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In a population-based study, emphysema was quantified by computed tomography, pulmonary function was assessed by spirometry, and cardiac volumes and function were measured by magnetic resonance imaging. Both percent emphysema and the severity of airflow obstruction were linearly related to reductions in left ventricular end-diastolic volume, stroke volume, and cardiac output. These effects were more pronounced among smokers.
A 74-year-old man with a history of hypertension and myocardial infarction that had occurred in the remote past presents with breathlessness on exertion. On examination, his pulse is 76 beats per minute and his blood pressure is 121/74 mm Hg. There is jugular venous distention and edema in the lower limbs; the lungs are clear. An echocardiogram shows left ventricular dilatation and an ejection fraction of 33%. How should his case be managed?
Williams–Beuren syndrome, a multisystem disorder caused by the deletion of a chromosome region of 1.5 million to 1.8 million base pairs containing 26 to 28 genes, is a disorder of microdeletion or contiguous gene deletion. This review covers current understanding of the biology of this disorder.
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A 47-year-old man was admitted to this hospital because of abdominal pain of 5 weeks' duration, which radiated to the flank. He had had intermittent abdominal pain and constipation for 15 years. He was born in Central America and lived in rural and urban areas until immigrating to the United States more than 25 years before admission. Computed tomography of the abdomen revealed renal abnormalities consistent with infarcts. Echocardiography revealed a left ventricular aneurysm with thrombus. A diagnostic test was performed.
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