Comprehensive Study Notes on Neonatal Care and High-Risk Infants

High Risk Infant Definition: A neonate, regardless of size or weight, with a greater than average chance of morbidity or mortality, particularly within the first $28$ days of life.
Admission Criteria for Newborn Unit (NBU): Includes prematurity, low birth weight, asphyxia neonatorum, Respiratory Distress Syndrome ( $RDS$ ), Hemorrhagic disease of the newborn, congenital abnormalities, and maternal instability or death.
Infection Prevention: Critical due to low immunity. Strategies include the "5-Moments of Handwashing," restricted visitor traffic, isolation rooms for barrier nursing, and strict aseptic techniques during procedures.

Birth Weight Categories:
- Low-birth-weight ( $LBW$ ): $< 2500\,g$ ( $2499\,g$ and below).
- Very low-birth-weight ( $VLBW$ ): $< 1500\,g$ .
- Extremely low-birth-weight ( $ELBW$ ): $< 1000\,g$ .
Gestational Age Categories:
- Preterm: Born before $37$ complete weeks of gestation.
- Extremely preterm: $< 28$ weeks.
- Very preterm: $28$ to $32$ weeks.
- Moderate to late preterm: $32$ to $< 37$ weeks.
Clinical Assessment Tools: The Balard Score is used to determine gestational age clinically. The Silverman-Anderson Score assesses respiratory distress severity ( $1 - 3$ mild, $4 - 6$ moderate, $> 6$ impending failure).

Hypothermia: Axillary temperature below $36.5^{\circ}C$ . Heat loss occurs via evaporation, conduction, radiation, and convection.
The Warm Chain: Guidelines to maintain temperature including immediate drying, skin-to-skin contact, postponed bathing ( $> 24$ hours), and appropriate clothing ( $1 - 2$ more layers than an adult).
Hyperthermia: Temperature above $37.5^{\circ}C$ . Causes include incubator overheating, dehydration, or infection.
Kangaroo Mother Care ( $KMC$ ): Skin-to-skin contact for stable babies $< 2500\,g$ . Elements include position, nutrition (breastfeeding), and supportive environment.

Neonatal Apnoea: Cessation of breathing for $> 20$ seconds or shorter pauses with bradycardia/cyanosis. Management involves stimulation, Caffeine citrate, or Aminophylline.
Respiratory Distress Syndrome ( $RDS$ ): Caused by surfactant deficiency in premature lungs, leading to atelectasis. Management involves oxygenation and CPAP.
Meconium Aspiration Syndrome ( $MAS$ ): Intrauterine aspiration of stool causing airway obstruction and chemical pneumonitis. Known for the result of the "ball valve effect."
Glucose Disorders:
- Hypoglycaemia: Serum glucose below $2.6\,mmol/l$ .
- Hyperglycaemia: Blood glucose above $8.3\,mmol/l$ .

Definition: Failure to initiate and sustain spontaneous breathing at birth.
APGAR Score (devised by Dr. Virginia Apgar): Assessment of Appearance, Pulse, Grimace, Activity, and Respiration at $1$ , $5$ , and $10$ minutes.
- $8 - 10$ : Normal.
- $4 - 5$ : Moderate asphyxia (requires resuscitation).
- $0 - 3$ : Severe asphyxia (requires intensive measures/intubation).
Organ Impact: Can lead to Hypoxic Ischemic Encephalopathy ( $HIE$ ), Acute Kidney Injury ( $AKI$ ), and multisystem dysfunction.

Physiological Jaundice: Common in preterms; appears after $48$ hours and resolves in $7 - 10$ days. Bilirubin never exceeds $250\,\mu mol/l$ .
Pathological Jaundice: Appears within $24$ hours. Causes include $Rh$ / $ABO$ incompatibility, sepsis, or G6PD deficiency.
Kernicterus: Permanent brain damage caused by unconjugated (fat-soluble) bilirubin crossing the Blood-Brain Barrier ( $BBB$ ).
Treatment: Phototherapy (converting indirect bilirubin to water-soluble form) and Blood Exchange Transfusion.

Sepsis: Early onset ( $< 72$ hours) usually from the maternal genital tract; Late onset ( $> 72$ hours) usually nosocomial or community-acquired.
Meningitis: Inflammation of meninges; treated for $14$ days (Gram positive) or $21$ days (Gram negative) with antibiotics like Ceftriaxone.
Necrotizing Enterocolitis ( $NEC$ ): Life-threatening GIT necrosis in preterms. Features include abdominal distension, bile-stained vomitus, and pneumatosis intestinalis on X-ray.
Cord Care: Recommended use of $7.1\%$ Chlorhexidine for hygiene and prevention of infection.

Head Trauma: Caput succedaneum (serum swelling, crosses suture lines), Cephalohaematoma (blood between periosteum and skull bone, does not cross suture lines), and Subgaleal haemorrhage.
Nerve Injuries: Erb’s palsy ( $C5 - C6$ , "waiter’s tip" position) and Klumpke’s palsy ( $C8 - T1$ , limp hand/no grasp).
Haemorrhagic Disease of the Newborn ( $HDN$ ): Caused by Vitamin K deficiency. Prevention requires $1\,mg$ Vitamin K IM at birth.
Chromosomal Abnormalities: Includes Down’s syndrome (Trisomy 21), Edwards syndrome (Trisomy 18), and Patau’s syndrome (Trisomy 13).
GIT Malformations: Gastroschisis (exposed intestines), Exomphalos (bowel covered by thin membrane), and Imperforate anus.
CNS Malformations: Anencephaly (absence of forebrain), Spina bifida (meningocele or myelomeningocele), and Hydrocephalus (Arnold–Chiari malformation).