Hypertension, Vol 4, 898-903, Copyright © 1982 by American Heart Association
RD Bunag and J Butterfield
A new photoelectric sensor capable of detecting tail pulses even in
unheated rats was tested for accuracy in indirect measurements of blood
pressure. This sensor proved more sensitive than a Doppler ultrasonic
flowmeter because it allowed detection not only of tail pulsations without
preheating but also of peak oscillations usable for estimating mean
arterial pressure. After blood pressures in anesthetized rats were elevated
with norepinephrine or lowered with sodium nitroprusside, systolic
pressures determined with the photoelectric sensor were almost identical
with those recorded concurrently from femoral catheters (r = 0.939). Cuff
pressure at peak oscillations in the tail correlated better with femoral
mean pressure than with femoral diastolic pressure. However, similar
comparisons in awake rats with chronically implanted carotid catheters
showed that, although correlation between tail-cuff and carotid systolic
pressures remained significant (r = 0.962), the correlation between peak
tail oscillations and either mean or diastolic pressure was not. When
systolic pressures were measured indirectly once a week for 7 weeks in
unheated awake rats, normotensive rats could be easily distinguished from
streptozotocin-diabetic and DOCA-salt hypertensive rats.
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Tail-cuff blood pressure measurement without external preheating in awake rats
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