Special Cardiac Populations: Pediatric, Geriatric, and Pregnancy-Related Considerations
Objective. Learner will adapt cardiac assessment and resuscitation approaches for pediatric patients, older adults, and pregnant patients, recognizing the physiological differences that alter presentation and management.
This lesson, its worked examples and its practice questions has not yet been verified by a licensed clinician in the field or by a certification or approval body. It is a study draft and may contain errors. Do not use it to make decisions about any patient or medication. Always follow your instructor, your supervising professional, and current official references and regulations.
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Why Cardiac Patients Are Not One-Size-Fits-All
Cardiac emergencies look and behave differently depending on a patient's age and physiological state. The paramedic who applies adult-centric thinking to a six-month-old in cardiac arrest or a pregnant woman with palpitations risks missing the diagnosis and delivering harmful care. Recognizing how anatomy, physiology, and pharmacology shift across the lifespan is foundational to safe, effective prehospital practice.
Pediatric Cardiac Considerations
Children are not small adults. The pediatric heart is more dependent on heart rate than on stroke volume to maintain cardiac output. Because ventricular compliance is limited in infants and young children, they cannot significantly increase stroke volume on demand; instead, they compensate through tachycardia. This means any rhythm that drops the rate—such as bradycardia from hypoxia—rapidly compromises output and can precipitate arrest.
Normal vital sign ranges shift significantly with age. An infant's resting heart rate may normally be 100–160 beats per minute; a rate of 70 bpm that looks normal in an adult is bradycardic and potentially dangerous in a newborn. Respiratory rate is also faster in children, and blood pressure is lower. Always compare findings against age-appropriate normals, using a reliable reference such as a Broselow tape or your textbook's pediatric vital sign table.
ECG characteristics in children include a faster baseline rate, shorter PR and QRS intervals, and common presence of sinus arrhythmia (rate variation with breathing), which is normal. The most common life-threatening pediatric dysrhythmia is supraventricular tachycardia (SVT), typically presenting with rates of 220 bpm or higher in infants and often appearing as a narrow-complex tachycardia with no visible P waves. Ventricular fibrillation is less common in children than in adults; primary cardiac causes of arrest are less frequent, and respiratory failure is the most common underlying trigger.
Resuscitation differences: CPR compression depth and rate targets are age-adjusted. Energy doses for defibrillation and cardioversion are weight-based (joules per kilogram), not fixed adult doses—always use your local protocol and a weight-based reference. Medication doses are calculated per kilogram; a Broselow tape or equivalent tool helps estimate weight when parents cannot provide it. Vascular access follows protocol hierarchy; intraosseous access is an acceptable and rapid alternative when IV access fails.
Safety point: Hypoxia is the most common cause of pediatric cardiac arrest. Airway and breathing management must be prioritized before and throughout resuscitation.
Geriatric Cardiac Considerations
Older adults experience predictable age-related changes that alter how cardiac emergencies present. Cardiac muscle stiffens with age, diastolic function declines, and the sinoatrial node loses pacemaker cells, predisposing patients to bradyarrhythmias and conduction disease. Complete heart block and sick sinus syndrome are more common in elderly patients than in any other age group.
Atherosclerotic disease is nearly universal by advanced age, making acute coronary syndrome (ACS) a primary concern. However, older adults frequently present atypically: they may describe vague fatigue, syncope, or shortness of breath rather than classic crushing chest pain. Women and patients with diabetes are especially likely to present without chest pain. A high index of suspicion is essential.
ECG findings in the elderly may include left ventricular hypertrophy patterns, left bundle branch block (which complicates ST-elevation interpretation), prolonged PR intervals, and pacemaker artifacts if an implanted device is present. Pacemakers can mask underlying rhythms; look for pacemaker spikes and assess whether the device is capturing and sensing appropriately.
Pharmacokinetic changes affect drug management. Renal and hepatic function decline with age, slowing drug clearance. Body fat increases while lean mass decreases, altering drug distribution. Older patients are often on multiple medications (polypharmacy), creating interaction risks. These factors mean that standard adult doses may produce exaggerated or prolonged effects. Paramedics should be aware of medications the patient is already taking, particularly anticoagulants, antidysrhythmics, and beta-blockers.
Safety point: Elderly patients tolerate hemodynamic instability poorly. Err toward early intervention for symptomatic bradycardia or hypotension, and reassess frequently.
Cardiac Emergencies in Pregnancy
Pregnancy imposes significant cardiovascular demands. By the third trimester, maternal blood volume has increased by roughly 40–50%, cardiac output is elevated, and the enlarged uterus compresses the inferior vena cava when the patient lies supine. This aortocaval compression can dramatically reduce venous return and cardiac output, worsening any hemodynamic compromise.
Positioning is critical: Any pregnant patient beyond approximately 20 weeks gestation who requires supine positioning (e.g., for CPR) should have the uterus manually displaced to the left, or the patient should be tilted 15–30 degrees to the left using a wedge or rescuer's knees under the right hip. This relieves caval compression.
Common dysrhythmias in pregnancy include benign palpitations, premature beats, and occasionally SVT, which may be triggered by the increased circadian demand. The provider must weigh the risk to the fetus when considering any intervention, including medications.
In maternal cardiac arrest, standard BLS and ALS priorities apply, but left uterine displacement must be maintained during CPR. Resuscitation of the mother is the best intervention for the fetus. Local protocols and medical direction govern decisions about perimortem cesarean delivery, which is a hospital-level intervention.
Safety point: Never delay or withhold standard resuscitation for a pregnant patient out of concern for the fetus. Effective maternal resuscitation gives both patients the best chance.
Putting It Together
Across all three populations, the core principle is the same: gather a thorough, systematic assessment, interpret findings against the correct physiological baseline, and modify interventions to match the patient's specific physiology. Use your weight-based dosing references for pediatric patients, maintain a high index of suspicion in geriatric patients with atypical presentations, and never skip left lateral positioning considerations for the pregnant patient. Documentation of your reasoning is part of professional practice and supports continuity of care.
Key terms8
Materials: Pediatric and geriatric cardiology reference sections in the paramedic textbook, Broselow tape or weight-based dosing reference, printed case studies, comparison table worksheet
Check: Learner submits written case management plans for all three cases; each plan is graded on a 10-point rubric assessing accuracy of assessment, age-appropriate modifications, and management rationale; minimum score of 8 out of 10 on each case required to pass.
Practice check8
Answer each question, then check it. Nothing is recorded; this is your own practice.
