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Mayo Clinic Family Health Book
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Mayo_Clinic_Family_Health_Book_1993_WIN-DOS.iso
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v01_21.cap
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1993-09-22
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245b
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241An unwanted opening between two of the chambers of the heart--ventricular septal defect--allows blood to flow under high pressure to the lungs. In many cases, the defect resolves itself, but in some instances surgical correction is required.