A method to monitor a patient's heart health is described. The method may include processing at least one electrocardiogram (ECG) signal and diagnosing an episode of nonsustained ventricular tachycardia (NSVT) based at least in part on the processing of the at least one ECG signal. In some embodiments, the NSVT episode may satisfy an NSVT time duration and a QRS criterion. The NSVT time duration may be between 5 seconds and 15 seconds. In some instances, the QRS criterion may be a temporary QRS template of two sequential incoming QRS complexes. In some embodiments, the method may determine a similarity between the temporary QRS template and at least two subsequent QRS complexes by calculating a feature correlation coefficient between the QRS template and the subsequent QRS complexes.

An example method is performed by a defibrillator that includes a therapy cable receptacle and an electrocardiogram (ECG) cable receptacle. The method includes displaying a user interface that includes a primary channel for displaying a primary waveform and a secondary channel for displaying secondary data; detecting a patient connection for therapy pads of a therapy cable; responsively, displaying a pads lead obtained via the therapy pads in the primary channel; subsequently, detecting a lack of a patient connection for the therapy pads; detecting a patient connection for an ECG lead obtained using an ECG cable; and, based on detecting the lack of the patient connection for the therapy pads and detecting the patient connection for the ECG lead, replacing the pads lead displayed in the primary channel with a representation of an ECG signal obtained using the ECG cable in the primary channel.

A wearable cardiac monitoring device is described. The wearable cardiac monitoring device includes a sensor, a support structure configured to position the sensor to sense a cardiac parameter when the support structure is worn by a patient, and a processor communicatively coupled to the sensor. The processor is configured to detect an event at the wearable cardiac monitoring device, determine a category of the detected event based on at least one of a plurality of device conditions, and determine whether the detected event has ended. The processor is further configured to determine an offset time for the categorized event based on the at least one of the plurality of device conditions and delay a resolution of an alert based on the offset time.

A self-applicable defibrillator is provided. The defibrillator includes four walls each affixed on one side of a bottom surface. A dividing layer is affixed to each of the four walls creating an electrode enclosure and a circuit enclosure configured to hold circuitry. Access to the circuitry is restricted by the bottom surface and dividing layer. A pair of pads are stored in the electrode enclosure to monitor cardiac rhythm of a user. Each of the pads are placed on the user, by the user, after the user experiences a cardiac precursor. A cover is configured to fit over the electrode enclosure on a side opposite the circuit enclosure, and the cover is opened for the user to access the pads for placement.

An implantable medical device and method are described that include a housing, a right ventricle (RV) near field (NF) electrode, a far field (FF) electrode, and sensing circuitry. The housing contains one or more processors. The RV NF electrode is electrically connected to the one or more processors and configured to be located within the RV of a heart of a patient and either in contact with ventricular myocardial tissue of the heart or within a threshold proximity of the ventricular myocardial tissue. The FF electrode is configured to be positioned beyond the threshold proximity of the ventricular myocardial tissue. The sensing circuitry is coupled to the RV NF electrode and the FF electrode and configured to define an atrial sensing vector to collect atrial sensing data associated with atrial cardiac activity. The one or more processors are configured to receive the atrial sensing data.