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Related Experiment Video

Updated: Jul 4, 2026

Continuous Blood Sampling in Small Animal Positron Emission Tomography/Computed Tomography Enables the Measurement of the Arterial Input Function
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Sampling of cardiovascular data; how often and how much?

Sarah-Jane Guild1, Carolyn J Barrett, Fiona D McBryde

  • 1Circulatory Control Laboratory, Department of Physiology and Bioengineering Institute, University of Auckland, Private Bag 92019, Auckland, New Zealand. s.guild@auckland.ac.nz

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
|June 6, 2008
PubMed
Summary

Intermittent data sampling can accurately estimate daily cardiovascular means in lab animals. Spreading recordings throughout the day is more effective than total data volume for reliable heart rate, blood pressure, and renal sympathetic nerve activity (RSNA) measurements.

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Continuous Blood Sampling in Small Animal Positron Emission Tomography/Computed Tomography Enables the Measurement of the Arterial Input Function
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Software for Analysis of Heart Rate and Blood Pressure Time-series Data from the Valsalva Maneuver

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Area of Science:

  • Cardiovascular physiology
  • Animal telemetry
  • Biomedical engineering

Background:

  • Long-term telemetry for cardiovascular variables in lab animals is crucial.
  • Limited battery life and data management are significant drawbacks.
  • Intermittent data sampling offers a solution to these limitations.

Purpose of the Study:

  • To determine optimal intermittent sampling protocols for cardiovascular variables.
  • To assess the accuracy of estimating daily means, standard deviation, and interquartile range.
  • To investigate the impact of sampling frequency versus total data volume.

Main Methods:

  • 24-h continuous telemetry recordings of heart rate, arterial pressure, and renal sympathetic nerve activity (RSNA) in rabbits.
  • Resampling data using various protocols varying in sampling periods and total duration.
  • Analysis of absolute percentage errors for estimated daily metrics.
  • Validation using rat arterial pressure data.

Main Results:

  • The number and spacing of sampling periods significantly impacted accuracy more than total data volume.
  • Just 2 hours of total sampling time, spread over 12 periods, yielded <1% error for daily means of blood pressure and heart rate.
  • RSNA daily mean estimation achieved <3% error under the same protocol.
  • Accurate estimates of daily means for arterial pressure, heart rate, and RSNA are achievable with scheduled recording.

Conclusions:

  • Scheduled intermittent data recording is effective for long-term cardiovascular monitoring in laboratory animals.
  • A minimum of 2 hours of data collection per day, distributed across multiple periods, is recommended.
  • This approach overcomes battery life and data management challenges while ensuring data accuracy.