A 6-year-old girl with asthma presents to the emergency department with acute breathlessness. She is sitting upright, unable to complete sentences, has respiratory rate 42/min, heart rate 145 bpm, oxygen saturation 91% in air, and widespread expiratory wheeze. She has received back-to-back salbutamol, nebulised ipratropium bromide, oral prednisolone 30 mg, and oxygen to maintain saturations >94%. After 45 minutes of treatment, her clinical state is unchanged. Which of the following treatment options has the strongest evidence base for improving outcomes at this stage?
Q92
A 3-year-old boy is brought to the GP with a 24-hour history of fever to 38.6°C and crying when passing urine. His mother reports he has been drinking well and has no vomiting or diarrhoea. On examination, he is alert and playful, temperature 38.4°C, heart rate 110 bpm, capillary refill time <2 seconds. Abdominal examination is normal. A clean-catch urine sample shows: leucocytes ++, nitrites positive, protein trace, blood negative. What is the most appropriate immediate management?
Q93
A 5-year-old boy with known asthma on beclometasone 200 micrograms twice daily presents with an acute asthma exacerbation. He has received nebulised salbutamol with ipratropium, oral prednisolone, and oxygen therapy. Despite this, he remains lethargic with oxygen saturation 90% on 15 litres high-flow oxygen, is speaking only single words, has a respiratory rate of 48/min, and has silent chest in some areas on auscultation. What is the most appropriate next step in management?
Q94
A 17-month-old child presents with a 72-hour history of fever up to 40.2°C. The parents report the child has had no other symptoms except mild irritability and reduced appetite. Examination reveals an alert child with temperature 39.7°C, heart rate 155 bpm, respiratory rate 35/min, capillary refill time <2 seconds. There is no rash, no focus of infection identified, and the child appears well hydrated. Urine dipstick is negative. What is the most appropriate next management step according to NICE traffic light system?
Q95
What is the recommended time interval for administering back-to-back salbutamol inhalers via spacer device in a child presenting with acute asthma to the emergency department?
Q96
A 7-month-old infant is brought to the emergency department with a 4-hour history of fever of 39.5°C and increased irritability. The infant was born at term with no complications and immunisations are up to date. On examination, the infant is crying inconsolably, has a bulging anterior fontanelle, and appears generally unwell. Temperature is 39.6°C, heart rate 170 bpm, respiratory rate 50/min, capillary refill time 2 seconds. What is the single most important immediate investigation?
Q97
A 4-year-old girl with known asthma presents to the emergency department with wheeze and increased work of breathing. She is able to talk in short sentences. Observations show: respiratory rate 38/min, heart rate 135 bpm, oxygen saturation 93% in air. She has widespread expiratory wheeze and moderate intercostal recession. After three doses of salbutamol via spacer and oral prednisolone, her oxygen saturation remains 93% and she still has moderate work of breathing. What is the most appropriate next step in management?
Q98
A 13-month-old infant presents with a 2-day history of coryzal symptoms and low-grade fever. Today the parents noticed inspiratory stridor that worsens when the child cries. The child is alert, playing, and able to drink normally. Temperature is 37.8°C, respiratory rate 32/min, heart rate 115 bpm, oxygen saturation 98% in air. There is mild subcostal recession and occasional inspiratory stridor at rest. What is the most appropriate immediate management?
Q99
A 2-year-old boy presents to the emergency department with a 6-hour history of fever of 39.8°C. His mother reports he has been irritable and refusing to eat. On examination, he has a capillary refill time of 4 seconds, heart rate 165 bpm, respiratory rate 45/min, and blood pressure 85/50 mmHg. His peripheries are cool and mottled. What is the most appropriate initial fluid bolus management?
Q100
A 5-year-old boy is brought to the emergency department during an acute asthma attack. He has been given nebulised salbutamol and ipratropium bromide with oxygen, and oral prednisolone. After 30 minutes, he remains in severe respiratory distress. He is speaking single words only, respiratory rate 46 breaths/minute, heart rate 148 bpm, oxygen saturation 91% on 15 litres oxygen via non-rebreathe mask. A blood gas is performed showing: pH 7.31, pCO2 6.8 kPa, pO2 8.9 kPa, base excess -1, bicarbonate 24 mmol/L. What is the most critical implication of this blood gas result?
Acute Paediatrics UK Medical PG Practice Questions and MCQs
Question 91: A 6-year-old girl with asthma presents to the emergency department with acute breathlessness. She is sitting upright, unable to complete sentences, has respiratory rate 42/min, heart rate 145 bpm, oxygen saturation 91% in air, and widespread expiratory wheeze. She has received back-to-back salbutamol, nebulised ipratropium bromide, oral prednisolone 30 mg, and oxygen to maintain saturations >94%. After 45 minutes of treatment, her clinical state is unchanged. Which of the following treatment options has the strongest evidence base for improving outcomes at this stage?
A. Intravenous magnesium sulphate 40 mg/kg over 20 minutes (Correct Answer)
B. Intravenous aminophylline loading dose 5 mg/kg over 20 minutes
C. Intravenous salbutamol infusion starting at 1 microgram/kg/min
D. Subcutaneous terbutaline 10 micrograms/kg
E. High-dose inhaled corticosteroid via nebuliser
Explanation: ***Intravenous magnesium sulphate 40 mg/kg over 20 minutes*** - This child presents with **acute severe asthma** unresponsive to initial bronchodilator and steroid therapy; **intravenous magnesium sulphate** is indicated as the next step with strong evidence for reducing hospital admissions. - It acts as a **smooth muscle relaxant**, facilitating bronchodilation by inhibiting calcium influx, and is recommended by national guidelines (e.g., **BTS/SIGN**) for children failing to respond to initial inhaled therapy. *Intravenous aminophylline loading dose 5 mg/kg over 20 minutes* - While considered for **life-threatening asthma**, aminophylline has a **narrow therapeutic index** and is associated with significant side effects such as arrhythmias, seizures, and vomiting. - Evidence for its benefit over magnesium in this specific scenario is less robust, and its use requires careful **cardiac monitoring**. *Intravenous salbutamol infusion starting at 1 microgram/kg/min* - **Intravenous salbutamol** is typically reserved for patients who do not respond to intravenous magnesium or those in **peri-arrest** situations with refractory bronchospasm. - There is currently **limited evidence** to support its use as a primary add-on therapy over IV magnesium in the pediatric emergency setting. *Subcutaneous terbutaline 10 micrograms/kg* - The **subcutaneous route** is less commonly used in modern practice for acute severe asthma, as **intravenous access** is generally preferred for more consistent and reliable drug delivery. - It does not possess the strong evidence base of **intravenous magnesium sulphate** for improving outcomes in severe acute asthma at this stage. *High-dose inhaled corticosteroid via nebuliser* - The patient has already received **systemic corticosteroids** (oral prednisolone), which are the cornerstone anti-inflammatory treatment in acute severe asthma. - Adding further **inhaled corticosteroids** in the acute phase does not provide significant additional clinical benefit beyond the already administered systemic dose for reversing acute bronchospasm.
Question 92: A 3-year-old boy is brought to the GP with a 24-hour history of fever to 38.6°C and crying when passing urine. His mother reports he has been drinking well and has no vomiting or diarrhoea. On examination, he is alert and playful, temperature 38.4°C, heart rate 110 bpm, capillary refill time <2 seconds. Abdominal examination is normal. A clean-catch urine sample shows: leucocytes ++, nitrites positive, protein trace, blood negative. What is the most appropriate immediate management?
A. Send urine for microscopy and culture and start oral trimethoprim while awaiting results (Correct Answer)
B. Refer to hospital for intravenous antibiotics
C. Send urine for microscopy and culture and review when results available
D. Start oral amoxicillin and arrange follow-up in 48 hours
E. Arrange urgent renal ultrasound within 6 weeks
Explanation: ***Send urine for microscopy and culture and start oral trimethoprim while awaiting results***- This child presents with a likely **urinary tract infection (UTI)** based on positive **leucocytes and nitrites** on dipstick and clinical symptoms of **dysuria** and fever.- According to **NICE guidelines**, children with a high risk of UTI (positive dipstick) should have a urine culture sent and be started on **empirical antibiotics** like trimethoprim or nitrofurantoin immediately.*Refer to hospital for intravenous antibiotics*- Hospitalization and **IV antibiotics** are reserved for infants <3 months old or children with **signs of sepsis**, dehydration, or severe **pyelonephritis**.- This child is **clinically stable**, alert, playful, and drinking well, making outpatient oral treatment appropriate.*Send urine for microscopy and culture and review when results available*- Delaying treatment until culture results are available is inappropriate when a dipstick is **nitrite-positive**, as this indicates a high probability of bacterial infection.- Prompt treatment is necessary to resolve symptoms and reduce the risk of the infection ascending to the **renal parenchyma**.*Start oral amoxicillin and arrange follow-up in 48 hours*- **Amoxicillin** is generally not recommended as a first-line empirical choice for UTI due to high rates of **E. coli resistance**.- Guidelines favor **trimethoprim**, **nitrofurantoin**, or a cephalosporin while awaiting specific **sensitivity results** from the lab.*Arrange urgent renal ultrasound within 6 weeks*- An **ultrasound** is not an immediate management step for the acute infection and is used later to screen for **structural abnormalities**.- Routine imaging is typically reserved for children under 6 months, those with **atypical UTI**, or cases of **recurrent UTI**.
Question 93: A 5-year-old boy with known asthma on beclometasone 200 micrograms twice daily presents with an acute asthma exacerbation. He has received nebulised salbutamol with ipratropium, oral prednisolone, and oxygen therapy. Despite this, he remains lethargic with oxygen saturation 90% on 15 litres high-flow oxygen, is speaking only single words, has a respiratory rate of 48/min, and has silent chest in some areas on auscultation. What is the most appropriate next step in management?
A. Continue current management and repeat nebulisers in 20 minutes
B. Administer intravenous salbutamol infusion
C. Administer intravenous magnesium sulphate 40 mg/kg over 20 minutes
D. Request immediate senior anaesthetic review for consideration of intubation (Correct Answer)
E. Commence intravenous aminophylline loading dose followed by infusion
Explanation: ***Request immediate senior anaesthetic review for consideration of intubation***
- The patient exhibits features of **life-threatening asthma**, including **lethargy**, speaking only **single words**, **silent chest**, and persistent **hypoxia** (SpO2 90% on high-flow oxygen) despite maximal medical therapy. These are critical signs of impending **respiratory failure**.
- At this stage, immediate **airway management** and **mechanical ventilation** are paramount. A **senior anaesthetic review** is crucial to prepare for and perform **intubation** and transition to **intensive care** before cardiorespiratory arrest occurs.
*Continue current management and repeat nebulisers in 20 minutes*
- Continuing the current management is inappropriate as the child has already demonstrated **failure to respond** to intensive bronchodilator therapy, corticosteroids, and oxygen.
- The presence of **lethargy** and a **silent chest** signifies a rapidly deteriorating condition and a life-threatening emergency that demands immediate escalation, not repetition of failed treatment.
*Administer intravenous salbutamol infusion*
- While **intravenous salbutamol** is an escalation for severe asthma, the patient's clinical picture of **lethargy** and **silent chest** indicates imminent **respiratory collapse**, for which airway management takes precedence.
- Pursuing only further pharmacotherapy without addressing the critical signs of respiratory exhaustion and impending failure can dangerously delay definitive **airway management**.
*Administer intravenous magnesium sulphate 40 mg/kg over 20 minutes*
- **Intravenous magnesium sulphate** is recommended for severe or life-threatening asthma refractory to initial bronchodilators, but it does not address the immediate need for **airway support** in a child showing signs of **exhaustion**.
- In a patient with imminent **respiratory failure**, pharmacologic interventions should ideally be given while simultaneously preparing for **intubation** and **ventilatory support**, not as a delaying step.
*Commence intravenous aminophylline loading dose followed by infusion*
- **Aminophylline** is typically reserved as a later-line agent due to its narrow therapeutic index, potential for significant **toxicity** (e.g., arrhythmias, seizures), and less robust evidence for superiority over other treatments.
- It is an inappropriate immediate next step in a patient exhibiting clear signs of **respiratory exhaustion** and impending failure, where the priority is rapid **airway control** and **ventilatory support**.
Question 94: A 17-month-old child presents with a 72-hour history of fever up to 40.2°C. The parents report the child has had no other symptoms except mild irritability and reduced appetite. Examination reveals an alert child with temperature 39.7°C, heart rate 155 bpm, respiratory rate 35/min, capillary refill time <2 seconds. There is no rash, no focus of infection identified, and the child appears well hydrated. Urine dipstick is negative. What is the most appropriate next management step according to NICE traffic light system?
A. Provide safety-net advice and arrange review in 24 hours
B. Admit for observation and perform blood tests including full blood count and C-reactive protein (Correct Answer)
C. Prescribe oral antibiotics and review in 48 hours if not improving
D. Perform chest radiograph to exclude occult pneumonia
E. Arrange urgent paediatric assessment within 2 hours
Explanation: ***Admit for observation and perform blood tests including full blood count and C-reactive protein***
- According to the **NICE Traffic Light System**, a fever of 40.2°C for 72 hours in a 17-month-old child, without an identifiable source, represents an **amber** feature, necessitating further investigation for **serious bacterial infection (SBI)**.
- Admission allows for close observation and monitoring, while blood tests like **full blood count (FBC)** and **C-reactive protein (CRP)** are crucial initial investigations to help identify signs of occult infection.
*Provide safety-net advice and arrange review in 24 hours*
- This approach is typically reserved for children exhibiting only **green (low risk)** features, where a specific cause for the fever has been identified and the child appears otherwise well.
- The child's persistent very high fever without a clear focus is an **amber** feature, indicating a higher risk that requires more active management than simple safety-netting and delayed review.
*Prescribe oral antibiotics and review in 48 hours if not improving*
- Empirical antibiotic therapy is not appropriate for a fever without a known focus unless there are clear clinical indicators strongly suggesting **bacterial infection**.
- Prescribing antibiotics without a diagnosis can mask symptoms, delay appropriate management for conditions like **meningitis** or **Kawasaki disease**, and contribute to **antimicrobial resistance**.
*Perform chest radiograph to exclude occult pneumonia*
- A chest radiograph is generally not indicated in children with fever without a focus unless there are specific **respiratory signs** such as tachypnoea, chest indrawing, or focal crackles on auscultation.
- The child in this case has a normal respiratory rate and no other signs of respiratory distress, making a chest radiograph less of an immediate priority than broader investigations for occult infection.
*Arrange urgent paediatric assessment within 2 hours*
- Referral for urgent paediatric assessment (within 2 hours) is reserved for children with **red (high risk)** features, such as signs of shock, non-blanching rash, altered consciousness, or significant respiratory distress.
- While the child has a high fever, they are described as **alert**, well-hydrated, and have a normal **capillary refill time**, which do not meet the criteria for a red traffic light feature requiring immediate emergency assessment.
Question 95: What is the recommended time interval for administering back-to-back salbutamol inhalers via spacer device in a child presenting with acute asthma to the emergency department?
A. One puff every 30 seconds until symptoms improve
B. Two puffs every 2 minutes for three cycles
C. Two puffs every 30-60 seconds up to 10 puffs (Correct Answer)
D. One puff every minute for 10 minutes
E. Four puffs initially then two puffs every 4 minutes
Explanation: ***Two puffs every 30-60 seconds up to 10 puffs***
- According to **BTS/SIGN guidelines**, the recommended protocol for acute asthma mimics the efficacy of nebulization by delivering **metered-dose inhaler (MDI)** puffs at frequent intervals.
- Administering **two puffs** (approx. 200 mcg) every **30-60 seconds** ensures rapid bronchodilation while providing the patient time to take adequate breaths through the **spacer** between actuations.
*One puff every 30 seconds until symptoms improve*
- Standard guidelines specify a maximum of **10 puffs** per cycle rather than an indefinite delivery until symptoms resolve.
- Giving only **one puff** may result in sub-therapeutic dosing in the initial critical minutes of an acute presentation.
*Two puffs every 2 minutes for three cycles*
- A **2-minute interval** is unnecessarily long for initial rescue therapy in the emergency setting and delays achieving peak bronchodilation.
- This frequency does not align with the standard **back-to-back delivery** model used for moderate-to-severe acute exacerbations.
*One puff every minute for 10 minutes*
- This approach is too slow for an **emergency presentation**, as it would take 10 minutes to deliver the same dose that can be safely given in 5 minutes.
- Higher doses delivered more rapidly are preferred in the **acute phase** to stabilize the airway and reduce work of breathing.
*Four puffs initially then two puffs every 4 minutes*
- There is no clinical evidence supporting this specific **loading dose** and maintenance interval for pediatric acute asthma in the ED.
- This regimen lacks the standardized continuous delivery of **up to 10 puffs** required for those failing to respond to initial treatment.
Question 96: A 7-month-old infant is brought to the emergency department with a 4-hour history of fever of 39.5°C and increased irritability. The infant was born at term with no complications and immunisations are up to date. On examination, the infant is crying inconsolably, has a bulging anterior fontanelle, and appears generally unwell. Temperature is 39.6°C, heart rate 170 bpm, respiratory rate 50/min, capillary refill time 2 seconds. What is the single most important immediate investigation?
A. Blood culture and full blood count
B. Lumbar puncture for cerebrospinal fluid analysis (Correct Answer)
C. Urine sample for microscopy and culture
D. Chest radiograph
E. CT scan of the head
Explanation: ***Lumbar puncture for cerebrospinal fluid analysis***
- A **bulging anterior fontanelle**, high fever, and inconsolable crying in an infant are classic red flags for **bacterial meningitis**.
- **Lumbar puncture** is the definitive investigation to confirm the diagnosis and identify the **causative pathogen** to guide targeted antibiotic therapy.
*Blood culture and full blood count*
- These are essential components of a **sepsis screen** to check for systemic infection and bacteremia.
- While they support the clinical picture, they lack the **specificity and diagnostic certainty** of CSF analysis for central nervous system infections.
*Urine sample for microscopy and culture*
- Testing for **urinary tract infections (UTI)** is routine in febrile infants to find a potential source of infection.
- However, clinical signs like a **bulging fontanelle** point directly toward intracranial pathology, making it secondary to spinal fluid analysis.
*Chest radiograph*
- Indicated if there are signs of **respiratory distress** or abnormal findings on chest auscultation suggesting pneumonia.
- In the absence of respiratory symptoms, it will not contribute to the diagnosis of a suspected **central nervous system infection**.
*CT scan of the head*
- Usually performed prior to lumbar puncture if there are signs of **raised intracranial pressure** (e.g., focal neurological deficits, significantly reduced consciousness).
- In an infant with an open fontanelle, the fontanelle acts as a **pressure-release valve**, and a CT scan would only cause a dangerous delay in initiating treatment for meningitis.
Question 97: A 4-year-old girl with known asthma presents to the emergency department with wheeze and increased work of breathing. She is able to talk in short sentences. Observations show: respiratory rate 38/min, heart rate 135 bpm, oxygen saturation 93% in air. She has widespread expiratory wheeze and moderate intercostal recession. After three doses of salbutamol via spacer and oral prednisolone, her oxygen saturation remains 93% and she still has moderate work of breathing. What is the most appropriate next step in management?
A. Change to nebulised salbutamol 2.5 mg
B. Add nebulised ipratropium bromide 250 micrograms (Correct Answer)
C. Continue salbutamol via spacer every 20 minutes and reassess
D. Commence intravenous magnesium sulphate infusion
E. Request senior review for consideration of intravenous aminophylline
Explanation: ***Add nebulised ipratropium bromide 250 micrograms***- This patient presents with features of **acute severe asthma** (SaO2 93%, tachycardia, tachypnoea, moderate intercostal recession) that has not improved after initial **salbutamol** via spacer and **oral prednisolone**.- According to guidelines (e.g., BTS/SIGN), adding an anticholinergic like **ipratropium bromide** to nebulised beta-agonists is the next recommended step for severe asthma attacks or those poorly responding to initial treatment.*Change to nebulised salbutamol 2.5 mg*- While transitioning to **nebulised delivery** of salbutamol is appropriate for severe asthma, simply switching the delivery method without adding **ipratropium bromide** is insufficient for a poor responder.- The combined use of **salbutamol and ipratropium bromide** offers synergistic bronchodilation and is indicated when initial salbutamol alone is inadequate.*Continue salbutamol via spacer every 20 minutes and reassess*- The patient has already received three doses of salbutamol via spacer and oral steroids, with persistent **hypoxia (SaO2 93%)** and **moderate work of breathing**.- Continuing the same regimen without escalation risks further deterioration and delays more effective management for a severe, non-improving asthma attack.*Commence intravenous magnesium sulphate infusion*- **Intravenous magnesium sulphate** is typically reserved for children with **life-threatening asthma** or those with severe asthma refractory to combined nebulised therapy.- It is a **second-line parenteral** treatment and is usually considered after nebulised beta-agonists and anticholinergics have failed to achieve adequate response.*Request senior review for consideration of intravenous aminophylline*- **Intravenous aminophylline** is a later-line treatment, generally considered for patients in **intensive care** or those with severe or life-threatening asthma who have not responded to multiple other treatments.- It has a narrow **therapeutic index** and significant side effects, making it a treatment of last resort after other therapies have been exhausted.
Question 98: A 13-month-old infant presents with a 2-day history of coryzal symptoms and low-grade fever. Today the parents noticed inspiratory stridor that worsens when the child cries. The child is alert, playing, and able to drink normally. Temperature is 37.8°C, respiratory rate 32/min, heart rate 115 bpm, oxygen saturation 98% in air. There is mild subcostal recession and occasional inspiratory stridor at rest. What is the most appropriate immediate management?
A. Oral dexamethasone 0.15 mg/kg as a single dose (Correct Answer)
B. Nebulised budesonide 2 mg
C. Nebulised adrenaline 5 ml of 1:1000 solution
D. Oral prednisolone 1 mg/kg for 3 days
E. Intramuscular adrenaline 0.01 mg/kg of 1:1000 solution
Explanation: ***Oral dexamethasone 0.15 mg/kg as a single dose***
- This child has **croup** (laryngotracheobronchitis), and clinical guidelines recommend a single dose of **oral dexamethasone** for all children presenting with any degree of severity.
- A dose of **0.15 mg/kg** is effective in reducing laryngeal edema and the need for further hospital intervention or repeat visits.
*Nebulised budesonide 2 mg*
- This is an alternative treatment used if the child is **unable to tolerate** oral medications or if they are vomiting.
- It is not the first-line choice when the child is **alert and drinking normally**, as oral administration is less distressing.
*Nebulised adrenaline 5 ml of 1:1000 solution*
- Reserved for **moderate to severe croup** where there is significant respiratory distress or impending airway obstruction.
- It provides rapid but **temporary relief** of symptoms and must always be followed by steroid administration.
*Oral prednisolone 1 mg/kg for 3 days*
- While prednisolone is an alternative steroid, a **single dose** of dexamethasone is preferred due to its **longer half-life**.
- A **3-day course** is generally unnecessary for mild croup, as the symptoms usually peak and resolve quickly after a single steroid dose.
*Intramuscular adrenaline 0.01 mg/kg of 1:1000 solution*
- This is the emergency treatment for **anaphylaxis**, which presents with wheeze, urticaria, or angioedema rather than isolated stridor.
- It has no role in the management of **viral croup** unless there is a complete airway emergency where nebulization is impossible.
Question 99: A 2-year-old boy presents to the emergency department with a 6-hour history of fever of 39.8°C. His mother reports he has been irritable and refusing to eat. On examination, he has a capillary refill time of 4 seconds, heart rate 165 bpm, respiratory rate 45/min, and blood pressure 85/50 mmHg. His peripheries are cool and mottled. What is the most appropriate initial fluid bolus management?
A. 10 ml/kg 0.9% sodium chloride over 10 minutes
B. 20 ml/kg 0.9% sodium chloride over 10-15 minutes (Correct Answer)
C. 10 ml/kg 4.5% human albumin solution over 30 minutes
D. 20 ml/kg 0.45% sodium chloride with 5% dextrose over 20 minutes
E. 15 ml/kg Hartmann's solution over 60 minutes
Explanation: ***20 ml/kg 0.9% sodium chloride over 10-15 minutes***
- The child's clinical presentation (prolonged **capillary refill time**, **tachycardia**, **tachypnea**, **hypotension**, and **cool, mottled peripheries**) indicates **septic shock**, necessitating rapid **volume expansion**.
- Guidelines for pediatric shock management recommend an initial bolus of **20 ml/kg** of an **isotonic crystalloid** like **0.9% sodium chloride**, administered rapidly over **5-15 minutes**.
*10 ml/kg 0.9% sodium chloride over 10 minutes*
- While 0.9% sodium chloride is appropriate, a **10 ml/kg** bolus is generally considered **insufficient** for initial resuscitation in a child with signs of **uncompensated shock**.
- This smaller volume might be considered for patients at high risk of **fluid overload**, such as those with underlying **cardiac or renal disease**, which is not evident here.
*10 ml/kg 4.5% human albumin solution over 30 minutes*
- **Crystalloids** are the preferred first-line fluids for initial resuscitation in pediatric shock; **colloids** like albumin are not typically recommended as the primary initial choice.
- Administering the fluid over **30 minutes** is **too slow** for a child presenting with **hypotensive shock**, who requires rapid hemodynamic stabilization.
*20 ml/kg 0.45% sodium chloride with 5% dextrose over 20 minutes*
- **0.45% sodium chloride** is a **hypotonic solution** and is contraindicated for fluid resuscitation due to the risk of inducing **cerebral edema** from fluid shifts.
- **Dextrose-containing fluids** are used for maintenance therapy or to treat hypoglycemia, not for rapid **bolus resuscitation** in circulatory collapse.
*15 ml/kg Hartmann's solution over 60 minutes*
- Although Hartmann's solution is an appropriate **isotonic crystalloid**, the volume of **15 ml/kg** is suboptimal compared to the recommended 20 ml/kg for initial shock.
- Administering the bolus over **60 minutes** is dangerously slow and would significantly delay critical resuscitation in a child with **hypotension** and poor perfusion.
Question 100: A 5-year-old boy is brought to the emergency department during an acute asthma attack. He has been given nebulised salbutamol and ipratropium bromide with oxygen, and oral prednisolone. After 30 minutes, he remains in severe respiratory distress. He is speaking single words only, respiratory rate 46 breaths/minute, heart rate 148 bpm, oxygen saturation 91% on 15 litres oxygen via non-rebreathe mask. A blood gas is performed showing: pH 7.31, pCO2 6.8 kPa, pO2 8.9 kPa, base excess -1, bicarbonate 24 mmol/L. What is the most critical implication of this blood gas result?
A. The hypoxaemia indicates need for immediate CPAP therapy
B. The metabolic acidosis suggests tissue hypoperfusion requiring fluid resuscitation
C. The rising pCO2 indicates tiring and impending respiratory failure (Correct Answer)
D. The normal pH indicates adequate compensation and stable condition
E. The base excess is normal so no additional intervention is required
Explanation: ***The rising pCO2 indicates tiring and impending respiratory failure***
- In acute asthma, initial **hyperventilation** often leads to a **low pCO2** due to increased work of breathing. A high pCO2 of **6.8 kPa** in this severely distressed child, who is failing initial treatment, strongly indicates **respiratory muscle fatigue** and inadequate ventilation, signifying impending respiratory failure.
- This finding, coupled with a pH of **7.31** (respiratory acidosis), is a critical sign of **life-threatening asthma** requiring immediate senior intervention and potential advanced airway management.
*The hypoxaemia indicates need for immediate CPAP therapy*
- While the patient is hypoxemic (O2 saturation 91% on high-flow oxygen), **CPAP** is generally not the first-line treatment for acute asthma in children and can worsen air trapping and increase the risk of **pneumothorax**.
- Management should prioritize aggressive pharmacological bronchodilation (e.g., IV magnesium sulfate, IV salbutamol) and, if necessary, **mechanical ventilation** as a definitive measure.
*The metabolic acidosis suggests tissue hypoperfusion requiring fluid resuscitation*
- The blood gas results show a **base excess of -1** and a **bicarbonate of 24 mmol/L**, both of which are within normal limits. This indicates there is no significant **metabolic acidosis**.
- The primary acidosis is respiratory, and there is no evidence of tissue hypoperfusion warranting fluid resuscitation, which could potentially overload the patient.
*The normal pH indicates adequate compensation and stable condition*
- A pH of **7.31** is actually **acidic**, falling below the normal range of 7.35-7.45. This indicates an uncompensated or poorly compensated **respiratory acidosis**.
- A rising pCO2 in severe asthma, regardless of the pH (which can be deceptively normal in some stages of respiratory failure), always signals an **exhausted child** and a rapidly deteriorating, unstable condition.
*The base excess is normal so no additional intervention is required*
- While a **normal base excess** correctly identifies the absence of a significant metabolic derangement, it does not rule out severe and life-threatening **ventilatory failure**.
- The combination of severe clinical distress and a dangerously high pCO2 mandates **urgent and aggressive intervention**, despite the normal base excess.
