Verifying the Placement of Nasogastric Tubes at an Emergency Center: Comparison of Ultrasound with Chest Radiograph

Table 4

Comparison of the subxiphoid ultrasound + air-water mixture with direct radiograph.

		Direct Radiograph		Total	Sensitivity	Specificity	PPV	NPV
		Negative	Negative
Subxiphoid US; +; Air-Water Mixture	Negative	2	4	6	91.49%	100%	100%	33.33%
	Positive	0	43	43
Total		2	47	49