Frequency response of implantable blood pressure telemetry systems
1. Measurement of blood pressure via telemetry in a variety of animal species has become an indispensable part of cardiovascular physiology, drug development and safety pharmacology. 2. These telemetry systems use fluid-filled catheters, which differ from comm…
Cyclic intermittent hypoxia enhances renal sympathetic response to ICV ET-1 in conscious rats
To test the hypothesis that central changes in sympathoregulation might contribute to sympathoexcitation after cyclic intermittent hypoxia (CIH) we exposed male Sprague-Dawley rats to CIH or to room air sham (Sham) for 8h/d for 3 weeks. After completion of the…
Sympathetic response to chemostimulation in conscious rats exposed to chronic intermittent hypoxia
Exposure to cyclic intermittent hypoxia (CIH) is associated with elevated arterial pressure and sustained sympathoexcitation, but the causes of the augmented sympathetic activity remain poorly understood. We recorded arterial pressure, heart rate, and renal sy…
Novel technology for the provision of power to implantable physiological devices
We report the development of a novel technology that enables the wireless transmission of sufficient amounts of power to implantable physiological devices. The system involves a primary unit generating the magnetic field and a secondary pickup unit deriving po…
Powering implantable telemetry devices from localized magnetic fields
This paper presents a novel method of inductively powering an implantable telemetry device over a large area. The system is based around an array of individually tuned series resonant circuits distributed across a charging pad. By varying the frequency of the…
Exogenous and endogenous angiotensin-II decrease renal cortical oxygen tension in conscious rats by limiting renal blood flow
KEY POINTS: Our understanding of the mechanisms underlying the role of hypoxia in the initiation and progression of renal disease remains rudimentary. We have developed a method that allows wireless measurement of renal tissue oxygen tension in unrestrained ra…
DOI: 10.1113/JP270731