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).
1 Inotropes. 2  These are intravenous medications used in people with severe heart failure in the hospital to improve heart pumping function and maintain blood pressure. 3  Digoxin (Lanoxin). 4  This drug, also referred to as digitalis, increases the strength of your heart muscle contractions. 5  It also tends to slow the heartbeat.his class of drugs not only slows your heart rate and reduces blood pressure but also limits or reverses some of the damage to your heart if you have systolic heart failure. Examples include carvedilol (Coreg), metoprolol (Lopressor) and bisoprolol (Zebeta).