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).
Calcium channel blockers can reduce blood pressure by dilating the arteries and, in some cases, reducing the force of the heart's contractions. 1  Amlodipine - Norvasc, also sold as Caduet and Lotrel. 2  Diltiazem - Cardizem, also sold as Dilacor and Tiazac. 3  Felodipine - Plendil.  Isradipine 1  - DynaCirc. Nicardipine - Cardene.