title: Prevalence and outcome of anemia after restorative proctocolectomy: a clinical literature review.
abstract: OBJECTIVE
  Iron and/or vitamin B12 deficiency anemias, which have adverse effects on patients' quality of life, are commonly observed and often overlooked complications after restorative proctocolectomy. We performed a systematic review of publications on the prevalence of anemia as well as on the impact of anemia on a range of clinical, functional, quality of life, and economic outcomes in restorative proctocolectomy patients. This information is important to help healthcare providers through a comprehensive overview to increase awareness about a condition that could require therapy to improve patient healthcare and quality of life.
  
  
  METHODS
  We reviewed the English language publications on the incidence of anemia and its adverse effect after restorative proctocolectomy The United States National Library of Medicine database (MEDLINE), the Excerpta Medica database (EMBASE), the Cochran Library, and the Google search engine were searched for published articles on the prevalence and impact of anemia in post-restorative proctocolectomy surgical patients.
  
  
  RESULTS
  The long-term complication most frequently described after RPC is pouchitis. Pouchitis is significantly associated with iron deficiency anemia caused by pouch mucosal bleeding. Other causes are insufficient and/or impaired iron absorption. It has also been observed, however, that restorative proctocolectomy patients with underlying familial adenomatous polyposis rarely develop pouchitis yet show higher rates of iron deficiency anemia compared to those patients with underlying ulcerative colitis. Other causes shown as independent risk factors for iron deficiency anemia in restorative proctocolectomy patients are malignancy, desmoid tumors, and J-pouch configuration. Vitamin B12 deficiency anemia is also common after restorative proctocolectomy. About one-third of restorative proctocolectomy patients show abnormal Schilling test and 5 percent have low referenced serum cobalamin. It has been observed that the degree resection of the terminal-ileum, malabsorption, bacterial overgrowth, and dietary factors are among the known causes of cobalamin deficiency. Folate deficiency has not been reported in restorative proctocolectomy patients. Describing restorative proctocolectomy surgery and its outcomes, in patients without anemia, the quality of life is reported excellent regardless of operative technique.
  
  
  CONCLUSIONS
  Anemia is not uncommon following restorative proctocolectomy and has been shown to have negative effects on the patient's quality of life and the economy and may substantially increase healthcare costs. The treatment of anemia and its underlying causes is important to improving clinical and economic outcomes.
authors.affiliation: Department of General Surgery, Vanderbilt University Medical Center, Nashville, Tennessee 37232-2543, USA. Amosy.e.mkoma@vanderbilt.edu
authors.forename: Amosy E
authors.initials: AE
authors.lastname: M'Koma
authors.forename: Paul E
authors.initials: PE
authors.lastname: Wise
authors.forename: David A
authors.initials: DA
authors.lastname: Schwartz
authors.forename: Roberta L
authors.initials: RL
authors.lastname: Muldoon
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Herline
mesh_terms: D018798:Anemia, Iron-Deficiency / Q000453:epidemiology*; D003093:Colitis, Ulcerative / Q000601:surgery; D005494:Folic Acid Deficiency / Q000150:complications / Q000453:epidemiology; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D011183:Postoperative Complications / Q000453:epidemiology*; D019449:Pouchitis / Q000150:complications; D015995:Prevalence; D016737:Proctocolectomy, Restorative / Q000009:adverse effects; D011788:Quality of Life; D012307:Risk Factors; D014168:Transferrin / Q000032:analysis; D014806:Vitamin B 12 Deficiency / Q000453:epidemiology
chemical_list: D006454:Hemoglobins; D014168:Transferrin