Nutr. Hosp. (2004) XIX (6) 325-332
ISSN 0212-1611 " CODEN NUHOEQ
S.V.R. 318
Original
Immunonutrition in clinical practice: what is the current evidence?
S. D. Heys, A. C. Schofield and K. W. J. Wahle
Department of Surgery. University of Aberdeen. Medical School. Foresterhill. Aberdeen and the Robert Gordon University.
Aberdeen. Scotland. AB25 2ZD, UK.
INMUNONUTRICIÓN
Abstract
EN LA PRÁCTICA CLÍNICA:
żCUÁL ES LA EVIDENCIA ACTUAL?
The clinical trials of immunonutrition that we have un-
dertaken have often been small, single centre studies.
They have often been of limited statistical power and ha-
Resumen
ve often included patients with a variety of underlying di-
sease states and at different points in the disease process.
Los ensayos clínicos sobre inmunonutrición que se
Three meta-analysis and a consensus statement in con-
han realizado han sido en general pequeÅ„os y unicéntri-
junction with a systematic review, have been performed
cos. Su poder estadístico se ha visto limitado y con fre-
in an attempt to overcome many of these limitations and
cuencia se han incluido pacientes con situaciones patoló-
understand further the clinical place for immunonutri-
gicas subyacentes mśltiples y en diferentes puntos del
tion. However, there are still many questions regarding
proceso de la enfermedad. Se han realizado tres meta-
the place of immunonutrition in clinical practice that we
análisis y una valoración de consenso, junto con una vi-
still do not understand or have definitive answers to.
sión sistemática en un intento de superar muchas de las
For example, do we really know what is the optimal
limitaciones y para entender mejor las situación clínica
combination of nutrients and in what quantities they
de la inmunonutrición. Sin embargo, hay todavía gran
should be provided? Do we understand any potential in-
nśmero de incógnitas en relación con el papel de la im-
teractions that might occur between these nutrients?
munonutrición en la práctica clínica, que todavía no en-
What is the effect of the patients nutritional state?
tendemos y para los que no tenemos contestaciones defi-
When and for how long should immunonutrition provi-
nitivas.
ded? What is the impact of the patients underlying di-
Por ejemplo, żconocemos en realidad cuál es la com-
sease process and how does this interact with the provi-
binación óptima de nutrientes y qué cantidades deben
sion of immunonutrition?
ser administradas? żEntendemos las interacciones po-
At the present time whilst there is some indication
tenciales que pudieran suceder entre estos nutrientes?
and evidence as to which patients might benefit most,
żCuál es el efecto sobre el estado nutritivo del paciente?
and as to those who may not benefit or even suffer detri-
żCuándo y durante cuánto tiempo debe ser administra-
mental effects from immunonutrition, we still can not
da inmunonutrición? żCuál es el impacto de la enferme-
answer these questions with any definitive authority. It
dad subyacente y cómo interactÅ›a ésta con la de immu-
is essential now that we undertake large well designed,
nonutrición?
well controlled multicentre studies with adequate statis-
En el momento actual, hay alguna indicación y evi-
tical power to answer these questions. The indications
dencia en relación con los pacientes que se benefician
are that immunonutrition has the potential to help pa-
más y en relación con cuales no se benefician o incluso
tients but its place must be more clearly defined before
puedan sufrir efectos detrimentales de la immunonutri-
its widespread acceptance into clinical practice is based
ción, pero aśn no podemos responder a estas preguntas
on sound scientific evidence.
con una autoridad definitiva. Es esencial que se lleven a
cabo estudios multicéntricos controlados, bien diseÅ„a-
(Nutr Hosp 2004, 19:325-332)
dos con poder estadístico adecuado para responder a es-
Key words: Clinical trials. Immunonutrition.
tas preguntas. La inmunonutrición tiene potencial para
ayudar a los pacientes pero su lugar deberá ser clarifi-
cado aÅ›n más antes de su aceptación universal en la
práctica clínica basada sobre una evidencia científica
Correspondence: Steven D Heys MD, PhD, FRCS (Eng, Glas, Ed)
Professor of Surgical Oncology. sólida.
Department of Surgery.
University of Aberdeen. (Nutr Hosp 2004, 19:325-332)
Medical School.
Palabras clave: Ensayos clínicos. Inmunonutrición.
Foresterhill.
E-mail: s.d.heys@abdn.ac.uk
Recibido: 2-VIII-2004.
Aceptado: 10-IX-2004.
325
Introduction acids such as arginine and glutamine, fatty acids, ribo-
nucleotides and certain trace elements. These indivi-
For the last 30 years, interest has focused on the ef-
dual nutrients have been discussed extensively elsew-
fects of loss of body weight in patients with a variety
here7-15 and will not be further discussed individually
of disease states, but particularly in those with severe
in this paper. Some of the key actions of these nu-
and critical illnesses. The impairments of immune
trients on the immune system are listed in table I.
function and organ function that occur in these pa-
It is not surprising that preliminary trials have been
tients who have lost body weight have been well re-
carried out to determine if any of these nutrients them-
cognised for many years1. The correlation between
selves can have clinically beneficial effects. However,
between loss of body weight and morbidity and mor-
at the present time, there is no evidence to support the
tality in patients undergoing surgery has also been
use of any of these as single nutrients in clinical prac-
well documented previously2, 3. Therefore, in view of
tice, perhaps with the exception of glutamine16. A re-
thes many randomised trials have been undertaken to
cent meta-analysis of 14 clinical trials of glutamine
determine what impact nutritional supplementation,
supplementation which has been given to critically ill,
given enterally or parenterally, might have on both the
or surgical patients, has suggested that there might
incidence of complications and mortality in patients
be beneficial effects. The results showed that patients
undergoing surgery or in those who have sustained a
receiving glutamine supplementation had a reduction
critical illness.
in their risks of developing an infectious complication
Although many studies have been undertaken, the
and in the group of surgical patients there was a sig-
results have often been difficult to interpret for va-
nificant reduction in the length of their hospital stay17.
rious reasons. For example, different patient popula-
The most interesting results, however, have come
tions, differing nutritional interventions and for varia-
from the clinical trials where combinations of these
ble periods of time in the pre-operative, post-operative
key nutrients have been combined together as com-
and perioperative periods, have all been studied. In tr-
mercially available immunonutritional regimens and
ying to understand the role of nutritional support more
which are for the enteral route. Most commonly, Im-
clearly meta-analyses and detailed analyses have been
pact® and Immunaid® have been evaluated. The key
undertaken in attempt to overcome some of these limi-
nutrients provided focused on arginine, glutamine, n-3
tations of the studies4-6. The most recent meta-analyses
essential fatty acids and ribonucleic acid, but in diffe-
have suggested that such an approach can reduce the
risk of post-operative complications in patients under-
going major surgery. However, any effect on morta-
Table I
lity has been more difficult to demonstrate and, in
Modulatory effects of key nutrients
fact, the evidence suggests that there is no reduction in
mortality, in contrast to that in morbidity4-6.
Arginine
It is important to remember that such approaches to
Increased responses of T cells to mitogenic stimulation
nutritional support have really focused on the provi-
and delayed type hypersensitivity responses
sion of nitrogen and calories, together with other es-
Increases in NK and LAK cell numbers
sential nutrients, to replace or supplement what it is Increases in circulating cytokine levels
expected to be a patient s normal oral intake, with or Increased nitric oxide production
without considering the additional metabolic demands Enhanced wound healing and collagen synthesis
Stimulates release of prolactin, insulin and glucagon
placed on the patient by their underlying illness. Ho-
wever, the recent developments in nutritional science
Glutamine
have allowed a more full appreciation and understan-
Increased responses of T cells to mitogenic stimulation
ding of the roles and function of a variety of nutrients.
Increased B lymphocyte differentiation and antibody pro-
This knowledge is not only what is necessary to main-
duction
tain health and organ function, but also what can hap-
Increased macrophage phagocytosis and neutrophil func-
pen if nutrients are given in amounts in excess of what
tion
was recognised previously as that being required for
Increased cytokine production
the maintenance of bodily function and homeostasis.
Maintenance of the intestinal mucosal barrier function
Certain key nutrients, if provided in excess of what
is their normal daily requirement will effect a modula- Fatty acids
tion of immune, inflammatory and metabolic path- Suppression of T cell proliferative responses to polyclo-
ways. The term nutritional pharmacology has been nal mitogens
used to describe this approach. When nutrients are Reductions in NK and LAK cell activity
Impaired cytokine production
used specifically to modulate the immune system, alt-
Decreased neutrophil and monocyte chemotactic respon-
hough this is clearly interlinked with inflammatory
ses and superoxide production
and metabolic pathways, it is termed immunonutri-
Alterations in cell membrane function and intracellular
tion 7, 8. Many nutrients will modify these processes
signalling
but in this regard, most interest has focussed on amino
326 Nutr. Hosp. (2004) 19 (6) 325-332 S. D. Heys y cols.
ring compositions and quantities in the different for-
Table III
mulations that are available (table II). The evidence
The effect of immunonutritional regimens on immune
base for the rationale of the composition of these im-
function in clinical trials
munonutritional regimens is unclear and the optimal
combination and quantities for each of the nutrients is Increased activation of T lymphocytes
debatable. Perhaps, the 30g per day of arginine has so- Increased Natural killer cells
Increases in Lymphocytes and percentage of T helper
me scientific basis in that a dose response study had
cells increased
indicated previously that this had a greater effect than
Polymorphonuclear phagocytosis enhanced
did lower doses18. However, as regards other nutrients,
Respiratory burst enhanced
the value of combinations when compared with single
Circulating levels of IgG and IgM, and interferon gamma
nutrients, the potential interactions between nutrients,
levels increased
and potential synergistic or antagonistic effects, there
is even less evidence for their use in their current way.
Despite these considerations regarding the role of
each individual nutrient, initial studies compared the
nal regimens in a variety of clinical settings. Most
effects of these combination of immunonutrients
commonly patients undergoing surgery for upper gas-
against readily available nutritional regimens which
trointestinal cancer, patients with sepsis and critical
were commonly used in clinical practice19, 20. Although
illness and patients who have sustained major burns,
the amounts of nitrogen and calories were usually
have been studied and the results from these trials ha-
comparable between the formulations, it was the com-
ve bee reported in detail previously20, 22-44.
position of specific nutrients that differed.
Although the patient groups that have been studied
These immunonutritional combinations did modu-
have differed, the end-points of these trials have been
late immune function in ways that would be expected
comparable. In terms of morbidity, a key outcome me-
to be beneficial. The provision of immunonutritional
asure has been the incidence of infectious complica-
regimens resulted in enhancements of a variety of im-
tions that occur in these patients. Also, other outcomes
mune functions, particularly lymphocyte responses to
that have been evaluated commonly in many of the
mitogenic stimulation, phenotypic analyses sugges-
trials, have included the effects on hospital stay, inten-
ting enhanced lymphocyte sub-set numbers and func-
sive care unit stay and patient mortality. Nevertheless,
tionally beneficial types of lymphocytes, in addition
interpretation of the results is difficult because of the
to increased levels of circulating antibodies19-22. These
many variable features in each of these trials, particu-
key effects reported from these studies are summari-
larly regarding patient type and immunonutritional
sed in table III. These results from these immunologi-
provision. For example, the underlying pathophysio-
cal studies were encouraging but the vital question re-
logical states, the baseline nutritional status, the type
garding immunonutrition for use in clinical practice
and quantity of immunonutrition provided and the ti-
must be whether or not these changes in immunologi-
ming of provision of immunonutrition are all impor-
cal parameters will translate into a better clinical out-
tant factors which have the potential to affect the re-
come for patients.
sults of each trial.
Clinical trials of immunonutrition in patients
Meta-analysis of clinical trials of immunonutrition
which have evaluated clinical outcomes
A series of randomised clinical trials have been un-
dertaken to evaluate the role of these immunonutritio-
In an attempt to further understand what effects
immunonutrition has on clincial outcome, three me-
ta-analyses45-47 and a more recent systematic review48
Table II
and consensus statement have been reported during
Nutrient composition of two immunonutrition regimens
the last five years. These analyses have examined
used in clinical trials
the published trials in some depth and try to draw
some conclusions that can be applied to clinical
Impact® Immun-Aid®
practice.
AID®
In 1999, the first meta-analysis reported the results
Volume (ml) 1,000 1,000
from 1,009 patients who had participated in eleven
Protein (g) 56 80
clinical trials45. The underlying pathological states that
Arginine (g) 12.5 14
these patients had were frequently different but the pa-
Glutamine (g) - 9
tients could be categorised as falling into two broad
Branched chain amino acids - 20
groups; those undergoing surgery for upper gastroin-
Nucleic acids (g) 1.23 1
testinal cancer and those patients who were critically
Fat (g) 27.8 22.0
ill for a variety of other reasons including trauma, sep-
N-3 EFA (%) 10.5 4.5
sis and major burns. Although there were differences
Selenium (ug) 46 100
in the methodological qulaity of the studies, three of
Immunonutrition in clinical practice: Nutr. Hosp. (2004) 19 (6) 325-332 327
what is the current evidence?
these 11 trials had a difference in the nutritional intake surgery or who were criticaly ill, which was defined
of the experimental and control groups of patients. as being cared for in a critical care environment .
There was an increased intake of nitrogen in the im- The immunonutrition given to patients had to include
munonutrition groups when compared with the con- at least two of the four most commonly used immuno-
trol groups and clearly this may have affected the out- enhancing nutrients (arginine, glutamine, n-3 fatty
comes of the trials. acids or nucleotides). There were also a large enough
Nevertheless, when these trials were analysed to- number of studies to be able to carry out subsequent
gether, there did appear to be clinical benefits in those sub-group analyses which compared the methodologi-
patients who received immunonutrition. In particular, cally better studies with the remainder, and also com-
immunonutrition was associated with a reduction in pared those trials where patients received immunonu-
the risks of developing an infectious complication (de- tritional regimens which had higher arginine contents
fined as intra-abdominal abscess, major wound infec- with the others who did not.
tion, septicaemia, pneumonia). The magnitude of this When considering the resuts of this analysis in terms
effect was substantial, with the relative risk being re- of all trials together and the effect on infectious com-
duced to 0.47 (95%CI 0.32-0.70) by the use of immu- plications, similar effects as noted before emerged47. In
nonutrition. A sub-group analysis also examined sepa- the 18 trials where inectious complications were repor-
rately at those patients with gastrointestinal cancer, ted, patients receiving immunonutition had less infec-
but not including those with critical illness. Again, tious complications (pneumonia, wound infections, in-
there was a significant reduction in infectious compli- tra-abdominal abscesses, urinary tract infection,
cations in patients receiving immunonutrition (relative intravenous line sepsis). Their relative risk of infec-
risk 0.47, 95%CI: 0.30-0.73). Another benefit to acrue tious complications was 0.66 (95% CI, 0.54 to 0.80).
in these patients from immunonutrition was that their Furthermore, the provision of immunonutrition was al-
length of stay in hospital was also reduced. Although so associated with a reduction in their length of stay in
this was only by 2.5 days (95% CI, -4.0 to -1.0 days), hospital by some 3 days (95% CI, -5.6 to 1.0 days)
nevertheless, there is a potential financial saving from the 17 trials where this was reported. As observed
which may also be important45. previously, when mortality was exmained there was no
Did the provision of immunonutrition have any ef- difference between those patients receiving immuno-
fect on mortality in these patients? Of the 11 studies, nutrition or those in the control groups (Relative risk
only seven of these reported effects on mortality. The 1.10, 95% CI, 0.93 to 1.31) (see table IV).
overall realative risk in patients receiving immunonu- An important sub-group analysis separated out and
trition was 1.77 (95% CI, 1.00 to 1.32)45 . Although examined those patients who had a critical illness and
this was higher in these patients it was not statistically then compared them with those who had undergone
significant. Furthermore, there were no deaths in eit- elective surgery. Here, a different picture emerged be-
her the experimental or control groups in four of the cause in the critically ill patients there was no reduc-
trials and only one showed a signficant difference, tion in infectious complications associated with the
with there being an increase in patients receiving im- provision of immunonutrition (RR, 0.96, 95% CI,
munonutrition. Closer examination of this latter study 0.77 to 1.20)47. In contrast, there was a significant re-
revealed that there had been a randomisation error duction in infectious complications in the elective sur-
with an increased number of patients with higher gical patients who were given immunonutrition (RR,
APACHE II scores in the immunonutrition group. It 0.53, CI, 0.42 to 0.68). Interestingly, in both groups of
should also be remembered that the patients in this patients there was a significant reduction in hospital
study were those with sepsis or a systemic inflamma- stay which was of comparable length between the two
tory response syndrome and the potential significance groups, but there was no effect on mortality in either
and importance of this with respect to immunonutri- type of patients47.
tion will be highlighted later. Perhaps the most interesting and thought-provo-
As reports of more trials of immunonutrition began king data to emerge from this meta-analysis was the
to appear in the literature it wasn t surprising that an
update of the first meta-analysis were published46. As
an interm step, Beale et al46 then included four more
Table IV
trials to give a total of 15 then available for statistical
Effects of immunonutrition on clinical outcome in all
analysis. The results were compared to those pre-
patients considered together
viously reported45 in that immunonutrition was asso-
ciated with a reduction in infectious complications by Number of trials 95% Confidence
evaluated Relative risk interval (CI)
approximately one half, but there was no significant
effect on mortality46.
Mortality effect 22 1.10 0.93 to 1.31
More importantly, by 2001, a total of 22 randomi-
Infectious complications 18 0.66 0.54 to 0.80
sed controlled trials of 2,419 patients were suitable for
Length of hospital stay effect 17 -3.3 days -5.6 to -1.0 days
another more detailed, examination47. The trials had
included patients who had either undergone elective
Taken from Heyland et al (47).
328 Nutr. Hosp. (2004) 19 (6) 325-332 S. D. Heys y cols.
effect of immunonutrition on mortality. As already pneumonia and bacteraemia. Furthermore, these pa-
discussed, there was no effect on mortality overall, tients also had reductions in their length of time in
or in the sub-groups of patients with critical illness hospital, length of stay in the intensive care unit and
or those in the elective surgery group. However, length of time for which they required mechanical
when the patients who had received immunonutritio- ventilation but there was no effect on mortality48.
nal formulations with higher arginine contents were These authors then attempted to answer five ques-
examined then a different picture emerged. The rela- tions which were thought to be of major importance
tive risk of mortality was 2.13 (95%CI, 1.08-4.21) in for clincial practice and with respect to certain catego-
patients receiving a higher arginine content type of ries and subgroups of patients categorised according
immunonutrition. In contrast, patients with lower ar- to their underlying pathology. Their findings and in-
ginine immunonutritional regimens had a relative terpretations are summarised below:
risk of death of 1.03 (95%CI, 0.75-1.41). Furthermo- In response to the question as to what effect of im-
re, this former group of patients also had a reduction munonutrition had on nosocomial infection in criti-
in risk of infections complications and a shorter hos- cally ill patients, then there was a reduction in patients
pital stay than did patients in the latter group (see ta- undergoing elective surgery (bacteraemias, intra-ab-
ble IV)47. dominal abscesses) but no effect on wound infection
The other major subgroup analysis which was of or nosocomial pneumonia. In addition, in patients who
those studies with the better methodological designs had sustained a major burn, there was a reduction in
and performance. Again, of some concern was that the the incidence of nosocomial pneumonia.
mortality analysis from these studies gave a relative The effect of immunonutrition in reducing hospital
risk of 1.46 (95%CI, 1.01-2.11). Whilst these results stay times was beneficial in the patients who were un-
are of some concern, it is important to remember that dergoing surgery and intensive care unit stay was also
they are from a subgroup analysis with all the atten- reduced in both patients who had undergone surgery
dent statistical limitations. Nevertheless, as discussed and those who had sustained a major trauma. The aut-
previously, it is important to consider the implications hors also concluded that there was no convincing ef-
of this further and this will be discussed later in this fect of immunonutrition on the incidence of multiple
paper. organ dysfunction or adult respiratory distress syndro-
me, and no effect on in-patient mortality. Finally, the-
re was no evidence to answer the question as to the ef-
Further understanding of the effect of the patients
fect of immunonutrition on reduction of the financial
underlying disease state on clinical outcomes
costs in patients with critical illness48.
In trying to take the understanding of the role and
potential for immunonutrition to affect the clinical
Importance of timing of the provision of
outcomes from the treatment of critically ill patients,
immunonutrition
most recent systematic review analysed the results
from 26 clinical trials of enteral immunonutrition48. An important consideration when examining these
However, the results from this analysis were then sub- clinical trials is what effect the timing of the provision
jected to review by a panel of experts. These experts immunonutrition might have on clinical outcome.
then considered the appropriateness of these results This might be extremely important in determining
for clinical practice and made recommendations for what clinical outcomes may occur in such patients.
the use of immunonutrition. The general overall re- Immunonutrition differs from conventional nutritional
sults from this analysis are shown In table V, but pa- support in that it is not just simply the provision of nu-
tients receiving immunonutrition had reductions in in- trients, nitrogen, calories etc., to patients who are eit-
fection rates, intra-abdominal abscesses, nosocomial her not able to take in nutrients normally or who are
Table V
Effect of immunonutrition in critically ill patients considered alone
Odds ratio 95% Confidence interval
Intra-abdominal abscesses 0.26 0.12-0.55
Nosocomial pneumonia 0.54 0.35-0.84
Bacteraemia 0.45 0.35-0.84
Mortality 1.10 0.85-1.42
Reduction in time on mechanical ventilation 2.25 days (mean) 0.5-3.9 days
Reduction in time in ICU stay 1.6 days (mean) 1.9-1.2 days
Reduction in hospital stay 3.4 days (mean) 4.0-2.7 days
Data from Montejo et al. (48).
Immunonutrition in clinical practice: Nutr. Hosp. (2004) 19 (6) 325-332 329
what is the current evidence?
malnourished. That is, immunonutrition is not desig- have an important clinical relevance in these patients
ned or intended to maintain normal metabolic pro- undergoing intestinal resections because of the ad-
cesses or to cause an anabolic response in a patients. It verse effects on the healing of gastrointestinal anas-
is conceptually and fundamentally a different appro- tomosis that occurs with inadequate oxygenation. In
ach to nutritional provision in the surgical or critically fact, there was almost a halving of the anastomotic
ill patient. Immunonutrition is a provision of nutrients leak rate in those patients who received peri-operati-
with the specific aim of modulating the immune, me- ve or pre-operative immunonutrition when compared
tabolic and inflammatory processes and it could be with the other patients (although this was not statisti-
considered, therefore, to be a pharmacological inter- cally significant)50.
vention.
This point regarding the potential importance of ti-
Is the provusion of immunonutrition appropriate
ming of the provision of immunonutrition has been
for all patients?
developed in key studies reported by Braga et al41 in
patients undergoing surgery for colorectal cancer. A The previously discussed data suggests that there
large, randomised, controlled study of such patients are clinical benefits to be gained by providing immu-
evaluated the clinical effects of immunonutrition (Im- nonutrition to patients undergoing elective surgery for
pact®) when it was given perioperatively, including gastrointestinal tract cancers. However, not all pa-
the pre- and post-operative periods. Overall, immuno- tients may benefit, particularly those with critical ill-
nutrition provision resulted in a reduction in post-ope- ness and there is also a concern that there may be a
rative complications and patients had a reduction in potential for harm in some patients51-53. In particular
their length of stay in hospital. These effects also had concern has focussed on the role and effects of of argi-
a tangible benefit in terms of a reduction in the finan- nine as a componant of immunonutrition. This is be-
cial costs of treatment associated with the provision of cause it was the studies using the immunonutritional
immunonutrition42, 49. regimens that patients had an increased mortality47. In
A post-hoc analysis was also carried out subse- trying to understand this further, perhaps the precursor
quently to determine if there was any affect on outco- role of arginine for nitric oxide (NO) synthesis via the
me which could be attributed to the timing of the pro- nitric oxide synthase (NOS) enzyme system provides
vision of the immunonutritional intervention. a reason as to why there may be some concern. During
Interestingly, this indicated that the provision of nu- inflammatory conditions there is an increased produc-
trients pre-operatively was probably as good as admi- tion of NO via the inducible (iNOS) enzyme system.
nistration in the whole of the peri-operative period in One of the key effects of NO is to cause a vasodilata-
terms of effects on clinical outcomes. Clearly, sub- tion, which can be substantial, and indeed has be
group analyses do have limitations in the validity of shown to be of therapeutic benefit in patients with hy-
the conclusions that can be drawn from them, but they pertension, claudication and coronary artery disea-
do allow the generation of a hypothesis for future tes- se54, 55.
ting. Is it possible that this resultant vasodilatation might
To answer this question definitively as to whether have harmful effects in patients who are critically ill?
immunonutrition given in the pre-operative period is It is certainly a possibility because experimental clini-
as effective as that given in both the pre- and post- cal studies has shown that an intravenous bolus injec-
operative patients, Braga et al50 undertook another lar- tion of arginine can have marked effects in patients
ge clinical trial. This study was designed not only to with sepsis56. This bolus administration of arginine ef-
look at clinical outcomes but also to examine carefully fected a large reduction in the patients mean blood
what effects there were on basic physiological func- pressure with concomitant reductions in systemic and
tions. More than 200 patients with colorectal cancer pulmonary vascular resistances, together with an in-
undergoing surgical resection were randomised to one creased cardiac index. However, within ten minutes of
of four experimental groups; this was either (i) to re- the arginine bolus having been given, these effects
ceive pre-operative immunonutrition for 5 days, (ii) had reversed and returned to the pre-treatment indices
pre-operative immunonutrition but then continued for for the patients56.
5 days post-operatively (jejunal infusion), (iii) oral in- There are also other effects of arginine which could
take of a standard isonitrogenous, isocaloric formula be potentially harmful to critically ill patients. For
for 5 days period to surgery, and (iv) a group of pa- example, NO can affect cellular oxygen consumption
tients who were treated conventionally with no sup- and utilisation, possibly by inhibiting the mitochon-
plementation before or after surgery. drial enzymes that are key to the process of electron
It was demonstrated in this study that those pa- transfer57. In the clinical situation there is evidence to
tients receiving immunonutrition in either the pre- support this possibility. The partial pressure of oxygen
operative period and the peri-operative period, had in skeletal muscle has been shown to increase with in-
improved immunological functions, better gut oxy- creasing severity of sepsis in critically ill patients
genation and microperfusion than did the patients which is in proportion to the severity of sepsis which
who were not receiving immunonutrition50. This may patients are experiencing58. Whilst this is important
330 Nutr. Hosp. (2004) 19 (6) 325-332 S. D. Heys y cols.
circumstantial evidence for a block in oxygen utilisa- changes are different. Indeed, in those patients in
tion, in animal studies there is more direct evidence. whom there is immunosuppression then immune en-
Reduced levels of the cytochrome c enzyme systems hancement is appropriate. In contrast, in those patients
have been documented in an animal model of sepsis59 in an inflammatory phase, immunonutrition with im-
and furthermore, this reduction was proportional to munoinhibitory nutrients may be theoretically more
the degree of the sepsis and septic shock59. appropriate. This needs to be considered further and in
NO is also important in the critically ill patient be- much detail if we are to understand further these po-
cause it is essential in the physiological situation for tential benefits of immunonutrition.
the maintenance of the gut-mucosal barrier and for en-
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