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LBBB - Clinical Significance LBBB-MH LBBB is usually a sign...

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Clinical Significance: LBBB -MH LBBB is usually a sign of organic heart disease. It may develop in patients with long standing hypertension, valvular lesion (e.g. aortic stenosis, or aortic regurgitation), or different types of cardio myopathy. It is also seen in patients with CAD. Often there may be two contributing factors (e.g. CAD and hypertension). It may be permanent or transient. May be the first clue to four previously undiagnosed but clinically important abnormalities. These are advanced CAD, valvular disease, hypertensive heart disease, and cardiomyopathy. Complete and incomplete LBBB Complete LBBB, the QRS complex has the characteristics appearance described previously and is 0.12 second or wider. Incomplete LBBB, the QRS is between 0.1 and 0.12 second wide Pathoyphysiology Recall that the first phase of ventricular stimulation—depolarization of the left side of the septum—is started by a branch of the left bundle. LBBB therefore blocks this normal pattern. When LBBB is present, the septum depolarizes from right to left and not from
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