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 used to lower blood pressure and slow the heart. The following drugs are on a common list of beta blockers.: According to the American Heart Association (AHA), commonly prescribed beta blockers include: -Acebutolol (Sectral) -Atenolol (Tenormin) -Betaxolol (Kerlone)