Patent ID: 6263241
Filing Date: 2001-07-17
Classification: A61N

Abstract:
An implantable cardiac stimulator/defibrillator comprisinga hermetically sealed case;at least one lead having an electrode thereon, said electrode being electrically connected to said stimulator/defibrillator;an indifferent electrode electrically connected to said stimulator/defibrillator;a power source in said case;a control circuit connected to said power source;a sensing circuit capable of sensing the electrical condition of the heart of a patient;a hemodynamic sensor capable of sensing a parameter correlated to the state of blood flow;a correlation circuit associated with said control circuit capable of correlating a presence of electrical rhythm in the heart with an absence of a selected level of said parameter after an episode of tachyarrythmia; andan output circuit responsive to said correlation and control circuits, said output circuit producing an electrical therapy between said electrode and said indifferent electrode, said therapy comprised of a series of packets of electrical pulses,said pulses being from about 20 microseconds in length and having a frequency of from 20 Hz to about 500 Hz and an amplitude of from about 20 V to about 80 V andsaid packets being comprised of from 1 to 40 pulses and leading pulses in adjacent packets being separated from each other by intervals of from about 0.1 seconds to about 2 seconds, andsaid series lasting at least 2 seconds.