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).
Medication may be needed to maintain normal heart rhythm and prevent stroke. âOne to three types of medication are used in combination: those that control heart rate, such as beta blockers; anti-arrhythmic drugs to maintain normal rhythm; and anticoagulants to prevent blood clots,â says Dr. Saliba.