Drugs acting on the respiratory system an understanding of how drugs interact with the respiratory system is vital for anaesthetists and those working in critical care knowledge of the drugs discussed in this chapter will facilitate effective management of common potentially life threatening medical emergencies. Only in the alveoli does actual gas exchange takes place there are some 300 million alveoli in two adult lungs these provide a surface area of some 160 m2 almost equal to the singles area of a tennis court and 80 times the area of our skin. The beta 2 adrenoceptor agonist drugs used in respiratory medicine function as long acting bronchodilators labasthey are prescribed as single agents or in combination with inhaled corticosteroids or muscarinic receptor antagonists single agent long acting beta 2 agonists salmeterol prescribed for reversible airways obstruction nocturnal asthma and prevention of exercise induced . Drugs acting on respiratory system terbutaline and metaproterenol are short acting drugs salmeterol and formoterol are long acting drugs mechanism of action beta adrenoceptor agonist stimulate adenylyl cyclase and increases cyclic adenosine monophosphate camp in smooth muscle cells clinical use short acting beta2 agonists are the . Test bank go all free home other subject business mathetc review chapter 54 drugs acting on the upper respiratory tract my nursing test banks 1 a patient comes to the clinic with symptoms as seen in a cold it may take up to 2 weeks to get the full clinical effect try to keep using the drug as ordered b the drug must
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