See Also: Complete Heart Block (heart block)(health)
block-out(medicine)
A-V block(medicine)
Block(medicine)
block(2)(dictionary)
block(1)(dictionary)
Jo block(dictionary)
Ivy block(health)
Block(finance)
Block(money)

B-17 (sh) and A-V block (medicine)


B-17 (sh)




or Flying Fortress

U.S. heavy bomber used in World War II. Designed by the Boeing Aircraft Co. in 1934, it cruised at 35,000 ft (10,700 m) at a maximum speed of 287 mph (462 kph).

It was called the Flying Fortress because of the .50-caliber machine guns, 13 in all, at every corner. It could carry 3 tons (2.7 metric tons) of bombs in its bays and more on racks under its wings. More than 12,000 B-17s were produced during World War II, and most were used for high-level bombing over Europe.


A-V block (medicine)


A-V block -->
atrioventricular block
<cardiology> A conduction disturbance that results in the inappropriate delay (or complete inability) of a electrical impulse, generated in the atria, to reach the ventricles (via the atrioventricular node).

Clinical types are divided into first (nonserious), second and third degree (most serious).

Some drugs may precipitate atrioventricular block (for example clonidine, methyldopa, verapamil). A permanent pacemaker may be required for a third degree (complete) heart block.