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).
CHOICE OF BETA BLOCKER. Carvedilol (Coreg), bisoprolol (Zebeta) and metoprolol succinate (Toprol XL) have all been shown to be beneficial in patients with chronic heart failure. At present, the U.S. Food and Drug Administration has labeled only carvedilol for use in slowing the progression of chronic heart failure.atients with severe heart failure, especially inotrope-dependent and hospitalized patients, and those with hypotension, bradycardia or higher than first-degree heart block are not considered appropriate candidates for beta blocker therapy. Optimal diuresis is essential for maximal tolerability.