Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1994-07-25
1995-04-04
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 1368
Patent
active
054033551
ABSTRACT:
An implantable medical interventional device for delivering electrical therapies to the heart of an implant patient to treat pathologic ventricular tachycardia. The device includes a first sensor for developing a signal indicative of the patient's ventricular ECG status, and a second sensor for developing a signal indicative of the patient's atrial ECG status. Criteria are established to distinguish physiologic tachycardia and pathologic tachycardia in the ventricles by an evaluation of the signal indicative of ventricular ECG status, and an appropriate is therapy is delivered if the evaluation indicates a pathologic tachycardia in progress. The therapy delivery is limited to an atrial response if the signal developed by the second sensor indicates atrial fibrillation or other atrial dysrhythmia, and is appropriate to that particular dysrhythmia. The evaluation is performed by comparing the signals indicative of atrial and ventricular ECG status to discriminate primary ventricular tachycardias from secondary ventricular tachycardias of primary atrial origin. The therapy is delivered in a tiered regimen and, in response to the discrimination of primary and secondary ventricular tachycardia, is adjusted accordingly. The tiered therapy regimen may include a therapy of solely atrial defibrillation. A non-ECG sensor may additionally be used to sense a physiological parameter indicative of patient activity. In that case, in response to detection of ventricular tachycardia by the first sensor, detection of atrial tachycardia by the second sensor, and indication of patient resting condition or low level activity by the non-ECG sensor, a ventricular tachycardia is treated as pathologic atrial tachycardia, and atrail therapy is applied without any therapy to the ventricle.
REFERENCES:
patent: 4998974 (1991-03-01), Aker
patent: 5014698 (1991-05-01), Cohen
Intermedics Inc.
Kamm William E.
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