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Electrocardiogram
Published in Kayvan Najarian, Robert Splinter, Biomedical Signal and Image Processing, 2016
Kayvan Najarian, Robert Splinter
Another related block is the RBBB. If the right bundle branch is defective to the point that electric impulse cannot travel through it to the right ventricle, activation will reach the right ventricle by excitation from the left ventricle. The depolarization now travels first through the septal and right ventricular muscle. This progress is, of course, slower through the conduction system and leads to a QRS complex wider than 0.1 s. Often, the criterion for the duration of QRS complex in RBBB and LBBB is that the duration of QRS needs to exceed 0.12 s. In RBBB, activation of the right ventricle is delayed to the point that it can be seen following the activation of the left ventricle. At this point, activation of the left ventricle still takes place as normal. RBBB causes an abnormal QRS heart vector and points toward the right ventricle. This is seen in the lead I recording of the ECG as a broadened S wave. Another typical manifestation of RBBB is frequently observed in lead V1 as a double R wave, called an RSR’ complex. Figure 9.15 shows a representative ECG of an RBBB.
Solving Inverse Problem in Magnetocardiography by Pattern Search Method
Published in IETE Journal of Research, 2021
Pragyna Parimita Swain, S. Sengottuvel, Rajesh Patel, Awadhesh Mani, Raja J. Selvaraj, Santhosh Satheesh
Right Bundle Branch Block (RBBB) is a conduction anomaly that occurs due to the blockage of the right bundle branch of the electrical conduction system of the heart. As a result of this block, the right ventricle is not directly activated by the usual route of conduction and passively gets activated through myocardial muscle (causing delayed conduction) after the depolarization of the left ventricle. In Figure 8(a), the averaged cardiac traces collected from all thirty-six locations over the thorax of a subject with RBBB are superposed and shown as the butterfly plot. As opposed to the narrow QRS peak signifying fast activation of both ventricles in a normal subject, QRS is found to be relatively broad (exceeding 150 ms) in subjects with RBBB. We analyzed the cardiac source around the S peak time instant to highlight this characteristic anomaly associated with bundle branch blocks. By dividing the R-S interval (from the end of the R peak to the end of S peak) into 8 equal intervals of 12 ms duration in each slot, the cardiac sources are estimated and analyzed as shown in Figure 8(b).
Comparison of methods for delivering cardiac resynchronization therapy: electrical treatment targets and mechanisms of action
Published in Expert Review of Medical Devices, 2023
Florentina Simader, Ahran Arnold, Zachary Whinnett
Patients with the features of RBBB have a worse prognosis than those with a normal 12-lead ECG [2,18]. RBBB can adversely affect cardiac function as a result of dyssynchronous right ventricular activation and may also adversely impact ventricular filling [19]. Some patients with RBBB have evidence of an additional left ventricular activation delay, which may be suggested by the presence of left axis deviation [20]. These patients may have greater potential for improvement with electrical treatment, as they experience more disruption to ventricular activation.