Network protocols that use aggressive retransmissions to compensate for packet loss due to congestion can increase congestion, even after the initial load has been reduced to a level that would not normally have induced network congestion. Such networks exhibit two stable states under the same level of load.
Beta blocker. Beta blocker, also written Î²-blocker, is a class of medications that are particularly used to manage cardiac arrhythmias, and to protect the heart from a second heart attack (myocardial infarction) after a first heart attack (secondary prevention).
Some of the main medicines for heart failure include: 1  ACE inhibitors. 2  beta-blockers. 3  angiotensin receptor blockers (ARBs) 4  hydralazine with nitrate. 5  diuretics. 6  aldosterone antagonists. 7  sacubitril valsartan. 8  ivabradine. 9  digoxin.