1. Gabrielli F, Cioffi U, Chiarelli M, Guttadauro A, De Simone M. Hemorrhoidectomy with posterior perineal block: experience with 400 cases. Dis Colon Rectum. 2000. 43:809–812.
2. Ho KS, Eu KW, Heah SM, Seow-Choen F, Chan YW. Randomized clinical trial of haemorrhoidectomy under a mixture of local anaesthesia versus general anaesthesia. Br J Surg. 2000. 87:410–413.
3. Luck AJ, Hewett PJ. Ischiorectal fossa block decreases posthemorrhoidectomy pain: randomized, prospective, double-blind clinical trial. Dis Colon Rectum. 2000. 43:142–145.
4. Esser S, Khubchandani I, Rakhmanine M. Stapled hemorrhoidectomy with local anesthesia can be performed safely and cost-efficiently. Dis Colon Rectum. 2004. 47:1164–1169.
5. Nystrom PO, Derwinger K, Gerjy R. Local perianal block for anal surgery. Tech Coloproctol. 2004. 8:23–26.
6. Ong CH, Chee Boon, Keng V. Ambulatory circular stapled haemorrhoidectomy under local anaesthesia versus circular stapled haemorrhoidectomy under regional anaesthesia. ANZ J Surg. 2005. 75:184–186.
7. Delikoukos S, Zacharoulis D, Hatzitheofilou C. Local posterior perianal block for proctologic surgery. Int Surg. 2006. 91:348–351.
8. Vinson-Bonnet B, Coltat JC, Fingerhut A, Bonnet F. Local infiltration with ropivacaine improves immediate postoperative pain control after hemorrhoidal surgery. Dis Colon Rectum. 2002. 45:104–108.
9. Gerjy R, Lindhoff-Larson A, Sjodahl R, Nystrom PO. Randomized clinical trial of stapled haemorrhoidopexy performed under local perianal block versus general anaesthesia. Br J Surg. 2008. 95:1344–1351.
10. Gerjy R, Derwinger K, Nystrom PO. Perianal local block for stapled anopexy. Dis Colon Rectum. 2006. 49:1914–1921.
11. Nivatvongs S. An improved technique of local anesthesia for anorectal surgery. Dis Colon Rectum. 1982. 25:259–260.
12. Read TE, Henry SE, Hovis RM, Fleshman JW, Birnbaum EH, Caushaj PF, et al. Prospective evaluation of anesthetic technique for anorectal surgery. Dis Colon Rectum. 2002. 45:1553–1558. discussion 8-60.
13. Sun MY, Canete JJ, Friel JC, McDade J, Singla S, Paterson CA, et al. Combination propofol/ketamine is a safe and efficient anesthetic approach to anorectal surgery. Dis Colon Rectum. 2006. 49:1059–1065.
14. Wahlgren CF, Quiding H. Depth of cutaneous analgesia after application of a eutectic mixture of the local anesthetics lidocaine and prilocaine (EMLA cream). J Am Acad Dermatol. 2000. 42:584–588.
15. Arndt KA, Burton C, Noe JM. Minimizing the pain of local anesthesia. Plast Reconstr Surg. 1983. 72:676–679.
16. Scarfone RJ, Jasani M, Gracely EJ. Pain of local anesthetics: rate of administration and buffering. Ann Emerg Med. 1998. 31:36–40.