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).
Many people who have frequent or severe migraines may use preventive medications, including beta-blockers such as propranolol. Beta-blockers, which slow the heart rate, are used mostly to treat heart conditions. âThese medications arenât for migraine patients who have asthma, certain lung problems or slow heart rate,â Bastings warns. Certain antiepileptic drugs, such as topiramate and divalproex sodium, are also prescribed for migraines.