D Y Graham

Baylor College of Medicine, Houston, Texas, United States

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Publications (440)3484.11 Total impact

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    Dataset: feltre

    Full-text · Dataset · Apr 2013
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    M Rugge · M Fassan · M Pizzi · D Y Graham

    Full-text · Article · Apr 2013 · Alimentary Pharmacology & Therapeutics
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    D Y Graham · L A Fischbach

    Preview · Article · Apr 2012 · Alimentary Pharmacology & Therapeutics
  • Article: Gastritis
    Massimo Rugge · David Y. Graham
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    ABSTRACT: Gastritis is defined as inflammation of stomach mucosa and its classification is based on etiology. Diagnostic tools includes clinical evaluation, serology (pepsinogens, and antibodies against infectious agents and/or auto-antigens), endoscopy (standardized biopsy protocols should be applied), and histology. Histology distinguishes non-atrophic versus atrophic gastritis (atrophy= loss of appropriate glands). Atrophy and (even more) non-invasive neoplasia are precancerous lesions. The histology report should be clinically informative: a recently suggested histology reporting format (OLGA staging system) relates the gastric disease to its cancer risk. According to their etiology, the main forms of gastritis are infectious (H.pylori), chemical, and autoimmune
    No preview · Article · Aug 2010
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    D Y Graham · F K L Chan

    Preview · Article · Nov 2009 · Alimentary Pharmacology & Therapeutics
  • M P Dore · DY Graham
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    ABSTRACT: Significant advances continue to be made in the area of gastritis and ulcer disease. Studies to identify the most appropriate use of capsule endoscopy have now confirmed that it is superior to other methods for identifying small-bowel mucosal pathology and sites of obscure gastrointestinal bleeding. It has increasingly been recognized that the complications of ulcer disease are secondary to the use of nonsteroidal anti-inflammatory drugs (NSAIDs) and to interactions between NSAIDs and Helicobacter pylori. Effective prophylaxis for NSAID ulcers in H. pylori-negative individuals continues to be a challenge, as it has become clear that conclusions from studies focusing on "endoscopic ulcers" in patients whose H. pylori status was unknown provided a false sense of security. The concept of multifocal atrophic gastritis has been challenged. The precursor lesion to gastric cancer now appears to be a sheet of pseudopyloric metaplasia advancing into the gastric body with islands of intestinal metaplasia embedded within it. Multifactorial models such as those proposed for understanding periodontal disease, including the organism, environmental factors, and host factors, appear particularly applicable to understanding the pathogenesis of H. pylori-associated gastric cancer.
    No preview · Article · Nov 2009 · Endoscopy
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    S Abudayyeh · J Hoffman · H.T. El-Zimaity · D.Y. Graham
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    ABSTRACT: Endoscopic biopsy forceps differ in the size and shape of the biopsy cup and the presence or absence of a needle. We compared four different "large cup" forceps (three with needles) designed for 2.8mm biopsy channels. A gastric antral and corpus biopsy were obtained with each. Parameters examined included: weight (mg), length (mm), orientation (poor, good), intactness (1, 2, or 3 pieces), depth (superficial, above muscularis mucosae, included muscularis mucosae), crush artefact (yes, no), and overall adequacy (inadequate, suboptimal, adequate). Twenty-four patients were enrolled (191 biopsies). The median length was approximately 5mm (range 1.1-8.2mm). Histologically inadequate specimens were present in 4% with the forceps without needle compared to 16% of those with needles (P=0.061) and there were significantly fewer specimens in three or more pieces than did the forceps with needles 2.1% vs. 12.6% (P<0.05). Current alligator style forceps provide a high proportion of acceptable specimens with only minor differences between brands. Forceps from one source were least preferred by endoscopy assistants and had the highest rates of inadequate biopsies and biopsies with crush artefact. Forceps without needles provide histologically acceptable samples slightly more frequently than those with needles.
    Full-text · Article · Oct 2008 · Digestive and Liver Disease
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    ABSTRACT: Atrophic gastritis (resulting mainly from long-standing Helicobacter pylori infection) is a major risk factor for (intestinal-type) gastric cancer development and the extent/topography of the atrophic changes significantly correlates with the degree of cancer risk. The current format for histology reporting in cases of gastritis fails to establish an immediate link between gastritis phenotype and risk of malignancy. The histology report consequently does not give clinical practitioners and gastroenterologists an explicit message of use in orienting an individual patient's clinical management. Building on current knowledge of the biology of gastritis and incorporating experience gained worldwide by applying the Sydney System for more than 15 years, an international group of pathologists (Operative Link for Gastritis Assessment) has proposed a system for reporting gastritis in terms of stage (the OLGA staging system). Gastritis staging arranges the histological phenotypes of gastritis along a scale of progressively increasing gastric cancer risk, from the lowest (stage 0) to the highest (stage IV). This tutorial aims to provide unequivocal information on how to consistently apply the OLGA staging system in routine diagnostic histology practice.
    Full-text · Article · Sep 2008 · Digestive and Liver Disease
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    D.Y. Graham · M Kato · M Asaka
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    ABSTRACT: The acceptance of the premise that Helicobacter pylori infection is aetiologically related to gastric cancer and peptic ulcer and that the risk of gastric cancer among Helicobacter pylori infected individuals is related to the extent, severity and duration of atrophic gastritis has led to major changes in medical and endoscopic practices. The development of non-invasive methods to detect Helicobacter pylori and to estimate the extent and severity of gastritis has reduced the need for diagnostic endoscopy in asymptomatic individuals. Here we provide recommendations regarding deciding whether non-invasive and endoscopic assessment of the gastric mucosa is preferred. We also include specific recommendations and caveats regarding the preferred biopsy number and sites as well as the identification of specimens, to allow the pathologist to reliable stage the severity and extent of gastritis, and thus provide prognostic information needed for patient managements (e.g., whether endoscopic surveillance is recommended). In summary, while there is clearly a role for gastric endoscopy and endoscopic biopsy in the Helicobacter pylori era, obtaining useful diagnostic and prognostic information is critically dependent upon attention to detail with regard to biopsy site and identification as to the location from where the specimen was taken.
    Full-text · Article · Aug 2008 · Digestive and Liver Disease
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    ABSTRACT: A number of theories regarding the aetiology of Crohn’s disease have been proposed. Diet, infections, other unidentified environmental factors and immune disregulation, all working under the influence of a genetic predisposition, have been viewed with suspicion. Many now believe that Crohn’s disease is a syndrome caused by several aetiologies. The two leading theories are the infectious and autoimmune theories. The leading infectious candidate is Mycobacterium avium subspecies paratuberculosis (Mycobacterium paratuberculosis), the causative agent of Johne’s disease, an inflammatory bowel disease in a variety of mammals including cattle, sheep, deer, bison, monkeys and chimpanzees. The evidence to support M. paratuberculosis infection as a cause of Crohn’s disease is mounting rapidly. Technical advances have allowed the identification and/or isolation of M. paratuberculosis from a significantly higher proportion of Crohn’s disease tissues than from controls. These methodologies include: (i) improved culture techniques; (ii) development of M. paratuberculosis-specific polymerase chain reaction assays; (iii) development of a novel in situ hybridization method; (iv) efficacy of macrolide and anti-mycobacterial drug therapies; and (v) discovery of Crohn’s disease-specific seroreactivity against two specific M. paratuberculosis recombinant antigens. The causal role for M. paratuberculosis in Crohn’s disease and correlation of infection with specific stratification(s) of the disorder need to be investigated. The data implicating Crohn’s as an autoimmune disorder may be viewed in a manner that supports the mycobacterial theory. The mycobacterial theory and the autoimmune theory are complementary; the first deals with the aetiology of the disorder, the second deals with its pathogenesis. Combined therapies directed against a mycobacterial aetiology and inflammation may be the optimal treatment of the disease.
    Full-text · Article · Jul 2008 · Alimentary Pharmacology & Therapeutics
  • M P Dore · D Y Graham
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    ABSTRACT: Peptic ulcer disease remains a common problem and it most frequently due to the presence of an Helicobacter pylori infection or use of non-steroidal anti-inflammatory drugs (NSAIDs). Dyspepsia is neither sensitive or specific for diagnosing peptic ulcer disease. The approach to patients with dyspepsia is to arrive at a definitive diagnosis without unnecessary exposure to invasive or costly diagnostic procedures. Non-invasive testing is preferred with endoscopy being reserved for those with alarm markers or above a specified age (e.g., 55 years in Western countries). Patients negative for H. pylori infection should receive an empiric trial of acid suppression for 4 to 8 weeks and if beneficial it can be continued.
    No preview · Article · Jul 2008 · Minerva medica
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    ABSTRACT: • Objectives: To characterize the course of children with recurrent abdominal pain (RAP) and to compare patient responses on a newly developed measure for RAP across the different diagnostic categories of RAP. • Methods: We enrolled children diagnosed with RAP during their first visit to the pediatric gastroenterology clinic at Texas Children's Hospital. At their initial visit, the eligible child/parent completed a multidimensional measure for RAP (MM-RAP) consisting of 4 scales (pain intensity scale, nonpain symptoms scale, disability scale, and satisfaction scale). The final diagnosis was defined as the diagnosis at their last visit. Diagnoses were classified as either functional RAP, organic RAP, or predominant gastroesophageal reflux disease (GERD) symptoms. The responses on the MM-RAP were analyzed by 1-way analysis of variance. • Results: 141 children aged 4 to 18 years (44% boys) participated. The mean follow-up period was 50 weeks. The final diagnoses were functional RAP in 46%, organic RAP in 24%, and GERD symptoms in 30%. Neither age nor sex predicted the outcome. The total scores for the pain intensity scale were significantly higher among children with functional RAP than organic RAP or GERD symptoms (19.7 ± 3.5 vs. 14.2 ± 4.7 and 13.1 ± 4.2, respectively; P = 0.001). Although the nonpain symptoms total score did not differ between the 3 outcome groups, independent items within the scale (ie, diarrhea, vomiting, and heartburn) were significantly higher among children with organic RAP and GERD symptoms compared with functional RAP. The scores for pain disability and health satisfaction scales were similar among the 3 groups. • Conclusions: The MM-RAP discriminated between functional and organic RAP across the studied population. Children with functional RAP report more intense pain than children with organic RAP or GERD symptoms.
    No preview · Article · Jun 2008 · Journal of clinical outcomes management: JCOM
  • S H Pang · W K Leung · D Y Graham

    No preview · Article · Mar 2008 · Endoscopy
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    ABSTRACT: Guidelines on the management of Helicobacter pylori, which cover indications for management and treatment strategies, were produced in 2000. To update the guidelines at the European Helicobacter Study Group (EHSG) Third Maastricht Consensus Conference, with emphasis on the potential of H pylori eradication for the prevention of gastric cancer. Eradication of H pylori infection is recommended in (a) patients with gastroduodenal diseases such as peptic ulcer disease and low grade gastric, mucosa associated lymphoid tissue (MALT) lymphoma; (b) patients with atrophic gastritis; (c) first degree relatives of patients with gastric cancer; (d) patients with unexplained iron deficiency anaemia; and (e) patients with chronic idiopathic thrombocytopenic purpura. Recurrent abdominal pain in children is not an indication for a "test and treat" strategy if other causes are excluded. Eradication of H pylori infection (a) does not cause gastro-oesophageal reflux disease (GORD) or exacerbate GORD, and (b) may prevent peptic ulcer in patients who are naïve users of non-steroidal anti-inflammatory drugs (NSAIDs). H pylori eradication is less effective than proton pump inhibitor (PPI) treatment in preventing ulcer recurrence in long term NSAID users. In primary care a test and treat strategy using a non-invasive test is recommended in adult patients with persistent dyspepsia under the age of 45. The urea breath test, stool antigen tests, and serological kits with a high accuracy are non-invasive tests which should be used for the diagnosis of H pylori infection. Triple therapy using a PPI with clarithromycin and amoxicillin or metronidazole given twice daily remains the recommended first choice treatment. Bismuth-containing quadruple therapy, if available, is also a first choice treatment option. Rescue treatment should be based on antimicrobial susceptibility. The global burden of gastric cancer is considerable but varies geographically. Eradication of H pylori infection has the potential to reduce the risk of gastric cancer development.
    Full-text · Article · Jul 2007 · Gut
  • D Y Graham

    No preview · Article · Mar 2007 · Alimentary Pharmacology & Therapeutics
  • D. Y. Graham

    No preview · Article · Jan 2007 · Alimentary Pharmacology & Therapeutics
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    ABSTRACT: The success rate of current anti-Helicobacter pylori triple therapies in now generally 80% or less. Sequential therapy has proved superior. To test a new sequential therapy for H. pylori eradication. This was a pilot study of a sequential therapy consisting of 40 mg of esomeprazole and 1 g amoxicillin t.d.s., for 12 days. On days 6 through 12 gatifloxacin (400 mg in the morning) was added. Outcome was accessed 4 or more weeks after ending antibiotic therapy. Both naive and treatment failures were eligible. Thirty patients were entered in the study. One was lost to follow-up and one stopped early because of side effects. The success rate intention-to-treat was 80% (95% CI: 61-92%). The per-protocol eradication rate was 85.7% (95% CI: 67-95%); two of the four failures had pre-treatment gatifloxacin-resistant H. pylori. Side effects were reported by 13 patients (46%) and were generally mild with diarrhoea being most common (n = 6). Only one patient stopped medicine because of side effects of dizziness (severe) and diarrhoea (mild). Sequential therapy using the combination of a high dose of proton-pump inhibitor and amoxicillin followed gatifloxacin was effective, but pre-treatment susceptibility testing may become necessary as fluoroquinolone resistance increases.
    Full-text · Article · Oct 2006 · Alimentary Pharmacology & Therapeutics
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    ABSTRACT: A number of Helicobacter pylori outer membrane proteins (OMPs) undergo phase variations. This study examined the relation between OMP phase variations and clinical outcome. Expression of H pylori BabA, BabB, SabA, and OipA proteins was determined by immunoblot. Multiple regression analysis was performed to determine the relation among OMP expression, clinical outcome, and mucosal histology. H pylori were cultured from 200 patients (80 with gastritis, 80 with duodenal ulcer (DU), and 40 with gastric cancer). The most reliable results were obtained using cultures from single colonies of low passage number. Stability of expression with passage varied with OipA > BabA > BabB > SabA. OipA positive status was significantly associated with the presence of DU and gastric cancer, high H pylori density, and severe neutrophil infiltration. SabA positive status was associated with gastric cancer, intestinal metaplasia, and corpus atrophy, and negatively associated with DU and neutrophil infiltration. The Sydney system underestimated the prevalence of intestinal metaplasia/atrophy compared with systems using proximal and distal corpus biopsies. SabA expression dramatically decreased following exposure of H pylori to pH 5.0 for two hours. SabA expression frequently switched on or off, suggesting that SabA expression can rapidly respond to changing conditions in the stomach or in different regions of the stomach. SabA positive status was inversely related to the ability of the stomach to secrete acid, suggesting that its expression may be regulated by changes in acid secretion and/or in antigens expressed by the atrophic mucosa.
    Full-text · Article · Jun 2006 · Gut
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    ABSTRACT: Antibiotic resistance and duration of therapy influence the success of proton-pump inhibitor-containing Helicobacter pylori eradication therapy. Clarithromycin resistance is associated with treatment failure. To examine the success of a 7-day rabeprazole-clarithromycin-amoxicillin therapy in the study population. Adults from Ciudad Juarez with H. pylori infections identified by culture or histology received rabeprazole 20 mg, clarithromycin 0.5 g and amoxicillin 1 g, each b.d. for 7 days. Outcome was assessed by 13C-urea breath test carried out 4+ weeks after treatment. A total of 111 patients were enrolled and evaluated by urea breath test; 102 completed the full 7 days therapy. Two deviated from protocol, and five stopped because of adverse events. The cure rate (intention-to-treat) was 85% (95% CI: 78-91%); the per-protocol cure rate was 85% (95% CI: 78-91%). Side-effects were not serious and only 6.6% of those with adverse events stopped medication. Only three isolates were clarithromycin-resistant and none was cured. Compliance explained most of the successes. In the study population a 7-day rabeprazole triple eradication therapy was both effective and well-tolerated. Clarithromycin resistance was uncommon. We observed a slightly better outcome but consistent with results from recent large studies in US populations.
    Full-text · Article · Feb 2006 · Alimentary Pharmacology & Therapeutics
  • W K Leung · F.K.L. Chan · DY Graham

    No preview · Article · Feb 2006 · Endoscopy

Publication Stats

25k Citations
3,484.11 Total Impact Points

Institutions

  • 1979-2013
    • Baylor College of Medicine
      • • Department of Medicine
      • • Veterans Affairs Medical Center
      • • Department of Molecular Virology & Microbiology
      Houston, Texas, United States
  • 1991-2006
    • Minneapolis Veterans Affairs Hospital
      Minneapolis, Minnesota, United States
    • University of Utah
      • School of Medicine
      Salt Lake City, Utah, United States
    • Arkansas Children's Hospital
      Little Rock, Arkansas, United States
  • 1992-2004
    • United States Department of Veterans Affairs
      Бедфорд, Massachusetts, United States
    • Cedars-Sinai Medical Center
      • Cedars Sinai Medical Center
      Los Ángeles, California, United States
  • 1997-2003
    • Università degli Studi di Sassari
      • Dipartimento di Scienze Biomediche
      Sassari, Sardinia, Italy
  • 2001
    • Shinshu University
      • Department of Laboratory Medicine
      Shonai, Nagano, Japan
  • 1982-2001
    • Spokane VA Medical Center
      Spokane, Washington, United States
  • 2000
    • Social Insurance Chukyo Hospital
      Nagoya, Aichi, Japan
  • 1999
    • Università degli Studi di Siena
      Siena, Tuscany, Italy
  • 1997-1999
    • Hospital San Juan de Dios Pamplona
      Quilichao, Cauca, Colombia
  • 1998
    • Technische Universität Dresden
      • Medical Clinic I
      Dresden, Saxony, Germany
    • The University of Calgary
      Calgary, Alberta, Canada
  • 1995
    • University of Texas Health Science Center at Houston
      Houston, Texas, United States
  • 1993
    • Methodist Dallas Medical Center
      Dallas, Texas, United States
    • IT University of Copenhagen
      København, Capital Region, Denmark
  • 1990
    • Baylor University
      Waco, Texas, United States
  • 1983-1990
    • Houston medical Center
      Ворнер Робинс, Georgia, United States
  • 1989
    • Case Western Reserve University
      Cleveland, Ohio, United States
  • 1986
    • Colorado State University
      • College of Veterinary Medicine and Biomedical Sciences
      Fort Collins, Colorado, United States