In vitro effects of lidocaine on the contractility of equine jejunal smooth muscle challenged by ischaemia-reperfusion injury.
Authors: Guschlbauer M, Hoppe S, Geburek F, Feige K, Huber K
Journal: Equine veterinary journal
Summary
# Editorial Summary: Lidocaine's Protective Effects on Ischaemia-Repreperfusion-Injured Equine Intestinal Smooth Muscle Post-operative ileus represents a significant complication following colic surgery in horses, and whilst lidocaine is commonly administered as a prokinetic agent, the precise cellular mechanisms underlying its beneficial effects on intestinal smooth muscle remain poorly understood. Guschlbauer and colleagues used an in vitro model to measure isometric force generation in equine jejunal smooth muscle tissue, comparing normal samples with those subjected to ischaemia-reperfusion injury (mimicking strangulation colic), whilst simultaneously assessing membrane integrity through creatine kinase release as a marker of cellular damage. Lidocaine demonstrated a three-phase dose-dependent response, with initial recovery of contractility—notably more pronounced in injured tissue—followed by a plateau phase during which contractile function remained stable across a broad concentration range; importantly, the drug also reduced creatine kinase release, suggesting cellular protective effects beyond simple stimulation. These findings indicate that lidocaine may facilitate recovery of smooth muscle function after ischaemic injury through cellular repair mechanisms, potentially explaining its clinical efficacy in managing post-operative ileus when intestinal tissue viability has been compromised. Further characterisation of these protective cellular pathways could refine therapeutic protocols for horses with POI and guide selection of adjunctive treatments to support return of normal intestinal motility.
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Practical Takeaways
- •Lidocaine's prokinetic benefits in POI may work through direct cellular repair of ischaemia-damaged smooth muscle rather than simple stimulation
- •The drug shows particular efficacy on compromised muscle tissue (post-ischaemia) rather than healthy tissue, suggesting targeted benefit in post-colic cases
- •Understanding lidocaine's mechanism could lead to improved dosing protocols and better outcomes for horses recovering from colic surgery
Key Findings
- •Lidocaine stimulated contractility of ischaemia-reperfusion injured smooth muscle more pronouncedly than noninjured smooth muscle
- •Dose-dependent response showed initial recovery of contractility followed by plateau phase across broad concentration range
- •Lidocaine decreased creatine kinase (CK) release, indicating improved cell membrane integrity and basic cellular function
- •Lidocaine effects suggest cellular repair mechanisms improve smooth muscle function after ischaemic injury