WEEK 14 Flashcards
Tube feed Advantages over PN
low cost, safe, well tolerated, easy to use in extended care and home setting
o Preserve GI integrity
o Preserve usual sequence of intestinal + hepatic metb
o Maintain fat metb + lipoprotein synthesis
o Maintain appropriate insulin/glucagon ratios
WHere are these tubes placed and what are they called?
WHy would one be used over the other?
- NG intubation or gastrostomy = into stomach
- Nasoduodenal or nasojejunal = to distal duodenum or proximal jejunum → this is indicated when esophagus or stomach need to be bypassed or when pt is at risk of aspiration
Gastronomy or jejunostomy tubes when?
for med or food over long term (>4weeks)
Conditions requiring enteral feeding:
o Preop bowel prep
o GI issues (fistula, Crohn’s, UC, etc)
o CA therapy (radiation + chemo)
o Convalescent care (survery, injury, severe illness)
o Coma, semiconsciousness
o Hypermetabolic conditions (burns, trauma, AIDS, organ transplantation)
o Alcoholism, chronic depression, anorexia nervosa
o Debilitation
o Facial or cervical sx
o Oropharyngeal or esophageal paralysis
WHy is osmolarity an important consideration for tube feeds?
WHat is the osm of body fluids?
- Osm important for duodenal or jejunal because high osmo may lead to dumping syndrome
- Osm of body fluids approx 300mmol/kg - body tries to maintain this by moving fluids by osmosis
WHich molecules have small/large effects osmotic effects? Amino acids Carbs Proteins Lipids Electolytes
- Amino acids + carbs have highest osmotic effect (are small molecules)
- Proteins (large) have less osmotic effect
- Lipids have no osmotic effect
- Electrolytes have big effect on osmolality and thus big influence on pt ability to tolerate a soln
How does dumping syndrome occur as a result of tube feed with high osm?
• High osm soln taken → H20 moves into stomach + intestines → pt has fullness, nausea, diarrhea → dehydration, hoTN, tachycardia = dumping syndrome
Does diluting a solution help to dec risks intolerance?
Who are particularly intolerant of high osm feeds?
- May help to dilute soln at first…not clear evidence for this
- Those who are debilitated not as tolerant
What sort of factors/components of tube feed are considered when deciding on type of tube feed?
- Depends on GI tract and nutritional needs
- Consider chemical composition of nutrient source (protein, carbs, fat), caloric density, osmolality, residue, bacteriologic safety, vitamins, minerals, cost
• Have disease specific formulas
• Polymeric formulas = ?
Examples?
high molecular weight; composed of proteins, fat, and carbs in high-molecular-weight form (ex: Ensure,Isosource, Osmolite)
• Chemically defined formulas =
predigested
go into jejunostomy
What are modular formulas?
= contains only one nutrient (ex: Beneprotein = just protein) → sometimes use a combo of these in patients who can’t tolerate certain components of other prepared solutions…then just add the other constituents, nutrients, etc.
What is sometimes added to the formula for those at risk of diarrhea?
fibre
Are NG + nasoenteric tube feedings generally well tolerated?
Many don’t tolerate NG + nasoenteric tube feedings well
Different tube feed methods? (bolus, etc.)
• Can be given as intermitten bolus feedings, intermittent gravity drip, continuous infusion, cyclic feeding
How frequently is Intermittent bolus given into stomach (usually by gastrostomy tube) typically?
4-8x day
Intermittent gravity into stomach used when? Over what time period is it typically admin’d?
when pt at home – admin over 30 mins at scheduled intervals
Continuous infusions…
When is this used?
Pros and cons?
- Continuous infusion used when admin into small intestine; preferred for pt at risk of aspiration + those who tolerate tube feedings poorly;
given at constant rate w pump
PROs: dec’s abd distension, gastric residuals
CONs: less pt flexibility, pump is expensive
WHen is cyclic feeding used? How?
infusion given over 8-12hrs, can be done at night; may be appropriate for pt being weaned from tube feedings, as supplements for those who can’t eat enough + those at home that need daytime hours free from pump
What nursing assessments need to be done with those pt’s on tube feeds?
- Nutritional status
- Existing chronic illnesses or factors that inc metb rate (sx, fever)?
- Hydration status
- GI tract functioning?
- Kidney fx? Electrolyte levels?
- Any meds that affect nutritional intake and fx of GI tract?
- Does dietary prescription fulfill client needs?
o Tube placement, pt position (HOB at 30-45 degrees), formula flow rate
o Pt tolerance: fullness, bloating, distension, urticaria, N+V, stool pattern + character?
o Clinical responses (BUN, serum protein, prealbumin, lytes, renal fx, Hb, HCt)
o Dehydration?
o Report elevated BG, dec urinary output, sudden weight gain, periorbital or dependent edema
o Residual vol before each feeding or q4hrs if continuous – return aspirate to stomach
o I/O
o Weight twice weekly
o Consult dietician regularly
What sort of outcomes need to be reported?
Report elevated BG, dec urinary output, sudden weight gain, periorbital or dependent edema
How often is open system formula replaced? Tube feeding containers + tubes?
Open systems formula replaced q4hrs
o Tube feeding container + tubes change q24-72 hrs
How often should pt be weighed when on tube feed?
Med surg says 2x weekly
P+P say 3X weekly (at first daily until full established rate for 24hrs)
Pt diagnoses for tube feed?
- Imbalanced nutrition r/t inadequate intake
- Risk for diarrhea r/t dumping syndrome or tube feed intolerance
- Risk for ineffective airway clearance r/t aspiration from tube feeding
Planning and goals for pt on tube feed?
- Nutritional balance
- Usual bowel pattern
- Reduced risk of aspiration
- Adequate hydration
- Prevention of complications
- Knowledge + skill in self-care
Ensure Gravity feeds placed…
above level of stomach
Bolus feedings. What vol + how often typically?
300-400mL q4-6hrs
o Continuous feed rates depend on?
caloric density of formula + energy needs of pt
What is the goal for tube feeding regarding weight and Nitrogen balance? Without producing?
o Want positive N balance and weight maintanence/inc w/t producing abd cramps + diarrhea
Intermittent feeds. How much given usualyl and over how long?
200-350mL given over 10-15mins
Advantage of pump for tube feed?
allows admin of viscous fluid through small tube
Residual gastric content measured when? How often during continuous feeds?
before each intermittent feeding + q4-8hrs during continuous feeding
What residual vol (GRV) warrants concern?
o Res vol of 200mL or greater = concern for those at high risk of aspiration…if this occurs twice, nurse to notify physician (med-surg)
P+P says >250mL twice or 500mL once
WHen is flushing done on tube feed?
- Before + after each dose of med + tube feeding
- After checking for gastric residuals + gastric pH
- Q4-6hrs with continuous feedings
- If tube disconnected or interrupted for any reason
- When tube not being used, done twice daily
- Record in fluid intake!
Why flushing?
With how much?
o Maintain patency, reduce risk of bacterial growth, crusting and occlusion
30-50mL
What to do if med to be given through tube feed is not liquid?
Can you mix meds to be given and/or mix them with tf formula?
o If not liquid, must be crushed to fine powder first + dissolved
o Do NOT mix meds with each other or tube feeding formula
o Each med given separately as bolus according to med’s preparation
How big should syringe be when administering into tube feed?
o When small-bore tube for continuou infusion used, use 30mL syringe or larger so don’t rupture tube
Consideration for giving meds into post-pyloric tb?
o Giving meds into post-pyloric tubes may adversely affect absorption…avoid if possible
What to do with enteric coated and timed-release meds when giving in tf?
o Enteric coated and timed-release tablets can’t be crushed – need to get alternativ formulation
o Some timed-release capsules or sustained-release capsules can be opened and contents added to tube feed formulas – ALWAYS check with pharmacy first!
o Feeding container + tubing change how often?
q24-72hrs
how is formula given to admin into open system?
Open = liquid or powder to be dissolved in H20
amount in bag should never exceed what will be infused in __hour period? Why?
o To avoid bacterial growth, amount in bag should never exceed what will be infused in 4 hour period
What is a closed system for tf and how long can it be hung for?
o Closed = prefilled, sterile container spiked with enteral tubing; can be hung safely for 24-48hrs
What are possible causes of diarrhea with tube feed that need to be ruled out?
- Dumping syndrome
- Contaminated formula
- Malnutrition (dec in intestinal absoption)
- Medication therapy – abx, digoxin, antiarrhythmics found to inc diarrhea
- C. Dif infection