| http://www.w3.org/ns/prov#value | - Since the development of hypoplastic left heart syndrome may be progressive over the course of pregnancy rather than congenital, a normal four-chamber view early in the pregnancy is very helpful when defending a missed hypoplastic left heart syndrome case. (Other examples of conditions that progress over the course of pregnancy that also may not be detected at the 18-20 weeks exam include hydronep
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