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Twenty-five adult individuals were allocated into two groups: HG (dexmedetomidine 0.1\u00a0mg\/kg\u2009+\u2009ketamine 10\u00a0mg\/kg;\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200913) and LG (dexmedetomidine 0.05\u00a0mg\/kg\u2009+\u2009ketamine 10\u00a0mg\/kg;\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200912). Heart rate, respiratory rate, and cloacal temperature, along with motor and behavioral reflexes and venous blood gas analysis, were evaluated at baseline, during chemical restraint, and throughout recovery. No significant differences were observed between groups at the same time points for heart rate, respiratory rate, or cloacal temperature, indicating physiological stability at both dosages. In the HG group, respiratory rate progressively decreased from baseline (39\u2009\u00b1\u200913 [12\u201364]) to 7\u2009\u00b1\u200912 [0\u201342] between 35 and 45\u00a0min after drug administration, with recovery to 36\u2009\u00b1\u200910 [17\u201356] fifteen minutes following atipamezole administration. Reflex assessment demonstrated deeper sedation in the HG group, with significant differences in head tone, limb tone, righting reflex, and palpebral reflex, whereas cloacal reflex and jaw tone did not differ between doses. Pharmacological reversal restored physiological parameters to near-baseline values within 25\u00a0min. Venous blood gas analysis revealed mild and transient changes in pH and pCO\u2082 in both groups, without clinically relevant consequences. In conclusion, dexmedetomidine at doses of 0.1\u00a0mg\/kg and 0.05\u00a0mg\/kg, combined with ketamine (10\u00a0mg\/kg) and administered at an ambient temperature of 28\u00a0\u00b0C, is safe for\n                    <jats:italic>P. geoffroanus<\/jats:italic>\n                    . The higher dose was associated with deeper sedation, making it suitable for field procedures and clinical handling.\n                  <\/jats:p>","DOI":"10.1007\/s11259-026-11461-4","type":"journal-article","created":{"date-parts":[[2026,8,21]],"date-time":"2026-08-21T04:01:18Z","timestamp":1787284878000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Physiological and sedative responses in Phrynops geoffroanus (Schweigger, 1812): Comparison of two anesthetic protocols using dexmedetomidine and ketamine"],"prefix":"10.1007","volume":"50","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-9864-5280","authenticated-orcid":false,"given":"Ademar Francisco Fagundes","family":"Meznerovvicz","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-1905-9233","authenticated-orcid":false,"given":"Ana Let\u00edcia Rodrigues","family":"Marques","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9916-6435","authenticated-orcid":false,"given":"Marina","family":"Marangoni","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0468-8637","authenticated-orcid":false,"given":"Ana Paula Gomes","family":"Lustosa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7029-6631","authenticated-orcid":false,"given":"Rafael Martins","family":"Valad\u00e3o","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5519-061X","authenticated-orcid":false,"given":"Paulo Henrique","family":"Braz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,21]]},"reference":[{"key":"11461_CR1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1093\/conphys\/coy041","volume":"6","author":"L Adamovicz","year":"2018","unstructured":"Adamovicz L, Leister K, Byrd J, Phillips CA, Allender MC (2018) Venous blood gas in free-living eastern box turtles (Terrapene carolina carolina) and effects of physiologic, demographic and environmental factors. 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