Background: Ureteroscopy under spinal anesthesia is ideal for middle and distal ureteral interventions. However, the patients may experince pain in the proximal ureter. Also in unilateral spinal anesthesia may be pain in enterance of the urethra.
Methods:  Sixty adult patients accepted to attend to the study. The patients in the Group SL (n=30) were positioned with a 45 degree semilateral decubitus position between the operation table and the patient’s back as operative side dependent and in the Group S (n=30) patients were positioned in the supine position after the spinal injections. The patients’ backs were supported with the pre-prepared rolls and they were kept at this position for 10 minutes in the Group SL. Hemodynamic values were recorded. Pain and satisfaction were asked to the patients.
Results: There was no pain at the enterance of the uretra and no surgical complication on operation side during the intraoperative period in all patients due to management of anesthesia. There was a significant decrease in terms of MAP and HR at all times values (except 0.minute values) in Group S (p<0.05). A significant decrease was seen in terms of “two segment regression time” and ambulation time values in Group SL (p<0.05). At the postoperative period, all patients and surgeons were satisfied with the anesthetic technique in the face-to-face interviews in the Group SL.
Conclusion: We would like to define for the blocked areas as modified unilateral spinal anesthesia technique in semilateral positioned patients, also ensured suitable anesthetic conditions for unilateral ureteroscopies.

A new method in spinal anesthesia approach: "semilateral spinal block"