A patient monitoring system includes a heart rate monitor that monitors the physiological parameter from a patient and provides a heart rate indicator based on the physiological parameter, an impedance respiration monitor that measures impedance of the patient's chest and provides a respiration rate, a processor, and an interference detection module. The interference detection module is executable to determine a baseline heart rate while the impedance respiration monitor is not active. The impedance respiration monitor is then activated to measure impedance of the patient's chest to provide the respiration rate. Upon activating the impedance respiration monitor, the interference detection module is executable to assess the heart rate indicator for an interference check period and detect a threshold change in the heart indicator compared to the baseline heart rate during the interference check period. Upon detecting the threshold change, an interference alert is generated to notify a clinician regarding interference with a pacemaker on the patient.

A method for processing and displaying an intracavity electrocardiography signal and a temporary cardiac pacemaker. The method includes acquiring an intracavity electrocardiography signal; pre-processing the intracavity electrocardiography signal; storing the pre-processed intracavity electrocardiography signal in real time; detecting whether a pacing parameter adjustment instruction is triggered, and if so, calling and displaying the signal stored in real time on a pacing parameter adjustment interface on the same screen. After the intracavity electrocardiography signal is acquired, a temporary cardiac pacemaker carries out a series of processing on the electrocardiography signal, and gives a display response according to a selection. When display is carried out, a real-time continuous signal or a waveform signal, with more detailed information, of a single electrocardiography event can be displayed, and the current perception sensitivity can also be simultaneously indicated, facilitating rapid determination and adjustment of corresponding parameters by a user.

Methods and systems of evaluating cardiac pacing in candidate patients for cardiac resynchronization therapy and cardiac resynchronization therapy patients are disclosed. The methods and systems disclosed allow treatments to be personalized to patients by measuring the extent of tissue capture from cardiac pacing under various therapy parameter conditions. Systems and methods of optimizing right ventricle only cardiac pacing are also disclosed.

The exemplary systems and methods may be configured to generate a dispersion signal from a plurality of cardiac signals and determine a QRS onset time value and a QRS offset time value from the plurality of cardiac signals. The QRS onset and offset time values may be used to measure, or capture, activation times.

Embodiments of a wearable cardioverter defibrillator (WCD) system are configured to monitor a patient's ECG for shockable arrhythmias and deliver a shock to the patient in response to such a detection. To monitor the patient's ECG with reduced signal noise to improve the system's performance, the system includes a cable assembly having: a signal line; an inner shield and an outer shield; an ECG electrode electrically connected to the signal line of the cable assembly; and an amplifier having first and second input nodes respectively connected to the signal line and the outer shield of the cable assembly. The amplifier's output node is electrically connected to the inner shield of the cable assembly to reduce the reactive load seen by the patient's heart in driving the ECG sensing circuitry, which reduces the noise on the ECG signal outputted by the amplifier.

Implantable medical device systems and methods configured to use a detection profile selected from among a plurality of detection profiles to define a detection threshold for identifying cardiac events, in which a close call definition is used to determine which of the plurality of detection profiles is to be chosen. Upon identifying a close call, in which an overdetection nearly occurred but did not actually take place, a relatively less sensitive detection profile is chosen.

A system including a medical device is provided. The medical device includes at least one sensor configured to acquire first data descriptive of a patient, first memory storing a plurality of templates, and at least one processor coupled to the at least one sensor and the first memory. The at least one processor is configured to identify a first template of the plurality of templates that is similar to the first data, to determine first difference data based on the first template and the first data, and to store the first difference data in association with the first template. The system may further include the programmable device.

In a medical device system, a computer apparatus is configured to receive body surface electrical signals from an electrode apparatus including multiple external electrodes. The computing apparatus generates electrical dyssynchrony data from the body surface electrical signals during delivery of His bundle pacing pulses and identifies effective His bundle capture based on the electrical dyssynchrony data. The computing apparatus generates an indication of His bundle capture in response to identifying the effective His bundle capture.

A system and method for controlling a monitoring mode or treatment mode of an implantable medical device based on the detection of an external signal. The system and related method allow for more frequent monitoring of medical parameters at times where more frequent monitoring is necessary, such as during or after a dialysis session, with less frequent monitoring at other times, allowing for a more efficient medical device. The invention also allows for the frequency or mode of treatment by the implantable medical device, or the transmission of data from the implantable medical device to be controlled based on the external signal.

Disclosed herein are implantable medical devices (IMDs) including a receiver and a battery, and methods for use therewith. The receiver includes first and second differential amplifiers, each of which monitors for a predetermined signal within a frequency range and drains power from the battery while enabled, and while not enabled drains substantially no power from the battery. To remove undesirable input offset voltages, each of the differential amplifiers, while enabled, is selectively put into an offset correction phase during which time the predetermined signal is not detectable by the differential amplifier. At any given time at least one of the first and second differential amplifiers is enabled without being in the offset correction phase so that at least one of the differential amplifiers is always monitoring for the predetermined signal. In this manner, the receiver is never blind to signals, including the predetermined signals, sent by another IMD.