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Direct and indirect methods used to study arterial blood pressure
B N Van Vliet1, L L Chafe, V Antic
1Basic Sciences Division, Faculty of Medicine, Memorial University of Newfoundland, Saint John's, Newfoundland A1B 3V6, Canada. vanvliet@mun.ca
Journal of Pharmacological and Toxicological Methods
|April 28, 2001
Summary
Blood pressure telemetry provides continuous, high-fidelity measurements in conscious animals. Recalibration is crucial for accuracy, and new methods may improve implantation success in mice.
Area of Science:
- Physiology
- Surgical Techniques
- Animal Models
Background:
- Traditional methods for measuring animal blood pressure include indirect tail-cuff and direct catheter methods.
- These methods have limitations such as restraint and anesthesia, which can affect readings.
- Blood pressure telemetry offers a more advanced solution for continuous monitoring.
Purpose of the Study:
- To describe the experience with blood pressure telemetry in rabbits, rats, and mice.
- To highlight the advantages of telemetry over traditional methods.
- To discuss the importance of calibration and potential improvements in implantation techniques.
Main Methods:
- Comparison of traditional indirect (tail-cuff) and direct (catheter) blood pressure measurement techniques.
- Detailed description of blood pressure telemetry implantation and data acquisition in rabbits, rats, and mice.
- Emphasis on the necessity of pre- and post-explantation recalibration of telemetry devices.
Main Results:
- Blood pressure telemetry allows for continuous, high-fidelity recordings in conscious, freely moving animals.
- Recalibration is essential to ensure and document measurement accuracy, with in vivo verification possible for larger animals.
- Telemetry devices are now available for small animals like mice, aiding in transgenic research, though implantation remains challenging.
Conclusions:
- Blood pressure telemetry is a valuable tool for accurate, long-term cardiovascular monitoring in various animal models.
- Consistent recalibration protocols are vital for maintaining data integrity.
- Ongoing development of implantation techniques, particularly for mice, will enhance the accessibility and utility of this technology in biomedical research.