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).
Thrombolytic drugs are an important type of heart attack medication; they are used to dissolve blood clots that are blocking blood flow to the heart. Other types of medication for a heart attack include beta blockers, anticoagulants, and antiplatelets.