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Experience with a Simplified, Standardized 4-Hour Gastric-Emptying Protocol

¹ Division of Nuclear Medicine, Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins Medical Institutions, Baltimore, Maryland; and ² Division of Gastroenterology, Department of Medicine, Johns Hopkins Medical Institutions, Baltimore, Maryland

View larger version (14K): [in this window] [in a new window]   FIGURE 1.  ROC curves for 1-h (), 2-h (), and 3-h () retention, with 4-h retention of more than 10% as the standard for delayed emptying. AUC values were 0.75, 0.93, and 0.97 at 1, 2, and 3 h, respectively. FPF = false-positive fraction; TPF = true-positive fraction.

View larger version (12K): [in this window] [in a new window]   FIGURE 2.  ROC curves for lag defined as first appearance of bowel activity (), and lag defined as 5% emptying from peak activity (). FPF = false-positive fraction; TPF = true-positive fraction.