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10 Cards in this Set
- Front
- Back
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What is considered overweight, obese, and morbid obesity compared with ideal body weight?
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overweight: 20% greater, obese: 20-99% Greater; morbid obesity: 100% greater
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How do you calculate BMI?
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weight(kg)/height(meters)squared
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How do you classify overweight and obesity based on BMI?
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overweight=25-30; obese=30-40; severe obesity=any BMI >40, morbid obesity=40-50; super obesity=BMI>50
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What cardiac considerations should you consider preop in the obese patient?
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increase CO leading to HTN and LVH; Cor Pulmonale secondary to hypoxia induced increase in PVR and pulm HTN; CAD
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What respiratory considerations should you consider preop in the obese patient?
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restrictive lung disease picture(decreased FRC, VC, FEV-1 and increased shunt), closing volume is increased(closing capacity is not) and shunt is likely to occur(due to decreased FRC), ERV is decreased about 20%, CO2 values are frequently low or normal(hyperventilation to compensate for chronic hypoxia)
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What can cause closing capacity to increase?
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age, chronic bronchitis, LV failure, smoking, surgery,
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What can cause FRC to decrease?
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ascites, neonates, GA, pregnancy, ascites, supine position, obesity
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What gastric considerations should you consider preop in the obese patient?
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gastric volume is increased and pH of gastric fluid is decreased
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What happens to oxygenation in obese patients postop?
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maximal reduction in blood oxygenation in obese patients occurs 2-3 days postop, it takes 7-10 days for reductions in FRC, VC, and FEV1 to normalize
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What is closing capacity?
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closing volume + residual volume
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