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).
Beta-blockers are often prescribed for irregular heartbeats (arrhythmias), high blood pressure, and after heart attacks. Theyâre a class of medication used to block the effects of stress hormones like adrenaline (also called epinephrine) on the heart. Less commonly, beta-blockers may be used to treat: glaucoma.