LEARN Paediatrics EASY

Sturge–Weber Syndrome (SWS) :

is a neurocutaneous disorder (phakomatosis) characterized by vascular malformations involving the skin, brain, and eye.

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🧠 Core Pathology

* Caused by a somatic activating mutation in the GNAQ gene
* Leads to capillary–venous malformations
* Not inherited (sporadic)

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📍 Classical Triad

1. Facial capillary malformation (Port-wine stain)
* Typically along trigeminal nerve (V1 distribution)
* Present at birth
2. Leptomeningeal angioma
* Usually unilateral, occipital/parietal
* Causes:
* Seizures (often early infancy)
* Stroke-like episodes
* Hemiparesis
* Developmental delay
3. Ocular involvement
* Glaucoma (common)
* Choroidal angioma

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🧬 Clinical Features

* Seizures → most common presentation (often refractory)
* Developmental delay / intellectual disability
* Contralateral hemiplegia
* Visual field defects (homonymous hemianopia)
* Headache / migraine-like episodes

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🧪 Diagnosis

Imaging

* CT brain
* Classic “tram-track” calcifications
* MRI brain (best)
* Leptomeningeal enhancement
* Cortical atrophy

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👁️ Eye Evaluation

* Regular screening for glaucoma
* Intraocular pressure monitoring

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🧾 Classification (Roach Scale)

* Type I: Facial + leptomeningeal angioma (± glaucoma) → classic
* Type II: Facial only (± glaucoma)
* Type III: Leptomeningeal only (no facial nevus)

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💊 Management

1. Seizure control

* Antiepileptics:
* Levetiracetam
* Valproate
* Refractory cases → epilepsy surgery (hemispherectomy)

2. Glaucoma

* Medical therapy or surgery

3. Skin lesion

* Laser therapy (cosmetic):
* Pulsed dye laser

4. Stroke prevention (selected cases)

* Low-dose aspirin (controversial but used)

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⚠️ Prognostic Factors

* Early onset seizures (

🫁 ATYPICAL PNEUMONIA :

A form of pneumonia with non-classical presentation—milder symptoms, dry cough, and interstitial (not lobar) involvement on imaging.

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🦠 Common Causes

* Mycoplasma pneumoniae (most common in children)
* Chlamydia pneumoniae
* Legionella pneumophila
* Influenza virus
* Coxiella burnetii

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⚙️ Pathophysiology

* Predominantly interstitial inflammation
* Less alveolar exudate → explains milder chest findings
* Some organisms (like Mycoplasma) lack a cell wall

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👶 Clinical Features

“Walking pneumonia” pattern

* Gradual onset (days)
* Dry cough (key feature)
* Low-grade fever
* Headache, malaise, sore throat

Chest exam

* Often mild findings despite significant symptoms

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🩻 Investigations

* Chest X-ray: patchy, bilateral interstitial infiltrates
* CBC: normal or mild leukocytosis
* PCR / serology depending on organism
* Special clues:
* Cold agglutinins → suggest Mycoplasma
* Hyponatremia → suggests Legionella

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💊 Treatment

⚠️ β-lactams ineffective for many atypicals (especially Mycoplasma)

First-line:

* Azithromycin
* Clarithromycin

Alternatives:

* Doxycycline
* Levofloxacin

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⚠️ Complications

* Prolonged cough
* Extrapulmonary involvement (especially Mycoplasma)
* Severe disease (e.g., Legionella)

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🔍 Atypical vs Typical Pneumonia (Exam Core)

Feature Atypical Typical
Onset Gradual Sudden
Cough Dry Productive
Fever Low-grade High
Exam Mild Marked findings
X-ray Interstitial Lobar consolidation
Organisms Mycoplasma, Chlamydia Streptococcus pneumoniae
Treatment Macrolides β-lactams

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🧠 Key Memory Hook

“Bad X-ray, good chest exam → think atypical pneumonia”

Hepatic Encephalopathy :

Hepatic encephalopathy is a reversible neuropsychiatric syndrome caused by liver dysfunction → accumulation of neurotoxins (mainly ammonia) affecting brain function.

Pathophysiology (Core concept)

* Liver failure → ↓ detoxification of ammonia
* Ammonia crosses blood–brain barrier
* Astrocyte swelling → cerebral edema → raised ICP

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⚠️ Causes

1. Acute

* Acute liver failure (viral, drugs like Paracetamol)

2. Chronic

* Cirrhosis (portal-systemic shunting)

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🔥 Precipitating Factors (very important for exams)

* GI bleeding
* Infection / sepsis
* Constipation
* High protein intake
* Electrolyte imbalance (↓K⁺, ↓Na⁺)
* Sedatives (benzodiazepines)

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🧩 Clinical Features

Early:

* Irritability
* Poor concentration
* Sleep disturbance

Progressive:

* Confusion
* Disorientation
* Slurred speech

Severe:

* Coma
* Seizures (rare)

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📊 Grading (West Haven Classification)

Grade Features
I Mild confusion, irritability
II Drowsy, disoriented
III Stupor, responds to pain
IV Coma

👉 In children, subtle signs → diagnosis can be missed

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🧪 Investigations

* Serum ammonia ↑ (supportive, not always correlating)
* LFTs
* PT/INR ↑
* Electrolytes (Na⁺, K⁺)
* Blood glucose

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🚨 Management (Stepwise)

1️⃣ Stabilization

* Airway protection (intubate if Grade III/IV)
* ICU care

2️⃣ Reduce ammonia

* Lactulose
* Traps ammonia in gut (NH₃ → NH₄⁺)
* Rifaximin (↓ gut bacteria producing ammonia)

3️⃣ Treat precipitating cause

* GI bleed → control
* Infection → antibiotics
* Correct electrolytes

4️⃣ Nutrition

* Avoid excessive protein restriction
* Give adequate calories

5️⃣ Cerebral edema management (severe cases)

* Head elevation
* Mannitol / hypertonic saline
* Avoid fluid overload

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💀 Complications

* Cerebral edema (MC cause of death in acute cases)
* Aspiration pneumonia
* Sepsis

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🎯 Exam Pearls

* Ammonia is important but not diagnostic alone
* Always look for precipitating factors
* Lactulose is first-line therapy
* In acute liver failure → rapid progression to coma

Acute Liver Failure (ALF) :

Acute Liver Failure (ALF) in children is a rapidly progressive clinical syndrome characterized by severe hepatic dysfunction without pre-existing liver disease, leading to coagulopathy ± encephalopathy.

Definition (Pediatric):

* No known chronic liver disease
* Coagulopathy:
* INR ≥ 1.5 with encephalopathy OR
* INR ≥ 2.0 without encephalopathy
* Illness duration: typically < 8 weeks

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⚠️ Common Causes (Etiology)

1. Infectious

* Viral: Hepatitis A, Hepatitis B, Hepatitis E
* Others: CMV, EBV, HSV (especially neonates)

2. Drugs & Toxins

* Paracetamol (most common in many regions)
* Anti-TB drugs, antiepileptics
* Herbal medications

3. Metabolic (important in infants)

* Galactosemia
* Tyrosinemia type 1
* Wilson disease
* Mitochondrial disorders

4. Autoimmune

* Autoimmune hepatitis

5. Others

* Ischemia (shock liver)
* Hemophagocytic lymphohistiocytosis (HLH)
* Indeterminate (common in pediatrics)

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🧠 Clinical Features

Early:

* Nausea, vomiting
* Jaundice
* Lethargy

Progressive:

* Hepatic encephalopathy
* Irritability → confusion → coma
* Bleeding (due to coagulopathy)
* Hypoglycemia
* Ascites

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🧪 Investigations

Basic labs:

* LFTs: ↑ AST/ALT
* Bilirubin ↑
* PT/INR ↑ (key marker)
* Blood glucose ↓

Etiology workup:

* Viral serology
* Metabolic screen (ammonia, lactate, amino acids)
* Autoimmune markers

Other:

* Serum ammonia (↑ → encephalopathy risk)
* ABG (metabolic acidosis)

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🚨 Emergency Management (ICU)

1. Stabilization

* Airway, breathing, circulation
* ICU admission

2. Correct Hypoglycemia

* IV dextrose infusion (e.g., 10% dextrose)

3. Manage Coagulopathy

* Vitamin K
* FFP only if bleeding or procedure needed

4. Control Encephalopathy

* Head elevation (30°)
* Avoid overhydration
* Lactulose (controversial in ALF but sometimes used)
* Manage ammonia

5. Specific Therapy

* N-acetylcysteine (even in non-paracetamol ALF may help)
* Antivirals if indicated (e.g., HSV → acyclovir)

6. Fluids

* Careful balance (avoid cerebral edema)

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⚡ Indications for Liver Transplant

* Worsening INR (>4–6)
* Severe encephalopathy (Grade III/IV)
* Rising bilirubin
* Persistent hypoglycemia
* Metabolic acidosis

👉 Use King’s College criteria (commonly applied)

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🧠 Complications

* Cerebral edema (major cause of death)
* Sepsis
* Renal failure
* Bleeding

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📊 Prognosis

* Depends on cause:
* Good: Hepatitis A, paracetamol (if treated early)
* Poor: metabolic, indeterminate

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🔍 High-Yield Clinical Points

* In children, encephalopathy may be subtle or absent early
* Always check blood glucose and ammonia
* Early referral to transplant center is critical

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🎯 Exam Pearls

* INR is best prognostic marker
* Encephalopathy may be absent early in children
* Always check glucose + ammonia
* Early transplant referral saves life

INSULIN GROWTH FACTOR 1 AND ITS TYPES :

Insulin-like Growth Factor 1 (IGF-1) is a peptide hormone structurally similar to insulin and central to growth, development, and anabolic metabolism. It is the principal mediator of growth hormone (GH) effects.

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🔬 What is IGF-1?

* Produced mainly by the liver in response to GH stimulation
* Also synthesized locally in tissues (paracrine/autocrine action)
* Circulates bound to IGF-binding proteins (especially IGFBP-3)
* Has a longer half-life than GH → more stable marker of GH activity

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⚙️ Mechanism of Action

* Binds to IGF-1 receptor (tyrosine kinase receptor)
* Activates pathways:
* PI3K–AKT → cell survival, metabolism
* MAPK → cell proliferation and differentiation

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🧠 Physiological Functions

* Linear bone growth (epiphyseal plates)
* Skeletal muscle growth
* Protein synthesis ↑
* Glucose uptake ↑ (insulin-like effect)
* Organ growth and development

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🧬 “Types” of IGF

Strictly speaking, IGF has two main types, not subtypes:

1. IGF-1

* Primary mediator of GH
* Postnatal growth (childhood → puberty)
* Clinically most relevant

2. IGF-2

* Important in fetal growth and development
* Less dependent on GH
* Plays a role in embryogenesis and some tumors

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🧩 IGF-1 Isoforms (important nuance)

IGF-1 has splice variants (isoforms) rather than “types”:

* IGF-1Ea
* IGF-1Eb
* IGF-1Ec (also called Mechano-Growth Factor, MGF)
* Expressed in muscle after injury/exercise
* Important in tissue repair

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🧪 Regulation

* Stimulated by:
* Growth hormone
* Nutrition (protein intake)
* Decreased in:
* Malnutrition
* Chronic illness
* Liver disease

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🩺 Clinical Relevance

🔻 Low IGF-1

* Growth hormone deficiency
* Chronic malnutrition
* Chronic kidney/liver disease
* Hypopituitarism

🔺 High IGF-1

* Acromegaly (adults)
* Gigantism (children)

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🧾 Key Clinical Uses

* Screening test for GH disorders
* Monitoring treatment in GH deficiency or acromegaly
* More reliable than random GH measurement

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⚖️ Quick Comparison

Feature IGF-1 IGF-2
Main role Postnatal growth Fetal growth
GH dependent Yes Minimal
Clinical use High Limited
Source Liver + tissues Placenta, fetal tissues

CLD :

Chronic Lung Disease (CLD) is a broad clinical term for persistent respiratory disorders characterized by long-term airway or parenchymal damage, impaired gas exchange, and varying degrees of respiratory insufficiency. In pediatrics, it most often refers to Bronchopulmonary Dysplasia (BPD).

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1. Definition

* Chronic respiratory disease lasting >4–12 weeks (context-dependent)
* In neonates: oxygen dependency beyond 28 days of life or at 36 weeks corrected gestational age

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2. Types / Classification

A. In Neonates & Infants

* Bronchopulmonary Dysplasia (BPD)
→ Most common form
→ Seen in premature infants with respiratory distress

B. In Older Children & Adults

* Chronic Obstructive Pulmonary Disease (COPD)
* Asthma
* Interstitial Lung Disease
* Cystic Fibrosis

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3. Pathophysiology (focus: BPD)

* Arrested lung development (fewer, larger alveoli)
* Inflammation + fibrosis
* Pulmonary vascular remodeling → risk of pulmonary hypertension
* Ventilation-perfusion mismatch

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4. Risk Factors (Neonatal CLD / BPD)

* Prematurity (