Vitamins that may be helpful
Vitamin A plays an important role in wound healing,23 and one animal study
suggests that vitamin A deficiency might contribute to poor recovery after
surgery.24 Vitamin A may be particularly beneficial to post-surgical patients who
are using corticosteroid medications. These
medications typically slow wound healing, and a number of animal studies have found that both
topical and oral vitamin A reverse this effect; however, vitamin A does not change healing
time in animals not given corticosteroids.25 26 27 Similar
results have been reported for topical vitamin A in some human cases, and these researchers
suggest a topical preparation containing 200,000 IU of vitamin A per ounce for improved
surgical wound healing in patients using corticosteroids after surgery.28 Topical
vitamin A may also reduce scarring in patients taking corticosteroids.29
Selenium is a mineral nutrient with an
important role in immune function and infection prevention,30 31
32 and selenium deficiency has been reported in patients after intestinal
surgery.33 A controlled trial of critically ill patients, including some with
recent major surgery, found that those receiving daily intravenous selenium injections for
three weeks showed less biochemical signs of body stress compared with unsupplemented
patients. The amount used in this trial was 500 mcg twice daily for the first week, 500 mcg
once daily for the second week, and 100 mcg three times daily for the third
week.34
Zinc is another mineral nutrient important
for proper immune system function and wound healing.35 One study found most surgery
patients recovering at home had low dietary intakes of zinc.36 Low blood levels of
zinc have been reported in patients after lung surgery.37 38 In one
study this deficiency lasted for up to seven days after surgery and was associated with higher
risk of pneumonia,39 while another study found an association between
post-operative zinc deficiency and fatigue.40 Poor post-operative wound healing is
also more common in people with zinc deficiency.41 Zinc supplements given to
patients before surgery prevented zinc deficiency in one study, but the effect of these
supplements on post-surgical health was not evaluated.42
Alpha-ketoglutarate (AKG) is used by cells
during growth and in healing from injuries and other wounds,43 and is especially important in
the healing of muscle tissue.44 Controlled studies have found intravenous AKG
helpful for supporting protein synthesis, which often declines as a result of surgery, and for
protecting the heart muscle from damage during heart surgery,45 but no research has
investigated whether oral AKG would be similarly effective.
One preliminary study found iron levels to
be reduced after both minor and major surgeries, and iron supplementation prior to surgery was
not able to prevent this reduction.46 A controlled trial found that intravenous
iron was more effective than oral iron for restoring normal iron levels after spinal surgery
in children.47 One animal study reported that supplementation with fructo-oligosaccharides (FOS) improved the absorption
of iron and prevented anemia after
surgery,48 but no human trials have been done to confirm this finding. Some
researchers speculate that iron deficiency after a trauma such as surgery is an important
mechanism for avoiding infection, and they suggest that iron supplements should not be given
after surgery.49
Patients who have undergone major surgery frequently need blood transfusions to replace
blood lost during the procedure. Studies have found that 18 to 21% of surgery patients were
anemic prior to surgery,50 51 and these anemic patients required more
blood after surgery than did non-anemic surgery patients. Supplementation with iron prior to
surgery was found in a controlled trial to reduce the need for blood transfusions, whether or
not iron deficiency was present.52
Iron supplements (99 mg per day) given before and for two months after joint surgery in
another controlled trial improved blood values but did not change the length of
hospitalization or the risk of post-operative fever.53 Pre-operative iron
supplementation in combination with a medication that stimulates red blood cell production in
the bone marrow is considered by some doctors to be an effective way to minimize the need for
post-operative blood transfusions.54
Vitamin C deficiency can be detrimental to
immune function in hospitalized
patients,55 and one study found that half of surgery patients recovering at home
had low dietary intakes of vitamin C.56 Vitamin C is also a critical nutrient for
wound healing,57 58 but
studies of vitamin C supplementation have shown only minor effects on the healing of surgical
wounds.59 60 Vitamin C deficiency also can increase the risk of
excessive bleeding in the surgical setting.61
Some studies of surgery patients,62 63 though not all, 64
have found that blood levels of vitamin E
decrease during and after surgery. Animal research suggests that vitamin E may prevent skin
scarring when used topically after surgery,65 but a human study reported
disappointing results.66 Vitamin E taken by mouth may interfere with blood
clotting67 ; therefore, use of vitamin E before surgery should be discussed with
the surgeon. No research on either the usefulness or hazards of vitamin E supplementation
around surgery has been done.
Vitamin B1, given as intramuscular
injections of 120 mg daily for several days before surgery, resulted in less reduction of
immune system activity after surgery in a preliminary trial.68 In a controlled
trial, an oral B vitamin combination providing 100 mg of B1, 200 mg of vitamin B6, and 200 mcg of vitamin B12 daily given for five weeks before surgery
and for two weeks following surgery also prevented post-surgical reductions in immune
activity.69 However, no research has explored any other benefits of B vitamin
supplementation in surgery patients.
Glutamine, one of the most abundant amino acids in the body, supports the health of
the cells lining the gastrointestinal tract and is important for immune function.70
Glutamine is depleted when the body is under stress, including the stress of
surgery.71 Blood levels of glutamine decrease following surgery, and as they return
to normal, their increase parallels the increase in immune cells.72 Two controlled
trials have shown that the use of glutamine-enriched intravenous formulas, providing
approximately 20 grams of glutamine per day, resulted in increased immune cell activity and
shorter hospital stays.73 74 Double-blind studies report that patients
receiving intravenous formulas supplemented with glutamine after surgery had better
nutritional status and better health outcomes, including fewer infections and other
complications, compared with patients receiving regular formulas.75
76
The amino acid arginine has a role in
immune function, infection prevention, and
tissue repair after injury, including surgery.77 Animal research suggests that
supplemental arginine may improve the outcomes in cardiovascular78 and colon
surgeries.79 Other animal studies suggest a possible role for arginine in
prevention of adhesions, a painful type of internal scarring that can occur with
surgery.80 Human trials of formulas including arginine are discussed below, but the
benefits of supplemental arginine alone have not been studied in surgery patients.
Taurine is an amino acid abundantly present
in the body that also appears to have an important role in immune cell functions.81
A preliminary trial found that patients receiving an oral formula enriched with taurine (1
gram per liter) beginning two days before surgery and continuing until five days after surgery
had less inflammation after surgery compared with those receiving a standard
formula.82
Omega-3 fatty acids have anti-inflammatory
properties,83 and animal studies suggest that supplementation with omega-3 fatty
acids may improve recovery and prevent infection after surgery.84 85 A
controlled human trial found that intravenous nutritional formulas containing omega-3 fatty
acids given post-operatively lowered the production of inflammatory chemicals compared with
standard nutritional formulas.86 Other human studies of omega-3 fatty
acid-supplemented nutritional formulas used in surgery patients have included other
supplemental nutrients as well and are discussed below.87
Ribonucleic acid (RNA) is a member of the nucleotide family of biomolecules and supports
protein synthesis and cell growth. During times of physical stress, RNA helps stimulate immune
cell division and activity,88 89 and is needed in greater amounts.
Animal studies show that nucleotides given in the diet support the immune response and
decrease death rates in infected animals.90 91 92 In human
infants, those fed nucleotide-enriched formulas have healthier gastrointestinal systems and
better immune function than do those fed ordinary formulas.93 94
95 RNA is included in some oral and intravenous nutritional formulas used for surgery
patients, and these formulas are discussed below.
Research on post-surgical recovery has explored the usefulness of liquid nutritional
formulas supplemented with several nutrients believed to improve immune function and to speed
the healing process. The most common of these supplemental nutrients are certain amino acids,
essential fatty acids, and nucleotides.96 Several controlled trials, some of which
were double-blind, showed that giving an oral formula containing arginine, RNA, and omega-3 fatty acids from fish oil either after surgery97
98 or before and after surgery99 100 101 102
resulted in decreased inflammation, less reduction of immune cell function, fewer
complications of surgery, and shorter hospital stays. The formula most commonly used in these
studies contains 12.5 grams of arginine, 3.3 grams of omega-3 fatty acids, and 1.2 grams of
RNA per liter, as well as additional iron, zinc, selenium,
copper, and vitamin C. Typically, 1 to 1.5
liters per day was consumed by the surgery patients. One controlled trial, however, found that
this enriched formula was no better than a standard formula when they were given only before
surgery.103 An analysis of 12 studies comparing traditional formulas with
immune-enhancing formulas concluded that surgery patients receiving the supplemented formulas
had the same risk of death, but that they had fewer infections and shorter hospital
stays.104
Are there any side effects or interactions?
Refer to the individual supplement for information about any side effects or interactions.
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