Perinatal Depression. Lauren Sacco DNP, ARNP Seattle Children s
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1 Perinatal Depression Lauren Sacco DNP, ARNP Seattle Children s
2 Birth Asphyxia May occur in utero, during labor/delivery or during the neonatal period Condition of impaired blood gas exchange that leads to progressive hypoxemia and hypercapnia with metabolic acidosis. ACOG and AAP discourage the term asphyxia as imprecise, prefer the term depression Death or severe neurological impairment following perinatal asphyxia in 0.5-1/1000 live births
3 Birth Asphyxia The term birth asphyxia should be reserved for infants with four characteristics: Profound metabolic or mixed acidemia (ph<7.0) on umbilical arterial blood sample Persistence of an APGAR score of 0-3 for over 5 minutes Neurologic manifestations in the immediate neonatal period including seizures, hypotonia, coma or HIE Evidence of multi-organ system dysfunction in the immediate neonatal period
4 Risk Factors maternal Hypertensive disorders Cardiac disease Pulmonary disease Diabetes Sickle cell disease Renal disease Premature rupture of membranes Vaginal bleeding Severe anemia Rh/ABO sensitization Uterine or pelvic anatomic abnormalities Previous fetal or neonatal death
5 Risk Factors fetal Multiple birth Post-dates IUGR Premature Polyhydramnios Meconium stained amniotic fluid
6 Risk Factors Intrapartum Abnormal presentations Forceps (other than low) C-section delivery Prolapsed cord Abnormal heart rate or rhythm Prolonged general anesthesia Anesthetic complications (hypotension, hypoxia) Nuchal cord Prolonged or precipitous labor Uterine hypertonus Infection
7 Pathophysiology Definitions Hypoxemia: low blood oxygen levels Hypoxia: lack of oxygen in the tissues of the body Ischemia: reduction or loss of blood flow to an organ The fetus and neonate are more resistant to asphyxia than adults good at redistributing preferentially, oxygenated blood to the heart, brain and adrenals
8 Pathophysiologic sequence Can occur at any time, well defined series of events Onset of asphyxia results in period of rapid breathing followed by primary apnea Primary apnea is followed by irregular gasping and secondary apnea by 10 minutes Heart rate initially increases during the rapid breathing then falls along with the ph, BP and cerebral, pulmonary and renal perfusion.
9 Pathophysiologic sequence The infant s response to resuscitation will depend on duration of the asphyxia Will respond to stimulation if born during primary apnea Will need PPV if delivered during gasping or secondary apnea
10 Pathophysiologic sequence As hypercapnia, hypoxemia and acidosis worsen, cerebral blood flow (CBF) becomes pressure passive which leaves the infant at risk of cerebral ischemia w/ systemic hypotension and cerebral hemorrhage with systemic hypertension. Prolonged asphyxia results in decreased cardiac output, hypotension and decreased CBF, risking cerebral ischemia and cell injury. As less oxygen is available anerobic metabolism ensues.
11 Aerobic vs Anaerobic Metabolism
12 Systems Affected by Asphyxia Neurologic Hypoxic ischemic encephalopathy (HIE) Seizures Cerebral edema or hemorrhage Cardiovascular Poor contractility failure Pulmonary Delayed onset of respirations!shunting!pphn risk Risk of MAS
13 Systems Affected by Asphyxia Renal GI Acute Tubular Necrosis (ATN)!risk of failure Syndrome of Inappropriate Antidiuretic Hormone (SIADH) Risk of necrotizing enterocolitis (NEC) Hematologic Disseminated intravascular coagulation (DIC) Metabolic Hypoglycemia, hypocalcemia, altered electrolytes Hepatic Abnormal liver function tests (LFTs), clotting factors
14 ! Hypoxic-Ischemic Encephalopathy caused by either placental, maternal, or fetal injury results in neonatal brain hypoxia neonatal brain responds by converting to anaerobic metabolism > depletion of adenosine triphosphate increased lactic acid production disturbance in normal metabolic activity this response disrupts intercellular pumps in the brain, causes a buildup of: sodium, calcium, and water > accumulation of fatty acids and oxygen-free radicals these events, together, cause cell apoptosis Preceding the initial injury to the neonatal brain, a second phase of injury will ensue if intervention is not initiated
15 ! Hypoxic-Ischemic Encephalopathy (HIE) The second phase of HIE is not well understood Includes accumulation of excitatory neurotransmitters and cell apoptosis Once the second phase begins, any brain injury that occurs in this phase is irreversible 15
16
17 Allen, K. A., & Brandon, D. H. (2011). Hypoxic Ischemic Encephalopathy: Pathophysiology and Experimental Treatments. Newborn and Infant Nursing Reviews : NAINR, 11(3),
18 Assessment for HIE No particular lab test to rule HIE in or out Clinical presentation is the best indicator Degree of other system involvement, electrolyte abnormalities are dependent on the severity of the insult EEG and MRI correlation have predictive value Sarnat and Sarnat s 3 Clinical Stages of Perinatal Hypoxic Ischemic Brain Injury (1976)
19 Sarnat Score! 19
20 EEG tracing ( ,en.png
21 Mild HIE Mildly increased muscle tone, brisk deep tendon reflexes during the first few days Transient behavioral abnormalities: poor feeding, irritability, irritated crying, sleepiness Normal CNS findings by 3-4 days of life
22 Moderate HIE Lethargic infant with significant hypotonia and decreased deep tendon reflexes Grasping, Moro and sucking reflexes sluggish or absent Occasional periods of apnea Seizures usually occur in the first 24hrs of life Full recovery in 1-2 weeks is possible and associated with a better long term outcome
23 Severe HIE Stupor or coma is typical Irregular breathing, generally requires vent support Hypotonia and depressed deep tendon reflexes Neonatal reflexes (sucking, Moro, etc) are absent Pupils can be dilated, fixed or poorly reactive to light Seizures occur early and often and may worsen over the initial hours of recovery secondary to reperfusion injury Fontanel may bulge with increasing cerebral edema HR and BP irregularities are common secondary to cardiorespiratory failure Multiple organ involvement common
24 HIE outcomes Dependent on severity Mild (Stage I) HIE generally normal neurological outcome Moderate (Stage II) HIE some with normal outcomes, resolution of neurological symptoms and normal nipple feeding by 1-2 wks is a good prognostic sign 30-50% with serious long term complications (CP, mental retardation) 10-20% with minor neurological morbidities
25 HIE Outcomes, cont Severe (Stage III) HIE Mortality rate of 50-75%, most during the first month 80% of the survivors develop serious complications: mental retardation, epilepsy, CP 10-20% with moderately serious disabilities Up to 10% are normal One study showed school age children with a history of moderate to severe HIE but neurologically normal, 15-20% had significant learning disabilities
26 Management First goal is always prevention identify infants at risk and be prepared Immediate resuscitation, NRP In the neonatal period: Maintenance of adequate ventilation hypercarbia can increase cerebral intracellular acidosis and impair cerebral vascular autoregulation Maintenance of adequate oxygenation PaO2>40 in preterm, >50 in term, avoid hyperoxia
27 Management, cont. In the neonatal period, cont. Cooling is the standard of care Maintenance of adequate perfusion maintain BP in the normal range for GA, volume and inotropes are often necessary, stable BP necessary with loss of cerebrovascular autoregulation Correct metabolic acidosis Maintain normal electrolytes and glucose often hyper then hypoglycemic, hyponatremia common
28 Management, cont. In the neonatal period, cont. Prevention of cerebral edema avoid fluid overload. Often have to restrict fluids to 60ml/kg/d, can decrease to 50ml/kg/d. Control of seizures Phenobarbital is the first choice: loading dose of 20mg/kg IV. If unresponsive, 5mg/kg doses up to 40mg/kg. If unable to control seizures with Phenobarbital start Ativan (lorazepam) 0.1mg/kg/dose repeat as necessary to control.
29 Seizures Can occur with HIE One of the most common signs of neurological dysfunction Can occur very early, even before the second phase postnatally Diagnosis can be challenging, as many as 80% of infants have clinical signs that are subtle or absent Must be distinguished from Jitteriness: usually normal eye movement, extremities are containable, fine movements Benign myoclonic activity: nonrepetitive, isolated jerky movements, generally occur during sleep Consider other causes: metabolic disturbances (hypoglycemia/ calcemia), inborn errors of metabolism, cerebral infarction, intracranial hemorrhage, infection (meningitis, TORCH, sepsis), neonatal drug withdrawal, developmental abnormalities
30 Seizures, cont. The earlier the onset the more ominous the prospects for recovery Important to recognize: Seizure activity can further damage the brain Suggestive of serious illness/injury which needs careful management Subtle seizure activity requires astute observation Obtain EEG as soon as practical Initiate aeeg immediately Seizures that occur as a result of HIE can be even more difficult to identify because many of these infants require intubation and paralytics > further mask clinical signs of seizure activity
31 Seizures-- Pathophysiology Neurons are depolarized by an inward migration of sodium They are repolarized by an efflux of potassium. Seizures occur due to excessive depolarization which results in excessive synchronous electrical discharge.
32 Seizures Pathophysiology, cont. Volpe (2001) proposed four possible reasons for the excessive depolarization Failure of the sodium-potassium pump secondary to a disturbance of energy production. Relative excess of excitatory vs inhibitory neurotransmitter. Relative lack of inhibitory vs excitatory neurotransmitter. Alteration in the neuronal membrane resulting in an inhibition of sodium movement
33 Seizure activity in 4 day old with HIE (ScienceDirect)
34 Seizures: Subtle & Clonic Subtle Apnea Staring, eyelid fluttering Sudden VS changes: BP fluctuations, tachycardia Cycling Most common type in preterm infants Clonic Multifocal: rhythmic, repetitive movement of one or two extremities that migrate to others in a non-orderly fashion Focal: rhythmic, repetitive movement of one extremity
35 Seizures: Tonic & Myoclonic Tonic Decerebrate or decorticate posturing Decerebrate: extremities are stiff and extended Decorticate: rigidly still with arms flexed, wrists clenched and legs extended Eye signs, occasional clonic movements Myoclonic Single or multiple jerky movements with flexion of upper or lower limbs Rare in neonates, but seen occasionally in metabolic problems
36
37 Management Assure adequate airway/ventilation Close CRM/oximetry monitoring Access for anticonvulsants Stat glucose, calcium, sodium and magnesium levels
38 Therapeutic Hypothermia! Research has shown that hypothermia can be neuroprotective May modify cells programmed for apoptosis, leading to their survival Reduced metabolic rate Decreased excitotoxicity Decreased edema Reduced alterations in ion flux 38
39 Therapeutic Hypothermia! Currently, two forms of cooling: selective head cooling total body cooling Protocols have been developed specific to each method and institution Infants who meet cooling criteria which is defined in each protocol cooled to C within 6 hours after birth maintained at that temperature for 72 hours followed by a slow rewarming process 39
40 Selective Head Cooling Study pictures from the Children s Hospital, Denver
41 Total Body Cooling
42 CoolCap Study Group 234 term infants with moderate to severe neonatal encephalopathy and abnormal EEG randomized to control or study group Head cooling was initiated within 6hrs and continued x 72hr when infant was gradually rewarmed Infants were cared for on a radiant warmer with temp adjusted to maintain rectal temp of degrees CoolCap water temp started at 8-12 degrees Outcomes no change in those with the most severe EEG changes, but beneficial to those less effected
43 Cochrane Review 2013 Systematic review of 11 randomized trials (n=1505) found that therapeutic hypothermia is beneficial in term and late preterm infants with HIE Found that cooling reduces mortality without increasing major disability in survivors and outweigh the short-term adverse effects Further trials should take place to determine the best techniques for cooling, patient selection, duration to help better understand this intervention
44 Seattle Children s Protocol Now encouraging cooling of eligible infants prior to and during transport Core/rectal temp goal 33.5C (check q15min) Passive cooling only Start prophylactic antibiotics Adequate sedation (avoid shivering) with morphine Phenobarbital for clinical seizures only Monitor electrolytes closely Avoid over ventilation and oxygenation
45 Seattle Children s cooling criteria Inclusion 36wk GA Perinatal depression based on one or more of the following: APGAR 5 at 10min need for resuscitation at 10 min cord ph <7 or arterial ph <7 within 1hr of birth Base deficit 12 in cord or blood gas within 1hr of birth Moderate to severe encephalopathy based on one of more of the following: Lethargy, stupor or coma, hypotonia Abnormal reflexes including oculomotor or pupillary abnormalities Absent or weak suck Clinical seizures or hyper-alert state
46 Seattle Children s cooling criteria, cont. Exclusion IUGR (BW < 1.8kg) Microcephaly (OFC <2SD for GA) Infant older than 6-12 hrs of age Infant likely to die or for whom withdrawal of care is being considered
47 Selected References Jacobs, S. E., Berg, M., Hunt, R., Tarnow-Mordi, W. O., Inder, T. E., & Davis, P. G. (January 01, 2013). Cooling for newborns with hypoxic ischaemic encephalopathy. The Cochrane Database of Systematic Reviews, 1.. Gluckman, et al Lancet 365: Gomella, T. Neonatology: management, procedures, on-call problems, diseases and drugs. McGraw-Hill Companies, Inc Fanaroff, A. & Martin, R. Neonatal-Perinatal Medicine: Diseases of the Fetus and Infant 7 th edition. Mosby, 2002.
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