title: The course of Helicobacter pylori infection in kidney transplantation patients.
abstract: BACKGROUND
  Helicobacter pylori has been found to be only a minor risk factor for gastroduodenal complications in kidney transplantation patients. The aim of the study was to follow up the course of H. pylori infection in a group of immunosuppressed kidney transplantation patients.
  
  
  METHODS
  After a median follow-up of 6.8 years, control serum samples were taken from 93 originally seropositive and 88 originally seronegative kidney transplant recipients. H. pylori antibodies of the IgG and IgA classes and serum pepsinogen I levels were measured from pretransplant and follow-up samples in parallel. In addition, CagA antibodies were measured from the baseline samples of the seropositive patients.
  
  
  RESULTS
  83 of the 93 seropositive patients were also cagA-positive. In addition to the 10 patients who received H. pylori eradication therapy, 27 (29%) of the 92 patients with originally elevated H. pylori IgG antibody titres showed IgG titres at normal level or levels decreased by more than 70% and below 2000 (regarded as seroreverters) after the follow-up. One of the originally seronegative patients seroconverted during the study period. After transplantation, the decrease of serum pepsinogen I values was in accordance with improved kidney function. Patients with lower serum pepsinogen I levels before the transplantation seroreverted more easily.
  
  
  CONCLUSIONS
  A spontaneous H. pylori seroreversion occurred in 29% of the immunosuppressed kidney transplantation patients. After a successful kidney transplantation, serum pepsinogen I values declined significantly.
authors.affiliation: Transplantation and Liver Surgery, Helsinki University Hospital, Helsinki, Finland.
authors.forename: S
authors.initials: S
authors.lastname: Sarkio
authors.forename: H
authors.initials: H
authors.lastname: Rautelin
authors.forename: L
authors.initials: L
authors.lastname: Halme
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000897:Anti-Ulcer Agents / Q000627:therapeutic use; D000907:Antibodies, Bacterial / Q000097:blood; D001944:Breath Tests; D005260:Female; D005500:Follow-Up Studies; D006085:Graft Survival / Q000187:drug effects; D016481:Helicobacter Infections / Q000188:drug therapy / Q000209:etiology* / Q000276:immunology; D016480:Helicobacter pylori / Q000276:immunology / Q000302:isolation & purification*; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D007166:Immunosuppressive Agents / Q000627:therapeutic use; D016030:Kidney Transplantation / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D020116:Pepsinogen A / Q000097:blood
chemical_list: D000897:Anti-Ulcer Agents; D000907:Antibodies, Bacterial; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007166:Immunosuppressive Agents; D020116:Pepsinogen A