Antonio Ruiz de León

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Achalasia is a motor disorder of the esophagus resulting in functional obstruction. The cause of the lesion is unknown although genetic and immunologic factors have been suggested. An association with serological HLA epitopes has been previously reported. In this study, we have further examined this HLA class II association with susceptibility to achalasia(More)
The protein tyrosine phosphatase N22 (PTPN22) gene encodes a lymphoid-specific phosphatase (LYP), a downregulator of T-cell activation. Because a functional PTPN22 polymorphism, C1858T, has been found to be associated with different autoimmune diseases, we aimed to elucidate the role of this variant in predisposition to achalasia. We performed a(More)
Resting anal canal pressure was measured in 15 patients with anal fissure before and after lateral internal sphincterotomy. This pressure was found to be significantly higher in these subjects (mean 95 +/- 23.08 mm HG) than in the control group (mean 66.10 +/- 14.28 mm Hg) before surgery (P less than 0.005). After surgery, a normal anal canal pressure was(More)
OBJECTIVE To define the relationship between esophageal dysmotility and severity of gastroesophageal reflux (GER) at the distal and proximal levels. METHODS Two-level, 24-hour ambulatory pH monitoring and manometry of the esophagus were performed in 40 patients with abnormal distal acid exposure and in 20 healthy controls. Twenty patients with normal(More)
OBJECTIVES High-resolution manometry (HRM) is the preferred method for the evaluation of motility disorders. Recently, an update of the diagnostic criteria (Chicago 3.0) has been published. The aim of this study was to compare the performance criteria of Chicago version 2.0 (CC2.0) vs. 3.0 (CC3.0) in a cohort of healthy volunteers and symptomatic patients.(More)
OBJECTIVE Cutaneous electrogastrography (cEGG) is a technique used for recording gastric electrical activity through electrodes placed on the abdominal skin. Given its increasing use for different pathologies, we decided to study its reliability (or reproducibility), that had never been appropriately assessed before. METHODS Ambulatory cutaneous(More)
AIM Upper oesophageal pH monitoring may play a significant role in the study of extra-oesophageal GERD, but limited normal data are available to date. Our aim was to develop a large series of normal values of proximal oesophageal acidification. METHODS 155 healthy volunteers (74 male) participated in a multi-centre national study including oesophageal(More)
Hemochromatosis is a disorder of parenchymal iron overload. The diagnosis is based upon clinical manifestations, laboratory findings and iron concentration in liver. Magnetic resonance imaging (MRI) shows a decrease in liver signal intensity. Its role has not been already defined. Nonetheless, ratio of liver to muscle proton density (LMPD) shows a(More)