Pediatric CCRN Exam

This section builds that foundation. Expect any question, whether it is about a post-op cardiac infant or an adolescent in status asthmaticus, to test one of these general skills at the same time: the right sedation score, the correct maintenance rate, the first thing to check when an alarm sounds, or the safest way to confirm a dose. Detailed acid-base analysis and pain management are taught in Section 10; this section keeps those topics at the level of first-pass reading and age-appropriate tool selection.

This chapter covers the anatomic and physiologic differences that make children behave differently from adults when they become critically ill, along with the age-based normal ranges you need to judge every vital sign on the exam.

Children have less physiologic reserve, higher metabolic demand and different compensatory patterns. Infants and toddlers compensate strongly and quietly for a long time, then decompensate quickly. Most pediatric cardiac arrests are secondary to respiratory failure or shock, not primary cardiac events, so the nurse who catches the respiratory or circulatory problem early prevents the arrest.

Exam Tip: When a question shows a child with tachycardia, delayed capillary refill and a normal blood pressure, the test is asking whether you recognize compensated shock. Normal blood pressure does not mean adequate perfusion in a child.

Memory Aid: Children "fall off a cliff." Long compensation, then sudden collapse. Bradycardia and hypotension are late findings that mean the cliff edge has arrived.

Reference ranges differ slightly between sources and with sleep, fever and anxiety. Use the trend and the clinical picture, not one number in isolation. The following ranges are consistent with PALS teaching.

For a 6-year-old, the hypotension threshold is 70 + 12 = 82 mmHg. A systolic pressure of 80 mmHg in that child is hypotensive and signals decompensated shock.

Common Trap: Choosing a blood pressure cuff by convenience. A cuff that is too small reads falsely high; a cuff that is too large reads falsely low. The bladder width should be about 40% of the arm circumference and the bladder length about 80-100% of it.

Always use the measured weight in kilograms. In an emergency without a weight, a length-based resuscitation tape gives estimated weight, drug doses and equipment sizes by color zone. Document weight in kilograms only; recording pounds in one place and kilograms in another is a classic source of dosing error.

Bedside Scenario: A 9-month-old arrives from the emergency department with bronchiolitis. The handoff lists weight as "18" without units. The nurse recognizes that 18 kg is implausible for this age and 18 lb is about 8.2 kg. The nurse weighs the infant on a calibrated scale in kilograms before any medication or fluid rate is calculated, because every order depends on that number.

• Children compensate well and then decompensate suddenly; hypotension and bradycardia are late signs.
• Infant cardiac output depends on heart rate; bradycardia with poor perfusion is an emergency.
• Use age-based ranges and trends; hypotension in ages 1-10 is systolic BP below 70 + (2 x age).
• Small airways, high oxygen consumption and low functional residual capacity mean rapid desaturation.
• Weigh in kilograms and check that the weight makes sense for the age.