Hi Sarah,
Thanks for the fab questions! So we do have information about complication rates for both surgical and endoscopic biopsies as well as for bile aspirate. I have summarised the papers below and also given you the references in case you wanted to read around the subjects too.
In the following paper looking at surgical biopsies, of 172 cats, two (1·2%) had definite dehiscence, and four (2·3%) had possible dehiscence.
Ref:
Swinbourne F, Jeffery N, Tivers MS, Artingstall R, Bird F, Charlesworth T, Doran I, Freeman A, Hall J, Hattersley R, Henken J, Hughes J, de la Puerta B, Rutherford L, Ryan T, Williams H, Woods S, Nicholson I. The incidence of surgical site dehiscence following full-thickness gastrointestinal biopsy in dogs and cats and associated risk factors. J Small Anim Pract. 2017 Sep;58(9):495-503. doi: 10.1111/jsap.12696. Epub 2017 Aug 1. PMID: 28762502.
Gastrointestinal perforation occurred in 1.6% of cats and 0.1% of dogs that underwent endoscopy during the 17 yr study period
Ref:
Irom S, Sherding R, Johnson S, Stromberg P. Gastrointestinal perforation associated with endoscopy in cats and dogs. J Am Anim Hosp Assoc. 2014 Sep-Oct;50(5):322-9. doi: 10.5326/JAAHA-MS-5727. PMID: 25028434.
Clinical complications directly associated with cholecystocentesis were identified in 4 dogs (8%) and 1 cat (1%).
Ref:
Peters LM, Glanemann B, Garden OA, Szladovits B. Cytological Findings of 140 Bile Samples from Dogs and Cats and Associated Clinical Pathological Data. J Vet Intern Med. 2016 Jan-Feb;30(1):123-31. doi: 10.1111/jvim.13645. Epub 2015 Nov 14. PMID: 26566964; PMCID: PMC4913648.
