Related Experiment Video
Updated: Oct 5, 2026
Acquisition of Resting-State Functional Magnetic Resonance Imaging Data in the Rat
Published on: August 28, 2021
Cerebral perfusion during anesthesia with fentanyl, isoflurane, or pentobarbital in normal rats studied by arterial
K S Hendrich1, P M Kochanek, J A Melick
1Pittsburgh NMR Center for Biomedical Research, Carnegie Mellon University, Pittsburgh, PA 15260, USA.
Abstract:
The influence of anesthetic agents on cerebral blood flow (CBF) was tested in normal rats. CBF is quantified with arterial spin-labeled MRI in rats anesthetized with either an opiate (fentanyl), a potent inhalation anesthetic agent (isoflurane), or a barbiturate (pentobarbital) using doses commonly employed in experimental paradigms. CBF values were found to be about 2.5-3 times lower in most regions analyzed during anesthesia with either fentanyl (with N(2)O/O(2)) or pentobarbital vs. isoflurane (with N(2)O/O(2)), in agreement with findings utilizing invasive measurement techniques. CBF was heterogeneous in rats anesthetized with isoflurane (with N(2)O/O(2)), but relatively homogeneous in rats anesthetized with either fentanyl (with N(2)O/O(2)) or pentobarbital, also in agreement with studies using other techniques. Magn Reson Med 46:202-206, 2001.
Insights
Anesthetic agents significantly impact cerebral blood flow (CBF) in rats. Arterial spin-labeled MRI revealed CBF is substantially lower with fentanyl or pentobarbital anesthesia compared to isoflurane.
Area of Science:
- Neuroscience
- Radiology
- Anesthesiology
Background:
- Cerebral blood flow (CBF) is a critical physiological parameter.
- Anesthetic agents are widely used in preclinical research, but their effects on CBF can vary.
- Understanding these effects is crucial for interpreting experimental results.
Purpose of the Study:
- To investigate and compare the influence of different anesthetic agents on CBF in rats.
- To quantify CBF using a non-invasive MRI technique under various anesthetic conditions.
Main Methods:
- Utilized arterial spin-labeled (ASL) MRI to measure CBF in normal rats.
- Anesthesia was induced using fentanyl (opiate), isoflurane (inhalation), or pentobarbital (barbiturate).
- Doses were consistent with common experimental paradigms.
Main Results:
- CBF was approximately 2.5-3 times lower in most brain regions under fentanyl or pentobarbital anesthesia compared to isoflurane anesthesia.
- CBF exhibited heterogeneity during isoflurane anesthesia.
- CBF was relatively homogeneous during fentanyl and pentobarbital anesthesia.
Conclusions:
- Anesthetic choice significantly alters CBF in rats, with notable differences between opiate/barbiturate and inhalation anesthetics.
- ASL MRI provides a reliable, non-invasive method for assessing anesthetic-induced changes in CBF.
- Findings align with previous studies using invasive techniques, validating the MRI approach.
