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An important potential finding with echo is McConnell's sign, where only the RV apex wall contracts; [7] it is specific for right heart strain and typically indicates a large PE. [8] On an electrocardiogram (ECG), there are multiple ways RV strain can be demonstrated. A finding of S1Q3T3 [b] is an insensitive [10] sign of right heart strain. [11]
It is an abnormality of repolarization and it has been associated with an adverse prognosis in a variety heart disease patients. It has been important in refining the role of ECG LVH criteria in cardiac risk stratification. It is thought that a strain pattern could also reflect underlying coronary heart disease.
A right bundle branch block (RBBB) is a heart block in the right bundle branch of the electrical conduction system. [1] During a right bundle branch block, the right ventricle is not directly activated by impulses traveling through the right bundle branch. However, the left bundle branch still normally activates the left ventricle.
The right ventricle is one of the four chambers of the heart. It is located towards the right lower chamber of the heart and it receives deoxygenated blood from the right upper chamber (right atrium) and pumps blood into the lungs. Since RVH is an enlargement of muscle it arises when the muscle is required to work harder.
Strain rate is the rate of deformation, and is negative during systole, when the ventricle shortens. Strain rate, however, becomes positive when the ventricle lengthens. Thus the more rapid phase shifts show details of the lengthening, displaying that it is not homogeneous. Strain rate colour curved anatomical M-mode. The yellow line is drawn ...
Bifascicular block is a combination of right bundle branch block and either left anterior fascicular block or left posterior fascicular block. Conduction to the ventricle would therefore be via the remaining fascicle. The ECG will show typical features of RBBB plus either left or right axis deviation. [7] [8]
The myocytes of the heart (also called the myocardial fibers) are arranged in a general circumferential direction in the ventricles. In the left ventricle (LV), the fiber will change gradually in direction from a certain longitudinal-circumferential direction in the outer layer of the heart (epicardium) to another angulated direction almost orthogonal in the inner wall (endocardium), becoming ...
The speckle pattern is a mixture of interference patterns and natural acoustic reflections. [1] These reflections are also described as speckles or markers. The pattern being random, each region of the myocardium has a unique speckle pattern (also called patterns, features, or fingerprints) that allows the region to be tracked. The speckle ...