The present invention relates to implantable medical devices and methods, and more particularly to {HEAD ~ an implantable antitachycardia device}, e.g., {TAIL ~ an antitachycardia pacemaker} or defibrillator cardioverter, that automatically adjusts its detection rate threshold as a function of the sensed cardiac rate 
The present invention relates to implantable medical devices and methods , and more particularly to { HEAD ~ an implantable antitachycardia device } , e.g. , { TAIL ~ an antitachycardia pacemaker } or defibrillator cardioverter , that automatically adjusts its detection rate threshold as a function of the sensed cardiac rate
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