Diagnostic Accuracy of EndoFaster® and Narrow-Band Imaging Endoscopy in Patients with Impaired Gastric Acid Secretion: A Real-Time Prospective Study

Table 3

Features of pH-false-negative patients (patients with normal acidity and histological presence of corpus atrophy) and pH-false-positive patients (patients with hypochlorhydria and histological absence of corpus atrophy).

	Characteristics	(%)	pH
3a. pH-false-negative patients ()	CAG
	(i) Mild atrophy	8 (66.7)	1.6, 0.9-2.3°
	(ii) Moderate atrophy	1 (8.3)	1.7
	(iii) Severe atrophy	2 (16.7)	2.1, 2.6
	pts with H. pylori infection	1 (8.3)
	Previously treated infection of H. pylori	8 (66.7)
	Smoking	3 (25.0)
	Alcohol (≥1 U/die)	5 (41.7)
	Therapy with ASA/NSAID	3 (25.0)
3b. pH-false-positive patients ()	Chronic superficial H. pylori-related corpus gastritis	3 (60.0)	3.5-4.5
	Chronic gastritis (negative HP)	2 (40.0)	≥4.5
	Previously treated H. pylori infection	1 (20.0)
	Smoking	0 (0.0)
	Alcohol (≥1 U/die)	3 (60.0)
	Therapy with ASA/NSAID	0 (0.0)

°Median, range. ASA: acetylsalicylic acid; NSAID: nonsteroidal anti-inflammatory drugs; CAG: corpus atrophic gastritis.