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