Czech Paediatrics Board Examination common mistakes
Czech Paediatrics Board Examination · Understand the traps and how to avoid them.
When a neonatal jaundice question gives a bilirubin value and an age in hours, the candidate applies a single phototherapy or exchange threshold from memory instead of plotting the value against the hour-specific nomogram curve and the gestational age/risk category.
Candidates memorise one 'magic number' (e.g. 300 µmol/L) from undergraduate teaching and never internalise that the treatment threshold is a moving curve that depends on postnatal age in hours, gestational age, birth weight, haemolysis and clinical status. Under time pressure the single number feels safe.
What to do instead
For every jaundice item, first write down three axes: age in hours, risk category (term vs preterm, well vs unwell, haemolysis present/absent), and whether the question asks about monitoring, phototherapy or exchange transfusion. Practise reading the Czech/Society of Neonatology hour-specific charts until you can state the threshold direction (threshold falls as risk rises, rises with postnatal age). Always check whether the stem gives direct Coombs, blood group incompatibility or a falling haemoglobin, because that moves the patient into a higher-risk curve.
On growth items the candidate reads a single height or weight value against a percentile chart and declares the child normal or abnormal, ignoring the mid-parental target height, the child's own growth trajectory, and bone age.
Percentile charts are visually seductive and candidates answer the number in front of them. Short stature and faltering growth are defined by trajectory and genetic potential, not by one cross-sectional point, and examiners deliberately build stems where the single value looks reassuring but the crossing of centile lines is the pathology.
What to do instead
Adopt a fixed routine for every growth question: (1) calculate mid-parental height and the target range (±8.5 cm for boys, ±8.5 cm for girls in the Czech convention), (2) compare current height SDS with the height SDS 1–2 years earlier to detect centile crossing, (3) check weight-for-height or BMI SDS to separate proportionate from disproportionate short stature, (4) only then consider bone age and dysmorphic features. If the stem gives serial measurements, the answer is almost always about the velocity, not the absolute value.
When a febrile infant or child is presented, the candidate commits to 'viral illness, discharge home' or to a full sepsis work-up without explicitly stratifying by age band (neonate, 1–3 months, older infant/child) and by the presence or absence of red-flag clinical signs.
Fever without source is taught in every rotation, so candidates rely on pattern recognition from their own clinical exposure rather than on the age-stratified algorithm the exam tests. The youngest age bands carry the highest risk of serious bacterial infection and have the lowest threshold for investigation, and this is exactly where the discriminator lies.
What to do instead
Before answering, state the age band out loud and the corresponding rule: any febrile neonate under 28 days is a full septic screen plus admission plus empirical antibiotics regardless of appearance; 1–3 months uses the validated risk stratification (well-appearing vs ill, inflammatory markers, urine testing); older children are driven by red flags (petechiae, lethargy, poor perfusion, meningism, respiratory distress). Also check vaccination status and whether urine culture was obtained, because UTI is the commonest occult bacterial source in this age group.
On paediatric ECG items the candidate interprets the tracing using adult normal values for axis, QRS duration, R/S progression and repolarisation, and therefore mislabels a normal infant ECG as pathological or misses a genuinely abnormal one.
Most ECG training is adult-oriented. Normal neonates have right axis deviation, dominant right ventricular forces, a deep and wide Q wave pattern in some leads, and physiological ST/T changes that resolve over the first year; candidates who do not recalibrate to age-specific norms answer confidently and wrongly.
What to do instead
Memorise the age-specific anchors: right axis in the newborn shifting to normal by 6 months–1 year, dominant R in V1 in the neonate with R/S transition moving leftward with age, and the normal QT corrected for heart rate. For any arrhythmia item, first calculate rate and QTc yourself and check whether the stem mentions syncope, family history of sudden death, or a maternal lupus history (congenital heart block). Practise with age-labelled tracings rather than adult ones.
On diarrhoea and dehydration items the candidate estimates the degree of dehydration from a single sign (e.g. sunken eyes or dry mucosa) and then prescribes a fluid plan without calculating the deficit, maintenance requirement and ongoing losses separately.
Dehydration assessment is taught as a gestalt and candidates carry that gestalt into a written exam where the expected answer is a structured calculation. The three-component fluid plan (deficit replacement, maintenance, ongoing losses) is the standard taught in Czech paediatric training, and skipping it produces answers that are directionally right but quantitatively wrong.
What to do instead
For every dehydration stem, write three lines before choosing an option: estimated deficit percentage (mild <5%, moderate 5–10%, severe >10% with shock), maintenance by the Holliday–Segar or per-kg rule for the child's weight, and ongoing losses. Then decide the route (oral rehydration solution for mild-moderate, IV bolus of crystalloid for shock) and the sodium content (isotonic fluid for most, hypertonic dehydration corrected slowly to avoid cerebral oedema). Check whether the question is about the first hour or the first 24 hours, because the answer changes.
In paediatric endocrinology the candidate treats a single random glucose or a single HbA1c as diagnostic, or manages diabetic ketoacidosis with a rapid insulin bolus and rapid fluid correction rather than the paediatric protocol.
Adult diabetes teaching dominates, and candidates transfer adult DKA management (aggressive fluids, bolus insulin, rapid osmolality correction) into paediatric stems. Paediatric DKA protocols deliberately avoid insulin boluses and correct slowly because of the risk of cerebral oedema, which is the leading cause of DKA death in children.
What to do instead
Fix the diagnostic criteria in memory: fasting glucose ≥7.0 mmol/L, random ≥11.1 mmol/L with symptoms, or 2-hour OGTT ≥11.1 mmol/L; HbA1c ≥48 mmol/mol (6.5%) supports but does not alone diagnose in a child without symptoms. For DKA, state the paediatric protocol: isotonic saline bolus 10–20 mL/kg for shock only, then maintenance plus deficit over 48 hours, insulin infusion 0.05–0.1 IU/kg/h started after the first fluid, no bolus, hourly neurological observations, and mannitol or hypertonic saline ready for suspected cerebral oedema. Also state that potassium is added once urine output is confirmed.
On haematuria and proteinuria items the candidate jumps to a diagnosis (glomerulonephritis, nephrotic syndrome) without first classifying the finding: transient vs persistent, isolated vs combined, orthostatic vs fixed, glomerular vs non-glomerular, and without checking complement, albumin and blood pressure.
Candidates recognise the named diseases and pattern-match the stem to the most familiar one. The exam, however, frequently tests the classification step itself - for example post-streptococcal glomerulonephritis (low C3, normal C4, raised ASO) versus IgA nephropathy (normal complement) versus minimal change nephrotic syndrome (selective proteinuria, normal complement, response to steroids).
What to do instead
Use a fixed sequence: confirm persistence (repeat urinalysis, exclude orthostatic proteinuria with a first-morning sample), classify as isolated or combined, then check complement C3/C4, albumin, creatinine, blood pressure and urine microscopy for red cell casts or dysmorphic red cells. For nephrotic syndrome, state the tetrad (heavy proteinuria, hypoalbuminaemia, oedema, hyperlipidaemia) and the steroid regimen with the definition of steroid resistance. For haematuria, always ask whether the child has hypertension, oedema, or a recent infection, because those three answers redirect the whole differential.
On developmental and neurological items the candidate assesses a milestone against a single age norm without distinguishing regression from delay, without checking whether the milestone is a limit age (red flag) or an average age, and without separating motor from language and social domains.
Milestone tables are memorised as single numbers, so candidates answer 'normal for age' or 'delayed' from one data point. Examiners build stems around the distinction between a limit age (the age by which a milestone must be achieved) and an average age, and around the critical difference between a static delay and developmental regression, which changes the entire investigation pathway.
What to do instead
Learn milestones as limit ages rather than averages (e.g. sitting unsupported by 9 months, walking by 18 months, single words by 18 months, two-word phrases by 2 years, and the red flags for hearing and vision). For every stem, ask three questions: is there regression (loss of previously acquired skills - this mandates urgent neurological and metabolic investigation), is the delay isolated or global, and are there dysmorphic features or a family history. If regression is present, the answer is never 'reassure and review'.
On haematology and oncology items the candidate interprets a full blood count in isolation, treating pancytopenia or a low platelet count as a single diagnosis (usually leukaemia or ITP) without checking the blood film, reticulocyte count, haemolysis markers, and whether the presentation fits the epidemiology of that age group.
Leukaemia and ITP are the two diagnoses candidates remember, so every cytopenia is forced into one of them. In reality the exam tests the reasoning step: is this a production problem or a destruction problem, is there a consumptive microangiopathy, is there marrow infiltration, and what does the film show (blasts, schistocytes, spherocytes, atypical lymphocytes).
What to do instead
For any cytopenia, write four columns: production (reticulocytes, marrow), destruction (bilirubin, LDH, haptoglobin, film), sequestration (spleen size), and loss (bleeding). For thrombocytopenia, check whether it is isolated (ITP is a diagnosis of exclusion in a well child with no hepatosplenomegaly and no blasts) or part of pancytopenia (which mandates film and bone marrow assessment). For anaemia, classify by mean corpuscular volume and reticulocyte count before naming a disease. State explicitly that a child with blasts on film needs urgent referral, not a repeat count in a month.
On emergency and intensive care items the candidate manages the airway, breathing and circulation in the order of the underlying diagnosis (e.g. treating the seizure or the wheeze first) rather than in the ABCDE sequence, and forgets the weight-based drug and fluid calculations and the paediatric-specific equipment sizing.
Clinical experience is diagnosis-driven, so candidates jump to the disease-specific treatment they recognise. Structured resuscitation frameworks reward candidates who demonstrate the sequence, and the exam tests whether the candidate can state the first three actions in order, the doses, and the reversible causes.
What to do instead
For every resuscitation stem, answer in ABCDE order with explicit actions and doses: airway adjunct size and position, oxygen and bag-mask technique, IV/IO access, fluid bolus 10–20 mL/kg, and the weight-based adrenaline dose (0.01 mg/kg IV/IO of 1:10,000). For seizures, state the benzodiazepine dose and route and the time to second-line therapy. For anaphylaxis, state intramuscular adrenaline 0.01 mg/kg (max 0.5 mg) into the anterolateral thigh as the first action, before antihistamines or steroids. For trauma and sepsis, name the reversible causes you are excluding.
On social paediatrics, ethics and legislation items the candidate answers from personal moral intuition or from general medical ethics principles rather than from the specific Czech legal framework - informed consent by age and capacity, mandatory reporting of suspected child abuse, the role of the OSPOD social-legal protection authority, and confidentiality limits.
These topics receive little clinical exposure and candidates assume 'ethics is common sense'. Czech law assigns specific ages and duties (e.g. the role of the child's legal guardian in consent, the statutory duty to report suspected abuse or neglect, and the position of the court in non-consensual care), and the exam tests those specifics rather than general principle.
What to do instead
Build a one-page legal reference sheet and revise it as a discrete topic: who consents for a minor and at what point the child's own view becomes decisive, the duty to report suspected abuse or neglect to OSPOD and the police, the rules on confidentiality and disclosure to third parties, and the process for involuntary examination or treatment. For every ethics stem, identify the specific legal duty or statutory body before discussing the ethical principle, because the exam usually wants the legally correct action, not the ethically elegant one.