Vitamin Deficiency in the Elderly by Zoe Salgado Family Medicine Residency Program.
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Transcript of Vitamin Deficiency in the Elderly by Zoe Salgado Family Medicine Residency Program.
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Vitamin Deficiency in the Elderly
by Zoe SalgadoFamily Medicine Residency Program
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Vitamins
Definition: Chemically unrelated organic
compounds that are essential for normal metabolism
Cannot be synthesized, therefore must be ingested
Different from minerals (Ca, Fe) or food supplements (Herbs)
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Vitamins Vitamin A, D, E, K Vitamin C and the
B vitamins B1-Thiamine Riboflavin B3-Niacin Pantothenic acid Biotin B6-pyridoxine B12 folate
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Vitamin deficiency
Gross deficiencies are recognized by clinical syndromes
Are seen in poorer areas Seen in Western societies in special
populations Elderly, vegans, new immigrants, the
very poor, alcoholism, malabsorption (hx gastric bypass), parenteral nutrition
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Daily values
Daily values=DV, prior known as RDA established by the National Research
Council and National Academy of Sciences may not be sufficient for chronic disease normal values in general are uncertain many people have suboptimal levels
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Question Can optimizing vitamin intake prevent
chronic disease? some biochemical abnormalities can improve
with intake, then reach a plateau causing no further improvement >>suggests a correctable metabolic disease Eg:
1.homocysteine levels increase as folic acid decreases
2. Methylmalonic acid levels increases with low B12
3. PTH rises with low Vitamin D
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Overview Vitamin D---DV 400IU Vitamin B12—DV 6 mcg Folic Acid---400mcg
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Vitamin A First fat soluble vitamin to be discovered Part of compounds called retinoids Essential for vision, immune response,
epithelial growth and repair Can store 1 year of reserve RBP=retinol binding protein-bonds to
Vitamin A in blood
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Requirements Males > 10 yo need 1000mcg Females > 10yo need 800 mcg only 40-60% plant bioavailability vs
80-90% of animal protein Zinc and/or Iron deficiency can
interfere with metabolism LABS
-RBP, CBC, serum retinol(costly)
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Vitamin A deficiency Complications
Dry skin, dry hair, broken nails-may be first sign
Night blindness Xeropthalmia-no tears-predisposes to
blindness Hyperkeratosis-goose bump skin
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Vitamin K(VK) Found in green, leafy vegetables
and oils Plays a role in coagulation cascade Body’s reserve lasts one week 85% absorbed in terminal ileum
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Vitamin K deficiency Def due to
chronic illness, multiple abdominal surgeries, liver or biliary disease, alcoholism, drugs: Abics(cephalos) Coumadin, salicylates, sulfa
Clinical Manifestations Bleeding, hematoma, ecchymosis
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Vitamin K deficiency Labs:
Pt/Ptt Vit K level (0.2-1 ng/ml)
RX Replace Vit K IM( 10 mg/d) , SQ, or PO
(5-20 mg) FFP( begin- 2 Units)
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Vitamin D Few foods contain Vit D (fatty fish
and eggs) Dermal synthesis or fortified foods
(milk) are the main source Two forms of Vitamin D-
Ergocalciferol -Vit D2 Cholecalciferol-Vit D3
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Vitamin D Metabolsim Vitamin D3 is synthesized in the skin
during UV light exposure Vit D3 from skin or diet is then
hydroxylated in the liver, then kidneys to active form Vit D dihydrohycholecalciferol (calcitriol)
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Vitamin D Deficiency Causes
Decreased sun exposureIn Boston and Edmonton Vit D cutaneous production ceases in winter (1)
Low dietary intake/absorption• Half of elderly women take in less than 65 units/day• Achlorydia-common in elderly, decreases vitamin
absorption• NOT common in IBD (including Chron's) per AGA
guidelines
1-Tangpricha, 2002
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Prevalence
MSK pain (unrecognized !!!!!!) Hospitalized pts Women being treated for OP CKD (usually 1,25DOH but also 25OHD GI malabsorption Gastric bypass Cystic fibrosis Extensive burns
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Vitamin D deficiency Independent predictors
Low Vitamin D intake Winter Housebound status
Who should be tested? Institutionalized or home bound Suspected malabsorption Evaluation of osteoporosis
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Vitamin D Deficiency and Bone health Osteoporosis
Postmenopausal women with low 25 OHD levels have lower bone densities (3)
Falls Meta analysis of 5 RCT with 1237 older patients, Vit D
use reduced falls by 22% compared to Calcium or placebo (4)
One RCT of nursing home residents found 50% fall reduction over 5 months with Vit D 800 IU BUT not at lower doses(5)
• 3-Villareal, 1991, 4-Bischoff-Ferrari, 2004, 5-Broe, 2007
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Vitamin D deficiency and cancer High levels of Vitamin D may decrease
cancer risk One 4year RCT compared Ca(1400-
1500mg) alone, Ca + Vit D (1100IU/d) or placebo in 1179 women > 55yo (2) Results: both Ca and Ca/Vit D appear to
decrease the risk of incident cancer ( after 1 year RR 0.23, 95% CI)
Other RCT using different doses of Vit D have not found risk reduction
• 2-Lappe,2007
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Vitamin D serum levels Test to order: serum 25 OH Vit D
(calcidiol) Normal cluster 30-32 ng/ml(75-
80mmol/L) “levels of 28-40 may lower the
fracture risk” No consensus on optimal 25OH
concentration for skeletal health
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Vitamin D serum levels Different definitions of deficiency Option #1
Vit D Insufficiency= 20-30ng/ml Vit D Deficiency=< 20 ng/ml
Option #2 Vit D deficiency 9-28 Severe deficiency 8 or less
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Optimal intake 1997 national academy of sciences
recommendation: 400IU/d age 51-70 600 IU/d age > 71 However more recent data shows avg
adult needs 800-1000IU/d to maintain level of 30
Older persons confined indoors may have low levels even at this intake
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Vitamin D levels in NHCU Total patients in NHCU=85 # of patients tested 23 Moderate deficiency= 16 Severe deficiency (levels at 8 or less)=3 Normal=4 82% of those tested had moderate
deficiency, 13% had severe deficiency
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25 OHD LEVELS OVER TIME IN NHCU
25 OHD LEVELS TESTED IN 23 PATIENTS March 2008
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Vitamin D in NHCU
Of those tested: Dx of falls=3…..(all had moderate
deficiency) Dx of fx= 5…..(4 had deficiency, one
with severe deficiency) Dx MSK pain=4.….(3 with moderate
deficiency, 1 with severe) Dx of OP=2…..(1 with deficiency, 1
normal)
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NHCU Vitamin D Data 1 1 patient with no MSK hx at all had
Vit D level of 6 The highest Vit D level of 61, pt had
hx of osteopenia # of patients with continued current
deficiency =14, of those only 7 were being treated
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Current Recommendations
Do NOT screen (Grade 2C), but give supplementation below(Grade 2B)
Daily 800 IU at least and 1.2 g of elemental calcium
Lower intake-not as effective Higher intake( safe upper limit
2000IU/day)-hypercalcemia DO NOT recommend switching from daily
800IU to high dose intermittent (100,000 units q 4 months) unless pt is noncompliant
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Vitamin D supplementation For every 40 IU of D3 given, serum 25-
OH D increased by 0.3-0.4 ng/ml Rx for deficiency
PO: 50,000 units of D3 q week x 6-8 weeks, then 800-1000 IU daily
IM : D3 (300,000 IU) in 1 or 2 doses per year Rx for Insufficiency
800-1000 IU of D3 daily( will bring avg adult to serum level of 30 in 3 months)
Measure serum levels after 3 months of starting rx
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Vitamin B12 Deficiency causes:
Neurologic disease Megaloblastic anemia, pernicious anemia May be important cause of
hyperhomocysteinemia (CV disease, OP) Subtle deficiency even without anemia
may cause dementia and ?balance problems
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TABLE 1 Clinical Manifestations of Vitamin B12 Deficiency
Hematologic Megaloblastic anemia Pancytopenia (leukopenia, thrombocytopenia) Neurologic Paresthesias Peripheral neuropathy Combined systems disease (demyelination of dorsal columns and corticospinal tract) Psychiatric Irritability, personality change Mild memory impairment, dementia Depression Psychosis Cardiovascular Possible increased risk of myocardial infarction and stroke
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Suboptimal B-12 deficiency
Caused by poor absorption and inadequate intake
Malabsorption-cobalamin unable to release from dietary proteins esp with low gastric acid secretions
Alcoholism
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B12 level
Normal-> 300 pg/ml cobalamin deficiency unlikely
Borderline 200-300-deficiency possible
Low < 200 -deficiency
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B 12 deficiency Pts with low normal or even normal
B12 levels may be deficient Homocysteine (HC) and
methylmalonic acid(MMA) levels will be high with deficiency
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B12 deficiency
If deficiency measured by methylmalonic acid levels rising with low intake and falling with supplementation, there may be deficiency with even normal levels
One study showed 82% deficiency in 282 elderly patients
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Monitoring B 12 deficiency If folate> 4 ng/ml and cobalamin
>300pg/ml, deficiencies unlikely, no further testing
If either of above levels are low, check methylmalonic acid and total homocysteine levels If both normal>no deficiency If both are high>clear B12 deficiency If MMA is normal and HC is high, folate
deficiency (sens 86%, spec99%)
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B12 LEVELS IN NHCU
TOTAL PATIENTS=85 TOTAL TESTED=73 DEFICIENCY=0 BORDERLINE=7 NORMAL/HIGH=66
OF 73 TESTED PATIENTS, 66 HAD NEUROPSYCHIATRIC DIAGNOSIS
9% PATIENTS TESTED HAD BORDERLINE DEFICIENCY
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B 12 LEVELS OVER TIME NHCU
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Recommendations for B12 supplementation Older adults - 6mcg daily Vitamin supplements have 100 mcg/dose May be inadequate dose in:
Elderly Atrophic gastritis Vegans Gastric bypass sx Alcoholics Poor dietary intake
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Dosing of B12 Few studies to guide dosing If pernicious Anemia dose of IM B12 is 100
-2000mcg/day (no toxicity at higher doses)
One RCT suggests dosing at higher than 50mcg/day may be needed to normalize B12 (no known toxicity at this level)
In high risk pts-recommendation to have periodic monitoring of either methylmalonic acid or B12 level
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Folic acid Found in green leafy vegetables,
fruits, cereals, nuts, mats Folic acid (the supplement form) has
same effect but more bioavailable than folate
Deficiency leads to megaloblastic anemia
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Folic Acid in Pregnancy Decreases risk of neural tube defect
Appears dose dependent - In one study
400 mcg decreased rate of NTD by 57%5000mcg decreased rate by 85%
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Folic acid in Cardiovascular Disease Elevated homocysteine associated
with increased risk of CV disease Folic acid, B6, B12 can decrease
homocysteine However RCTs of supplementations
for secondary prevention do NOT support a beneficial effect of vitamins in CV disease
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Folic acid and cancer A functional polymorphism in MTHFR(major
enzyme in folate metabolism) linked to colorectal cancer, >>Folate may protect DNA against damage during cell division
One RCT -1 g of folic acid vs placebo in 1021 pts with
colorectal adenoma found no difference in the risk of new adenoma at 3 years RR 1.04, 95%CI but found high risk of advanced lesions at 3 years
At 6 years f/o with colonscopy 607 pts results were repeated
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Recommendations for folate supplementation Do NOT take folic acid for reducing
cancer risk Evidence unclear and limited
regarding association between hypertension and hearing loss
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Toxicity Water soluble vitamins
toxic at thousands x the DV Vitamin C-increased risk of kidney stones-
controversial Fat soluble vitamins
Vit D- hypercalcemia at dose of 2000IU/d Vitamin A –pregnancy-teratogenic Vitamin E- above 400 IU may be associated
with all cause mortality
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Toxicity Vitamin A -HA, dizziness, blurred vision,
clumsiness, birth defects, Vitamin D-Constipation, weakness, anorexia,
weight loss, confusion B3-Niacin-Flushing, redness of skin, B6-pyridoxine-Numbness, paresthesia, ataxia Vitamin C-kidney stones Folate-can mask B12 deficiency
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1. Tangpricha, V et al, Am J Med 2002, June 1:112(8)659-62
2.Lappe,LM, et al, Am J Clin Nut, Jun 85(6) 1586-91
3. Villareal, Dt,et al, J Clin Endocrinol Metab, 991, Mar ;72 (3) : 628-34
4.Bischoff-Ferrari, Ha, et al, JAMA, 2004, April 28;291(16):1999-2006
5. Broe, KE, et al, J Am Geriatr Soc 2007 Feb;55(2)234-9