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).
The medications used to treat heart failure include three groups of drugs: diuretics, ACE inhibitors, and beta-blockers. The type of medication your doctor will recommend depends on the type of heart failure you have and how severe your symptoms are. If you've been diagnosed with heart failure, you mostly likely will be started on a diuretic first, if needed, followed by an ACE inhibitor, then a beta-blocker.