Term
| Obesity is a restrictive lung disease, T or F |
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Definition
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Term
| In the obese pt, FRC may fall below closing capacity, what will ensue? |
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Definition
| distal alveoli will close and cause a V/Q mismatch |
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Term
| In the obese pt, how are their O2 and CO2 blood levels changed? |
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Definition
| increased O2 consumption coupled with restrictive lung condition reduces SaO2, while increased fat metabolism and reduced excretion increases PaCO2 |
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Term
| What is mainly responsible for the obesity related reduction in chest wall/lung compliance? |
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Definition
| enormus amounts of fat on the chest |
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Term
| Name the two main disorders of ventilatory control in fattys |
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Definition
| OSA and pickwickian syndrome |
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Term
| Is OSA related to daytime hypersomnolence, and why? |
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Definition
| sure thing, because they have periodic partial or complete obstruction of the airway, resulting in repetitive arousal to restore patency |
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Term
| What are three big pathological conditions that result from OSA? |
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Definition
| O2 desaturation, hypercarbia, and cardiovascular dysfunction |
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Term
| I have had a little too much to drink and have stumbled back to my hotel room and after scarfing down some chicken wings, have passed out naked on the bed. A particular room mate has walked in and after stating that he would never lick my taint, he has noticed that I am snoring and I have decreased airflow of >50% and a decreased O2 saturation, what breathing pattern is being exhibited? |
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Definition
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Term
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Definition
| cessation of airflow for greater than 10 sec. |
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Term
| Osa is associated with BMI of >30, visceral obesity and increased neck girth, what specific neck circumfrences in men and women are at high risk? |
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Definition
| men >17in. and women >16in. |
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Term
| I have been playing with my daddies horse tranquilizers and accidently shot my obese uncle bob in the ass. he is passing out quick and I know he has OSA, what is he at risk for? |
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Definition
| airway collapsing, due to large craniofacial structures and increase in pharangeal tissue, when he loses the neuromuscular control the airway is likely to collapse |
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Term
| What two factors contribute to airway patency? |
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Definition
| pharyngeal dilator muscle contraction and air volume/pressure in the airway |
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Term
| what two main factors contribute to airway collapse? |
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Definition
| Negative pressure on inspiration and extralumenal positive pressure (fat deposits and small mandible) |
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Term
| obesity decreases airway lumen size by increasing what structure size? |
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Definition
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Term
| small maxilla/mandible pts have a reduction in airway size due to what? |
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Definition
| a reduction in the bony inclosure |
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Term
| during wakefullness, an OSA pt has reflex driven constriction of pharyngeal dilator muscles which maintain airway patency, during sleep this reflex is much less powerful, predisposing them to what? |
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Definition
| due to more soft tissue or a small bony space the extraluminal pressure will rise and the airway will narrow or collapse |
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Term
| describe the OSA sleep cycle |
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Definition
| pt falls asleep, reduction in reflex muscle activation causes fat to obstruct the airway, pt snores, hypoxia and hypercarbia ensue, pts brain says wake the F up dude, pts ventilation returns to "normal" and they fall asleep, repeat |
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