PMID: 17859440 Issn Print: 0003-4932 Publication Date: 1949/09/01 Print Facebook Twitter LinkedIn Email THE VALSALVA MANEUVER; AN AID FOR THE CONTRAST VISUALIZATION OF THE AORTA AND GREAT VESSELS Norman E. Freeman; Thomas M. Fullenlove; Edwin J. Wylie; Rutherford S. Gilfill-an Checking for direct PDF access through Ovid View on Journal Site Excerpt