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During typical AVNRT, electrical impulses travel down the slow pathway of the AV node and back up the fast pathway. The fundamental mechanism of AVNRT is a presence of a dual atrioventricular node physiology (present in half of the population), which acts as a re-entrant circuit within the atrioventricular node. [4] This can take several forms.
This is the property of the AV node that prevents rapid conduction to the ventricle in cases of rapid atrial rhythms, such as atrial fibrillation or atrial flutter. The AV node's normal intrinsic firing rate without stimulation (such as that from the SA node) is 40–60 times/minute. [ 13 ]
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The regulations [2] replaced the 'Noise at work regulations 1989' which previously covered noise in the workplace. [1] The regulations came into force for most industries on 6 April 2006 with the music and entertainment sectors coming into line two years later on 21 April 2008. [3] In Northern Ireland the legislation is dealt with in 'The ...
The Bureau of Labor Standards of the Department of Labor has worked on some work safety issues since its creation in 1934. [4] Economic boom and associated labor turnover during World War II worsened work safety in nearly all areas of the United States economy, but after 1945 accidents again declined as long-term forces reasserted themselves. [5]
Though the regulations do not impose a specific obligation on employees, they have a general obligation under section 7 of the Health and Safety at Work etc. Act 1974 to take care of safety. The Health and Safety Executive recommends that they report incidents to their employer and encourages voluntary notification to the relevant regulating ...
The Fire Precautions (Workplace) Regulations 1997 Image title Fire certificates, Fire, Fire safety, Health and safety at work, Health and safety requirements, FIRE PRECAUTIONS, HEALTH AND SAFETY
Long title: An Act to assure safe and healthful working conditions for working men and women; by authorizing enforcement of the standards developed under the Act; by assisting and encouraging the States in their efforts to assure safe and healthful working conditions; by providing for research, information, education, and training in the field of occupational safety and health; and for other ...