![]() § Pneumonia may not develop fro several days following the incident § Chemical pneumonitis may appear almost instantly while aspiration of bland material may take hours to manifest O Fleeting infiltrate (lasts less than one or two days) if bland and non-infected O Conventional chest radiography is usually all that is needed to make the diagnosis O Slow onset if bacterial pneumonia ensues O Acute onset of respiratory distress, if gastric acid Chronic aspiration pneumonia results from repeated aspiration of foreign material over a prolonged time.§ Aspiration which occurs while the person is prone may be seen in the right upper lobe and middle lobe or the lingula Because of the larger caliber and straighter course of the right main bronchus.§ Lower lobes, especially right-sided, including and especially the superior segments of the lower lobes Aspiration, no matter what the type, usually occurs in the gravity dependent portions of the lung.§ Anaerobic organisms typically produce a longer lasting pneumonia Broncho-pleural fistulae and para-pneumonic effusions or empyema may develop.§ Anaerobic infections commonly necrotize, so cavities may be present Hospital-acquired infections tend to be caused by Pseudomonas and other gram-negative organisms.Community–acquired infections tend to be caused by Strep pneumoniae, Staph aureus, Haemophilus flu and Enterobacteriaceae.O Aspiration of bacteria can produce pneumonia § Although frequently referred to as a pneumonia, it does not typically produce an infectious response and is not a true pneumonia O Aspiration of water or neutralized gastric acid may produce fleeting disease that can resolve in hours § If massive, the pattern will resemble pulmonary edema § Can produce near-instantaneous development of airspace disease ![]() O Un-neutralized gastric acid produces a chemical pneumonitis Pattern of disease depends on what is aspirated into lungs.The likelihood of symptomatic aspiration depends in part on the type of material aspirated, the volume aspirated, both of which may be related to the state of consciousness of the individual.§ Esophageal diverticula, such as Zenker’s Defined as the passage of material from the oropharynx into the tracheobronchial tree.
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