DIAGNOSIS Scanning the Lungs For Blood Clots Whenever a large blood clot blocks the artery leading from the heart to the lungs, the result is so dramatic and catastrophic in many cases, fatal that doctors find the difficulty relatively easy to diagnose. But small clots that block some of the smaller arterial branches are far more common than such massive pulmonary embolisms. The trouble is, they are so hard to detect that the true nature of the illness is often missed. Patients complain of shortness of breath, they faint frequently, and they...
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