Truett A A, West D B
Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, USA.
Lab Anim Sci. 1995 Jun;45(3):299-302.
A blood pressure telemetry system with catheter placement in the femoral artery was evaluated over a 119-day period in eight mongrel dogs. Every 3 weeks, the pressures recorded by telemetry were compared with direct, simultaneously recorded blood pressures measured from a femoral artery catheter implanted on the contralateral side. One telemetry device failed within 1 week of implant and was replaced before the beginning of data collection. Continuous blood pressure measures were accurate for a minimum of 17 weeks in all eight dogs. Acute changes in blood pressure and heart rate were not evaluated. Validation by simultaneous recording with a physiological monitor indicated that there was no drift in the telemetry blood pressure or heart rate during the 17-week period. Heart rates recorded by telemetry and a physiological monitor were identical, as were mean arterial pressures. The systolic pressure measured by the physiological monitor was consistently higher than that measured by telemetry. This may have been due to differences in the compliance of the catheter material in the two systems. Two devices failed within approximately 6 months of implant, apparently because of exhaustion of the battery. These findings indicate that this telemetry device can be used for periods of up to 17 weeks without appreciable drift or attenuation of the blood pressure signal. The results also describe a validation procedure for monitoring the accuracy of the telemetry system over extended periods of use. We conclude that this telemetry device can be used for the long-term assessment of blood pressure and heart rate in the dog.
在8只杂种犬身上，对一种将导管置于股动脉的血压遥测系统进行了为期119天的评估。每3周，将遥测记录的压力与从对侧植入的股动脉导管同时直接记录的血压进行比较。一个遥测装置在植入后1周内出现故障，并在数据收集开始前进行了更换。在所有8只犬中，连续血压测量至少17周都是准确的。未评估血压和心率的急性变化。通过与生理监测仪同时记录进行验证表明，在17周期间，遥测血压或心率没有漂移。遥测记录的心率与生理监测仪记录的心率相同，平均动脉压也是如此。生理监测仪测量的收缩压始终高于遥测测量的收缩压。这可能是由于两个系统中导管材料顺应性的差异。两个装置在植入后约6个月出现故障，显然是因为电池耗尽。这些发现表明，这种遥测装置可用于长达17周的时间，而不会出现明显的漂移或血压信号衰减。结果还描述了一种在长期使用期间监测遥测系统准确性的验证程序。我们得出结论，这种遥测装置可用于犬血压和心率的长期评估。
