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).
Heart Rate Controlling Medications. 1  Beta blockers. 2  These are drugs used to slow the heart rate. 3  Most people can function and feel better if their heart rate is controlled. 4  Read more about beta blockers.