Nutrition in the preterm - current menu Dr Heena Hooker Consulting Neonatal Paediatrician Aga Khan University Hospital, Nairobi

Transcription

1 Nutrition in the preterm - current menu Dr Heena Hooker Consulting Neonatal Paediatrician Aga Khan University Hospital, Nairobi

2 Outline O Background O Challenges in preterm nutrition O Parenteral Nutrition O Enteral nutrition O Role of supplements O Nutritional monitoring O New developments O Summary

3 Introduction O Nutrition is an essential component for growth, metabolism immunity and neurodevelopement in a preterm O Poor nutrition O Poor head growth poor psychomotor and mental skills O Adverse neurodevelopemental outcomes O Barker hypothesis O Low birth weight infants at high risk of O Coronary heart disease O Hypertension O Type 2 diabetes in adulthood O Current nutritional strategies unable to prevent postnatal growth restriction

4 Nutritional challenges O Born at a time of otherwise rapid growth in utero O Phenomenal growth demands a much higher intake of energy, protein and other nutrients O Structural and functional immaturity of the gut O Immature coordination of sucking, swallowing and breathing making suckling difficult O Low stores of key micronutrients (iron, zinc, calcium, vitamins) + low subcutaneous stores of fat and glycogen most placental transfer occurs in third trimester O Medical conditions increase metabolic energy requirements

5 Nutritional goal O Achieve rates of growth and nutrient accretion that match those achieved by infants of similar gestational age in utero O Rate of growth O INTERGROWTH 21 st century 2014 O Nutrient accretion O Chemical analysis of fetal cadavers O Contemporary non-invasive neutron activation techniques

6 Energy Requirements O Parenterally fed kcal/kg/day O Enterally fed 120 kcal/kg/day O Chronic illness 150 kcal/kg/day

7 Recommended enteral nutrient intakes for preterm infants. Nutrient Per kg per day Nutrient Per kg per day Fluid, ml Calcium, mg Energy, Kcal Phosphate, mg Protein, g Vitamin D, IU Fat, g Vitamin A, IU Carbohydrates, g Iron, mg 2-3 ESPGHAN Committee on Nutrition. Agostoni C, Braegger C, Decsi T, Kolacek S, Koletzko B, et al. Role of dietary factors and food habits in the development of childhood obesity: a commentary by the ESPGHAN Committee on Nutrition. J Pediatr Gastroenterol Nutr (2011)

8 Parenteral nutrition

9 Parenteral feeding: Rationale O First weeks of life in the VLBW (<1500 g) as enteral nutrition is established O Helps treat in utero growth restriction and postnatal growth failure O Initiated as early as possible, even on the first day of life O Administered through a central line mostly (can be given peripherally) O Laboratory monitoring required O Adjust contents of the solution O Avoid excesses and deficiencies O Monitor for complications

10 Parenteral feeding: Challenges O Appropriate administration of intravenous nutrition can be difficult in the first few days O Infusion of drugs, volume boluses to maintain BP O Maintenance of vascular access O Preterms barely receiving 30-50% of estimated nutritional intake (surveys in Europe and USA) O Undernutrition O significantly affects early postnatal growth O causes electrolyte imbalances due to cellular catabolism O Suboptimal nutrition attributed to O lack of confidence in consensus guidelines O fear of adverse metabolic outcomes

11 Parenteral nutrition: Requirements O Glucose 3.5 mg/kg/min to a maximum of 12 mg/kg/min (close blood glucose monitoring) O Amino acids 3.5 g/kg/day to a maximum of 4 g/kg/day (essential and nonessential) O Lipids 1g/kg/day to a maximum of 3g/kg/day (20% solution) O Other nutrients O trace elements O minerals, O vitamins O electrolytes

12 Parenteral feeding: Issues O Restricted vs. liberal fluid intake? O risk of PDA and NEC with fluid restriction (Cochrane Database 2014) O Many uncertainties O Ideal quantity and balance of amino acids O Optimal content of lipid emulsions O Optimal intake of macronutrients and how rapidly they can be increased (Harding et al, Lancet 2017)

13 Parenteral nutrition: problems O Complications O Cholestasis O Line infection and sepsis O Air embolus O Infiltration and skin sloughing

14 Enteral nutrition

15 Enteral feeding: Issues O Breast milk or formula? O Early or late? O Continuous vs. bolus? O Rapid vs. slow? O Nasogastric or orogastric? O Does enteral feeding increase the risk for NEC?

16 Milk which milk? O Mother s own breast milk O Donor breast milk O Fortified breast milk O Preterm formula (ESPHGAN guidelines)

17 Intakes of key nutrients from various enteral nutrition feedings for preterm infants in the United States, assuming milk intake of 160 ml/kg per day Energy (kcal/kg/day) Protein (g/kg/day) Fat (g/kg/day) Carbohydrate (g/kg/day) Calcium (g/kg/day) Phosporus (mg/kg) Vitamin D (IU/day) Target Intake* Unfortified human milk Δ ( 20 kcal/oz) Fortified human milk ( 24 kcal/oz) Preterm formula (24 kcal/oz) to to to to to to to to to to to to to to to to to 384

18 Milk fortification O Principle of increasing the concentration of nutrients to meet the infant s needs within customary feeding volume O Monocomponent vs. multicomponent O Minimum volume of feed 100mls/kg/day O Standard fortification may not meet the recommended protein intake in preterm infants O Concept of individualized fortification O Targeted vs. Adjustable

19 Donor pasteurized breast milk O Available in countries with human milk banks O Milk should be pasteurized O Screened for HIV, HCV, HBsAg and veneareal disease O Donor mother should also be screened for the same ( 6 months) O Pooled milk may be used if proper consent obtained O Donor milk can be stored at -20 degrees for six months

20 Early vs. Late Enteral O Feeds O Early initiation of low volume feed shown to have many clinical benefits O Delaying enteral feeds does not reduce the risk of NEC Cochrane Database Systemic Review 2014

21 Benefits of Early Trophic feeds O O Better feed tolerance O Rapid maturation of intestinal motility patterns O Higher serum GIT hormones O Lowered risk of late onset sepsis O Lower incidence of conjugated hyperbilirubinemia O Better absorption of calcium and phosphorous and less osteopenia of prematurity

22 Rapid vs. slow advancement of feeds O Optimal rate not been established O Protocols vary from centre to centre O Mostly advance feeds at ml/kg/day O More rapid advancement of feeds (30 to 40 ml/kg/day) could be successful when used with a carefully managed protocol and does not increase the risk of NEC (Cochrane Systematic Review 2015)

23 Continuos vs. bolus O No nutritional advantage with either, in the absence of GIT disease O Most protocols provide enteral feeds every three hours O More frequent feeds or continuos feeds O Improve feed tolerance O Reduce time to attain full feeds O Greater weight gain O Fewer days on TPN (Demauro et al, 2011) O Continuos feeds are useful in infants with GIT disease, post-intestinal surgery and infants being fed via the transpyloric route

24 How to feed? Nasogastric vs. Orogastric O All preterms <1800 g O Nasogastric tubes O Increase airway resistance O periodic breathing and central apnoea O Orogastric tube feeds are the preferred option (Van Someran et al, Pediatrics 1984)

25

26 Breastfeeding the preterm Inadequate milk production Incomplete mammary development Inadequate milk intake Poor milk transfer due to sucking immaturity Stress Poor suck, swallow, and breath reflex

27 Breastfeeding the preterm O Steps to successful implementation of full breastfeeding in preterm below 34 weeks O Demonstration of oral skills indicating readiness to feed (non-nutritive sucking and rooting) O Initiation and advancement of breast feeding O Closely monitoring milk production and milk transfer O Transition to full breastfeeding O Encouraging mother to participate in care of the infant and kangaroo care

28 Late Preterm O =Preterms 34 to 36+ weeks O Look and behave superficially like term infants O Tendency to avoid medicalization of this group who are otherwise well O More likely to experience difficulty in establishing breastfeeding O Infants may not fully empty the breasts because of increased sleepiness, fatigue and difficulty maintaining the latch O These infants will require close monitoring and possibly supplemental feeds O Very little evidence-based data on early nutritional support of these infants

29 Nutritional supplementation

30 O Iron Nutritional supplements O Sodium and potassium O Calcium and Phosphorous O Vitamins

31 Nutrient Per kg per day Nutrient Per kg per day Fluid, ml Calcium, mg Energy, Kcal Phosphate, mg Protein, g Vitamin D, IU Fat, g Vitamin A, IU Carbohydrates, g Iron, mg 2-3 ESPGHAN Committee on Nutrition. Agostoni C, Braegger C, Decsi T, Kolacek S, Koletzko B, et al. Role of dietary factors and food habits in the development of childhood obesity: a commentary by the ESPGHAN Committee on Nutrition. J Pediatr Gastroenterol Nutr (2011)

32 O Low iron stores Iron O Often depleted by 2-3 months of age O Breast milk is low in iron O Iron supplementation 2-4mg/kg/day for all preterms on exclusive breast milk for the first year of life O Infants on iron fortified formula may not require supplementation

33 Sodium and Potassium O Regular monitoring O Daily in infants on parenteral fluids O Weekly in infants on enteral feeds O Requirements O Na+ 2 to 4 mmol/kg/day O K+ 1 to 2 mmol/kg/day O Supplementation may not be required in infants on fortified feeds and preterm formula

34 Calcium and Phosphorous O Low skeletal stores of calcium and phosphorous O Needed for healthy bones and growth O Preterm human milk content insufficient for the needs of the preterm infant O Insufficient evidence as to whether supplementation of calcium and phosphorous improves bone health and growth (Cochrane Database 2017) O No longer common practice to give supplements with the use of human milk fortifiers and preterm formula O More randomized studies required looking at outcomes with the use of fortifiers

35

36 Nutritional monitoring Growth parameters Laboratory markers O O O O Weight O O O Length O O Daily 18 g/kg/day (<2 kg) g/kg/day Weekly 1 cm/week Head circumference O O Weekly 0.5cm/week Rate of growth O Protein status O BUN Urea >3.5 mmol/l O Haemoglobin O Bone mineral status O Ca, PO4, ALP O Serum electrolytes O Na, K, HCO3 O Serum prealbumin (transthyretin)

37 Fenton preterm growth chart

38 Post discharge nutrition O Sucking/swallowing ability of the infant should be good at discharge O Ideal discharge weight may vary from centre to centre and depend on local services available to take care of the infant after discharge O Standard formula may be initiated once the infant has reached the birth centile O Complementary feeding may be initiated at a corrected age of four months O Monitored for up to a minimum of two years and preferably till adolescence

39 New developements O Use of standardized parenteral nutrition formulation- O Easy to use,stable,long shelf life O reduce prescription errors O O O Early oropharygeal administration of colostrum O O Improve early immune development Promote early commencement of breastmilk Emerging data highlighting the importance of Vitamin D for immune regulation Ongoing trials O role of insulin like growth factor in early nutrition O immunonutrients( Bilesalt stimulated lipase and bioactive peptides)

40 Summary O Enteral feeding is the safe and preferred option for preterms O Parenteral nutrition is a useful adjunct in VLBW infants O Early, fast and continuous feeding yield better outcomes compared to late, slow or intermittent feeds O Human breast milk remains the first choice

41 Summary O Fortification is safe and effective but does not fulfill high protein needs O Checking for optimal weight gain and sucking/swallowing ability essential prior to discharge O Regular follow up and monitoring will help achieve better long term outcomes

42 Asante Sana!!