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).
But he does recommend that people taking these drugs talk to their doctors to see if they are at greater than average risk for having a heart attack. The study did not find a link between heart attacks and another popular family of heartburn drugs, called H2 blockers (such as Tagamet, Pepcid and Zantac). But other scientists aren't ready to recommend the switch to those drugs, which are considered to be somewhat less effective for many people with serious heartburn.