Which postop patient faces the greatest respiratory risk?
D000368:Aged; D001945:Breathing Exercises; D005260:Female; D006801:Humans; D008171:Lung Diseases / Q000209:etiology / Q000451:nursing / Q000517:prevention & control*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000451:nursing / Q000517:prevention & control*; D012119:Respiration; D012120:Respiration Disorders / Q000209:etiology / Q000451:nursing / Q000517:prevention & control*; D012306:Risk