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Most Frequent Causes - USMLE Step 1 - First Aid

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Most Frequent Cause of...
(Answer)
Addison's   Autoimmune (2nd MC: infection)  
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Aneurysm, dissecting   HTN  
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Aortic aneurysm, abdominal & descending aorta   Atherosclerosis  
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Aortic aneurysm, ascending   3° syphilis  
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Bacterial meningitis (adult)   Neisseria meningitidis  
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Bacterial meningitis (elderly)   Strep. pneumo.  
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Bacterial meningitis (kids)   H. influenzae type B  
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Bacterial meningitis (infants)   E. coli  
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Cancer assoc. w/ AIDS   Kaposi's sarcoma  
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Congenital adrenal hyperplasia   21-hydroxylase defic.  
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Cretinism   Iodine defic./hypothyroidism  
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Cushing's syndrome   Corticosteroids (2nd MC: ↑ACTH by pituitary)  
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Death in CML   Blast crisis  
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Death in SLE   Lupus nephropathy  
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Dementia   Alzheimer's (2nd MC: multi-infarct)  
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DIC   Gram-neg. sepsis, obstetric complications, cancer, burn trauma  
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Ejection click   Aortic/pulmonic stenosis  
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Food poisoning   S. aureus  
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Glomerulonephritis (adults)   IgA nephropathy (Berger's disease)  
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Hematoma—epidural   Middle meningeal a. (FAST)  
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Hematoma—subdural   Bridging v. (trauma; slow)  
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Hemochromatosis   Multiple blood transfusions (can → CHF and ↑ risk of HCC)  
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Hepatic cirrhosis   EtOH  
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Hepatocellular carcinoma   Cirrhotic liver (often assoc. w/ Hep B and C)  
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Holosystolic murmur   VSD, tricuspid regurg., mitral regurg.  
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HTN, 2°   Renal disease  
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Hypoparathyroidism   Thyroidectomy  
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Hypopituitarism   Adenoma  
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Infection in blood transfusion   Hep C  
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Infection in burn victims   Pseudomonas  
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Leukemia (adults)   AML  
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"Machine-like" murmur   PDA  
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Mental retardation   Down's (2nd MC: Fragile X)  
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MI   Atherosclerosis  
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Mitral valve stenosis   Rheumatic heart disease  
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Myocarditis   Coxsackie B  
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NephrOtic syndrome (adults)   Membranous GN  
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NephrOtic syndrome (kids)   MCD (assoc. w/ infections/vaccinations; ℞= corticosteroids)  
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Opening snap   Mitral stenosis  
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Osteomyelitis   S. aureus  
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Osteomyelitis, sickle cell disease   Salmonella  
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Osteomyelitis, IVDA   Pseudomonas  
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Pancreatitis (acute)   EtOH & gallstones  
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Pancreatitis (chronic)   EtOH (adults), cystic fibrosis (kids)  
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Peau d'orange   Breast cancer  
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PID   Neisseria gonorrhoeae (monoarticular arthritis)  
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Pneumonia, hospital-acquired   Klebsiella  
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Pneumonia, cystic fibrosis, burn infections   Pseudomonas aeruginosa  
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Preventable blindness   Chlamydia  
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1° amenorrhea   Turner's (XO)  
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1° hyperaldosteronism   Adenoma of adrenal cortex  
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1° hyperparathyroidism   Adenoma  
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Pulmonary HTN   COPD  
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R. heart failure, pulmonary cause   Cor pulmonale  
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R-sided heart failure   L-sided heart failure  
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Sheehan's syndrome   Postpartum pituitarty infartion, 2° to hemorrhage  
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SIADH   Small cell carcinoma of lung  
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UTI   E. coli  
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UTI, young ♀   E. coli & Staph. saprophyticus  
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