External defibrillator

摘要

An external defibrillator includes patient electrodes (20) for obtaining the patient's electrocardiogram (ECG) and for applying a shock to the patient. A microprocessor (24) analyses the patient's ECG using a diagnostic algorithm to detect if the patient's heart is in a shockable rhythm, and shock delivery circuitry (10) is enabled when a shockable rhythm is detected by the diagnostic algorithm. The patient electrodes also allow obtaining a signal (Z) which is a measure of the patient's transthoracic impedance and the microprocessor is responsive to Z to detect conditions likely to cause the diagnostic algorithm to generate a false detection of a shockable rhythm. If such detection is made, the microprocessor prevents detection of a shockable rhythm by the diagnostic algorithm, at least for a period of time.

主权项

1. An external defibrillator comprising:
electrodes; a processor; and a circuit connecting the processor and the electrodes, wherein when the electrodes are in contact with a patient, the processor performs operations comprising:
receiving electrical signals from the patient;determining, from the electrical signals, a signal (Z), wherein Z is a measure of transthoracic impedance of the patient;establishing an electrocardiogram (ECG) of the patient based on the electrical signals;determining, based on Z, when an interference condition is present andwhen the interference condition is present, inhibiting a shock delivery circuit from delivering a shock to the patient via the electrodes, based on Z, and independent of the ECG, for a defined period of time.