A bundle branch block (BBB) is a block of the right or the left bundle branches that propagate depolarizations from the Sino-Atrial node to and through the ventricles. The signal is conducted first through the healthy branch, and then it is distributed to the damaged side.

2024年10月8日 · LBBB: Left Bundle Branch Block V1: Dominant S wave V6: broad, notched (‘M’-shaped) R wave. Associated features include: Left axis deviation (LAD); Poor R wave progression in precordial leads, and ; Appropriate discordance (discussed below)

2022年7月23日 · This article will focus on the physiology, pathophysiology, and clinical consequences of damage to the bundle branches, including left bundle branch block (LBBB) and right bundle branch block (RBBB).

2013年11月1日 · Why does a LBBB have a “big S Wave” and RBBB a “big R Wave” in lead V1? In RBBB, the last depolarization to occur is in the right ventricle therefore the left ventricle …

The first category, "Investment", includes ratings ranging from AAA to BBB-. It groups together the ratings given to companies considered financially solid. The second category "Speculative" ranges from BB + to D. It concerns companies at risk. Rating and grades. The ratings are 12 in number. They range from AAA to D.

Bundle branch block is partial or complete interruption of impulse conduction in a bundle branch; fascicular block is similar interruption in a hemifascicle of the left bundle. The disorders often coexist. There are usually no symptoms, but presence of either suggests a heart disorder.

2024年6月19日 · Investment grade is considered to be rated BBB- or higher for Fitch and S&P Global. Investment grade for Moody’s is considered Baa3 or higher.

Fitch’s credit rating scale for issuers and issues is expressed using the categories ‘AAA’ to ‘BBB’ (investment grade) and ‘BB’ to ‘D’ (speculative grade) with an additional +/- for AA through CCC levels indicating relative differences of probability of default or recovery for issues.

2022年1月18日 · In Left Bundle Branch Block (LBBB) the conduction is interrupted to both the left anterior fascicle and the left posterior fascicle. In Right Bundle Branch Block (RBBB) the right bundle has conduction blocked.

2022年6月11日 · Bundle branch block is a condition in which there's a delay or blockage along the pathway that electrical impulses travel to make the heart beat. It sometimes makes it harder for the heart to pump blood to the rest of the body.