Special Deliveries…. …..With Love and Fresh Air Monika Bhola, MD Neonatologist Rainbow Babies & Children’s Hospital Conflict & Disclosures • I have no conflict of interest • However there is one disclosure…..I have a very soft spot for our respiratory department. OBJECTIVES • Briefly Discuss some salient features of Neonatal Resuscitation • Highlight the differences in resuscitation of neonates vs. older children/adults • Oxygen use/misuse • Temperature management • Births outside of a major center Transition to Extra-uterine Life • Transition from fetal life to extra-uterine life is the most complex physiologic adaptation that occurs in a human being’s life • Changes occur in almost every organ system but the primary changes are in the respiratory and cardiovascular systems • Clearance of fetal lung fluid • Surfactant secretion and breathing • Transition of fetal to neonatal circulation • Decrease in pulmonary vascular resistance and increased pulmonary blood flow • Endocrine support of the transition NEWBORN RESUSCITATION • Approximately 10% require some assistance to begin breathing or 90% transition well • Less than 1% require extensive measures to survive (chest compressions and medications) Term –Vigorous Baby • If the baby is term (>37) weeks and has good tone and respiratory effort- just dry the baby and keep the baby warm • Placing baby on the mom- skin to skin- is the best way to keep this baby warm How is Baby CPR different? • It is still A-B-C • Or as I like to call it A-A-A-A-A - B & C • Their “arrest” is not necessarily an arrestbut apnea • Do not need 100% oxygen, initially • If compressions are needed – the landmarks are a little different Oxygen at Birth • In the past we felt and some still do “It can’t hurt……..” Words of Wisdom • “all substances are toxic: only the dose makes a thing not a poison.” »Paracelsus, 1524 • “……the air that nature has provided for us is as good as we deserve.” » Priestley, 1775 » Compared to a candle » Lessons learnt from the past Case Against Oxygen • Ischemia and Hypoxia → cellular changes affecting antioxidant defenses as well as enzyme activities, membrane transports, mitochondrial function • Hypoxia → ↓ATP synthesis and Na/K pump alteration → cell edema and hypoxanthine accumulation → + Oxygen = toxic reactive oxygen species » Superoxide anions, hydrogen peroxide, hydroxyl radicals, nitrogen reactive species • Ischemia → promotes proinflammatory cytokines and bioactive agents → tissue vulnerability on re-perfusion Oxygen Use • In utero the fetus develops in a relatively hypoxic environment with saturations of 50-60% • Sudden exposure to 100% oxygen can worsen cell and tissue injury • Oxygen free radicals-antioxidants, apoptosis and re-perfusion injury Oxygen vs RA • Animal studies – severe hypoxia model • Resuscitation with 100% and RA • BP and blood flow restoration to brain and other markers were comparable • Recent studies have shown a distinct advantage to using RA Case for Room Air (RA)…… • Meta analysis of 1082 newborns resuscitated with Room air initially and 1051 received 100% • The ones in which resuscitation was initiated with RA had a reduced risk of death • Saugstad et al, Neonatology, 2008 ……RA • A single breath of 100% oxygen in the first week of life– has resulted in decrease of minute volume • Also duplicated in mice studies • Delay in initiation of breathing with oxygen vs RA • Hyperoxia in newborn animals – causes histological changes in brain and other organs • In other animal studies- 100% oxygen in the first few days- saw evidence of pulmonary disease and cardiac failure more than a year later and lead to a shorter life span. Baby Brains and Oxygen • 70 preterm infants stabilized with either RA or 80% • Oxygen exposed neonates had decreased cerebral blood flow for 2 hrs (Lundstrom et al, 1995) • Similar findings by other researchers also found decreased cerebral blood flow velocity (Niijima etal) What is the right balance? • Compromised Fetus Anaerobic Metabolism → Production of Lactic acid • If short → easily reversible with airway establishment • If prolonged energy failure membrane depolarization or death → → cell cellular injury Target Spo2 after birth 1min 2min 3min 4min 5min 10min 60-65% 65-70% 70-75% 75-80% 80-85% 85-95% How Can we safely deliver oxygen • Should have blenders • Start resuscitation with RA for term babies • Preterm babies 30-40% • Don’t have blenders / home delivery/ ER/ ambulance – Self inflating bag- without reservoir will give about 40% OXYGEN DELIVERY USING SELF INFLATING BAG FiO2 values obtained at different oxygen flow rates (range 0–10 L/min) over time during PPV at a respiration rate of 40 to 60 per minute and PIP of 25 cm H2O. Trevisamuto D etal, Pediatrics 2013;131:e 1144-1149 Airway • Proper equipment for Neonates • Correct Size Face mask- Term and Preterm • Self inflating Bags-240 ml • Anesthesia bag • Manometer • T-piece/ Neopuff • ET tubes- 2.5, 3.0, 3.5 - uncuffed • LMA – Size 1 • Miller Laryngoscope blades-Size 1 & 0 Chest Compressions • Lack of gas exchange with simultaneous hypoxia and carbon dioxide elevation- most common reason that newborns fail to transition successfully • If there is significant hypoxemia and acidosis- the myocardium could be depressed Airway…. (again!) • It is ABSOLUTELY essential to establish EFFECTIVE ventilation for 30 secs–prior to chest compressions • Corrective measures should be tried if unable to get effective ventilation • M-R-S-O-P-A MRSOPA- (Corrective Measures) M Mask Seal R Reposition of head S Suction O Open Mouth P Pressure Increase A Alternate Airway Temperature Management Thermo Neutral Zone in Humans • Unclothed resting adult—23-28⁰ C (73⁰F) • Unclothed full term neonate—32-35⁰ C (90⁰ F) • Unclothed 1 Kg preterm neonate– 35⁰C (95⁰ F) Heat Loss In New Borns Temperature and Resuscitation • WHO recommends that the DR temperature should be about 72⁰F or mid 70’s • If preterm delivery is expected then the temperature should be around 77-79⁰F • Other modes of keeping the baby warm – – – – – Radiant Warmer Warm blankets Warm gel packs Baby hats Thermal plastic wrap Picture of Basic Equipment Infant PortableThermal Packs Warm Blankets Consequences of Hypothermia in Preterm Infants • 36.5-37.5ºC • Every 1º drop in baby’s temperature increases mortality risk by 28% !!!!! Other sobering data…. • Hypothermia is associated with increase in morbidity • Respiratory Distress • Metabolic derangements • Intra Ventricular Hemorrhage • Infection • Increased hospital length of stay Hyperthermia • Elevated temperature increases the risk of death or impairment – almost 4 fold increased risk • This is worse if there has already been a brain injury • A rise of just 1.5ºC above normal can cause significant impairment Not Too Hot Not Too Cold Special Considerations Viability • Less than 23 weeks- survival chances are very poor • Survival has improved over the years • NRP recommends offering resuscitation if 23 weeks and >400gms Survival Gestation 23 weeks al age Survival 24 weeks 50-60% 7080% 25 weeks 26 weeks 27 weeks 7585% 8090% >90% Special Considerations in Preterm Infants • Greater risk for injury • Lung-Protective strategy should start right at birth- GENTLE VENTILATION • PPV is the cornerstone of respiratory support • Very crucial to establish FRC- PEEP • Need to deliver adequate Tidal Volume- PIP Post Resuscitation • Temperature • Sugar- Never give new borns > D10W IV fluids • IV access • Normal D.stick-35-40 Emergency IV acess • If unable to start PIV- may place emergency Umbilical vein catheter • Place an umbilical tie • Clean with Betadine • Place a sterile catheter (5Fr) in the vein (largest vessel) till you get blood return (23 cms in preterm infants and about 5 cms in term • Avoid Intraosseous in preterm infants. Neonatal Encephalopathy • These babies should be transferred to a tertiary care center ASAP • Therapeutic cooling –significantly decreases mortality and neuro-developmental impairment • Therapeutic hypothermia should be instituted in a controlled environment and within 6 hrs • Prevent hyperthermia • Aim at keeping temperature at low end of normal Abdominal Anomalies • Gastroschisis- omphalocele • Place sterile wrap soaked in saline around anomalie • Prevent excessive insensible water loss • Place in sterile bowel bag • Place a replogle to decompress the bowel • Start IV- Fluids and Antibiotics Airway Anomalies • Pierre Robin or severe micrognathia and if in respiratory distress:• Place in supine position • If respiratory distress continues- may need a stable airway • Intubation • LMA • Nasopharyngeal ET tube Congenital Diaphragmatic Hernia • If in distress will need intubation • Avoid using bag and mask PPV- will worsen • Consider this diagnosis if you have a newborn with a scaphoid abdomen • Decompress the bowel • Intubate “Useful Accessory” Placenta Love & Fresh Air ?!*@# What was that all about? • Warmth- gentle ventilation = Love • RA or OWL (Oxygen with Love) = Fresh Air