Related Experiment Video
Updated: Jun 5, 2025
Author Spotlight: Advancing Stroke Research with Periorbital Doppler Monitoring of Regional Cerebral Blood Flow in Rodent Models
Published on: November 22, 2024
Periorbital Placement of a Laser Doppler Probe for Cerebral Blood Flow Monitoring Prior to Middle Cerebral Artery
Denali C Dickson1, Mitchell J Bartlet2, Sharon Hom1
1College of Nursing, University of Arizona.
Abstract:
Middle cerebral artery occlusion (MCAO) is the gold-standard method for preclinical modeling of ischemic stroke in rodents. However, successful occlusion is not guaranteed by even the most skilled surgical hands. Errors primarily occur when the filament is not placed at the correct depth and include instances of either no infarction or vessel perforation, which can cause death. Laser Doppler flowmetry (LDF) is a reliable technique that provides real-time feedback on regional cerebral blood flow (CBF) during the MCAO procedure. Here we demonstrate a rapid technique for periorbital placement of a laser Doppler probe for measurement of CBF in both mice and rats. Our rationale was to simplify LDF implementation, encouraging widespread usage for improved surgical reliability. The technique eliminates the need for skull thinning and specialized equipment, with placement at the periorbital region rather than dorsal placement, promoting efficiency and ease of adoption. The protocol described here encompasses presurgical preparations, periorbital Doppler probe placement, and post-operative care. Representative results include visual depictions of procedural elements along with representative LDF tracings illustrating successful MCAO surgeries, with instances of unsuccessful filament placement leading to complications. The protocol illustrates LDF in confirming proper filament placement and offers a simplified procedure compared to alternative methods.
Insights
This study introduces a simplified periorbital laser Doppler flowmetry technique to improve the reliability of middle cerebral artery occlusion (MCAO) rodent models for ischemic stroke research. The method enhances surgical success rates by providing real-time cerebral blood flow feedback.
Area of Science:
- Neuroscience
- Surgical Techniques
- Cerebrovascular Research
Background:
- Middle cerebral artery occlusion (MCAO) is a critical preclinical model for ischemic stroke.
- Surgical errors in MCAO, such as incorrect filament depth, can lead to failed infarction or fatal vessel perforation.
- Real-time monitoring of regional cerebral blood flow (CBF) is crucial for ensuring successful MCAO.
Purpose of the Study:
- To present a simplified and rapid technique for periorbital placement of a laser Doppler flowmetry (LDF) probe.
- To enhance the reliability and success rate of the MCAO procedure in rodent models.
- To encourage wider adoption of LDF for improved surgical outcomes in stroke research.
Main Methods:
- Developed a novel periorbital placement technique for LDF probes in mice and rats.
- Eliminated the need for skull thinning and specialized equipment, simplifying probe placement.
- Detailed presurgical preparations, periorbital probe placement, and post-operative care protocols.
Main Results:
- Demonstrated successful real-time measurement of CBF using the simplified periorbital LDF technique.
- Provided visual evidence of procedural steps and representative LDF tracings.
- Illustrated the utility of LDF in confirming correct filament placement and identifying procedural complications.
Conclusions:
- The periorbital LDF technique offers a simplified and efficient method for monitoring CBF during MCAO.
- This approach improves surgical reliability and reduces the incidence of procedural errors in rodent stroke models.
- Widespread adoption of this technique can lead to more consistent and reproducible preclinical stroke research.
