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).
Medications given to treat a heart attack include: 1  Aspirin. 2  Thrombolytics. 3  Antiplatelet agents. 4  Other blood-thinning medications. 5  Pain relievers. 6  Nitroglycerin. 7  Beta blockers. 8  ACE inhibitors.