1
Q
✅ What dipstick result is considered proteinuria in children ⁉️
A
Dipstick ≥1+ (≥30 mg/dL) is considered proteinuria
Proteinuria indicates the presence of excess protein in urine, often a sign of kidney disease.
2
Q
📊 What does a trace dipstick reading correspond to in mg/dL ⁉️
A
10-20 mg/dL
A trace result indicates minimal protein presence, which may still warrant further investigation.
3
Q
What does a dipstick result of 1+ signify in terms of protein concentration ⁉️
A
30 mg/dL
This level indicates a low but significant presence of protein in the urine.
4
Q
What does a dipstick reading of 2+ indicate ⁉️
A
100 mg/dL
This level of proteinuria may suggest a more serious underlying condition.
5
Q
What does a dipstick reading of 4+ correspond to in mg/dL ⁉️
A
1000-1500 mg/dL
A 4+ reading indicates a **very high level of proteinuria*b , which may indicate severe kidney issues .
6
Q
🧪 What is the next step after a dipstick ≥1+ proteinuria ⁉️
A
Check first morning urine sample for UPr/UCr ratio
7
Q
⏰ Why must the first morning urine sample be used in proteinuria evaluation ⁉️
A
To avoid orthostatic proteinuria
##footnote
Which resolves with rest.
8
Q
⚖️ What is a normal urine protein/creatinine ratio (UPr/UCr) in children >2 years ⁉️
A
A ratio ≤0.2 is normal.
9
Q
🚩 What does a first morning UPr/UCr ratio >0.2 suggest ⁉️
A
Persistent proteinuria ➡️ Suggestive of renal disease .
10
Q
🔁 If initial UPr/UCr > 0.2, what is the next step ⁉️
A
Repeat first morning UPr/UCr in 2 weeks
11
Q
📉 What does UPr/UCr ≤0.2 on repeat indicate ⁉️
A
Likely transient proteinuria ➡️ Reassure and repeat annually.
12
Q
🧍♂️ What does a normal first morning sample but elevated daytime sample suggest ⁉️
A
Orthostatic proteinuria ➡️ Benign, no intervention needed.
13
Q
🛑 When should you refer a child for nephrology evaluation ⁉️
A
If persistent UPr/UCr >0.2 on repeat OR dipstick ≥3+ with symptoms.
14
Q
🚨 What are the criteria for nephrotic-range proteinuria ⁉️
A
Any of the following:
• 40 mg/m²/hr
• 1000 mg/m²/day
• 3–3.5 g/24hr
• UPr/UCr >2.5–3 in a random sample
15
Q
🧒 What is the most common cause of nephrotic syndrome in children aged 2–6 years ⁉️
A
Minimal Change Disease (MCD)
##footnote
Accounts for 80–90% of cases in this age group.
16
Q
🔬 What is the pathological mechanism in Minimal Change Disease (MCD) ⁉️
A
T-cell cytokine-mediated effacement of podocyte foot processes → causes albuminuria .
17
Q
📊 What are the classic laboratory features of nephrotic syndrome due to MCD ⁉️
A
✅ Proteinuria >3.5 g/day
✅ Hypoalbuminemia
✅ Hypercholesterolemia
✅ Hypercoagulability (↓ antithrombin III, protein C/S)
✅ No hematuria or hypertension (unless FSGS)
18
Q
💧 What are the hallmark clinical features of Minimal Change Disease in children ⁉️
A
🔻 Facial edema (AM) ➡️ leg edema (PM) ➡️ ascites & pleural effusion
🔻 Fatigue
🔻 Infection risk due to hypogammaglobulinemia
19
Q
🧪 What is seen on light microscopy, immunofluorescence, and electron microscopy in MCD ⁉️
A
🔻 LM : Normal
🔻 IF : Negative
🔻 EM : Effacement of podocyte foot processes ✅
20
Q
💊 What is the first-line treatment for the first episode of MCD ⁉️
A
Prednisone 60 mg/m²/day (divided BID × 6 weeks) ➡️ then 40 mg/m²/day alternate days × 6 weeks
21
Q
🔁 How is a relapse of MCD managed ⁉️
A
Prednisone 60 mg/m²/day until 3 consecutive days of negative urine protein , then taper over 4 weeks.
22
Q
🚨 What test must be done before starting corticosteroids in MCD ⁉️
A
PPD (Tuberculin skin test)
##footnote
To screen for latent TB.
23
Q
💉 When is cyclophosphamide indicated in Minimal Change Disease ⁉️
A
For steroid-resistant or frequent relapsing disease, or if steroid toxicity develops.
24
Q
🩺 What supportive measures are needed in MCD management ⁉️
A
🔹 Sodium restriction (while proteinuria persists)
🔹 Water restriction (if hyponatremic)
🔹 Diuretics (for severe edema)
🔹 Electrolyte monitoring
25
🦠 **What are complications of Minimal Change Disease** ⁉️
🔻 **Spontaneous bacterial peritonitis (SBP)**
🔻 **Pneumonia, sepsis**
🔻 **Thromboembolism**
##footnote
⚠️ **Prevent infections with pneumococcal vaccine**
26
📈 **What is the prognosis of MCD in children** ⁉️
✅ **80–90% respond to steroids within 2 weeks**
✅ Most children **outgrow the disease**
##footnote
⚠️ If not responsive or has hematuria/HTN → suspect **FSGS** (risk of ESRD)
27
🧒 **What is the most common cause of nephrotic syndrome in children aged 2–6 years** ⁉️
**Minimal Change Disease (MCD)**
28
👦 **In which age group is Focal Segmental Glomerulosclerosis (FSGS) more common** ⁉️
**Older children, adolescents, and adults**
29
🧪 **What are the key histological differences between MCD and FSGS on H&E stain** ⁉️
🔻 MCD: **Normal glomeruli**
🔻 FSGS: **Segmental sclerosis in some glomeruli (focal)**
30
🔬 **What are the electron microscopy (EM) findings in both MCD and FSGS** ⁉️
✔️ **Both show effacement of podocyte foot processes**
❌ **No immune complex deposits** (negative IF in both)
31
💊 **How does the response to steroids differ between MCD and FSGS** ⁉️
🔹 **MCD** : **Excellent response to steroids**
🔹 **FSGS** : **Poor response to steroids** , may require other immunosuppressants
32
⚠️ **Which secondary conditions are associated with FSGS but not MCD** ⁉️
➡️ **HIV infection**
➡️ **Heroin abuse**
➡️ **Sickle Cell Anemia (SCA)**
33
📈 **What is the long-term prognosis of MCD vs. FSGS** ⁉️
➡️ **MCD** : >80% resolve with treatment and may outgrow the disease
➡️ **FSGS** : Often progresses to **end-stage renal disease (ESRD)**
34
🧠 **What are the initial indications for renal biopsy at the time of diagnosis in a child with nephrotic syndrome** ⁉️
Any **2 or more** of the following:
• **Age <1 or >10–12 years**
• **Gross or persistent hematuria**
• **Hypertension**
• **Renal insufficiency**
• **Low serum C3 complement**
35
⏳ **When is renal biopsy indicated after diagnosis in a child with nephrotic syndrome** ⁉️ T
💡 **Steroid resistance** : Persistent proteinuria after **4 weeks of daily prednisone therapy**
36
🔍 **What is the most specific serologic marker for diagnosing lupus nephritis** ⁉️
**Anti-dsDNA antibodies**
37
🧪 **Which complement levels are typically decreased in lupus nephritis** ⁉️
**C3 and C4**
38
🧬 **Which autoantibody is most sensitive for systemic lupus erythematosus and commonly positive in LN** ⁉️
**ANA (antinuclear antibody)**
39
🔬 **What is required for definitive diagnosis and classification of lupus nephritis** ⁉️
**Renal biopsy**
40
💉 **Which class of lupus nephritis requires aggressive immunosuppressive therapy** ⁉️
**Class IV (Diffuse proliferative LN)**
41
💊 **What is the standard initial treatment for severe lupus nephritis (e.g., Class IV)** ⁉️
✔️ **Pulse IV methylprednisolone**
✔️ **Cyclophosphamide or Mycophenolate mofetil**
42
⚠️ **What are poor prognostic factors at presentation in lupus nephritis** ⁉️
🔹 **Anemia**
🔹 **Azotemia** (elevated BUN/Cr)
🔹 **Hypertension**
43
🧬 **What is the inheritance pattern and typical age of presentation in congenital nephrotic syndrome** ⁉️
🔹 **Autosomal recessive**
🔹 Presents **between birth and 3 months of age**
44
🧪 **What are key diagnostic and associated findings in congenital nephrotic syndrome** ⁉️
🔻 **Nephrotic-range proteinuria at birth**
🔻 **>80% are born premature**
🔻 **Enlarged placenta and kidneys**
🔻 Diagnosis confirmed via **genetic testing**
45
🔎 **What important differential diagnoses should be ruled out in congenital nephrotic syndrome** ⁉️
✅ **TORCH infections**
✅ **HIV**
##footnote
These can cause **secondary nephrotic syndrome** and must be excluded.
46
⚠️ **What are major clinical complications associated with congenital nephrotic syndrome** ⁉️
🔸 **Severe intractable edema**
🔸 **Frequent infections** (loss of IgG)
🔸 **Clotting risk** (loss of antithrombin III)
🔸 **Iron and vitamin D deficiency**
🔸 **Hypothyroidism**
47
💊 **What is the management approach for congenital nephrotic syndrome** ⁉️
🔻 **Daily IV albumin replacement**
🔻 **Nutritional supplementation (iron, vit D)**
🔻 **Curative option** : **bilateral nephrectomy** followed by **peritoneal dialysis and eventual transplant**
48
💧 **What is the definition of microscopic hematuria on urinalysis** ⁉️
**≥ 5 red blood cells (RBCs) per high-power field on urinalysis.**
49
🔬 **What finding on urinalysis strongly suggests glomerular hematuria** ⁉️
✔️ **RBC casts**
✔️ **Dysmorphic RBCs**
✔️ **Cola-colored urine**
✔️ **Proteinuria ≥ 2+**
✔️ **Absence of clots**
50
🧪 **What are key urinalysis features of non-glomerular hematuria** ⁉️
➡️ **No RBC casts**
➡️ **Eumorphic (normal-shaped) RBCs**
➡️ **Red or pink urine**
➡️ **Possible clots**
➡️ **Proteinuria < 2+**
51
⚠️ **List common causes of non-glomerular hematuria** ⁉️
✔️ **Urinary tract infection (UTI)**
✔️ **Trauma**
✔️ **Sickle cell anemia** (or trait)
✔️ **Kidney stones**
✔️ **Tumor**
✔️ **Polycystic kidney disease**
✔️ **Meatal stenosis**
✔️ **Renal vein thrombosis (RVT)**
52
🔴 **List glomerular causes of hematuria in children.**
🔸 **Post-infectious glomerulonephritis**
🔸 **IgA nephropathy**
🔸 **Lupus nephritis**
🔸 **Alport syndrome**
🔸 **Membranoproliferative glomerulonephritis** (MPGN)
🔸 **Henoch–Schönlein purpura** (HSP)
🔸 **Hemolytic uremic syndrome** (HUS)
53
🧠 **What nephritic syndrome features suggest glomerular hematuria** ⁉️
🔹 **Hematuria with RBC casts**
🔹 **Proteinuria** (<3.5 g/day)
🔹 **Oliguria**
🔹 **Azotemia**
🔹 **Hypertension**
🔹 **Periorbital edema**
🔹 **Dysmorphic RBCs**
54
💡 **What are some non-pathologic causes of red urine that are not true hematuria** ⁉️
♦️ **Myoglobinuria or hemoglobinuria**
♦️ **Medications** (e.g., rifampin)
♦️ **Food dyes** (e.g., beetroot)
♦️ **Urate crystals in newborns**
55
👧 **What is the typical age range for acute post-infectious glomerulonephritis (APIGN)** ⁉️
**5–15 years of age** (most common).
56
🧫 **What organism is responsible for APIGN, and what is the key virulence factor** ⁉️
**Group A beta-hemolytic Streptococcus** (GAS); the **M-protein** is the virulence factor.
57
⏱️ **What is the typical time frame between streptococcal infection and APIGN onset for pharyngitis vs impetigo** ⁉️
• **Pharyngitis** : **1–2 weeks after infection**
• **Impetigo** : **3–6 weeks after skin infection**
58
🧪 **What are the typical urinalysis findings in APIGN** ⁉️
➡️ **Dysmorphic RBCs**
➡️ **RBC casts**
➡️ **Proteinuria**
➡️ **Polymorphonuclear leukocytes**
59
🧬 **Which lab markers support a diagnosis of APIGN** ⁉️
🔸 Positive **ASO** or **anti-DNase B** (depending on throat vs skin source)
🔸 **Low C3** complement (should normalize in 6–8 weeks)
🔸 **Mild normochromic anemia**
60
🔬 **When is a renal biopsy indicated in APIGN** ⁉️
🔻 **Rapidly progressive glomerulonephritis** (RPGN)
🔻 **C3 level remains low after 8 weeks**
🔻 **Microscopic hematuria persists >2 years**
61
💊 **What is the treatment approach for APIGN** ⁉️
☑️ **Supportive care**
☑️ **Antibiotics** (to prevent spread, not to prevent APIGN)
☑️ **Salt and water restriction**
☑️ **Diuretics** for edema
☑️ **Calcium channel blockers** or **ACE inhibitors** for hypertension
62
🌟 **What is the prognosis of APIGN in children** ⁉️
**Excellent**
##footnote
95% recover completely.
63
🌍 **What is the most common chronic glomerular disease worldwide** ⁉️
**IgA Nephropathy (Berger’s disease)**
64
👤 **What is the typical demographic affected by IgA nephropathy** ⁉️
🔹 Peak incidence: **10–30 years old**
🔹 More common in **Asians and Caucasians**
65
🦠 **What typically triggers IgA nephropathy episodes** ⁉️
**Mucosal infections** (e.g., upper respiratory or GI infections), with hematuria occurring **within 1–2 days** of the infection
66
🧪 **What are the key clinical and lab findings in IgA nephropathy** ⁉️
🔻 **Recurrent gross hematuria or persistent microscopic hematuria**
🔻 **RBC casts**
🔻 **Proteinuria** (usually <1 g/day)
🔻 **Normal C3 and C4**
🔻 **Negative serologies** (ANA, anti-dsDNA)
🔻 Serum IgA may be elevated but **not diagnostic**
67
🔍 **What is the definitive test for IgA nephropathy** ⁉️
**Renal biopsy** showing **mesangial IgA immune complex deposition** on immunofluorescence
68
💊 **What are the treatment options for IgA nephropathy** ⁉️
☑️ **Supportive care**
☑️ **ACE inhibitors or ARBs** to reduce proteinuria
☑️ **Corticosteroids** if nephrotic-range proteinuria
☑️ **Fish oil** (omega-3) has some anti-inflammatory benefit
69
**What are the differences in timing of hematuria after infection in IgA nephropathy vs post-infectious glomerulonephritis** ⁉️
🔹 **IgA Nephropathy** : Hematuria occurs **within 1–2 days** of a **mucosal infection** (e.g., URTI)
🔹 **PIGN** : Hematuria appears **1–3 weeks** after a **streptococcal infection** (pharyngitis or impetigo)
70
**How do complement levels differ between IgA nephropathy and PIGN** ⁉️
• **IgA Nephropathy** : **Normal C3 and C4**
• **PIGN** : **Low C3** (returns to normal within **6–8 weeks** )
71
**What are the immunofluorescence and histological findings in IgA nephropathy vs PIGN** ⁉️
🔹 **IgA Nephropathy** : **Mesangial IgA** immune complex deposits (IF: IgA+)
🔹 **PIGN** : **Subepithelial “hump-like” deposits** (IF: **IgG and C3** )
72
**What are the clinical features distinguishing IgA nephropathy from PIGN** ⁉️
♦️ **IgA Nephropathy** :
🔸 Recurrent **gross hematuria** (especially during concurrent infection)
🔸 **Persistent microscopic hematuria**
🔸 Typically **normal BP** , mild proteinuria
🔸 Normal renal function (initially)
♦️ **PIGN** :
🔸 Acute nephritic syndrome: **cola-colored urine** , **edema** , **hypertension** , **oliguria**
🔸 May progress to **encephalopathy** or **heart failure**
🔸 Proteinuria and HTN resolve in **4–6 weeks**
🔸 Microscopic hematuria may persist up to **2 years**
73
**How does age of onset and diagnostic approach differ between IgA nephropathy and PIGN** ⁉️
🔹 **IgA Nephropathy** :
🔸 Age: **10–30 years**
🔸 Diagnosis: **Renal biopsy** (serum IgA may be ↑ but not diagnostic)
🔹 **PIGN** :
🔸 Age: **5–15 years**
🔸 Diagnosis: **ASO or anti-DNase** B titers, **low C3** , supportive urinalysis
• Renal biopsy **only if atypical** course (e.g., RPGN, C3 remains low >8 wks)
74
**What are the key differences in treatment and prognosis between IgA nephropathy and PIGN** ⁉️
♦️ **IgA Nephropathy** :
• **Supportive treatment** (ACE inhibitors, BP control)
• **Corticosteroids** if nephrotic-range proteinuria
• **Progression to ESRD in 15–20%**
♦️ **PIGN** :
• **Supportive treatment** (diuretics, salt restriction, BP meds)
• **Antibiotics** for streptococcus (10-day course)
• **Excellent prognosis** – 95% recover fully
75
🧬 **What is the most common inheritance pattern and genetic mutation in Alport Syndrome** ⁉️
🔻 🔁 **X-linked recessive (85%)** → called **XLAS**
🔻 🧬 Mutation in COL4A5 gene → affects type IV collagen
76
⚠️ **What is the classic clinical triad and additional findings in Alport Syndrome** ⁉️
♦️ 🚨 **Triad** :
• 🩸 **Hematuria** (microscopic or gross)
• 👂 **Sensorineural hearing loss**
• 👁️ **Ocular anomalies** (e.g., **anterior lenticonus** )
♦️ ➕ Other signs:
• ⬆️ **Proteinuria*b (progressive)
• 🔺 **Hypertension**
77
🔬 **What is the characteristic finding on electron microscopy in Alport Syndrome** ⁉️
• 🔍 **Thinning and splitting** of the **glomerular basement membrane (GBM)**
• 🧺 Classic **“basket-weave” appearance** .
78
🩺 **What is the prognosis and follow-up advice in Alport Syndrome** ⁉️
• ⏳ Progresses to **ESRD** (especially in XLAS males)
• 🩹 **No cure** , only **supportive treatment** (ACEi for proteinuria)
• 👩⚕️ Even **female carriers** require regular **monitoring** due to potential renal involvement
79
🧫 **What is the underlying pathophysiology and typical trigger of Henoch-Schönlein Purpura (HSP)**
🔻 💥 **IgA immune complex–mediated small vessel vasculitis**
🔻 🤧 Triggered by **upper respiratory tract infection** (1–2 weeks prior)
80
🩸 **What is the classic tetrad of clinical features in HSP** ⁉️
🔹 🔴 **Palpable purpura** (usually on lower extremities, buttocks)
🔹 🤕 **Abdominal pain** (due to bowel wall vasculitis)
🔹 🦵 **Arthritis or arthralgia** (knees and ankles)
🔹 🩸 **Hematuria** (glomerulonephritis in 30–50%)
🔹 🧪 May progress to **ESRD** in 2–5% of cases
81
🧪 **What are the lab findings in HSP, and how do they help differentiate it from other causes of purpura** ⁉️
✔️ 📈 **Normal or elevated platelet count** (unlike thrombocytopenic purpura)
✔️ 🚫 No coagulopathy
✔️ 🧬 Urinalysis may show **hematuria ± proteinuria**
82
🩺 **How is HSP managed and followed up, especially regarding renal involvement** ⁉️
🔹 🛌 **Supportive care is the mainstay**
🔹 💊 **Steroids** may relieve joint/abdominal pain but **do not alter renal outcome**
🔹 🩻 **Follow-up for at least 6 months** to monitor for **renal progression**
83
🧪 **What are the key clinical and diagnostic features of Familial Thin Basement Membrane Nephropathy (TBMN)** ⁉️
🔻 👨👩👧👦 **Autosomal dominant** inheritance
🔻 🔬 **Persistent microscopic hematuria**
🔻 🩸 May see **RBC casts** in urine
🔻 🧬 Often positive **family history** of hematuria without renal failure
🔻 🔍 **Renal biopsy** :
🔹 ✨ **Thin GBM on electron microscopy (EM)**
🔹 🧫 **Normal glomeruli on light microscopy**
84
📈 **What are the possible complications and prognosis of TBMN** l
• 💡 **Excellent prognosis** – no progression to renal failure in most cases
• ⚠️ **Proteinuria** may occur in up to 30% of adults
- Managed with **ACE inhibitors** if needed
• 👀 **No family history of renal failure** is a reassuring sign
• ✅ **Screening** : urinalysis and microscopy for first-degree relatives
85
🧪 What are the diagnostic criteria for hypercalciuria by age and test type?
• 🧒 **Spot urine Ca/Cr ratio** :
- **> 0.2** if age > 8 years
- **> 0.8** in **infants < 7 months**
• 🧾 **24-hour urine calcium** :
- **> 4 mg/kg/day**
86
🧬 **What are the causes of hypercalciuria (Idiopathic vs Secondary)** ⁉️
• ⚖️ **Idiopathic hypercalciuria** (normal serum Ca)
• 🔁 **Secondary to hypercalcemia** :
- 🧠 **Hyperparathyroidism**
- ☀️ **Vitamin D intoxication**
- 🛌 **Immobilization**
- 🌿 **Sarcoidosis**
- 🌟 **Cushing syndrome**
- 🎶 **William’s syndrome**
- 🧂 **Bartter syndrome**
87
⚠️ **What are the clinical features and complications of untreated hypercalciuria** ⁉️
• 🚫 *bAsymptomatic*b in many cases
• ⚠️ May cause:
- 🪨 **Nephrolithiasis** (kidney stones)
- ⚡ **Hematuria**
- 🤕 **Abdominal pain**
88
💊 **What is the management of hypercalciuria** ⁉️
• 🎯 **Treat underlying cause** (if secondary)
• 💊 **Hydrochlorothiazide – ↓ urinary calcium
• 🧂 **Sodium restriction** to enhance thiazide effect
89
**What is the hallmark lab finding in all types of Renal Tubular Acidosis (RTA)** ⁉️
➡️ **Normal anion gap (hyperchloremic) metabolic acidosis**
##footnote
🧪 HCO₃↓, Cl↑, AG <12
90
**What distinguishes the three types of RTA in terms of urine pH** ⁉️
➡️
• **Type I (Distal)** : Urine pH **> 6.0**
• **Type II (Proximal)** : Urine pH **< 5.5**
• **Type IV (Hypoaldosteronism)** : Urine pH **< 5.5**
91
**Which type of RTA is due to failure of H⁺ excretion in the distal nephron** ⁉️
➡️ **Type I (Distal RTA)**
##footnote
🚽 Urine can’t acidify → pH > 6
92
**What are the classic features of Type I (Distal) RTA** ⁉️
➡️
• **Urine pH > 6.0**
• **Hypokalemia** 🔻K
• **Nephrolithiasis** , nephrocalcinosis (due to ↑urine Ca) 🪨
• **Causes** : Autoimmune (Sjögren, SLE), congenital
93
**Which type of RTA is due to HCO₃⁻ wasting in the proximal tubule** ⁉️
➡️ **Type II (Proximal RTA)**
##footnote
🧪 ↓ HCO₃ reabsorption
94
**What are the classic features of Type II (Proximal) RTA** ⁉️
➡️
• **Urine pH < 5.5**
• **Hypokalemia** 🔻K
• **Fanconi syndrome** features:
→ **Phosphaturia** , **glycosuria** , **aminoaciduria** , **uricosuria**
• **Causes** : **Cystinosis, Lowe syndrome, Wilson disease, lead toxicity**
95
**Which RTA type is associated with aldosterone deficiency or resistance** ⁉️
➡️ **Type IV RTA** (hypoaldosteronism)
96
**What are the key features of Type IV RTA** ⁉️
➡️
• **Urine pH < 5.5**
• **Hyperkalemia** ⚠️🆘
• **Mild acidosis**
• **Causes** : **CAH, diabetic nephropathy, ACEi/ARB, NSAIDs, spironolactone**
97
**Which RTA type is most likely to cause kidney stones** ⁉️
➡️ *bType I (Distal RTA)**
##footnote
🪨 Due to hypercalciuria and alkaline urine
98
**Which RTA type is associated with bone disease and rickets** ⁉️
➡️ **Type II (Proximal RTA)**
##footnote
🦴 Due to phosphate wasting → hypophosphatemic rickets
99
**What test helps differentiate proximal vs distal RTA** ⁉️
➡️ **Urine pH**
• 6 → distal
• <5.5 → proximal
100
**How is RTA generally treated** ⁉️
➡️
• **Type I** : **Oral bicarbonate, thiazide** (for stones)
• **Type II** : **Large doses of bicarbonate, potassium**
• **Type IV** : **Treat hyperkalemia, fludrocortisone** (if low aldosterone)
101
**What is the genetic cause of Cystinosis** ⁉️
➡️ 🧬 **Autosomal recessive** mutation in the **CTNS gene** → defective **cystinosin** (lysosomal transporter)
102
**What is the underlying mechanism of Cystinosis** ⁉️
➡️ ❌ Defective export of **cystine** from lysosomes → accumulation → formation of **cystine crystals** → multi-organ damage
103
**What ocular symptom is typical in Cystinosis and why** ⁉️
➡️ 😎 **Photophobia** due to **cystine crystal deposits** in the **cornea**
104
**What renal condition does Cystinosis cause** ⁉️
➡️ 🚽 **Fanconi syndrome** :
• **Glycosuria**
• **Phosphaturia**
• **Bicarbonaturia**
• **Aminoaciduria**
• **Uricosuria**
➡️ → **Polyuria, polydipsia, FTT, rickets**
105
**What systemic features are associated with Cystinosis** ⁉️
➡️
• **Failure to thrive** 📉
• **Microscopic hematuria** 🔬
• **Craving salt** 🧂
• **Hypothyroidism** 🦋
• **Low-normal IQ** 🧠
• **Neurologic involvement in late stages**
106
**What is the definitive treatment for Cystinosis** ⁉️
➡️ 💊 **Oral Cysteamine**
##footnote
→ Depletes intracellular cystine → slows organ damage
107
**What is the prognosis if untreated** ⁉️
➡️ 📉 **Progressive renal failure, endocrine & neurologic damage**
108
**What is the pathophysiology of Nephrogenic Diabetes Insipidus (NDI)** ⁉️
➡️ 🧪 **Insensitivity of the distal nephron to ADH (vasopressin)** → kidneys can’t concentrate urine → water loss
109
**What is the most common genetic form of NDI** ⁉️
➡️ 🔬 **X-linked recessive** form (90%)
🧬 Mutation in **AVPR2 gene**
110
**What are secondary (acquired) causes of NDI** ⁉️
➡️
• 🩺 **Nephrotoxic drugs** (e.g., lithium, amphotericin B)
• 🔥 **Chronic pyelonephritis**
• 💔 **Obstructive uropathy**
• 🧬 **Sickle cell trait**
• 🧪 **Hypercalcemia, hypokalemia**
111
**What are the hallmark clinical features of NDI** ⁉️
➡️
• 🚱 **Polyuria** (large volume dilute urine)
• 😫 **Polydipsia** (extreme thirst)
• 🍼 **Failure to thrive** (FTT) in infancy
• 💩 **Constipation**
• 🧠 **Intellectual disability** , ADHD-like behavior
• 🚽 **Inability to toilet train**
• 🔔 **Daytime accidents** , enuresis
• 🧊 **Hypernatremia**
112
**What lab findings support a diagnosis of NDI** ⁉️
➡️
• 🧪 **Urine specific gravity < 1.015** (dilute urine)
• 💉 **High serum osmolarity (>300)**
• 💉 **High or normal plasma ADH**
• 🧪 **No increase in urine osmolality** after **vasopressin test**
113
**How is NDI treated** ⁉️
➡️
• 🚰 **Free access to water** always
• 🧂 **Low sodium & low protein diet**
• 💊 **Thiazide diuretics** (↓ polyuria via volume contraction)
• 💊 **Indomethacin** (↓ prostaglandins, which inhibit ADH)
114
**What are red flag signs for NDI in toddlers/children** ⁉️
➡️
• 🍼 **FTT**
• 🚽 **Inability to toilet train**
• 🔄 **Constant thirst**
• 📈 **Unexplained hypernatremia**
115
🧪 **What features are common to both Bartter and Gitelman syndromes** ⁉️
• **Hypokalemia** ⬇️
• **Metabolic alkalosis** 🧴
• **Normal or low blood pressure** (despite RAAS activation) 📉
• **Salt-wasting tubulopathies** 🧂🚽
116
🧬 **What is the underlying pathophysiology of Bartter syndrome** ⁉️
🔹 Mutation in **NKCC2** (Na⁺-K⁺-2Cl⁻ cotransporter) in thick ascending loop
🔹 Leads to **salt wasting, volume depletion, and RAAS activation**
🔹 Results in hypokalemia, metabolic alkalosis, and hypercalciuria
🔹 Elevated **prostaglandins** contribute to symptoms
117
🧪 **Which syndrome causes hypercalciuria and which causes hypocalciuria?** ⁉️
• **Bartter syndrome** causes **hypercalciuria** (⬆️ urinary calcium).
• **Gitelman syndrome** causes **hypocalciuria** (⬇️ urinary calcium).
118
🧬 **Which syndrome causes hypomagnesemia with magnesuria**
• **Gitelman syndrome** causes **hypomagnesemia** and **increased urinary magnesium** (magnesuria).
• **Bartter syndrome** usually has normal or slightly low magnesium.
119
👶 Which syndrome typically presents in infancy with polyhydramnios and failure to thrive?
• **Bartter syndrome** presents early in life, often **in infancy** , with **polyhydramnios, vomiting, FTT, and dehydration** .
##footnote
• **Gitelman syndrome** usually presents **later in childhood or adolescence** with fatigue, muscle cramps, and paresthesias.
120
🧪 Which ion transporter is affected in each syndrome?
• **Bartter syndrome** affects the **Na⁺-K⁺-2Cl⁻ cotransporter (NKCC2)** in the **thick ascending loop of Henle** .
• **Gitelman syndrome** affects the **Na⁺-Cl⁻ cotransporter (NCC)** in the **distal convoluted tubule** .
121
👶 **A 2-month-old with consanguineous parents presents with polyuria, polydipsia, FTT, normal BP, metabolic alkalosis, hypokalemia, and hypercalciuria. What is the most likely diagnosis** ⁉️
A. Gitelman syndrome
B. Diabetes insipidus
C. Liddle syndrome
D. Bartter syndrome
✅ **D. Bartter syndrome**
122
🩸 **What are the classic lab features of prerenal AKI** ⁉️
• BUN:Creatinine ratio **> 20**
• **Urine Na < 20 mEq/L**
• **FENa < 1%** (neonates < 2%)
• **Urine osmolality > 500 mOsm/kg**
• **Urine specific gravity > 1.020**
123
⚠️ **What are common causes of prerenal AKI** ⁉️
🔸 **Dehydration**
🔸 **Hemorrhage**
🔸 **Hypovolemia**
🔸 **Heart failure**
🔸 **Renal artery stenosis**
124
🔬 **What lab findings suggest intrinsic (renal) AKI** ⁉️
• BUN:Creatinine ratio **< 15**
• **Urine Na > 40 mEq/L**
• **FENa > 2%** (neonates > 2.5%)
• **Urine osmolality < 350 mOsm/kg**
• **Urine specific gravity ≤ 1.010**
• **Muddy brown casts** in ATN
125
🧪 **What are some common intrinsic causes of AKI and their clues** ⁉️
• **ATN (ischemia/toxins)** → Muddy brown granular casts
• **Post-infectious GN** → Hematuria 2–3 wks after pharyngitis/impetigo
• **IgA nephropathy** → Gross hematuria 1–3 days post-URI
• **Lupus nephritis** → Malar rash, arthritis, photosensitivity
• **Allergic interstitial nephritis** → Fever, eosinophilia, rash, WBC & eosinophils in urine
• **HUS** → Bloody diarrhea, anemia, thrombocytopenia, ↑LDH, schistocytes
• **RPGN** → Crescents on biopsy, rapid decline in function
126
🚧 **What findings suggest postrenal AKI** ⁉️
• **Bladder distension** or **bilateral hydronephrosis on renal ultrasound**
• May have **variable FENa**
• Can cause **initially high BUN:Cr > 20** , but then looks like intrinsic if damage ensues
##footnote
• **Caused by** :
• Posterior urethral valves
• Stones
• Tumors
• Neurogenic bladder
127
💡 **What is the best initial approach to suspected AKI** ⁉️
• **History & physical exam**
• **Assess urine output (<1 mL/kg/hr)**
• **Check** :
✔️ **BUN, creatinine**
✔️ **Electrolytes**
✔️ **Urinalysis**
✔️ **Urine Na, FENa*b
✔️ **Renal ultrasound*g
128
🆘 **What are the major indications for starting dialysis (renal replacement therapy) in AKI** ⁉️
• **Volume overload** > 10–20% of body weight
• **Severe acidosis**
• **Hyperkalemia** not responding to meds
• **Uremia** (BUN > 100 mg/dL)
• **Encephalopathy or pericarditis*g
129
🧒 **What is the most common cause of chronic kidney disease in children under age 5** ⁉️
👉 **Congenital renal and urinary tract malformations** (e.g. CAKUT — congenital anomalies of the kidney and urinary tract)
130
👧 **What is the most common cause of chronic kidney disease in children aged 5–14 years** ⁉️
👉 **Genetic diseases, nephrotic syndrome, and systemic diseases** (e.g. lupus)
131
🧑 **What is the most common cause of chronic kidney disease in adolescents (15–19 years)** ⁉️
👉 **Glomerular diseases** , such as **nephrotic syndrome** and **lupus nephritis**
132
📉 **How is chronic kidney disease classified by GFR** ⁉️
• **GFR > 90** : No symptoms
• **GFR 60–90** : Mild ↓ GFR
• **GFR 30–60** : Moderate ↓ GFR
• **GFR 15–30** : Severe ↓ GFR
• **GFR < 15** : **End-stage** → needs **dialysis or transplant**
133
💡 **What are the indications for starting dialysis in chronic kidney disease (CKD) in children** ⁉️
👉
• **Fluid overload** unresponsive to diuretics
• **Failure to thrive** or poor linear growth 📏
• *bUncontrolled electrolyte abnormalities** (e.g. hyperkalemia)
• **Uremic symptoms** (nausea, pericarditis, encephalopathy)
• **GFR ≤ 10–15 mL/min/1.73m²**
134
⚠️ **How do dialysis indications differ between AKI and CKD** ⁉️
👉 In **CKD** , dialysis may be started **electively** for growth failure or electrolyte issues
👉 In **AKI** , dialysis is often **urgent** for life-threatening complications (fluid overload, severe acidosis, uremia)
135
🔥 **How do pyelonephritis and cystitis differ in presentation** ⁉️
👉 **Pyelonephritis** = **Fever is present** 🌡️
👉 **Cystitis** = **No fever** , usually **localized urinary symptoms** 🚫🌡️
136
👶 **In infants <1 year, which sex is more likely to get a UTI and why** ⁉️
👉 **Males > Females (3:1)**
Especially **uncircumcised boys**
➡️ Due to **longer urethra and increased bacterial colonization**
137
👧 **After the first year of life, which sex is more prone to UTIs and why** ⁉️
👉 **Females > Males (10:1)**
##footnote
Due to **short urethra and proximity to anal opening**
138
🦠 **What is the most common pathogen causing UTI in children** ⁉️
👉 **Escherichia coli (E. coli)**
##footnote
**mostly ascending infection**
139
⚠️ **What are common patient-related and doctor-related risk factors for pediatric UTI** ⁉️
🧍 Patient:
• **Incomplete voiding or infrequent micturition**
• **Poor hygiene**
• **Vulvitis (girls), Uncircumcised boys**
👨⚕️ Doctor/System:
• **Obstructive uropathy**
• **Constipation**
• **Neuropathic bladder**
• **Overuse of antibiotics**
140
🧪 **What are key findings in pyelonephritis vs cystitis** ⁉️
👉 **Pyelonephritis** :
• **High fever, vomiting, abdominal/flank pain, hematuria, HTN**
👉 **Cystitis** :
• **Dysuria, urgency, frequency, suprapubic pain, secondary enuresis**
• **NO fever** in most cases
141
🧫 **What urine findings are diagnostic for UTI in children** ⁉️
👉 **>5 WBC/HPF (pyuria)** and **≥100,000 CFU of single organism**
👉 **WBC casts** → suggest upper tract (pyelonephritis)
👉 Beware:
• **UTI without pyuria** = due to prior antibiotics or TB
• **Pyuria without UTI** = due to fever, nephritis, dehydration
142
🔬 **What imaging studies are used in pediatric UTI workup** ⁉️
👉 **Ultrasound (U/S)** : Initial screening
👉 **DMSA scan** : To detect renal scarring or pyelonephritis
👉 **Voiding cystourethrogram (VCUG)** :
• Used for **vesicoureteral reflux (VUR) or posterior urethral valves (PUV)**
143
💊 **How do you treat cystitis vs pyelonephritis in children** ⁉️
👉 **Cystitis**:
• **Oral nitrofurantoin** or **amoxicillin** for **5 days**
👉 **Pyelonephritis** :
• **3rd-gen cephalosporins** (e.g., ceftriaxone, cefotaxime)
• **Oral or IV** for **7–14 days** depending on severity
144
🚽 **What is vesicoureteral reflux (VUR)** ⁉️
👉 **VUR** is the abnormal **backflow of urine** from the **bladder** into the **ureter and possibly kidneys** due to incompetence of the ureterovesical junction.
145
🧬 **What is the primary diagnostic method for grading VUR** ⁉️
👉 **Voiding cystourethrogram (VCUG)** is the gold standard to evaluate and grade VUR.
146
📊 **What happens in Grade I VUR, and how is it managed** ⁉️
👉 **Urine refluxes into ureter only**
🛑 **No dilation**
🩺 **Management** : No treatment needed — **periodic urine cultures only**
147
📊 **What happens in Grade II VUR, and what’s the approach** ⁉️
👉 *gUrine reaches ureter + renal pelvis + calyces** , still **no dilation*b
🩺 **Management** : Like Grade I → **No treatment needed, monitor with urine cultures**
148
📊 **What is seen in Grade III VUR, and how is it treated** ⁉️
👉 **Mild dilation** of ureter and renal pelvis, **mild calyceal blunting**
💊 **Management** :
• **Prophylactic antibiotics**
• **Repeat VCUG** after some time to check for resolution
149
📊 **What is the finding and management in Grade IV VUR** ⁉️
👉 **Moderate dilation** of ureter and pelvis, **moderately blunted calyces**
🔧 **Management** :
• Likely requires surgical intervention
150
📊 **What defines Grade V VUR, and what’s the treatment** ⁉️
👉 **Severe dilation of renal pelvis, tortuous ureter, severely blunted calyces**
🔧 **Management** :
• **Surgical correction is required**
151
🧒 **Which grades of VUR are more likely to resolve spontaneously** ⁉️
👉 **Grades I & II** → High rate of **spontaneous resolution**
👉 **Grade III** → May resolve with **prophylactic antibiotics**
👉 **Grades IV & V** → Often require **surgical repair**
152
🤔
إلى هُنا تنهي رحلتنا لهذا الشابتر 😵💫📍
Pediatrics
flashcards
Decks in class (15)
# Cards
