Aminoside or Vancomycin before or during the procedure * Participation in other interventional research with an investigational drug or medical device