ASPEN Self-Assessment: Nutrition Assessment Flashcards
(T/F)
Catabolism of endogenous substrate including fat stored in adipose tissue (lipolysis) is common in both forms of malnutrition.
TRUE.
Hypoglycemia and ketosis are characteristic of starvation.
Hypermetabolism and hyperglycemia are characteristic of stress-related malnutrition.
Explain albumin.
A negative acute-phase protein.
Levels decrease in response to stress and hypoalbuminemia is more a reflection of the degrees of stress resulting from disease, injury, and inflammation than nutritional status.
Hypoalbuminemia has been associated with increased short-term mortality, length of hospital stay, and complications and correlates strongly with 30-day mortality.
Explain hyperhomocysteinemia.
Has been linked to an increased risk for coronary atherosclerosis.
Studies have shown that folic acid, vitamin B6, and vitamin B12 supplementation can reduce plasma homocysteine concentrations.
It is not known whether hyperhomocysteinemia is a causative factor of atherosclerosis or simply a marker of vascular disease.
What are the appropriate fluid requirements for each below?
- Healthy adults, aged 18-55
- Healthy adults, aged 55-75
- Healthy adults, older than 75
- Fluid restriction
- Healthy, aged 18-55: 35 ml/kg
- Healthy, aged 55-75: 30 ml/kg
- Healthy, older than 75: 25 ml/kg
- FR: Less than 25 ml/kg
Which amino acid is a key fuel for the small intestine?
Glutamine
It is essential for small intestinal structure and function.
Could be useful to supplement glutamine to patients who are suffering trauma or receiving PN.
What are two conditionally essential amino acids?
Glutamine & Arginine
- Other conditionally essential AAs are: Cysteine, glycine, proline, and tyrosine
- Conditionally essential AAs are synthesized from other AAs under normal conditions but require a dietary source in order to meet increased needs caused by metabolic stress.
(a) Example: Arginine becomes conditionally essential for wound healing.
Explain the recommendations for vitamin A deficiency with and without concurrent corticosteroid therapy.
For deficiency: 2,000 to 200,000 IU/day (606 - 60,600 RAE/day)
To counteract the inhibitory effects that steroids have on collagen synthesis and connective tissue repair: 3,000 to 15,000 RAE/day x 7 days orally
To enhance wound healing with concurrent corticosteroid use: 3,000 to 4,500 RAE/day orally
Zinc deficiency is most commonly associated with?
Diarrhea
The overall biochemical functions of zinc can be categorized as catalytic, structural, and/or regulatory in nature. Additional zinc is recommended in patients with additional losses from thermal injury, excessive GI losses such as diarrhea, decubitus ulcers, and high output fistulas
Copper toxicity is associated with what disease?
Liver Disease
- Copper toxicity can cause severe N/D/V. More serious manifestations with acute or more chronic toxic ingestion or Wilson’s disease include: coma, hepatic necrosis, liver failure, renal failure, vascular collapse, and death.
- Since about 80% of copper is excreted in the bile, patients who have liver disease should be monitored and supplementation reduced or eliminated.
- HD increases copper losses
- Enteral zinc supplementation can complete with copper for absorption.
What can result in an invalid IC measurement?
Chest tube leak
- IC is a respiratory measurement that under proper conditions is equivalent to metabolism, any factor that violates these conditions is a contraindication to IC.
- Examples: air leaks; extracorporeal membrane oxygenation(ECMO); HD; FiO2 > 60 in mech. vented patients; and for spontaneously breathing patients - reliance on supplemental oxygen; inability to cooperate with measurement, and claustrophobia or anxiety
-If RMR is the desired value to be measured (it usually is), then any factor that prevents that patient from being at rest or cooperating with the device operator is also a contraindication.
Explain REE.
Resting Energy Expenditure
- REE measured under steady stable conditions closely approximates true 24-hour energy expenditure.
- The addition of a stress or activity factor may not be necessary and could result in overfeeding.
- If a patient is measured while fasting or if feedings are intermittently provided, it is reasonable to allow an additional 5% factor to account for thermogenesis.
- Therefore, a critically ill patient’s energy delivery in response to REE does not need to be modified when measured by IC. AKA No stress/activity factors are needed.
Explain respiratory quotient (RQ).
RQ = CO2 produced/O2 consumed
Defined as the volume of CO2 released over the volume of O2 absorbed during respiration.
RQ <0.7 or >1.0 means?
Hypoventilation or hyperventilation
RQ of 0.71 means?
Primarily fat oxidation
RQ of 0.82 means?
Primarily protein oxidation
RQ of 0.85 means?
Suggests mixed substrate utilization
RQ of 1.0 means?
Carbohydrate oxidation
Facts about Crohn’s disease.
Malnutrition is the most common in this form of inflammatory bowel disease because Crohn’s usually involves the small intestine
- Can impact any area of the GI tract (mouth to anus)
- Depending on severity of illness, weight loss has been reported in 20% to 85% of those with Crohn’s
- 65-75% of inpatients and more than 50% of outpatients experience significant weight loss
- Possible mechanism for malnutrition in this disease: Malabsorption from diseased small bowel mucosa; increased nutrient requirements from active inflammation; and reduced oral food intake due to abdominal discomfort and diarrhea
Explain appropriate treatment for ascites.
- Fluid
- Sodium
- Protein
Includes fluids and sodium restriction.
- Protein intake: 1.0 - 1.5 g/kg/day for patients with cirrhosis.
- While optimum nutrition support may not be possible, use of maximally concentrated solutions provides the best opportunity to avoid further salt and fluid overload while providing necessary substrate for anabolism
Where is dietary fat primarily absorbed?
Duodenum and proximal jejunum
- Dietary fat is absorbed in the proximal small bowel
- Lingual lipase released in the mouth and gastric lipase produced in the stomach have a limited role in fat digestion in healthy adults.
- Bile acids secreted by the liver as well as lipase and colipase produced by the pancreas aid in the micellar solubilization and absorption of dietary fat.
Resections and nutrient absorption.
Resections of the proximal bowel, including the duodenum and proximal jejunum, are generally better tolerated because of ileal compensation and adaption.
- In general, ileal resection is poorly tolerated because of adaptive hyperplasia in the remaining jejunum is limited.
- The ileocecal valve slows intestinal transit allowing for greater absorption of nutrients.
- Colon has critical roles in fluid and nutrient absorption.
- Therefore, patients lacking a colon are at greater risk of dehydration.
- The colon is capable of salvaging calories through anaerobic bacterial fermentation of undigested carbohydrates into SCFAs.
Explain methotrexate.
Methotrexate acts by interfering with the normal intracellular metabolism of FOLATE.
- Drug used to treat cancer
- It is a folate analogue that became available in the 1950s
- Structurally similar to FOLATE
- It competitively inhibits dihydrofolate reductase (an enzyme that catalyses the conversion of dihydrofolate to tetrahydrofolate, a cofactor in the synthesis of purine nucleotides and thymidylate.
- Therefore, methotrexate impairs malignant growth by interfering with the DNA synthesis, repair and cellular replication.
Copper deficiency is associated with?
Microcytic hypochromic anemia
- Patients on long-term PN have developed anemia, leukopenia, neutropenia, and skeletal abnormalities.
- Other symptoms of copper deficiency are: sensory ataxia, lower extremity spasticity, parathesis in extremities, leukopenia, neutropenia, and hypercholesterolemia
Deficiencies of B12 or folate result in what?
Macrocytic anemia (large red blood cells)
Does a prominent iliac crest pertain to muscle or fat loss?
SubQ fat loss
Explain SGA
Subjective Global Assessment (SGA)
- Uses 5 historical components (weight history, dietary intakes, GI symptoms, functional status, and metabolic demand)
- 3 physical components (Fat depletion, muscle wasting, and nutrition-related edema)
(TRUE/FALSE) SGA is appropriate for use in critically ill patients?
FALSE
ASPEN and SCCM recommend the use of NRS-2002 or NUTRIC tool to determine risk in this patient population.
Explain NRS-2002 tool.
Appropriate for critically ill patients (5 Factors):
- Unintentional weight loss
- BMI
- Disease severity
- Impaired general condition
- Age >70
Explain the NUTRIC tool.
Appropriate for critically ill patients (5 Factors)
“Nutrition Risk in Critically Ill”
**Focuses on the severity of illness
- Age
- APACHE II score (ICU mortality prediction score)
- SOFA (Sequential Organ Failure Assessment)
- # of comorbidities
- Days from hospital to ICU admission
Explain NRI tool.
“Nutritional Risk Index (NRI)”
Uses serum albumin and the ratio of current weight to the usual weight
What does an elevated C-reactive protein indicate?
Inflammatory status, which may be the reason for hypoalbuminemia.
-Positive acute-phase proteins such as CRP increase during inflammation, whereas negative acute-phase proteins concentrations such as albumin and pre-albumin decrease during inflammation.
Where is iron primarily absorbed?
Jejunum
Cheilosis is a physical symptom associated with a deficiency of?
Riboflavin
-Cheilosis = cracking of the corners of the mouth
What compromises the reliability of urinary urea nitrogen to calculate nitrogen balance
creatinine clearance <50mL/min
What micronutrient has been shown to decrease plasma homocysteine concentrations
folic acid
hyperhomocysteinemia concentrations has been associated with an increased risk of
atherosclerosis
which three micronutrients can be supplemented to decrease homocysteine levels in plasma to decrease the risk of atherosclerosis
folic acid, vitamin B12 and vitamin B6
what is the most appropriate fluid requirement for a healthy 78 year old adults
25mL/kg/day
what is the recommended fluid requirement for healthy adults between the ages of 18-55
35mL/kg/day
what is the recommended fluid requirement for adults between the ages of 55 and 75 years old
30mL/kg/day
what is the recommended fluid requirement for adults with fluid restriction such as CHF
25mL/kg/day
What enzyme initiates the digestive process of carbohydrates in the mouth
salivary amylase
Lipase is an enzyme released by the pancreas that helps the digestion of
fat
Lactase and Maltase are enzymes located in the ______ of the small intestine to aid in intraluminal carbohydrate digestion
brush border
Iron is primarily absorbed in the __________ and ________ in the _______ state. Gastric ____ is very important in maintaining dietary iron in the _____ state
duodenum and jejunum
ferrous
acid
ferrous
What amino acid is most crucial in small intestine structure and function
glutamine
In persons with phenylketonuria (PKU), tyrosine becomes an essential amino acid due to a deficiency of
the phenylalanine hydroxylase enzyme
Phenylalanine Hydroxylase catalyzes the hydroxylation of phenylalanine to _______, so phenylalanine levels become _____ and _____ levels are decreased
tyrosine
elevated
tyrosine
Conditionally essential amino acids are synthesized from other amino acids under normal conditions but require increased needs from dietary sources during ________. For example, arginine becomes conditionally essential for _______ and _____ during trauma
stress
wound healing
glutamine
glutamine becomes conditionally essential during
trauma
arginine becomes conditionally essential during
wound healing
What are the conditionally essential amino acids
arginine, cysteine, glutamine, glycerin, proline, tyrosine
An NPO post operative patient has been on 2 in 1 PN for 3 weeks. He develops hair loss, diffuse scaly dermatitis, anemia and thrombocytopenia. What is the probable cause
he has not been getting ILE for 3 weeks
Provision of fat free PN for ____ weeks has resulted in essential fatty acid deficiency
3 weeks
Essential Fatty Acid deficiency usually results after ___ weeks of fat free PN, although signs and symptoms of deficiency can be as early as ___ to ____ days
10-20 days
what are the signs and symptoms of EFAD
alopecia, scaly dermatitis, impaired wound healing, anemia, thrombocytopenia
Provide __ to ___% total calories from ____ or ____ ILE to prevent EFAD
4-10% total calories
soy of safflower oil ILE
Which IV fluid most closely resembles jejunal and ileal electrolyte content
lactated ringers
Fluids and electrolytes of the jejunum contains ____ mEq of sodium, ___ mEq of potassium, ___ mEq of chloride and ____ mEq of bicarb
95-120 mEq of sodium
5-15 mEq of potassium
80-130 mEq of chloride
10-20 mEq of bicarb
Fluids and electrolytes of the ileum contains ____ mEq of sodium, ___mEq of potassium, ___ mEq of chloride and ___ mEq of bicarb
110-130 mEq of sodium
10-20 mEq of potassium
90-110 mEq of chloride
20-30 mEq of bicarb
Lactated Ringers IV solution contains ___ mEq/L of sodium, ___ mEq/L of potassium ____ mEq/L of chloride, ____ mEq/L of lactate and ___ mEq/L of calcium
130 mEq/L of sodium 4 mEq/L of potassium 109 mEq of chloride 28 mEq/L of lactate 2.7 mEq/L of calcium
Normal saline contains ___ mEq/L of sodium, ____mEq/L of chloride
154 mEq/L sodium
154 mEq/L chloride
Half Normal saline contains ___ mEq/L of sodium and ____ mEq/L of chloride
77 mEq/L sodium
77 mEq/L chloride
Dextrose and half normal saline contains ____ g/L of glucose, ___ mEq/L of sodium and ____ mEq/L of chloride
50 g/L dextrose
77 mEq/L sodium
77 mEq/L chloride
What are the clinical symptoms of inappropriate diuretic hormone (SIADH)
increased urinary sodium
hyponatremia
increased urinary osmolality
a disorder of sodium and water balance caused by inappropriate release of anti-diuretic hormone which causes increased total body water which causes dilution hyponatremia
SIADH
In SIADH, increased sodium and osmolality of the urine is due to
excessive water retention/re-absorption
In SIADH to compensate for the expansion of the extracellular fluid, aldosterone secretion is inhibited to maintain
euvolemia
A 45 year old patient with chronic corticosteroid use has suspected vitamin A deficiency. Supplementation of vitamin A (3,000 to 5,000 IU) should be given at a max of ____ days
7 days
what are the main functions of vitamin A
wound healing, cell differentiation, and collagen synthesis
what is the typical dose for vitamin A supplementation
3,000 to 5,000 IU for 7 days
when should vitamin A be supplemented
to enhance wound healing with corticoid steroid therapy
Corticosteroid therapy has been shown to decrease vitamin ______
vitamin A
A patient with alcoholism is admitted with a small bowel obstruction and is started on PN. The PN provides 400 grams of dextrose, If after 3 days, the patient develops mental status changes, it is most likely due to a deficiency of
thiamine
alcohol related thiamine deficiency presents as
Wernicke’s Encephalopathy
Symptoms of Wernicke’s Encephalopathy are
mental status changes, confusion, nystagmus, gait ataxia
The glucose load in PN is associated with PN increases metabolic demand for ____ which is essential for glucose metabolism
thiamine
Lactic acidosis can be a result of which vitamin deficiency
thiamine
Thiamine is required for ____ metabolism. When Pyruvate is converted to acetyl CoA. If thiamine is not present, pyruvate will convert to production of _____ fermentation
glucose
lactic acid fermentation
In addition to aggressive refeeding, what else places patients at high risk for hypophosphatemia
DKA
Which patients are at the highest risk for hypophosphatemia
malnourished, DKA, chronic alcoholism, respiratory and metabolic acidosis, critical illness
Insulin is an anabolic hormone that drives potassium and phosphorous into the cells causing serum _____ of these electrolytes
depletion
in DKA, large amounts of ____ is lost in urine from the osmotic diuresis resulted from hyperglycemia
phosphorous