iatrogenic malnutrition in the icu: time for a change!
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Iatrogenic Malnutrition in the ICU: Time for a Change!. Daren K. Heyland Professor of Medicine Queen’s University, Kingston General Hospital Kingston, ON Canada. Learning Objectives. Define iatrogenic malnutrition - PowerPoint PPT PresentationTRANSCRIPT
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Learning Objectives• Define iatrogenic malnutrition• Describe the nature of the evidence related
to optimal amount of calories/protein• List key variables to consider in assessing
nutritional risk in ICU patients• List strategies to improve nutritional
adequacy in the critical care setting.
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A different form of malnutrition?
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Health Care Associated Malnutrition
Nutrition deficiencies associated with physiological derangement and organ
dysfunction that occurs in a health care facility
Patients who will benefit the most from nutrition therapy and who will be harmed the most from
by iatrogenic malnutrition (underfeeding)
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Optimal Amount of Protein and Calories for Critically Ill
Patients?
Early EN (within 24-48 hrs of admission) is recommended!
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Increasing Calorie Debt Associated with worse Outcomes
Caloric debt associated with: Longer ICU stay
Days on mechanical ventilation Complications
Mortality
Adequacy of EN
Rubinson CCM 2004; Villet Clin Nutr 2005; Dvir Clin Nutr 2006; Petros Clin Nutr 2006
0200400600800
100012001400160018002000
1 3 5 7 9 11 13 15 17 19 21
Days
kcal
Prescribed Engergy
Energy Received From Enteral Feed
Caloric Debt
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• Point prevalence survey of nutrition practices in ICU’s around the world conducted Jan. 27, 2007
• Enrolled 2772 patients from 158 ICU’s over 5 continents
• Included ventilated adult patients who remained in ICU >72 hours
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Effect of Increasing Amounts of Calories from EN on Infectious
Complications
Heyland Clinical Nutrition 2010
Multicenter observational study of 207 patients >72 hrs in ICU followed prospectively for development of infection
for increase of 1000 cal/day, OR of infection at 28 days
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Relationship between increased nutrition intake and physical function (as defined by SF-36 scores)
following critical illness
Unpublished data from Multicenter RCT of glutamine and antioxidants (REDOXS Study); n=364
for increase of 30 gram/day, OR of infection at 28 days
Model *
Estimate (CI) P values
At 3 months
PHYSICAL FUNCTIONING 3.2 (-1.0, 7.3) P=0.14
ROLE PHYSICAL 4.2 (-0.0, 8.5) P=0.05
STANDARDIZED PHYSICAL COMPONENT SCALE 1.8 (0.3, 3.4) P=0.02
At 6 months
PHYSICAL FUNCTIONING 0.8 (-3.6, 5.1) P=0.73
ROLE PHYSICAL 2.0 (-2.5, 6.5) P=0.38
STANDARDIZED PHYSICAL COMPONENT SCALE 0.70 (-1.0, 2.4) P=0.41
For every 1000 kcal/day received:
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Faisy BJN 2009;101:1079
Mechancially Vent’d patients >7days (average ICU LOS 28 days)
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• 113 select ICU patients with sepsis or burns
• On average, receiving 1900 kcal/day and 84 grams of protein
• No significant relationship with energy intake but……
Clinical Nutrition 2012
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More (and Earlier) is Better!
If you feed them (better!)They will leave (sooner!)
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Optimal Amount of Calories for Critically Ill Patients:
Depends on how you slice the cake!
• Objective: To examine the relationship between the amount of calories recieved and mortality using various sample restriction and statistical adjustment techniques and demonstrate the influence of the analytic approach on the results.
• Design: Prospective, multi-institutional audit• Setting: 352 Intensive Care Units (ICUs) from 33
countries. • Patients: 7,872 mechanically ventilated, critically ill
patients who remained in ICU for at least 96 hours.
Heyland Crit Care Med 2011
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Association between 12 day average caloric adequacy and 60 day hospital mortality
(Comparing patients rec’d >2/3 to those who rec’d <1/3)A. In ICU for at least 96 hours. Days after permanent progression to exclusive oral feeding are included as zero calories*
B. In ICU for at least 96 hours. Days after permanent progression to exclusive oral feeding are excluded from average adequacy calculation.*
C. In ICU for at least 4 days before permanent progression to exclusive oral feeding. Days after permanent progression to exclusive oral feeding are excluded from average adequacy calculation.*
D. In ICU at least 12 days prior to permanent progression to exclusive oral feeding*
*Adjusted for evaluable days and covariates,covariates include region (Canada, Australia and New Zealand, USA, Europe and South Africa, Latin America, Asia), admission category (medical, surgical), APACHE II score, age, gender and BMI.
0.4 0.6 0.8 1.0 1.2 1.4 1.6
UnadjustedAdjusted
Odds ratios with 95% confidence intervals
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Association Between 12-day Caloric Adequacy and 60-Day Hospital
Mortality
Heyland CCM 2011
Optimal amount= 80-85%
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More (and Earlier) is Better!
If you feed them (better!)They will leave (sooner!)
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Rice et al. JAMA 2012;307
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Rice et al. JAMA 2012;307
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Rice et al. JAMA 2012;307
Enrolled 12% of patients screened
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Trophic vs. Full enteral feeding in critically ill patients with acute respiratory failure
• Average age 52• Few comorbidities• Average BMI 29-30• All fed within 24 hrs (benefits of early EN)• Average duration of study intervention 5 days
No effect in young, healthy, overweight patients who
have short stays!
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Nutritional Management of ICU Patients: Are these both the same?
• Low Risk– 34 year former football
player,– BMI 35– otherwise healthy– involved in motor
vehicle accident– Mild head injury and
fractured R leg requiring ORIF
• High Risk– 72 women– BMI 35– PMHx COPD, poor
functional status– Admitted to hospital 1
week ago with CAP– Now presents in respiratory
failure requiring intubation and ICU admission
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ICU-acquired Weakness (ICUAW)
Muscle weakness develops in 25%-60% of patients who have been mechanically ventilated for > 1 week1
Prolongs:1-4 – mechanical ventilation– weaning from the ventilator– ICU stay
• ICUAW main clinical manifestation of critical illness neuromyopathy (CINM)5
1. de Jonghe B, et al. Crit Care Med. 2004;30:1117-1121.2. Garnacho-Montero J, et al. Crit Care Med. 2005;33:349-354.3. van den Berghe G, et al. Crit Care Med. 2003;31:359-366.4. Hermans G, et al. Am J Respir Crit Care Med. 2007;175:480-489.5. de Jonghe B, et al. Crit Care Med. 2009;37(suppl.):S309-S315.
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Determinants to Lean Body Mass
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Muscle Matters!Skeletal muscle mass predicts ventilator-free days, ICU-
free days, and mortality in elderly ICU patients
• Patients > 65 years with an admission abdominal computed tomography scan and requiring intensive care unit stay at a Level I trauma center in 2009-2010 were reviewed.
• Muscle cross-sectional area at the 3rd lumbar vertebra was calculated and sarcopenia identified using sex-specific cut-points.
• Muscle cross-sectional area was then related to clinical parameters including ventilator-free days, ICU-free days, and mortality.
Kozar (in submission)
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Skeletal Muscle
Adipose Tissue
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Physical Characteristics of Patients
• N=149 patients• Median age: 79 years old• 57% males• ISS: 19• Prevalence of sarcopenia: 71%
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BMI CharacteristicsAll Patients Sarcopenic
Patients (n=106)Non-sarcopenic Patients (n=43)
BMI (kg/m2) 25.8 (22.7, 28.2) 24.4 (21.7, 27.3) 27.6 (25.5, 30.4)
Underweight, % 7 9 2
Normal Weight, % 37 44 19
Overweight, % 42 38 51
Obese, % 15 9 28
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Low muscle mass associated with mortality
Proportion of Deceased Patients
P-value
Sarcopenic patients 32%0.018
Non-sarcopenic patients 14%
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Muscle mass is associated with ventilator-free and ICU-free
daysAll Patients Sarcopenic
PatientsNon-
Sarcopenic Patients
P-value
Ventilator-free days
25 (0,28) 19 (0,28) 27 (18,28) 0.004
ICU-free days 19 (0,25) 16 (0,24) 23 (14,27) 0.002
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Am J Respir CCM 2008;178:261-268
• Prospective multicenter observational trial of 136 patients requiring min 5 days of mechanical ventilation• After day 5, when awake, performed muscle testing
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PROTEIN REQUIREMENT IN CRITICAL ILLNESSAT ADEQUATE ENERGY INTAKE
Wolfe et al., Ann Surg 1983; Ishibashi et al., Crit Care Med 1998Hoffer Am J Clin Nutr 2003
-2
-1.5
-1
-0.5
0
Who
le-b
ody
prot
ein
loss
(kg
/ 2 w
eeks
)
g protein / kg IBW per day
0.7 1.0 1.5 2.2
PROTEIN REQUIREMENT IN CRITICAL ILLNESSAT ADEQUATE ENERGY INTAKE
Wolfe et al., Ann Surg 1983; Ishibashi et al., Crit Care Med 1998Hoffer Am J Clin Nutr 2003
-2
-1.5
-1
-0.5
0
Who
le-b
ody
prot
ein
loss
(kg
/ 2 w
eeks
)
g protein / kg IBW per day
0.7 1.0 1.5 2.2
-2
-1.5
-1
-0.5
0
Who
le-b
ody
prot
ein
loss
(kg
/ 2 w
eeks
)
g protein / kg IBW per day
0.7 1.0 1.5 2.2
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ICU patients are not all created equal…should we expect the impact of nutrition
therapy to be the same across all patients?
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How do we figure out who will benefit the most from Nutrition
Therapy?
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Health Care Associated Malnutrition
Do Nutrition Screening tools help us discriminate those ICU patients that will benefit the most from artificial nutrition?
Patients who will benefit the most from nutrition therapy and who will be harmed the most from
by iatrogenic malnutrition (underfeeding)
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All ICU patients treated the same
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Albumin: a marker of malnutrition?
• Low levels very prevalent in critically ill patients• Negative acute-phase reactant such that synthesis,
breakdown, and leakage out of the vascular compartment with edema are influenced by cytokine-mediated inflammatory responses
• Proxy for severity of underlying disease (inflammation) not malnutrition
• Pre-albumin shorter half life but same limitation
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Subjective Global Assessment?
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• When training provided in advance, can produce reliable estimates of malnutrition
• Note rates of missing data
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• mostly medical patients; not all ICU• rate of missing data?• no difference between well-nourished and malnourished patients with regard to the serum protein values on admission, LOS, and mortality rate.
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Mostly surgical patients; 100% data available for SGA
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“We must develop and validatediagnostic criteria for appropriate
assignment of thedescribed malnutrition syndromes
to individual patients.”
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Nutrition Statusmicronutrient levels - immune markers - muscle mass
Starvation
Acute-Reduced po intake
-pre ICU hospital stay
Chronic-Recent weight loss
-BMI?
InflammationAcute
-IL-6-CRP-PCT
Chronic-Comorbid illness
A Conceptual Model for Nutrition Risk Assessment in the Critically Ill
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The Development of the NUTrition Risk in the Critically ill Score (NUTRIC
Score). Variable Range PointsAge <50 0
50-<75 1>=75 2
APACHE II <15 015-<20 120-28 2>=28 3
SOFA <6 06-<10 1>=10 2
# Comorbidities 0-1 02+ 1
Days from hospital to ICU admit 0-<1 01+ 1
IL6 0-<400 0400+ 1
AUC 0.783Gen R-Squared 0.169Gen Max-rescaled R-Squared 0.256
BMI, CRP, PCT, weight loss, and oral intake were excluded because they were not significantly associated with mortality or their inclusion did not improve the fit of the final model.
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The Validation of the NUTrition Risk in the Critically ill Score (NUTRIC Score).
0 1 2 3 4 5 6 7 8 9 10
Nutrition Risk Score
Mor
talit
y R
ate
(%)
020
4060
80
ObservedModel-based
n=12 n=33 n=55 n=75 n=90 n=114 n=82 n=72 n=46 n=17 n=2
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The Validation of the NUTrition Risk in the Critically ill Score (NUTRIC Score).
0 1 2 3 4 5 6 7 8 9 10
Nutrition Risk Score
Day
s on
Mec
hani
cal V
entil
ator
02
46
810
1214 Observed
Model-based
n=12 n=33 n=55 n=75 n=90 n=114 n=82 n=72 n=46 n=17 n=2
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The Validation of the NUTrition Risk in the Critically ill Score (NUTRIC Score).
0 50 100 150
0.0
0.2
0.4
0.6
0.8
1.0
Nutrition Adequacy Levles (%)
28 D
ay M
orta
lity
11 111
1
111
22
2
22 2
22
2
33
333
33
3
3
333 3
3
33
33
444444
44444
444
44 4444
44
4
44
4 444 4 444
4
4
55 5555 5 55 5 5 5 5 5
5 55 5 55 55
5 5555 55 555 55 55
5 555 555
66 66 6666666
6 66
666
6 666 66 6
6
66
66
6 6
666
6 666
67
77
77
7
7
7
7
7
7
7
7
7
77
7
7
77
7
7
7 7
7
88
8
8
8
8
8
8
88
88
8
88
8
8
88
8
8
8
99
9
9
9
9
9
9
9
1010
Interaction between NUTRIC Score and nutritional adequacy (n=211)*
P value for the interaction=0.01
Heyland Critical Care 2011, 15:R28
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• Multicenter prospective study of nutrition practice in abdominal surgery
• All patients had nutrition screening, not all patients had peri op nutrition support
• Benefit of nutrition support seen in NRS>5 compared to controls, no benefit seen in low risk patients (NRS<5).
P=0.008 P=0.04 P=0.04
Patients with NRS >5
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Who might benefit the most from nutrition therapy in the ICU?
• High NUTRIC Score?• Clinical
– BMI– Projected long length of stay
• Others?
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Do we have a problem?
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Preliminary Results of INS 2011
Overall Performance: Kcals
84%56%
15%
N=211
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Nutritional Adequacy of
High Risk Patients
compared to Low Risk
Patients
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Failure Rate
Unpublished observations. Results of 2011 International Nutrition Survey (INS).
75.6 78.1
91.2
75.1
87.0
69.8
79.9
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Strategies to Maximize the Benefits and Minimize the Risks
of EN
• feeding protocols• motility agents• elevation of HOB• small bowel feeds
weak evidence
stronger evidence
Canadian CPGs www.criticalcarenutrition.com
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Use of Nurse-directed Feeding Protocols
Start feeds at 25 ml/hr
Check Residuals
q4h
> 250 ml•hold feeds
•add motility agent
•reassess q 4h
< 250 ml•advance rate by 25 ml
•reassess q 4h
2009 Canadian CPGs www.criticalcarenutrition.com
“Should be considered as a strategy to optimize delivery of enteral nutrition in critically ill adult patients.”
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The Impact of Enteral Feeding Protocols on Enteral Nutrition Delivery:
Results of a multicenter observational study
• Time to start EN from ICU admission 41.2 in protocolized sites vs 57.1 hours in those without a protocol
• Patients rec’ing motility agents 61.3% in protocolized sites vs 49.0% in those without
Heyland JPEN 2010
0
20
40
60
80
Calories from EN Total Calories
ProtocolNo Protocol
P<0.05
P<0.05
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Can we do better?
The same thinking that got you into this mess won’t get you out of it!
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• Different feeding options based on hemodynamic stability and suitability for high volume intragastric feeds.
• In select patients, we start the EN immediately at goal rate, not at 25 ml/hr.
• We target a 24 hour volume of EN rather than an hourly rate and provide the nurse with the latitude to increase the hourly rate to make up the 24 hour volume.
• Start with a semi elemental solution, progress to polymeric• Tolerate higher GRV threshold (300 ml or more)• Motility agents and protein supplements are started
immediately• Nurse reports daily on nutritional adequacy.
The Efficacy of Enhanced Protein-Energy Provision via the Enteral Route in Critically Ill Patients:
The PEP uP Protocol!
A Major Paradigm Shift in How we Feed Enterally
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The Efficacy of Enhanced Protein-Energy Provision via the Enteral Route in Critically Ill Patients:
The PEP uP Protocol!
Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7 TotalP-value 0.08 0.0003 0.10 0.19 0.48 0.18 0.11 <0.0001
Adequacy of Calories from EN (Before Group vs. After Group on Full Volume Feeds)
Heyland Crit Care 2010
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Change of nutritional intake from baseline to follow-up of all the study sites (intervention group only)
% calories received/prescribed
% c
alor
ies
rece
ived
/pre
scrib
ed
1 2 3 4 5 6 7 8 9 10 12
010
2030
4050
6070
8090
100
n ITTn Efficacyn FVFn E@Base
24311357260
21911357236
19411357
209
17110854175
15310552
152
1389646
136
1188340113
1077535102
83592690
76522380
59401771
52351462
ITTEfficacyFull volume feedsBaseline intervention
% p
rote
in re
ceiv
ed/p
resc
ribed
1 2 3 4 5 6 7 8 9 10 12
010
2030
4050
6070
8090
100
n ITTn Eff icacyn FVFn E@Base
24311357260
21911357236
19411357
209
17110854175
15310552152
1389646136
1188340113
1077535
102
83592690
76522380
59401771
52351462
ITTEfficacyFull volume feedsBaseline intervention
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What if you can’t provide adequate nutrition enterally?
… to add PN or not to add PN,that is the question!
Health Care Associated Malnutrition
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Early vs. Late Parenteral Nutrition in Critically ill Adults
• 4620 critically ill patients• Randomized to early PN
– Rec’d 20% glucose 20 ml/hr then PN on day 3
• OR late PN– D5W IV then PN on day
8• All patients standard EN
plus ‘tight’ glycemic control
Cesaer NEJM 2011
• Results:Late PN associated with
• 6.3% likelihood of early discharge alive from ICU and hospital
• Shorter ICU length of stay (3 vs 4 days)
• Fewer infections (22.8 vs 26.2 %)
• No mortality difference
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Early vs. Late Parenteral Nutrition in Critically ill Adults
• ? Applicability of data– No one give so much IV glucose in first few days– No one practice tight glycemic control
• Right patient population?– Majority (90%) surgical patients (mostly cardiac-60%)– Short stay in ICU (3-4 days)– Low mortality (8% ICU, 11% hospital)– >70% normal to slightly overweight
• Not an indictment of PN– Early group only rec’d PN for 1-2 days on average– Late group –only ¼ rec’d any PN
Cesaer NEJM 2011
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Lancet Dec 2012
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Lancet Dec 2012
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Lancet Dec 2012
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Doig, ANZICS, JAMA May 2013
Adult patients were eligible for enrollment within 24 hours of ICU admission if they were expected to
remain in the ICU on the calendar day after enrollment, were considered ineligible for enteral nutrition by the attending clinician due to a short-
term relative contraindication and were not expected to PN or oral nutrition
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Who were these patients?
Overall, standard care group
remained unfed for 2.8 days after randomization
40% of standard care group never rec’d any artificial
nutrition; remained in ICU 3.5 days
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Intervention not intense enough?
• 40% of both groups got EN (delayed)• 40% of standard care group got PN for an
average of 3.0 days• Average PN use in early PN group was 6.0 days
•
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Doig, ANZICS, JAMA May 2013
Main inference: No harm by early PN (in contrast to EPaNIC)
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What if you can’t provide adequate nutrition enterally?
… to TPN or not to TPN,that is the question!
•Case by case decision•Maximize EN delivery
prior to initiating PN•Use early in high risk
cases
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Yes
YESAt 72 hrs
>80% of Goal Calories?
No
NO
No problem
Anticipated Long Stay?
Yes No
Maximize EN with motility agents and small bowel feeding
No
YESTolerating
EN at 96 hrs? Yes
NO
Start PEP UP within 24-48 hrs
High Risk?
Carry on!
Supplemental PN? No problem
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ICU patientsBMI <25 R
PN for 7 days
Control
The TOP UP Trial
Fed enterally
Primary Outcome
60-day mortality
BMI >35
Stratified by:SiteBMI
Med vs Surg
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Muscle Outcome Assessments
in TOP UP• Measures of muscle mass and function
– mitochondrial complex I activity– US of femoral quad (baseline and follow up CTs when available) – Hand grip strength– 6 min walk test– SF 36 (RP and PCS)
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Reliability of US measure of Quad Muscle Layer Thickness
• 46 pairs of within operator measurements with an ICC of .98• 73 pairs of operator 1 to operator 2 measurements with an ICC of .94. •There was a small but statistically significant difference between the operator 1 and 2 results Mean (operator 1-2) (95% CI) = -0.061 cm (-0.100 to -0.022), p= 0.0028.
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Lancet 2009;273:
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In Conclusion• Health Care Associate Malnutrition is rampant• Not all ICU patients are the same in terms of ‘risk’• Iatrogenic underfeeding is harmful in some ICU patients or
some will benefit more from aggressive feeding (avoiding protein/calorie debt)
• BMI and/or NUTRIC Score is one way to quantify that risk• Need to do something to reduce iatrogenic malnutrition in your
ICU!– Audit your practice first! (JOIN International Critical Care Nutrition Survey in 2013)– PEP uP protocol in all– Selective use of small bowel feeds then sPN in high risk patients
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Questions?