In vivo assessment of myocardial blood flow in rat heart using magnetic resonance imaging: effect of anesthesia
Résumé
PURPOSE: To assess the influence of isoflurane and pentobarbital anesthesia and the carrier gases on myocardial blood flow (MBF) in the rat heart in vivo. MATERIALS AND METHODS: MBF was quantified in vivo using arterial spin-labeling (ASL) magnetic resonance imaging (MRI). Left ventricular (LV) function was estimated during the same experiment using cine-MRI. Thirty-four male Wistar-Kyoto rats were divided in four groups, one anesthetized with isoflurane in oxygen:nitrous oxide mix (ISO), the three others with intraperitoneal pentobarbital, and breathing either room air (PB), oxygen:nitrous oxide (PB + N(2)O), or oxygen:nitrogen (PB + N(2)). RESULTS: MBF was significantly higher in the ISO and PB + N(2)O groups vs. PB and in ISO vs. PB + N(2), with the following respective MBF values: ISO, 5.9 +/- 1.1; PB, 4.0 +/- 0.8; PB + N(2)O, 5.1 +/- 1.4; and PB + N(2), 4.6 +/- 0.8 mL/g/minute, mean +/- SD. Ejection fractions were reduced by 10% in PB and PB + N(2)O rats vs. ISO rats. Cardiac output (CO) and index (CI) were 25 to 30% lower in all rats anesthetized with pentobarbital than with isoflurane. CONCLUSION: Isoflurane and nitrous oxide induce a higher MBF than pentobarbital. Isoflurane also induces a higher ejection fraction in healthy rats.
Mots clés
MRI
Stroke Volume
Disease Models
Animal
Pentobarbital
Rats
Anesthesia
Inhalation
Myocardium
Magnetic Resonance Angiography
Nitrous Oxide
Coronary Circulation/*drug effects
Wistar
Isoflurane
Inhalation/methods
Hemodynamics/physiology
Nitrous Oxide/pharmacology
Anesthetics
Inhalation/*pharmacology
Female
myocardial blood flow
Pentobarbital/pharmacology
Coronary Circulation
Animals
Stroke Volume/*drug effects/physiology
*Magnetic Resonance Angiography
Hemodynamics
rat
Sensitivity and Specificity
Male
Isoflurane/pharmacology
Myocardium/metabolism/pathology
Magnetic Resonance Imaging
Cine