Key result
Midazolam sedation preserves murine cardiac function better than isoflurane, closely mirroring awake echocardiography without stress.
Why the study?
Isoflurane anesthesia can suppress cardiac function during murine echocardiography, whereas awake imaging avoids pharmacological interference but can induce sympathetic activation.
Does midazolam sedation provide a better alternative to isoflurane anesthesia or awake imaging for assessing cardiac function during murine echocardiography?
Does midazolam sedation provide a better alternative to isoflurane anesthesia or awake imaging for assessing cardiac function during murine echocardiography?
Midazolam sedation is a feasible alternative to isoflurane for murine echocardiography, avoiding the cardiac suppression of isoflurane and the stress-induced sympathetic activation of awake imaging.
Answers are grounded in this paper and cite their sources.
May support midazolam sedation for stress-free murine echocardiography; leaves open validation against isoflurane and awake protocols.
Isoflurane anesthesia is often used to facilitate murine echocardiography, but can suppress cardiac function. Awake imaging avoids pharmacological interference, but can induce sympathetic activation. In this Midazolam sedation. Parameters were compared using repeated-measures ANOVA. Midazolam enabled imaging without overt stress behavior. Compared to midazolam, heart rate was similar under isoflurane and higher while awake (p ≤ 0.01). End-systolic volume was larger under isoflurane and smaller while awake; stroke volumes remained similar across conditions. Global longitudinal and circumferential strain were less negative under isoflurane (p = 0.03) but similar during awake imaging, while radial strain was higher during awake imaging. Peak longitudinal strain rate was less negative under isoflurane (p ≤ 0.01) and more negative while awake (p = 0.05). Early diastolic strain rate was similar under isoflurane and lower while awake (p = 0.02). In conclusion, cardiac function was most depressed under isoflurane and most enhanced during awake imaging, likely stress-driven. Murine echocardiography under midazolam sedation was feasible, yielding better function than isoflurane anesthesia, closer to awake imaging but without overt handling stress. These findings require further validation across disease models, sexes, and strains.
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Jacobs et al. (2025) studied Murine echocardiography. Midazolam sedation vs. Isoflurane anesthesia and awake imaging was evaluated on Cardiac function parameters (heart rate, volumes, and strain). Midazolam sedation for murine echocardiography yielded better cardiac function than isoflurane anesthesia and was closer to awake imaging without overt handling stress.
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