Bases anatômicas para o bloqueio do nervo pudendo em gatos (Felis catus Linnaeus, 1758) - estudo cadavérico.

Abstract

Studies have shown that blocking the pudendal nerve confers analgesia to the perineum and urethra for performing both outpatient and surgical procedures. For this, however, anatomical knowledge is fundamental but the anatomic information available about it is not homogeneous and lacks data. Due to its clinical importance, the objective of the present research was to analyze the anatomic aspects of the pudendal nerve topography and describe and assess the practicality of two techniques to access the pudendal nerve in domestic feline cadavers. A total of 17 cadavers was used in the anatomic study and 27 and 16 corpses were used, respectively, to describe the two access techniques to the pudendal nerve, that were distributed in different phases in the anatomic study. It was observed that the pudendal nerve originated in the first and second ventral sacral nerves and that it presented an immediate lateral caudal curve to the periformis muscle and was directly related with the ischial spine. The description of the first technique showed that the pudendal nerve could be accessed by introducing, for 27 mm, a needle immediately dorsal to the sciatic tuberosity and parallel to the transversal plane. The description of the second technique showed that the pudendal nerve could be accessed by introducing a needle, for 22 mm, between the cranial and midpoint of an imaginary ilioischemic straight line, the needle forming a 48° angle with the straight line and a 26° angle with the sagittal plane. The assessment of the practicality of the first technique revealed that the stain was deposited dorsally to the ischial spine and that the pudendal nerve was stained bilaterally in 67% of the cadavers. In the assessment of the second technique it was observed that there was bilateral marking of the pudendal nerve, or of its first sequence, in 100% of the cadavers. These results increase anatomical knowledge on the pudendal nerve and demonstrate the practicality of its access.