Neonatology Ultimate Exam Guide

Lecture 1: Introduction to Pediatrics

Pediatrics: Derived from Greek word pedia (child), Iatrike (treatment), ics (branch of sciences).
Neonate: ≤ 28 days.
Infant: 1 month - 1 year.
Toddler: 1-3 years | Pre-school: 3-6 years | School age: 6-12 years | Adolescent: 12-18 years.
Still birth: Fetus born with no signs of life ≥ 24 weeks of pregnancy.
Perinatal mortality rate: Still birth + deaths within the first week per 1000 live births.
Neonatal mortality rate: Death of live born baby (infant) within the first 4 weeks of age per 1000 live births.
Preterm (Premature): Gestation < 37 weeks of pregnancy.
Term: 37-41 weeks of gestation.
Post term: Gestation ≥ 42 weeks of pregnancy.
Low Birth Weight (LBW): < 2500 gm.
Very Low Birth Weight (VLBW): < 1500 gm.
Extremely Low Birth Weight (ELBW): < 1000 gm.
Small for Gestational Age (SGA): Birth weight < 10th centile for gestational age.
Large for Gestational Age (LGA): Birth weight > 90th centile for gestational age.
Dysmature: Loss of subcutaneous fat and muscles.

Communication: Make friends, avoid dominating, do short mock exams (e.g., auscultating mother's hand). Start at non-threatening area (hand/knee). Explain what you do. Don't ask permission as it may be refused.
Personal Data: Name, Age (if <2 years write in months), Sex (X-linked diseases males more severe), Residence, Date of admission, Informant.
Chief Complaint: Use patient's words (e.g., frequent bowel motion for diarrhea, abnormal body movements for fit).
History of Present Illness (HPI):
- Pre-hospitalization: Onset, nature, location, radiation, relieving/aggravating factors. Always ask about: Appetite, feeding, activity, sleep. What happened before admission (medications, duration of treatment, response).
- Hospitalization: Investigations taken, medications, received blood/plasma, progress of illness.

GIT: Swallowing difficulties. Vomiting (projectile or not, color: bile, blood, clots). Abdominal pain. Diarrhea (consistency, mucous, blood, malodourous, floating on water). Constipation (appearance of feces). Jaundice (color of urine/stool, itching). Rectal bleeding (timing with defecation).
Respiratory: Shortness of breath (exercise induced, nocturnal or diurnal, breath holding). Cough (dry/moist, swallowed or expectorated sputum, blood-stained, worse at day/night, disturb sleep). Hemoptysis.
Cardiovascular: Fainting attacks, cyanosis, squatting, palpitation, breathlessness on exertion.
Genitourinary: Urgency, frequency, dysuria, nocturnal enuresis, hematuria.
Neurological: Fit (preceding fever, state before/after, type of movement, up-rolling of eyes, frothy secretion, incontinence). Headaches, anosmia, paresthesia.
Musculoskeletal: Limp, joint pain, swelling, skin rash.

Past History - Perinatal: Prenatal (maternal DM, HTN, hemorrhage, x-ray, smoking). Natal (mode of delivery NVD or CS and cause, types of anesthesia, prolonged rupture of membrane). Postnatal (term/preterm, cried immediately, NCU admission, meconium stained liquor, passed urine/meconium in 1st day).
Past Medical/Surgical: Hospital admissions, atopy (dermatitis, rhinitis), communicable diseases, blood transfusions, operations (circumcision).

Vaccination (Iraq 2017):

Age	Vaccines Given & Routes
0 - 1 week	Hep B (I.M thigh), BCG (Intradermal, upper 1/3 left deltoid), OPV (oral 2-3 drops)
2 Months	Hexavalent (DTaP, Hep B, HiB, IPV), OPV 1, Rotarix 1, PCV 13
4 Months	OPV 2, Rotarix 2, PCV 13, Pentavalent (DTaP-Hib-IPV)
6 Months	Hexavalent, OPV 3, PCV 13
9 Months	Measles (Subcutaneous), Vitamin A 100,000 IU
15 Months	MMR 1 (Subcutaneous)
18 Months	OPV 4, Pentavalent, MMR 2, Vitamin A 200,000 IU
4-6 Years	OPV, MMR 2, Quadrivalent (DTaP-IPV)

Feeding Requirements: Caloric requirement for <1 year = 120 kcal/kg/day. Note: 1 ounce = 28 ml = 20 kcal.
Feeding Frequency: Birth-2wks: every 2 hrs. 2wks-3ms: every 3 hrs. >3ms: every 4 hrs. Solid food started at 6th month (one type at a time, no added salt/sugar).
Family/Social History: Consanguinity (risk doubles 6-8% for first cousins), TB, asthma, parental occupation, socioeconomic state, animals, smoking.

Gross Motor: Newborn: flexed. 6-8wks: raise head 45°. 6-8m: Sit without support. 8-9m: crawling. 10m: walk around furniture. 12m: walk unsteadily. 15m: walk steadily.
Fine Motor: 6wks: follow moving objects. 4m: reach out. 6m: transfer object hand to hand + palmar grasp. 10m: pincer grip. 14m: scribbles.
Pencil Skills: Circle (3y), Cross (4y), Square (4.5y), Triangle (5y).
Building Bricks: Tower of 3 (18m), Tower of 6 (2y), Tower of 8 (2.5y).
Social/Behavioral: 6wks: smile responsively. 10m: waves bye bye. 12m: drinks from cup. 2y: dry by day, pulls off clothes. 3y: interactive play.
Speech: Newborn: startles. 3m: coos/laughs. 7-10m: dada/mama. 12m: 2-3 words. 18m: show 4 parts of body. 20-24m: 2-3 words simple phrases. 2.5-3y: 4-word sentences.

Perinatal vs Neonatal Mortality: Perinatal includes still births (≥ 24 wks) + 1st week deaths. Neonatal is live births dying in the first 4 weeks.
Preterm vs Term vs Post-term: Preterm is strictly < 37 weeks. Term is 37-41 weeks. Post-term is ≥ 42 weeks.
Vaccine Routes: BCG is strictly Intradermal (left deltoid). Hep B is Intramuscular (thigh). Measles/MMR is Subcutaneous.
Milestones to never forget: Pincer grip = 10 months. Circle = 3 years. Triangle = 5 years.
Caloric Rule: Infants < 1 year strictly need 120 kcal/kg/day. Remember 1 ounce = 20 kcal = 28 ml for calculations.

Lecture 2: Neonatology 1 (Assessment & Prematurity)

Neonatal Periods: Period I (<24hr), Period II (24hr - <7 days), Period III (7 days - <28 days).
Apgar Score Timing: Assessed at 1, 5 & 10-20 min after delivery. Evaluates: Appearance (Color), Pulse (HR), Grimace (Reflex irritability), Activity (Muscle tone), Respiration.
3 Qs at Birth: Term? Breathing or crying? Muscle tone?
Normal Vitals: Temp normal, HR 120-160, RR 40-60, BP 80/50, Head Circumference 35cm, Length 50cm, Weight 3-3.5kg.
Gestational Age: Time elapsed between 1st day of last menstrual period (LMP) and day of delivery.

Color/Skin: Plethora, Jaundice, Pallor, Cyanosis. Mottling in cold/sepsis. Persistent mottling (cutis marmorata) → think Down's syndrome.
Erythema toxicum: red skin with yellow-white papule.
Candida Albicans: Erythematous plaques with demarcated edge (skin folds involved). Milia: sebaceous retention, disappear in weeks.
Nevi: Macular hemangioma (stork bites): on occipital/eyelids, disappear.
Port-wine stain: doesn't blanch/disappear, rule out Sturge-weber syndrome.
Strawberry hemangioma: regresses by 7 yrs (70%). Cavernous hemangioma: regresses.
Head Trauma/Deformity:
- Molding: temporary asymmetry, resolves in 1st week.
- Caput succedaneum: Diffuse edema, extends across suture lines, resolves in several days.
- Cephalhematoma: Sub-periosteal hemorrhage, never extends suture line, resolves in 6wks.
ICP Signs: Bulging fontanel, separated sutures, Setting Sun sign (prominent scalp veins). Craniosynostosis: premature closure of sutures.
Eyes: Check red reflex, Brushfield spots, sub-conjunctival hemorrhage.
Mouth: Ranula (cystic swelling floor of mouth). Epstein pearls (cyst with keratin). Natal teeth. Macroglossia (Beckwith's, Pompe's, Hypothyroidism). Frothy saliva (Esophageal Atresia/TEF). Thrush (white mucous membrane).
Abdomen: Omphalocele (covered by umbilical ring membrane) vs Gastroschisis (anterior abdominal wall, uncovered).
Excretions: Meconium must pass within 48 hrs; Urine within 24hrs.
Nerve Palsies: Erb-Duchenne (C5-C6, waiter tip/policeman hand). Klumpke's (C7-C8, flaccid hand).
Primitive Reflexes: Rooting, grasp, moro, stepping, tonic neck reflex. Hip: Barlow's, Ortolani's.

Prematurity: Live born before 37 weeks from LMP. LBW = <2500g, VLBW = <1500g, Extreme LBW = <1000g.
Assessment of Gestational Age:
- New Ballard score (Physical criteria): skin, lanugo, plantar surface, breast, eye/ear, genitals.
- Neuromuscular criteria: posture, square window (wrist), arm recoil, popliteal angle, scarf sign, heel to ear.
- Rapid visual: Sole creases, breast nodule size, hair/skin nature, ear lobe, genitalia.
- Direct ophthalmoscopy: Grade 4 (27-28wks) down to Grade 1 (33-34wks).
Causes of Prematurity:
- Fetal: distress, multiple gestation, erythroblastosis, non-immune hydrops.
- Placental: dysfunction, previa, abruption.
- Uterine: bicornuate uterus, incompetent cervix.
- Maternal: pre-eclampsia, chronic medical illness, malnutrition, infections (L. monocytogenes, UTI, Group B strep, bacterial vaginosis), cocaine, smoking.
- Others: premature rupture of membrane, polyhydramnios, iatrogenic.
Prematurity Complications:
- Early: RDS, Jaundice, IVH, Anemia.
- Late: ROP, Chronic Lung Disease (CLD/BPD), Anemia, Rickets, CNS damage.
- Systems: Respiratory (RDS, apnea, hemorrhage), CVS (PDA, hypotension), Hematologic (DIC, Vitamin K def), GIT (NEC), Metabolic (Hypo-Ca, Hypoglycemia, Hypothermia), CNS (IVH, HIE, Kernicterus, Deafness), Renal (RTA, edema, electrolyte imbalance).

Definition: SGA = IUGR below 10th centile for weight.
Weights by week: 28wks = 1.1kg, 32wks = 1.5kg, 34wks = 2.2kg, 36wks = 2.5kg.
Types of IUGR:
- Symmetrical (20%): Starts early < 25 wks. Impairs all body structures (brain/organs). Small Ht, Wt, Head circumference. Causes: Chromosomal, congenital, TORCH infections. Not correctable, poor prognosis.
- Asymmetrical (80%): Starts late > 24 wks. Low length and Wt but sparing of head growth (large head compared to body). Causes: Placental insufficiency, maternal malnutrition/disease. Treated by treating maternal cause.
Causes of SGA: Fetal (chronic infection, radiation, multiple gestation), Placental (infarction, twin-transfusion), Maternal (Toxemia, hypoxemia, malnutrition, SICKLE CELL ANEMIA, drugs/cocaine/smoking).
Problems of SGA: Intra-uterine fetal demise, Perinatal asphyxia (↓ uteroplacental perfusion, meconium aspiration), Hypoglycemia (↓ glycogen, hyperinsulinism), Polycythemia - hyperviscosity (fetal hypoxia → ↑ erythropoietin), Reduced O2 consumption/Hypothermia, Dysmorphology.

Caput vs Cephalohematoma: Caput = Edema that CROSSES suture lines. Cephalohematoma = Hemorrhage that NEVER CROSSES suture lines.
SGA Types: Symmetrical (Early <25wks, chromosomal/TORCH, entire body small, bad prognosis). Asymmetrical (Late >24wks, placental insufficiency, Head is SPARED/Large relative to body).
Key Oral Signs: Frothy saliva ALWAYS suspect Esophageal Atresia/Tracheoesophageal Fistula (TEF).
Skin Signs: Persistent mottling (cutis marmorata) = rule out Down Syndrome. Port-wine stain = rule out Sturge-Weber syndrome.
Complications of Prematurity (Early vs Late): Early = RDS, IVH. Late = ROP, CLD, Rickets.

Lecture 3: Neonatology 2 (LGA, Post-Term, NEC, MAS)

LGA Definition: Weight high for gestational age, > 90-95th centile. Neonatal mortality rate ↓ with ↑ weight until 4000g, after which mortality ↑.
Predisposing Factors (Macrosomia): Maternal DM, Male, Prolonged gestation, Maternal obesity, Multiparity, maternal weight gain. Correlates poorly with late delivery, but closely with large parents or DM.
Problems of LGA:
- Birth injury: Shoulder dystocia, cervical/brachial plexus injury, phrenic nerve damage, fractured clavicle, cephalhematoma, subdural hematoma, IVH, asphyxia.
- Intellectual & developmental retardation.
- Jaundice and Hypoglycemia (even if mother is not diabetic).
Post-term Infant: Born after 42 weeks calculated from LMP (>280 days by 7 days or more).
Post-term Manifestations: ↑ birth weight, absence of lanugo hair, ↓ or absence of vernix caseosa, long nails, abundant scalp hair, desquamating (parchment-like) skin, ↑ alertness.
Placental Insufficiency in Post-term: Amniotic fluid & fetus meconium stained. Growth ↓ (IUGR). 20% of placental insufficiency are post-mature → loose skin, meconium-stained nails/skin/vernix/cord.
Prognosis/Treatment: Mortality ↑ 3x if delayed 3 weeks beyond term. Treatment: CS or induction, symptomatic Rx (HIE, MAS).

Definition: Disease of ill premature infants. Mucosal or trans-mural necrosis of intestine. Rarely occurs in term infants. Incidence 1-5% in neonatal units.
Pathology/Pathogenesis: Necrotic segment → gas accumulation in submucosa → Pneumatosis Intestinalis. Necrosis progress → perforation → sepsis → death. Mostly involves distal ileum and proximal colon. Infectious agents (Clostridium, E.coli, Staph, Rotavirus) but mostly no pathogen identified.
Risk Factors: Perinatal asphyxia, Catheter-related, Polycythemia, Hypotension, Immature immune system, Hypertonic milk / rapid feeding, Formula feeding (absence of IgA).
Clinical Signs: Onset 1st 2 weeks (up to 3 months in VLBW). First sign: Abdominal distention with gastric retention (appears after enteric feeding starts). Obvious bloody stool (25%). Insidious onset, sepsis suspected. Can progress rapidly to shock.
Bell's Stages:
- Stage I (Suspected): Apnea, lethargy, emesis, mild distention, bloody stool. Normal X-Ray or mild ileus.
- Stage II (Proven): Absent bowel sounds, tenderness. X-Ray: Pneumatosis intestinalis, portal venous gas.
- Stage III (Advanced): Shock, DIC, generalized peritonitis. X-Ray: Definite ascites, Pneumoperitoneum.
Diagnosis: Clinically, CBP, stool occult blood, Blood gas (Metabolic acidosis & hypoxia). X-Ray: Pneumatosis Intestinalis (gas in bowel wall), Pneumoperitoneum (perforation). US: intra-hepatic portal gas.
Treatment (Medical): NPO (strict bowel rest), N/G tube, Vital monitoring, Ampicillin + Gentamicin (after culture), remove umbilical catheter, IVF (blood/plasma), Isolation. 20-40% medical failure.
Treatment (Surgical): Indicated for intestinal perforation or no response to medical Rx. Massive resection → Short bowel syndrome. Mortality 10-30%.
Prevention: Judicious feeding, Probiotics, Breast feeding.

Seen in 5-15% of births, usually Term and Post-term infants. 5% develop pneumonia (30% need vent, 3-5% expire).
Pathogenesis: Fetal hypoxia/asphyxia → in-utero gasping → meconium aspiration. Post-dates → physiological meconium aspiration. Leads to: 1. Airway obstruction 2. Chemical pneumonitis.
Clinical Manifestations: Respiratory distress within 1st hr. Tachypnea, retractions, grunting, cyanosis. Partial obstruction → Pneumothorax or Pneumo-mediastinum.
X-Ray Findings: Patchy infiltration, coarse streaking of both lungs, flattening of the diaphragm (hyperinflation).
Management: Prevention by suctioning oro-pharynx BEFORE first breath. Thin meconium with Apgar > 8: no need for Rx. Thick meconium/depressed: NRP resuscitation. Exogenous surfactant ↓ need for ECMO. Refractory cases need HFV, iNO, or ECMO.
Prognosis: Mortality higher than non-stained. Depends on CNS injury/PHTN. May have symptomatic cough/wheeze/hyperinflation for up to 5-10 years.

Post-term Skin: Parchment-like, desquamating skin with absent lanugo and vernix. Suspect placental insufficiency if meconium stained.
LGA / Macrosomia: Watch out for shoulder dystocia, clavicle fractures, and severe HYPOGLYCEMIA/JAUNDICE even in non-diabetic mothers.
NEC Hallmark: Pneumatosis Intestinalis on X-ray. Initial sign is abdominal distention + gastric residuals after starting feeds.
NEC Surgery Indication: Pneumoperitoneum (indicates bowel perforation). Immediate NPO and antibiotics are 1st step.
MAS X-Ray: Patchy infiltrates + Flattened diaphragm (hyperinflation). Commonly causes Pneumothorax due to ball-valve obstruction.

Lecture 4: Respiratory Distress in Newborn (RDS & TTN)

Definition: Primarily a disease of Prematurity due to Surfactant deficiency (produced by Type II alveolar cells). Persists/progresses over first 48-90 hrs. 30% of neonatal deaths.
Incidence: 60-80% in <28 wks. 15-30% in 32-36 wks. 5% >37 wks.
Risk Factors (↑): Infant of Diabetic Mother (IDM), preterm, multiple gestation, C-section, precipitous delivery, asphyxia, cold stress, white male, acidosis, family history.
Protective Factors (↓): Chronic HTN, maternal opiate addiction, prolonged ROM (rupture of membranes), Antenatal Corticosteroids.
Pathophysiology: Surfactant prevents end-expiratory collapse. Matures >35wks (L:S ratio ≥ 2:1). Deficiency → Atelectasis (perfused but not ventilated) → Hypoxia & Hypercapnia → Acidosis → pulmonary vasoconstriction → ischemia → effusion of eosinophilic proteinaceous material (Hyaline Membrane).
Clinical Signs: Appear within minutes/hours. Tachypnea (>60/min), grunting, inter/sub-costal retractions, nasal flaring, duskiness/cyanosis. Apnea and irregular respiration are ominous signs. Symptoms peak at 3 days. Death 2-7 days from air leaks/IVH.
Diagnosis: CXR: Fine reticular granularity (Ground glass) and Air bronchogram (micro-atelectasis). Blood gas (mixed resp/metabolic acidosis).
Differential Dx: Group B Strep pneumonia (mimics RDS exactly), Cyanotic HD, PPHN, MAS, Pneumothorax, TTN, Diaphragmatic hernia.
Prevention: Avoid poorly timed CS. Antenatal Dexamethasone 48 hrs before delivery (24-34 wks). First dose of surfactant prophylactically.
Treatment: Temp 36.5-37°C. IVF. Warm humidified O2 (CPAP to keep O2 55-70 mmHg). Assisted vent if CPAP fails. Exogenous Surfactant via ET tube. Vitamin A (to ↓ BPD/ROP). Systemic/inhaled steroids. iNO. Bicarbonate. Dopamine for ↓BP. Empirical Antibiotics (Ampicillin + Aminoglycosides) until Group B Strep is ruled out.
Complications: Intubation injury (sub-glottis stenosis), Catheter injury, Air leaks, PDA, BPD (Chronic Lung Disease), NEC, IVH, ROP.

Definition: Due to delayed lymphatic absorption of fetal lung fluid. Usually follows normal preterm or term vaginally delivered or C-section.
Risk Factors: C-section, male, macrosomia, excessive maternal sedation, prolonged labor, negative amniotic phosphatidylglyceride, Apgar < 7 at 1m.
Clinical: Early tachypnea, retractions, expiratory grunting, cyanosis. Relieved by minimal O2 < 40%. Rapid recovery within 3 days. Baby is NOT severely ill.
Diagnosis: CXR shows prominent perihilar streaking, increased lung volume (over inflation), fluid in minor fissures/pleural space. Absence of reticulogranular pattern or air bronchogram.
Malignant TTN: Refractory hypoxia needing ECMO due to pulmonary hypertension. Hypoxemia, hypercapnia, and acidosis are usually UNCOMMON in normal TTN.

RDS hallmark: Prematurity + Ground glass appearance (reticulogranular) + Air bronchograms on CXR.
Group B Strep vs RDS: GBS pneumonia is clinically and radiologically indistinguishable from RDS; ALWAYS give empirical Ampicillin + Aminoglycoside.
L/S Ratio: Lecithin to Sphingomyelin ratio ≥ 2:1 at 35 weeks indicates mature lung surfactant.
TTN hallmark: C-section delivery + Prominent perihilar streaking + Fluid in fissures + Overinflation on CXR. Resolves rapidly in 3 days.
Maternal Stress Protective Effect: Chronic HTN, prolonged ROM, and opiate addiction paradoxically ACCELERATE fetal lung maturation, decreasing RDS risk.

Lecture 5: Birth Injury (HIE & Mechanical Trauma)

Etiology (Hypoxia): Maternal (HTN/disease, low BP, excess oxytocin, Cocaine use → vasoconstriction). Placental (insufficiency, abruption). Fetal (cord prolapse). Post-delivery (shock, apnea).
Pathophysiology: Hypoxia → ↑ catecholamines (transient ↑ BP/HR then ↓) → shunting blood to brain/heart/adrenals. Anaerobic metabolism → ↑ Lactate. Glutamate accumulates. Intracellular Na/Ca accumulation → Cerebral Edema & Cell death. Free radicals + NO release.
Organ Involvement: CNS (edema, hemorrhage), Heart (infarction), Lungs (PHTN, RDS), GIT (ulcer), Renal (tubular necrosis), Adrenal (hemorrhage), Metabolic (Hypocalcemia, Hypoglycemia, SIADH).

Sarnat Clinical Staging:

Feature	Stage I (Mild)	Stage II (Moderate)	Stage III (Severe)
Consciousness	Hyperalert	Lethargic / Obtunded	Stupor or Flaccid coma
Muscle Tone	Normal	Mild hypotonia	Flaccid/Rigid, decerebration
Reflexes (Moro)	Strong	Weak/Incomplete	Absent
Autonomic (Pupils)	Dilated, Tachycardia	Constricted (Miosis), Bradycardia	Fixed, dilated, Variable HR
Respiration	Regular	Periodic breathing	Apnea (No spontaneous)
Seizures	None	Common	Uncommon (excluding decerebration)

Diagnosis: Sentinel event, Apgar ≤ 5 at 10 min, need for active resuscitation at 10m. Blood gas at 1hr: pH < 7.0, Base deficit > -16 mmol/L. ↑ Creatinine, ↑ LFTs. MRI (Diffusion-weighted): loss of signal in posterior limb of internal capsule, ↑ signal in basal ganglia. US for preterm.
Treatment: Therapeutic Hypothermia (whole body/cerebral cooling to 35.5°C within 1st 6 hours) reduces apoptosis. Seizure control: Phenobarbital (drug of choice, 20 mg/kg load up to 40-50mg/kg). Phenytoin/Lorazepam for refractory.
Prognosis: 15-20% die. 25-30% permanent damage (CP, MR). Term → Cortical necrosis (cortical atrophy). Pre-term → Periventricular Leukomalacia (PVL) → spastic diplegia, and IVH.

Caput Succedaneum: Diffuse, ecchymotic edematous swelling of scalp. Crosses suture lines. Resolves within first few days. Associated with molding. No treatment needed.
Cephalohematoma: Sub-periosteal hemorrhage. Does NOT cross suture lines (limited to one bone). Appears hours after birth. Resolves in 2 weeks to 3 months (may calcify). Risk of jaundice. Incision and drainage are CONTRAINDICATED (infection risk).
Brachial Palsy (Erb-Duchenne): Injury to C5-C6. Arm adducted, internally rotated, forearm pronated (Waiter's tip / Policeman hand). Absent Moro, absent biceps reflex, but grasp reflex is PRESERVED (good prognostic sign). May involve phrenic nerve.
Brachial Palsy (Klumpke): Injury to C7-C8 & T1. Paralyzed hand (loss of grasp reflex). Moro is maintained. Ipsilateral Horner Syndrome (ptosis & miosis) if T1 involved.
Facial Palsy: Peripheral paralysis due to forceps or pressure in utero. Usually resolves. Can be central (nuclear agenesis).

HIE Diagnostic Blood Gas: Cord pH < 7.0 and Base Deficit > -16 mmol/L are classic for severe asphyxia.
HIE Golden Window: Therapeutic hypothermia to 35.5°C MUST be started within the first 6 hours of life to prevent apoptosis.
Sarnat Stage II vs III: Stage II features seizures and constricted pupils. Stage III features flaccidity, apnea, and fixed dilated pupils (seizures are uncommon in stage III).
Premature vs Term HIE: Term baby gets Cortical Necrosis. Preemie gets Periventricular Leukomalacia (PVL) → Spastic Diplegia.
Erb's Palsy Grasp Reflex: The GRASP reflex is preserved in Erb-Duchenne (C5-C6) but ABSENT in Klumpke (C7-T1).

Lecture 6: Neonatal Seizures

Definition: Incomplete arborization, myelination, and delayed inhibitory GABA make neonatal seizures dissimilar to adults. They are emergencies preventing brain injury.
Clinical Types:
1. Focal clonic: Rhythmic jerking, common in full term, consciousness maintained.
2. Multifocal clonic: Sequential/simultaneous involvement of multiple limbs.
3. Tonic: Rigid posturing, commonly affects premature.
4. Myoclonic: Brief focal/generalized jerks (distal muscles).
5. Subtle: Chewing, salivation, apnea, bicycling/pedaling, blinking, nystagmus, color change.
Non-epileptic Activity (Jitteriness): No autonomic changes (no ↑ HR/BP), suppressed by gentle restraint, enhanced by sensory stimuli, no eye movement.
EEG Classification:
- 1- Consistent EEG event: True epileptic (focal tonic/clonic).
- 2- Inconsistent EEG event: Likely non-epileptic (generalized tonic, subtle). May not respond to AEDs.
- 3- Electrical without clinical: Comatose infants, or after AEDs stop clinical signs but EEG remains abnormal.

Causes:
1. HIE (Hypoxic-Ischemic Encephalopathy): Most common cause (50-60%), occurs within 12 hours.
2. Vascular Events (10-20%): IVH, SAH, Subdural. Venous sinus thrombosis (needs MR/CT Venography).
3. Infections (5-10%): Meningitis, TORCH.
4. Brain Malformations (5-10%): Lissencephaly, Agenesis of corpus callosum (Aicardi).
5. Drugs / Withdrawal / Anesthesia injection.
6. Inherited / Metabolic: Tuberous sclerosis, Zellweger, Pyridoxine dependency, MSUD. Hypoglycemia, Hypocalcemia, Hypomagnesemia, Hyponatremia.
Diagnosis: History, PE (fontanels, retina, dysmorphic). Labs: Glucose, Ca, Mg, Na, Blood gas, Ammonia. Lumbar puncture is indicated in ALL neonates with seizure. US, EEG, MRI.

Step 1: Treat underlying cause (Glucose, Calcium, Mg).
Step 2: Anticonvulsants (AEDs):
- Phenobarbital: Drug of FIRST choice. Loading dose: 20 mg/kg IV. If ineffective, add 5-10 mg/kg until 40-50 mg/kg is reached (may need vent). Maintenance: 3-6 mg/day.
- Phenytoin / Fosphenytoin: Load 15-20 mg/kg. Phenytoin causes cardiac toxicity. Fosphenytoin is safer, water soluble (IV/IM).
- Diazepam / Midazolam: Diazepam rapid entry/clearance. Risk of recurrence, apnea & hypotension (max 2mg). Midazolam continuous infusion 0.5-2 µg/kg/min.
- Lorazepam: Lasts longer (6-24h), does NOT cause ↓ BP or apnea. Dose 0.02-0.1 mg/kg.
Prognosis: Hypoglycemia/Hypocalcemia → Excellent. Severe HIE/cyto-architectural anomalies → intractable seizures → Death/Poor. Delayed diagnosis → irreversible damage.

Seizure vs Jitteriness: Jitteriness is stopped by holding the limb (restraint) and has NO abnormal eye movements or tachycardia. True seizures are not stopped by restraint.
Most common cause of Seizures: HIE (Hypoxic-Ischemic Encephalopathy), usually presenting within the first 12 hours of life.
First Line Drug: Phenobarbital (loading dose 20 mg/kg). If seizures persist, give more up to 40 mg/kg before switching.
LP Rule: A Lumbar Puncture (LP) is indicated in ALL neonates presenting with seizures to rule out meningitis.
Phenytoin toxicity: Phenytoin can cause cardiac toxicity; Fosphenytoin is the safer, water-soluble alternative.

Lecture 7: Neonatal Hyperbilirubinemia (Jaundice)

Indirect (Unconjugated): Lipid soluble, crosses BBB causing Kernicterus. Urine normal (urobilinogen), skin orange-yellow, normal stool. Causes: Hemolysis, Polycythemia, Enzyme absence (Crigler-Najjar, Gilbert), Prematurity, Hypothyroidism.
Direct (Conjugated): Water soluble, doesn't cross BBB, dark tea-colored urine, clay (white) stool, greenish-yellow skin. Indicates hepatic/systemic disease (Biliary atresia, TORCH, Sepsis, Galactosemia, Cystic Fibrosis).
Physiological Jaundice: Immature conjugation. Term: Appears 2-3 days, peaks 3-4 days (< 12 mg/dl), disappears 5-7 days. Preterm: peaks 4-7 days (< 14 mg/dl). Diagnosis of exclusion. Exaggerated by: Maternal DM, polycythemia, Downs, bruising, dehydration.
Pathological Jaundice Criteria (MUST investigate):
1. Appears in first 24-36 hours (Think Erythroblastosis/Hemolysis).
2. Rises faster than 5 mg/dl/day.
3. TSB > 12 mg/dl in term or >14 in preterm.
4. Persists beyond 10-14 days (Prolonged).
5. Direct bilirubin > 2 mg/dl (or >20% of total).
6. Signs of hemolysis, sepsis, kernicterus.
Prolonged Jaundice (>2 weeks): Hemolysis, Hypothyroidism, Breast milk, Pyloric stenosis, Biliary atresia, TORCH, Galactosemia.

Breast Feeding vs Breast Milk:
- Breast Feeding Jaundice: 1st week (13%), due to dehydration/poor caloric intake. Rx: frequent feeds (>10/day), avoid glucose water.
- Breast Milk Jaundice: Occurs after 7th day (2%) due to glucuronidase in milk ↑ enterohepatic circulation. Max 10-30 mg/dl. Rx: Interruption of breast milk for 1-2 days drops levels.
Rh Incompatibility (Erythroblastosis Fetalis):
- Mother Rh -ve, Baby Rh +ve (D antigen). Needs sensitization. IgG crosses placenta. Rarely affects 1st pregnancy.
- Signs: Massive hemolysis, organomegaly, Hydrops fetalis (anasarca, heart failure), Kernicterus. Jaundice absent exactly at birth (placental clearance) but rises rapidly within 24h. Thrombocytopenia, Hypoglycemia (islet hyperplasia).
- Dx: Hb 3-4 g/dl, High retic, Nucleated RBCs. Strongly Positive Direct Coombs Test. PUBS / Amniocentesis antenatally.
- Prevention: Anti-D IgG (300mg) to mother within 72 hrs. Intrauterine transfusion if PCV < 30%.
ABO Incompatibility:
- Most common. Mother O, Baby A or B. Can occur in 1st pregnancy (natural anti-A/B IgG).
- Usually milder. Spherocytes on blood film (DDx: hereditary spherocytosis). Weak/moderate Coombs test.

Kernicterus (Bilirubin Encephalopathy): Deposition of unconjugated bilirubin in Basal Ganglia & Brain stem. Risk ↑ with displacement from albumin (sulfisoxazole, acidosis, hypoglycemia, asphyxia). Very immature <1000g can get it at <10 mg/dl.
Clinical Stages:
- Phase 1 (1-2 days): Lethargy, poor feeding, loss of Moro.
- Phase 2 (mid 1st wk): Opisthotonos, bulging fontanel, high pitch cry, seizures.
- Phase 3: Hypertonia.
- Chronic (3rd year): Bilateral choreoathetosis, mental retardation, Sensorineural deafness, enamel dysplasia.
Phototherapy: Blue light (420-470 nm). Converts native bilirubin to water-soluble isomers excreted in urine/bile. Fluid intake must ↑ by 10-20%.
Exchange Transfusion: Double volume. Indications: Cord Hb ≤ 10 g/dl, Cord TSB ≥ 5 mg/dl, intensive phototherapy failure, or ANY signs of Kernicterus. Complications: Hypoglycemia, acidosis, NEC, volume overload, arrhythmias, death 0.3%.
Metalloporphyrin / IVIG: Inhibits heme oxygenase. IVIG (0.5-1g/kg) reduces need for exchange in ABO/Rh.

Direct vs Indirect: Direct bilirubin > 2 mg/dl means conjugated (hepatic/obstructive disease) and urine is dark tea-colored. Unconjugated can cross BBB causing Kernicterus.
First 24 Hours Rule: Jaundice appearing in the first 24 hours of life is ALWAYS pathological (Usually Hemolysis/Rh/ABO).
Breast Milk vs Feeding: Breast FEEDING jaundice = 1st week (due to dehydration). Breast MILK jaundice = After 7th day (due to glucuronidase in milk).
Blood Film Differentials: Spherocytes = ABO incompatibility (or Hereditary Spherocytosis). Polychromasia/Nucleated RBCs = Rh incompatibility.
Kernicterus Chronic Signs: Sensorineural deafness and Choreoathetosis are the classic permanent hallmarks of Kernicterus in the 3rd year of life.

Lecture 8: Common Neonatal Disorders

Hypoglycemia Definition: Glucose < 35 mg/dl (1-2h), < 40 mg/dl (3-24h), < 45 mg/dl (after 24 hrs).
Causes:
1. ↑ Insulin: Infant of Diabetic Mother (IDM), Beckwith syndrome, Erythroblastosis, Nesidioblastosis.
2. ↓ Glycogen stores: IUGR, Prematurity.
3. ↑ Metabolic needs: Asphyxia, Sepsis, Hypothermia, RDS.
4. Metabolic/Genetic: Galactosemia, GSD.
Symptoms: Jitteriness, tremors, cyanosis, seizures, apnea, high-pitched cry, sweating.
Treatment:
- Asymptomatic: Early breast feeding. Transient asymptomatic: IV 10% Dextrose at 4 mg/kg/min (GIR).
- Symptomatic (no seizures): Bolus 2 ml/kg of 10% Glucose (200mg/kg).
- Symptomatic (with seizures): Bolus 4 ml/kg of 10% Glucose (400mg/kg) -> continuous GIR 8 mg/kg/min.
- Refractory: 15-20% glucose, Hydrocortisone, Diazoxide/Glucagon. Surgery for Nesidioblastosis.
Hypocalcemia Definition: Total Ca < 7 mg/dl (with symptoms), or Ionized Ca < 3 mg/dl.
Presentation: Convulsions (most common CNS sign), tetany (carpopedal, laryngospasm), Trousseau/Chvostek signs. Prolonged Q-T interval on ECG.
Early Onset (< 72 hrs): Prematurity, SGA, IDM (high maternal calcitonin/low Mg), Asphyxia (high PO4 release), DiGeorge Syndrome.
Late Onset (5-10 days): High phosphate cow's milk formula, Prematurity on breast milk without Vit D/Ca, maternal low Vit D, renal dysfunction.
Treatment: 10% Calcium Gluconate (2 ml/kg IV) every 6-8 hrs. Monitor for extravasation, bradycardia.

Premature Instability: Immature thalamus center, lack of shivering, large surface area, lack of sweating, lack of brown fat.
Cold Injury (< 35°C): Apathy, edema, redness of extremities, sclerema. Leads to Hypoglycemia, Acidosis, Pulmonary hemorrhage, IVH. Rx: Rewarm slowly (0.5-1°C/hr). 10% brain damage in survivors.
Hyperthermia (Dehydration Fever): 38-39°C at 2-3 days. Low fluid intake or incubator overheating. Signs: depressed fontanel, hot/dry skin, hypernatremia (↑ Na, protein, Hct). Severe (41-44°C) causes shock/coma. Rx: Tepid water immersion, correct electrolytes.

Pathophysiology: Maternal hyperglycemia → Fetal hyperglycemia → Fetal hyperinsulinemia → ↑ weight of placenta & all organs EXCEPT the brain. Hyperinsulinemia causes hypoglycemia postpartum. Hyperglycemia is teratogenic.
Neonatal Problems:
- Hypoglycemia (1st few hours).
- Hypocalcemia & Hypomagnesemia (hyperexcitability).
- RDS: Insulin antagonizes cortisol, ↓ surfactant.
- Polycythemia & Renal Vein Thrombosis.
- Cardiac: Cardiomegaly (30%), Asymptomatic septal hypertrophic cardiomyopathy.
Congenital Malformations: VSD, ASD, TGA. Lumbosacral Agenesis & Small Left Colon Syndrome are highly specific. Renal agenesis, Situs inversus.
Management: Peri-conception & labor glucose control. Screen neonate at 1 hr. Treat hypoglycemia even if asymptomatic. Avoid bolus hypertonic glucose as it causes rebound hyperinsulinemia.

Hypoglycemia Rule: Bolus 2 ml/kg of 10% Dextrose if symptomatic (no seizure). Bolus 4 ml/kg if seizures are present. Maintenance is GIR 8 mg/kg/min.
ECG sign of Hypocalcemia: Prolonged Q-T interval. Treat with 10% Calcium Gluconate slowly while monitoring for bradycardia.
Late Hypocalcemia Cause: Feeding neonates with whole cow's milk (which contains high phosphate) leads to late-onset hypocalcemia (5-10 days).
IDM Organ Growth: In Infants of Diabetic Mothers, ALL organs undergo macrosomia (organomegaly) EXCEPT the brain.
IDM Specific Anomalies: Lumbosacral Agenesis and Small Left Colon Syndrome are the classic specific anomalies associated with maternal diabetes.

⚖️ Crucial Comparisons

Feature	Caput Succedaneum	Cephalohematoma
Definition	Diffuse edematous swelling of soft tissue	Sub-periosteal hemorrhage
Suture Lines	Crosses suture lines	Never crosses suture lines (limited to one bone)
Onset	Present at birth	Appears several hours after birth (slow process)
Resolution	Disappears within the first few days	Takes 2 weeks to 3 months (may calcify)
Complications	None specific	Hyperbilirubinemia (Jaundice), underlying skull fracture
Treatment	None needed	None. Incision/drainage is contraindicated

Feature	Symmetrical IUGR (20%)	Asymmetrical IUGR (80%)
Timing of Onset	Early (< 25 weeks gestation)	Late (> 24 weeks gestation)
Causes	Chromosomal, Congenital, TORCH infections	Placental insufficiency, Maternal disease/malnutrition
Physical Impact	All body structures impaired (Small length, weight, and head)	Sparing of head growth (Large head relative to small body)
Prognosis/Treatment	Not correctable → Poor prognosis	Treated by treating maternal cause → Better prognosis

Feature	Erb-Duchenne Paralysis	Klumpke Paralysis
Nerve Roots Injured	C5 - C6	C7 - C8 & T1
Clinical Posture	Waiter's tip / Policeman hand (Adducted, internally rotated arm)	Flaccid, paralyzed hand
Moro Reflex	Absent on affected side	Maintained
Grasp Reflex	Preserved (Good prognostic sign)	Lost
Associated Signs	Phrenic nerve damage (diaphragm excursion)	Horner Syndrome (Ptosis, Miosis) if T1 involved

Feature	Respiratory Distress Syndrome (RDS Type 1)	Transient Tachypnea of the Newborn (TTN / RDS Type 2)
Primary Cause	Surfactant deficiency	Delayed lymphatic absorption of fetal lung fluid
Typical Patient	Premature infant, Infant of Diabetic Mother	Normal Preterm or Term, C-section delivery
Severity & Course	Severe, peaks at 3 days, high mortality risk	Mild, rapid recovery within 3 days, baby not severely ill
X-Ray Findings	Ground glass appearance (reticulogranular), Air bronchograms	Prominent perihilar streaking, Overinflation, fluid in fissures
Treatment	Exogenous Surfactant, CPAP, Intubation	Minimal O2 (<40%), Supportive

Feature	Physiological Jaundice	Pathological Jaundice
Onset	2 - 3 days of life	First 24 - 36 hours of life
Rate of Rise	Slow (< 5 mg/dl/day)	Fast (> 5 mg/dl/day)
Max Peak (Term)	< 12 mg/dl	> 12 mg/dl
Duration	Disappears by 1 week (term) or 2 weeks (preterm)	Persists beyond 10 - 14 days
Direct Bilirubin	Normal	> 2 mg/dl (or >20% of total)

Feature	Rh Incompatibility (Erythroblastosis Fetalis)	ABO Incompatibility
Maternal / Fetal Type	Mother Rh -ve / Baby Rh +ve	Mother O / Baby A or B
First Pregnancy?	Rarely affected (requires prior sensitization)	Can occur in 1st pregnancy (natural IgG)
Severity	Severe (Hydrops fetalis, severe anemia)	Usually mild
Coombs Test	Strongly Positive	Weak to moderately positive
Blood Film	Polychromasia, Nucleated RBCs	Spherocytes

Feature	Epileptic Neonatal Seizures	Non-epileptic Activity (Jitteriness)
Autonomic Changes	Present (Tachycardia, ↑ BP)	None
Response to Restraint	Not suppressed by holding the limb	Suppressed by gentle restraint
Sensory Stimuli	Does not usually trigger/enhance	Enhanced by sensory stimuli
Eye Movements	Abnormal (Deviation, staring, nystagmus)	Normal / No abnormal eye movement

Feature	Indirect (Unconjugated) Hyperbilirubinemia	Direct (Conjugated) Hyperbilirubinemia
Solubility	Lipid soluble (Crosses BBB)	Water soluble (Cannot cross BBB)
Toxicity	Causes Kernicterus (Neurotoxic)	Indicates hepatic/systemic disease (Not neurotoxic)
Urine & Stool Color	Normal urine, normal stool	Dark tea-colored urine, Clay (white) stool
Skin Color	Orangish-yellow	Greenish-yellow
Major Causes	Hemolysis, Polycythemia, Prematurity, Enzyme defects	Biliary atresia, TORCH, Sepsis, Cystic Fibrosis

Feature	Breast Feeding Jaundice	Breast Milk Jaundice
Timing of Onset	1st week of life	After the 7th day of life
Cause	Dehydration / Decreased caloric intake	Glucuronidase in milk ↑ enterohepatic circulation
Incidence	Common (~13%)	Less common (~2%)
Management	Frequent feeds (>10/day), Avoid glucose water	Interrupt breast milk for 1-2 days (levels drop rapidly)

Feature	Early Onset Neonatal Hypocalcemia	Late Onset Neonatal Hypocalcemia
Timing	First 72 hours of life	5 - 10 days (up to 6 weeks)
Primary Causes	Prematurity, SGA, Infant of Diabetic Mother (IDM), Asphyxia, DiGeorge	High phosphate cow's milk formula, maternal low Vit D
Mechanism	Low PTH function, high maternal calcitonin, high PO4 from damaged cells	High phosphate suppresses calcium absorption

Neonatology Ultimate Exam Guide

Lecture 1: Introduction to Pediatrics

Lecture 2: Neonatology 1 (Assessment & Prematurity)

Lecture 3: Neonatology 2 (LGA, Post-Term, NEC, MAS)

Lecture 4: Respiratory Distress in Newborn (RDS & TTN)

Lecture 5: Birth Injury (HIE & Mechanical Trauma)

Lecture 6: Neonatal Seizures

Lecture 7: Neonatal Hyperbilirubinemia (Jaundice)

Lecture 8: Common Neonatal Disorders

⚖️ Crucial Comparisons

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