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1 Data Sciences International, St. Paul, Minnesota 55126; 2 IBIS Instrumentation Canada, Ottawa, Ontario, Canada K1Z 7Z3; 3 Mayo Clinic, Rochester, Minnesota 55905; and 4 Department of Pharmacochemistry, Division of Molecular Pharmacology, Leiden/Amsterdam Center for Drug Research, Free University, 1081 HV Amsterdam, The Netherlands
A
simple and reliable means for accurate, chronic measurement of
pulsatile blood pressure (BP) from conscious, freely moving laboratory
mice was developed and validated. The newly developed device consists
of a small (1.9 ml, 3.4 g), fully implantable radiotelemetry
transmitter. Initial frequency response tests showed an adequate
dynamic response; the average
3-dB point found in five
transmitters was 145 ± 14 (SD) Hz. BP, heart rate, and locomotor activity were recorded from 16 chronically (30-150 days) implanted mice. Mean arterial and pulse pressure, checked at regular intervals, ranged from 90-140 mmHg and from 30-50 mmHg, respectively,
throughout the study. Transmitter BP measurements were validated
against a Millar 1.4-Fr. transducer-tipped catheter. The mean error of the transmitters for diastolic pressures was +1.1 ± 6.9 mmHg
(n = 7). The error for systolic pressures was, on average, 2.7 ± 3.9 mmHg larger. This new device accurately monitors BP, heart rate, and locomotor activity in conscious, untethered, freely moving
mice living in their home cages for periods of at least 150 days.
conscious animals; chronic implant; frequency response; biocompatibility
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