Cardiopulmonary Resuscitation (CPR) in Infants and Children

Bradycardia in a distressed child is a sign of impending cardiac arrest. Neonates, infants, and young children are more likely to develop bradycardia caused by hypoxemia, whereas older children initially tend to have tachycardia. An infant or child with a heart rate < 60/minute and signs of poor perfusion that do not rise with ventilatory support should have cardiac compressions (see figure Chest compression Chest compression in infants and children ). Bradycardia secondary to heart block is unusual.

During chest compressions in infants and children (below the age of puberty or < 55 kg), the chest should be depressed one third of the anteroposterior diameter. This is about 4 to 5 cm. In adolescents or children > 55 kg, the recommended compression depth is the same as in adults, ie, 5 to 6 cm.

Method of chest compression is also different in infants and children and is illustrated below. The rate of compression in infants and children is similar to that of adults at 100 to 120 compressions/minute.

After adequate oxygenation and ventilation, epinephrine is the drug of choice (see First-line drugs First-line drugs Cardiopulmonary resuscitation (CPR) is an organized, sequential response to cardiac arrest, including Recognition of absent breathing and circulation Basic life support with chest compressions... read more ) and should be given as soon possible after establishment of intravenous (IV) or intraosseous (IO) access. Epinephrine dose is 0.01 mg/kg IV, which can be repeated every 3 to 5 minutes. Current guidelines advise immediate IO placement and epinephrine administration for nonshockable rhythms, as recent evidence indicates that restoration of spontaneous circulation (ROSC) and survival rate in children is correlated with the speed at which the first dose of epinephrine is received.

Amiodarone 5 mg/kg IV bolus can be given if defibrillation is unsuccessful after epinephrine. It may be repeated up to 2 times for refractory ventricular fibrillation Ventricular Fibrillation (VF) Ventricular fibrillation causes uncoordinated quivering of the ventricle with no useful contractions. It causes immediate syncope and death within minutes. Treatment is with cardiopulmonary... read more (VF) or pulseless ventricular tachycardia Ventricular Tachycardia (VT) Ventricular tachycardia is ≥ 3 consecutive ventricular beats at a rate ≥ 120 beats/minute. Symptoms depend on duration and vary from none to palpitations to hemodynamic collapse and death. Diagnosis... read more (VT). If amiodarone is not available, lidocaine may be given at a loading dose of 1 mg/kg IV followed by a maintenance infusion of 20 to 50 mcg/kg/minute. Neither amiodarone nor lidocaine have been shown to improve survival to hospital discharge.

Blood pressure (BP) should be measured with an appropriate-sized cuff, but direct invasive arterial BP monitoring is mandatory in severely compromised children.

Because BP varies with age, an easy guideline to remember the lower limits of normal for systolic BP (< 5th percentile) by age is as follows:

Thus, in a 5-year-old child, hypotension would be defined by a BP of < 80 mm Hg (70 + [2 × 5]). Of significant importance is that children maintain BP longer because of stronger compensatory mechanisms (increased heart rate, increased systemic vascular resistance). Once hypotension occurs, cardiorespiratory arrest may rapidly follow. All effort should be made to start treatment when compensatory signs of shock (eg, increased heart rate, cool extremities, capillary refill > 2 seconds, poor peripheral pulses) are present but before hypotension develops.

Equipment size, drug dosage, and CPR parameters vary with patient age and weight (see tables CPR Techniques for Health Care Practitioners CPR Techniques for Health Care Practitioners , Drugs for Resuscitation in Infants and Children Drugs for Resuscitation in Infants and Children* , and Guide to Pediatric Resuscitation Guide to Pediatric Resuscitation—Mechanical Measures ). Size-variable equipment includes defibrillator paddles or electrode pads, masks, ventilation bags, airways, laryngoscope blades, endotracheal tubes, and suction catheters. Weight should be measured rather than guessed; alternatively, commercially available measuring tapes that are calibrated to read standard patient weight based on body length can be used. Some tapes are printed with the recommended drug dose and equipment size for each weight. Dosages should be rounded down; eg, a 2 ½-year-old child should receive the dose for a 2-year-old child.

Susceptibility to heat loss is greater in infants and children because of a large surface area relative to body mass and less subcutaneous tissue. A neutral external thermal environment is crucial during CPR and postresuscitation. Hypothermia with core temperature < 35° C makes resuscitation more difficult.

For comatose children resuscitated from in-hospital and out-of-hospital cardiac arrest, recent American Heart Association and American Association of Pediatrics guidelines advise therapeutic hypothermia (32 to 36° C) or normothermia (36 to 37.5° C; 1, 2 Treatment references Despite the use of cardiopulmonary resuscitation (CPR), mortality rates for out-of-hospital cardiac arrest are about 90% for infants and children. Mortality rates for in-hospital cardiac arrest... read more ). Fever should be treated aggressively.

Upper airway anatomy is different in children. The head is large with a small face, mandible, and external nares, and the neck is relatively short. The tongue is large relative to the mouth, and the larynx lies higher in the neck and is angled more anteriorly. The epiglottis is long, and the narrowest portion of the trachea is inferior to the vocal cords at the cricoid ring, allowing the use of uncuffed endotracheal tubes. In younger children, a straight laryngoscope blade generally allows better visualization of the vocal cords than a curved blade because the larynx is more anterior and the epiglottis is more floppy and redundant. Current available evidence does not support improved patient outcomes from advanced airway interventions as compared to bag-mask ventilation in infants and children during out-of-hospital cardiac arrest.

If there is no advanced airway in place in infants and children undergoing resuscitation, the recommended compression:ventilation ratio is 30:2 if only a single rescuer is present and 15:2 if more than one rescuer is present. This recommendation is in contrast to adults where the compression:ventilation ratio is always 30:2 and is independent of the number of rescuers.

With an advanced airway in place, 1 breath is given every 6 seconds (10 breaths/minutes) for infants, children, and adults.

In asystole, atropine and pacing are not used.

Ventricular fibrillation Ventricular Fibrillation (VF) Ventricular fibrillation causes uncoordinated quivering of the ventricle with no useful contractions. It causes immediate syncope and death within minutes. Treatment is with cardiopulmonary... read more (VF) and pulseless ventricular tachycardia Ventricular Tachycardia (VT) Ventricular tachycardia is ≥ 3 consecutive ventricular beats at a rate ≥ 120 beats/minute. Symptoms depend on duration and vary from none to palpitations to hemodynamic collapse and death. Diagnosis... read more (VT) occur in about 15 to 20% of pediatric cardiac arrests. Vasopressin is not indicated. When defibrillation is used, the absolute energy dose is less than that for adults; waveform can be biphasic (preferred) or monophasic. For either waveform, the recommended energy dose is 2 joules/kg for the first shock, increasing to 4 joules/kg for subsequent attempts (if necessary— see defibrillation in adults Defibrillation Cardiopulmonary resuscitation (CPR) is an organized, sequential response to cardiac arrest, including Recognition of absent breathing and circulation Basic life support with chest compressions... read more ). The maximum recommended dose is 10 joules/kg or the maximum adult dose (200 joules for a biphasic defibrillator and 360 joules for a monophasic defibrillator).

Automated external defibrillators (AEDs) with adult cables may be used for children as young as 1 year, but an AED with pediatric cables (maximum biphasic shock of 50 joules) is preferred for children between 1 year and 8 years. There is insufficient evidence to recommend for or against the use of AEDs in children < 1 year. For pad placement, see defibrillation in adults Defibrillation Cardiopulmonary resuscitation (CPR) is an organized, sequential response to cardiac arrest, including Recognition of absent breathing and circulation Basic life support with chest compressions... read more .