| http://www.w3.org/ns/prov#value | - In one embodiment, the implanted pressure sensing system also includes a pacemaker or defibrillator. [0164] According to one aspect of the current invention, calibration is periodically checked at any suitable time or location, such as during visits to the physician's office by having the patient perform Valsalva maneuvers by exhaling into a pre-calibrated apparatus 23 containing a second transduc
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