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Vitamin B12 (Cobalamin) Deficiency in Elderly Patients

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Vitamin B12 (Cobalamin) Deficiency in Elderly Patients Review Synthèse Vitamin B12 (cobalamin) deficiency in elderly patients Emmanuel Andrès, Noureddine H. Loukili, Esther Noel, Georges Kaltenbach, Maher Ben Abdelgheni, Anne E. Perrin, Marie Noblet-Dick, Frédéric Maloisel, Jean-Louis Schlienger, Jean-Frédéric Blicklé Abstract and these should be excluded as causes of cobalamin defi- ciency before a diagnosis is made. To obtain cutoff points VITAMIN B12 OR COBALAMIN DEFICIENCY occurs frequently (> 20%) of cobalamin serum levels, patients with known complica- among elderly people, but it is often unrecognized because the tions are compared with age-matched control patients clinical manifestations are subtle; they are also potentially serious, without complications. Because different patient popula- particularly from a neuropsychiatric and hematological perspec- tions have been studied, several serum concentration defin- tive. Causes of the deficiency include, most frequently, food- itions have emerged.5–7 Varying test sensitivities and speci- cobalamin malabsorption syndrome (> 60% of all cases), perni- ficities result from the lack of a precise “gold standard.” cious anemia (15%–20% of all cases), insufficent dietary intake The definitions of cobalamin deficiency used in this review and malabsorption. Food-cobalamin malabsorption, which has are shown in Box 1. Based in part on the work of Klee7 and only recently been identified as a significant cause of cobalamin in part on our own work,8 they are calculated for elderly pa- deficiency among elderly people, is characterized by the inability to release cobalamin from food or a deficiency of intestinal cobal- tients. The first definition is simpler to interpret, but it re- amin transport proteins or both. We review the epidemiology and quires that blood samples be drawn on 2 separate days. causes of cobalamin deficiency in elderly people, with an empha- New serum cobalamin (holotranscobalamin) assay kits sis on food-cobalamin malabsorption syndrome. We also review have replaced older assay kits in most countries and should 9 diagnostic and management strategies for cobalamin deficiency. become the standard for testing. CMAJ 2004;171(3):251-9 Epidemiology itamin B12 or cobalamin deficiency occurs fre- Epidemiological studies show a prevalence of cobalamin quently among elderly patients,1 but it is often deficiency of around 20% (between 5% and 60%, depend- V unrecognized or not investigated because the ing on the definition of cobalamin deficiency used in the clinical manifestations are subtle. However, the potential study) in the general population of industrialized countries. seriousness of the complications (particularly neuropsy- The Framingham study demonstrated a prevalence of 12% chiatric and hematological)1–4 requires investigation of all among elderly people living in the community.10 Other patients who present with vitamin or nutritional defi- studies focusing on elderly people, particularly those who ciency. We summarize the current state of knowledge on are in institutions or who are sick, have suggested a higher cobalamin deficiency, with a particular focus on defi- prevalence: 30%–40%.11,12 However, these figures are ques- ciency in elderly people. tionable since they depend directly on normality thresholds In gathering information for this article, we systemati- cally searched PubMed for articles published from 1990 to July 2003 (the search strategy is outlined in online Appen- dix 1 [www.cmaj.ca/cgi/content/full/171/3/xxx/DC1]). We Box 1: Definitions of cobalamin have also included unpublished data from our working (vitamin B12) deficiency in elderly people group, the Groupe d'étude des carences en vitamine B12 • Serum cobalamin level < 150 pmol/L on des Hôpitaux Universitaires de Strasbourg. 2 separate occasions Defining cobalamin deficiency OR • Serum cobalamin level < 150 pmol/L AND Cobalamin deficiency is defined in terms of the serum total serum homocysteine level > 13 µmol/L values of cobalamin and of homocysteine and methyl- OR methymalonic acid > 0.4 µmol/L (in the malonic acid, 2 components of the cobalamin metabolic absence of renal failure and folate and vitamin B deficiencies) pathway. High homocysteine levels (hyperhomocysteine- 6 DOI:10.1503/cmaj.1031155 mia) may also be caused by folate or vitamin B6 deficiencies, CMAJ • AUG. 3, 2004; 171 (3) 251 © 2004 Canadian Medical Association or its licensors Andrès et al 1 Salivary Dietary cobalamin Dietary R-protein bound to animal Salivary glands protein intake Gastric Dietary secretion deficiency Nitrous oxide* Achlorhydria resulting in inability HCl to sever the animal Pepsin protein from the Cbl–R-protein cobalamin complexes secreted in bile Gall (5–10 µg/d) bladder 2 R-protein from parietal cells Exocrine failure leads to cobalamin Lack of IF with total malabsorption (inability gastrectomy or pernicious to degrade Cbl–R-protein Intrinsic anemia (idiopathic atrophy complexes) Pancreatic factor protease of gastric mucosa in 3 association with antibodies Jejunum Ileal mucosal cell to parietal cells and IF) 4 High concentration of bacteria and certain parasites in small intestine 5 can absorb cobalamin Cubilin 6 Resection or disease of the distal 80 cm Adenosyl- of the ileum Distal 80 cm of ileum cobalamin Genetic disorders involving plasma transport Methyl- cobalamin Genetic disorders involving conversion Cobalamin transported via portal system to coenzyme forms bound to transcobalamin I, II and III Christine Kenney 252 JAMC • 3 AOÛT 2004; 171 (3) Cobalamin deficiency in elderly patients Fig. 1: Cobalamin metabolism and corresponding causes of selected by the authors. Using the definitions shown in Box deficiency. Causes of cobalamin deficiency are shown in blue. 1, we found a prevalence of greater than 4.8% in a large The metabolic pathway starts when (1) dietary cobalamin (Cbl), group of patients in hospital between the ages of 65 and 98 obtained through animal foods, enters the stomach bound to (data submitted to the 47th Congress of the French Na- animal proteins (P). (2) Pepsin and hydrochloric acid (HCl) in tional Society for Internal Medicine in Bordeaux, June the stomach sever the animal protein, releasing free cobalamin. 11–13, 1998). Most of the free cobalamin is then bound to R-protein (R), which is released from the parietal and salivary cells. Intrinsic Cobalamin metabolism and function factor (IF) is also secreted in the stomach, but its binding to cobalamin is weak in the presence of gastric and salivary R- protein. (3) In the duodenum, dietary cobalamin bound to R- Cobalamin metabolism is complex and requires many protein is joined by cobalamin–R-protein complexes that have processes, any one of which, if not present, may lead to 4,13–15 been secreted in the bile. Pancreatic enzymes degrade both cobalamin deficiency. The causes of cobalamin defi- biliary and dietary cobalamin–R-protein complexes, releasing ciency are shown in Fig. 1 and listed in Table 1. free cobalamin. (4) The cobalamin then binds with intrinsic Once metabolized, cobalamin is a cofactor and co- factor. The cobalamin–intrinsic factor complex remains undis- enzyme in many biochemical reactions, including DNA turbed until the distal 80 cm of the ileum, where (5) it attaches synthesis, methionine synthesis from homocysteine and to mucosal cell receptors (cubilin) and the cobalamin is bound conversion of propionyl into succinyl coenzyme A from to transport proteins known as transcobalamin I, II and III (TCI, methylmalonate, as shown in Fig. 2. TCII and TCIII). Transcobalamin II, although it represents only a A typical Western diet contributes 3–30 µg of cobalamin small fraction (about 10%) of the transcobalamins, is the most per day toward the estimated daily requirement of 2–5 µg important because it is able to deliver cobalamin to all cells in that is recommended by the American Society of Geri- the body. The cobalamin is subsequently transported systemi- atry,16 the US Food and Drug Administration and the As- cally via the portal system. (6) Within each cell, the transcobal- sociation Française de Sécurité Sanitaire des Aliments. amin II–cobalamin complex is taken up by means of endocyto- Reserves, which are primarily hepatic, are significant (> sis and the cobalamin is liberated and then converted 1.5 mg). The 5- to 10-year delay between the onset of in- enzymatically into its 2 coenzyme forms, methylcobalamin sufficient intake and the development of clinical illness is a and adenosylcobalamin (this process is shown in greater detail direct result of the hepatic stores and the enterohepatic cy- in Fig. 2). cle, whereby cobalamin is excreted in bile and then reab- *Nitrous oxide, a general anesthetic, causes multiple defects in 4,13 cobalamin use, most of which are intracellular and clinically sorbed in the small intestine (see Fig. 1). Between 1% relevant only in people who have low or borderline-low serum and 5% of free cobalamin (and crystalline cobalamin) is cobalamin levels. absorbed along the entire intestine by passive diffusion, which explains the mechanism underlying oral treatment of deficiencies associated with pernicious anemia and food- cobalamin malabsorption.4,17,18 In a clinical setting, cobalamin absorption is examined (imperfectly) by the Schilling test.4,8 The test is currently Table 1: Stages of cobalamin metabolism and corresponding performed as follows: patients are given 1000 µg of cyano- causes of cobalamin deficiency13,15 cobalamin intramuscularly at day 1 to saturate the intestinal 58 Stage of cobalamin metabolism Cause of cobalamin deficiency
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