There are several types of left bundle branch block, each producing its own characteristic mechanism of failure. In each case, the nerve impulse is blocked or delayed. Patients with LBBB may have left ventricular disease or cardiomyopathy.
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Bundle branch block belongs to a group of heart problems called intraventricular conduction defects (IVCD).
veto
The question at hand is one that is not important. The Branch Davidians had apocalyptic expectations of a fiery end. The "bugs" placed by the FBI in the compound had evidence that a "fuel" was spread by the Davidians. Hay had been stacked up inside as a bullet block. These people, as much as they used firearms, knew hay would not stop a bullet. The hay was set to have the fire, Koresh preached about, spread more rapidly. Whether an explosion from the tear gas canister or an ignition from a Branch Davidian caused the fire is not important. The Branch Davidians had ample time to come out, surrender, and give up. They stayed and waited for the apocalypse in which Koresh taught. Either way, The Branch Davidians got what they had been looking for in their pursuit for salvation.
president
The executive branch has the power to veto bills that are passed by the legislative branch (the House of Representatives and the Senate). Likewise, the Senate is able to block that veto if there is a 2/3 majority.