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Intramuscular Injection of Sevoflurane Detects Malignant Hyperthermia Predisposition in Susceptible Pigs |
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| Authors: | Schuster Frank MD; Metterlein Thomas MD; Negele Sabrina MS&#x;; Gardill Annegret MS&#x;; Schwemmer Ulrich MD&#x;; Roewer Norbert MD ; Anetseder Martin MD&#x; |
| Institution: | Schuster, Frank M.D.*; Metterlein, Thomas M.D.*; Negele, Sabrina M.S.?; Gardill, Annegret M.S.?; Schwemmer, Ulrich M.D.?; Roewer, Norbert M.D.§; Anetseder, Martin M.D.? |
| Abstract: | Background: The authors hypothesized that intramuscular sevoflurane injection allows diagnostic differentiation between malignant hyperthermia-susceptible (MHS) and -nonsusceptible (MHN) pigs by measurement of intramuscular lactate and carbon dioxide partial pressure (Pco2), and that dantrolene reduces the sevoflurane-induced Pco2 increase. Methods: With approval of the local animal care committee, microdialysis probes with attached microtubing for sevoflurane injection were placed in the adductor muscles of nine MHS and six MHN pigs, and Pco2 probes with microtubing were positioned in the triceps muscle of eight MHS and six MHN pigs. After equilibration, sevoflurane boluses at different concentrations and a sevoflurane-dantrolene bolus were injected synchronously. Lactate, pyruvate, and glucose as well as Pco2 were measured spectrophotometrically, and the rate of Pco2 increase was calculated. Results: Intramuscular sevoflurane injection increased local lactate and Pco2 dose dependently, and significantly higher in MHS than in MHN pigs. Measurement of the rate of Pco2 increase allowed a distinct differentiation between single MHS and MHN pigs. No significant increase in Pco2 was found with sevoflurane and dantrolene. |
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