![]() ![]() ![]() Positions of implanted pacemaker and leads for different types of pacemakers (RA-right atrium, RV-right ventricle, LV-left ventricle). A typical surgical intervention for this condition would be to implant a pacemaker device (pulse generator) just under the skin of the patient’s chest, with endocardial leads routed through the veins directly to the heart, as shown in Figure 3. For example, bradycardia occurs when the heart beats too slowly or misses beats. When the electrical system doesn’t work perfectly, many different heart conditions can occur. Graphical ECG representation of electrical action during heart muscle contractions. Their contraction (the R wave) moves oxygenated blood from the left ventricle into and through the body-and deoxygenated blood from the right ventricle to the lungs. From the AV node, the electrical signal propagates, via the His-Purkinje system, to the ventricles, causing the ventricle muscles to contract. This electrical impulse generates the P wave, which can be seen on the ECG capture in Figure 2. Heart muscle showing SA (1) and AV (2) nodes. The SA node acts as the pacemaker for the system (Figure 1). The heart, a biochemical-electromechanical system, develops an electrical impulse that travels from the sinoatrial (SA) node in the upper right atrium to the atrioventricular (AV) node. ![]() This article describes the nature of pacing artifacts and introduces a device and methodology to detect them. Buried in noise and larger cardiac signals, these artifacts can be difficult to detect. The electrical signature-or artifacts-of the pacing signal consists of small, narrow pulses. When heart patients with implanted pacemakers undergo electrocardiogram (ECG) testing, a cardiologist must be able to detect the presence and effects of the pacemaker. Detecting and Distinguishing Cardiac Pacing Artifacts ![]()
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