If you've been searching for what are the characteristics of shock pals quizlet, you're already thinking like a PALS candidate who takes certification seriously. Shock in the pediatric patient is one of the most heavily tested concepts on the PALS exam, and understanding its four major types — hypovolemic, distributive, cardiogenic, and obstructive — along with their distinguishing clinical signs, is absolutely essential. Recognizing tachycardia, altered mental status, weak or absent peripheral pulses, prolonged capillary refill, and cool or mottled skin will help you identify compensated shock before it deteriorates into uncompensated or irreversible stages.
If you've been searching for what are the characteristics of shock pals quizlet, you're already thinking like a PALS candidate who takes certification seriously. Shock in the pediatric patient is one of the most heavily tested concepts on the PALS exam, and understanding its four major types — hypovolemic, distributive, cardiogenic, and obstructive — along with their distinguishing clinical signs, is absolutely essential. Recognizing tachycardia, altered mental status, weak or absent peripheral pulses, prolonged capillary refill, and cool or mottled skin will help you identify compensated shock before it deteriorates into uncompensated or irreversible stages.
PALS, or Pediatric Advanced Life Support, is an American Heart Association (AHA) certification program designed to equip healthcare providers with the skills to recognize and manage life-threatening emergencies in infants and children. The course covers cardiac arrest algorithms, respiratory emergencies, shock management, arrhythmia identification, and post-cardiac arrest care. Nurses, physicians, paramedics, and respiratory therapists working in pediatric or emergency settings are among the most common candidates who pursue this credential.
Quizlet has become one of the most popular supplemental study tools for PALS candidates. The platform's digital flashcard format makes it easy to drill on clinical definitions, algorithm steps, drug dosages, and rhythm recognition at any time and from any device. However, not all Quizlet decks are created equal — some contain outdated or inaccurate information based on older AHA guidelines. This guide will help you identify the most important concepts to study and point you toward high-quality practice resources.
One of the keys to PALS success is understanding that the exam is scenario-based, not purely memorization-based. You will be presented with a clinical scenario describing a child's presenting signs — heart rate, blood pressure, respiratory rate, skin color, and mental status — and asked to identify the problem and select the most appropriate intervention. Drilling on flashcards alone is not sufficient; you need to practice applying concepts in simulated case scenarios to build the clinical reasoning skills the exam demands.
This article functions as a comprehensive PALS Quizlet study guide, covering shock characteristics, cardiac rhythms, airway management, medication dosing, and exam strategies. You'll also find free practice quiz tiles embedded throughout to help reinforce your knowledge as you read. Whether you're preparing for your initial certification or a renewal, this guide is structured to support your study plan from start to finish. Be sure to also check the pals quizlet resource page for additional certification prep information.
The AHA updates its PALS guidelines periodically, and the most recent major revision occurred in 2020, with supplemental updates in subsequent years. Make sure any Quizlet deck you study from explicitly references the 2020 AHA Guidelines for CPR and ECC. Content based on 2015 or older guidelines may contain drug dosing errors, outdated algorithm sequences, or deprecated interventions that will not match the current exam. When in doubt, cross-reference your Quizlet cards against the official AHA PALS Provider Manual.
Throughout this guide, we will walk through each major PALS topic cluster — shock recognition and management, arrhythmia identification, airway and respiratory emergencies, cardiac arrest algorithms, and post-resuscitation care — with the depth and specificity you need to answer both knowledge-recall and scenario-based exam questions with confidence. Let's get started with the numbers that define this certification and what it takes to pass.
Understanding what are the characteristics of shock in PALS requires you to think about shock not as a single diagnosis but as a spectrum of circulatory failure that can arise from four distinct mechanisms. Hypovolemic shock is the most common type in pediatric patients and results from a reduction in intravascular volume due to dehydration, hemorrhage, or fluid losses from burns or gastrointestinal illness. Clinical signs include tachycardia, decreased urine output, dry mucous membranes, sunken fontanelle in infants, and progressively worsening skin perfusion with prolonged capillary refill time greater than two seconds.
Distributive shock, which encompasses septic shock, anaphylactic shock, and neurogenic shock, is characterized by pathological vasodilation that leads to maldistribution of blood flow despite normal or even elevated cardiac output. Septic shock is the most commonly tested form and presents with a wide pulse pressure, warm and flushed skin in the early hyperdynamic phase, bounding peripheral pulses, and fever. As septic shock progresses to the cold phase, the clinical picture shifts to cool extremities, weak pulses, and significant hemodynamic instability requiring aggressive fluid resuscitation and vasoactive support.
Cardiogenic shock occurs when the heart fails as a pump, leading to reduced cardiac output and elevated filling pressures. Unlike hypovolemic shock where aggressive fluid resuscitation is the cornerstone of treatment, cardiogenic shock patients may worsen with excessive fluid loading. Key clinical signs include tachycardia, hepatomegaly, pulmonary edema with crackles on auscultation, a gallop rhythm on cardiac exam, jugular venous distension in older children, and signs of poor peripheral perfusion despite adequate volume status. Recognition of cardiogenic shock is critical because the treatment algorithm differs significantly from other shock types.
Obstructive shock arises when a physical obstruction prevents adequate cardiac output. The two most important causes in pediatric PALS are tension pneumothorax and cardiac tamponade. Tension pneumothorax presents with diminished breath sounds on the affected side, tracheal deviation away from the tension, hypotension, and distended neck veins. Treatment is immediate needle decompression. Cardiac tamponade presents with Beck's triad — hypotension, muffled heart sounds, and distended neck veins — and requires emergent pericardiocentesis. Both conditions are rapidly fatal if not recognized and treated immediately.
The concept of compensated versus uncompensated shock is one of the most clinically important distinctions in PALS. In compensated shock, the body's physiologic mechanisms — tachycardia, vasoconstriction, increased respiratory rate — maintain blood pressure within a normal range despite compromised perfusion. Blood pressure may appear deceptively normal, making compensated shock easy to miss if you focus only on the blood pressure reading. This is why PALS emphasizes a systematic approach to the primary assessment that evaluates airway, breathing, circulation, disability, and exposure sequentially.
In uncompensated shock, the body's compensatory mechanisms have been overwhelmed, and hypotension becomes evident. Pediatric patients in uncompensated shock deteriorate rapidly and are at high risk for cardiac arrest if not treated aggressively within minutes. Irreversible shock represents end-organ damage so severe that the patient will not survive despite resuscitative efforts. Recognizing the transition from compensated to uncompensated shock and intervening before that transition occurs is the central skill the PALS exam tests through its scenario-based question format.
For your Quizlet study sessions on shock, focus on creating cards that pair each shock type with its pathophysiology, clinical presentation, distinguishing features, and first-line treatment. For example: hypovolemic shock → 20 mL/kg isotonic fluid bolus, repeated up to 60 mL/kg in the first hour; septic shock → fluid resuscitation plus early vasopressors if fluid-refractory; cardiogenic shock → inotropic support, judicious fluid use; obstructive shock → treat the underlying cause immediately. Understanding these treatment principles at a mechanistic level will help you select the correct answer even in unfamiliar scenario presentations.
Bradycardia in the PALS context is defined as a heart rate that is too slow to maintain adequate cardiac output for the patient's age and clinical condition. The PALS Bradycardia Algorithm begins with assessing whether the bradycardia is causing cardiopulmonary compromise — signs include hypotension, altered mental status, sudden collapse, or signs of shock. If the child is hemodynamically stable, supportive care and monitoring are appropriate. If compromise is present, the algorithm directs providers to begin high-quality CPR if the heart rate is below 60 beats per minute with poor perfusion.
When CPR alone does not restore adequate perfusion, epinephrine is the first-line drug at a dose of 0.01 mg/kg IV or IO, repeated every 3 to 5 minutes. Atropine 0.02 mg/kg (minimum 0.1 mg, maximum 0.5 mg per dose) is indicated specifically for bradycardia caused by increased vagal tone or primary atrioventricular block. Transcutaneous pacing is reserved for cases unresponsive to medications or when a reversible cause such as complete heart block is identified. Common reversible causes of bradycardia include hypoxia, hypothermia, hyperkalemia, and toxin exposure.
The most critical skill in PALS tachycardia management is differentiating sinus tachycardia from supraventricular tachycardia (SVT). Sinus tachycardia is a physiologic response to fever, pain, hypovolemia, or anxiety and has a gradual onset with a rate that varies with activity or stimulation. SVT typically has an abrupt onset, a fixed rate usually above 180 bpm in infants or above 150 bpm in older children, a narrow QRS complex unless aberrant conduction is present, and absence of P waves or retrograde P waves buried in the QRS or following it.
For hemodynamically stable SVT, vagal maneuvers are the first intervention — ice to the face in infants, Valsalva maneuver in older children. If vagal maneuvers fail, adenosine 0.1 mg/kg rapid IV push (maximum 6 mg for the first dose) is the pharmacologic treatment of choice. Hemodynamically unstable SVT requires immediate synchronized cardioversion at 0.5 to 1 J/kg, escalating to 2 J/kg if the first dose is ineffective. Wide-complex tachycardia with a pulse that is likely ventricular tachycardia is treated with synchronized cardioversion if unstable, or amiodarone 5 mg/kg IV over 20 to 60 minutes if stable.
Pulseless cardiac arrest in children falls into two categories: shockable rhythms (ventricular fibrillation and pulseless ventricular tachycardia) and non-shockable rhythms (pulseless electrical activity and asystole). The PALS Pulseless Arrest Algorithm emphasizes high-quality CPR as the foundation of all resuscitation efforts, with a compression-to-ventilation ratio of 30:2 for single rescuers and 15:2 for two-rescuer pediatric CPR. Compression depth should be at least one-third the anterior-posterior chest diameter — approximately 1.5 inches in infants and 2 inches in children.
For shockable rhythms, defibrillation is delivered as soon as possible at an initial energy dose of 2 J/kg, escalating to 4 J/kg for subsequent shocks and up to 10 J/kg or adult doses thereafter. Epinephrine 0.01 mg/kg IV or IO is given every 3 to 5 minutes throughout the arrest. Amiodarone 5 mg/kg or lidocaine 1 mg/kg is added for VF or pVT refractory to defibrillation. For non-shockable rhythms (PEA and asystole), CPR and epinephrine are the primary interventions, focused on identifying and reversing the H's and T's — the reversible causes of cardiac arrest.
One of the most common reasons PALS candidates miss shock questions is focusing on blood pressure as the primary indicator. In compensated shock, blood pressure remains normal while perfusion is already critically compromised. Always assess heart rate, capillary refill time, skin color and temperature, mental status, and urine output together. A child with a normal blood pressure, tachycardia, and a capillary refill of 4 seconds is in shock — treat them accordingly.
PALS medication knowledge is one of the highest-yield study areas for the written exam, and Quizlet flashcards are an excellent tool for drilling on drug names, doses, routes, and indications. The most frequently tested medications include epinephrine, atropine, adenosine, amiodarone, lidocaine, magnesium sulfate, sodium bicarbonate, calcium chloride, and dextrose. Each of these drugs has specific indications, contraindications, and dosing calculations that you must be able to recall and apply in a pediatric weight-based context without a calculator in some exam scenarios.
Epinephrine is the single most important PALS drug and appears in multiple algorithms. The standard IV or IO dose for cardiac arrest, symptomatic bradycardia, and anaphylaxis is 0.01 mg/kg (0.1 mL/kg of the 0.1 mg/mL concentration), with a maximum single dose of 1 mg. For anaphylaxis treated via the intramuscular route, the concentration changes to 1 mg/mL (1:1000), and the dose is 0.01 mg/kg IM to the anterolateral thigh, maximum 0.5 mg. Confusing these concentrations is a common and potentially fatal error that PALS exam scenarios specifically test your ability to avoid.
Adenosine for SVT is given as a rapid IV push followed immediately by a 5 to 10 mL normal saline flush to ensure the drug reaches central circulation before it is metabolized, which occurs within seconds. The first dose is 0.1 mg/kg (maximum 6 mg), and the second dose is 0.2 mg/kg (maximum 12 mg) if the first dose is ineffective.
Adenosine must be given through the largest, most proximal IV access available — ideally antecubital or above — because peripheral distal IVs often do not deliver the drug fast enough to achieve therapeutic effect at the SA and AV nodes.
Amiodarone is used in PALS for both shockable pulseless arrest rhythms and for stable wide-complex tachycardia. For pulseless VF or pVT, amiodarone 5 mg/kg IV or IO is given as a rapid bolus after the third defibrillation attempt. For stable VT, amiodarone is given more slowly at 5 mg/kg over 20 to 60 minutes to reduce the risk of hypotension and bradycardia, which are well-known side effects. Amiodarone should not be combined with procainamide without expert consultation due to the risk of additive QT prolongation and torsades de pointes.
Magnesium sulfate 25 to 50 mg/kg IV or IO (maximum 2 g) is the treatment of choice for torsades de pointes (polymorphic VT associated with a prolonged QT interval) and for hypomagnesemia-induced arrhythmias. Calcium chloride 20 mg/kg IV is used for documented hypocalcemia, hyperkalemia, hypermagnesemia, or calcium channel blocker toxicity. Sodium bicarbonate 1 mEq/kg IV is indicated for severe metabolic acidosis, hyperkalemia, or tricyclic antidepressant overdose — but not as a routine resuscitation drug, as its use can paradoxically worsen intracellular acidosis if ventilation is inadequate.
Dextrose is a critical and often overlooked resuscitation medication in pediatric patients. Children have limited glycogen stores and can develop hypoglycemia rapidly during illness or cardiac arrest. The PALS course emphasizes checking blood glucose early in any seriously ill child. Treatment of hypoglycemia is 0.5 to 1 g/kg IV of dextrose — using D10W in neonates (5 to 10 mL/kg), D25W in infants (2 to 4 mL/kg), and D50W in children and adolescents (1 to 2 mL/kg). Failing to recognize and treat hypoglycemia in a critically ill child is a catastrophic and entirely preventable error.
When building your Quizlet medication decks, organize cards by drug class and indication rather than simply alphabetically. Group the cardiac arrest drugs (epinephrine, amiodarone, lidocaine) together, then the antiarrhythmics for stable rhythms (adenosine, amiodarone), then the electrolyte replacements (magnesium, calcium, dextrose, bicarbonate). This thematic organization mirrors how the PALS algorithms are structured and will help you retrieve the correct drug faster during scenario-based questions where time pressure is a factor in your decision-making process.
Post-cardiac arrest care, also known as post-resuscitation care, is a topic that receives increasing emphasis in PALS exams and represents a significant portion of written exam questions that many candidates underestimate during their preparation. After return of spontaneous circulation (ROSC) is achieved, the goal shifts from resuscitation to preventing secondary injury to the brain, heart, and other vital organs. The post-cardiac arrest period is characterized by a systemic inflammatory response, hemodynamic instability, and vulnerability to secondary insults that can undo the work of a successful resuscitation.
Targeted temperature management (TTM), previously called therapeutic hypothermia, is one of the most important post-ROSC interventions for pediatric patients who remain comatose after cardiac arrest. The current AHA recommendation supports maintaining a constant temperature between 32°C and 34°C for 24 to 48 hours in children who remain unresponsive after ROSC, followed by controlled rewarming. Alternatively, maintaining normothermia at 36°C to 37.5°C is an acceptable approach when resources for active cooling are not available. What is absolutely contraindicated is allowing the child to become febrile — even a temperature above 38°C significantly worsens neurologic outcomes after cardiac arrest.
Hemodynamic optimization after ROSC focuses on maintaining adequate mean arterial pressure, oxygen delivery, and avoidance of hypotension. The PALS course recommends targeting systolic blood pressure at or above the fifth percentile for age and avoiding both hypoxia (SpO2 below 94%) and hyperoxia (SpO2 above 99% in the post-arrest period). Continuous waveform capnography, which measures end-tidal CO2, is used to guide ventilation in intubated patients with a target PaCO2 of 35 to 45 mmHg in most patients, avoiding both hyperventilation (which causes cerebral vasoconstriction) and hypoventilation (which worsens acidosis).
Glucose management in post-arrest care is another high-yield PALS topic. Both hypoglycemia and marked hyperglycemia are associated with worse neurologic outcomes after pediatric cardiac arrest. The AHA recommends monitoring blood glucose frequently after ROSC and treating hypoglycemia immediately while avoiding aggressive insulin protocols that can cause iatrogenic hypoglycemia. This reflects a shift away from the tight glycemic control protocols that were popular in ICU medicine during the 2000s but were subsequently shown to cause harm through hypoglycemic episodes in critically ill patients.
Seizure detection and management is an important component of post-cardiac arrest care that is often undertested in traditional study resources. Seizures after cardiac arrest may be subclinical (non-convulsive) and detectable only by continuous EEG monitoring. The PALS course recommends considering EEG monitoring in comatose patients after cardiac arrest and treating both clinical and electrographic seizures aggressively, as seizure activity increases cerebral metabolic demand at a time when the injured brain has limited capacity to meet that demand. Benzodiazepines are first-line treatment, followed by phenobarbital or levetiracetam for refractory seizures.
Family-centered care and communication is a component of the PALS curriculum that surprises some candidates who expect the course to focus exclusively on clinical algorithms. The AHA recognizes that how providers communicate with families during and after a pediatric resuscitation is a critical component of care. Family presence during resuscitation, when feasible and desired by the family, has been shown to reduce parental anxiety and post-traumatic stress and does not negatively impact team performance. Designating a team member to support the family during resuscitative efforts is a recommended best practice in the PALS provider framework.
For all of these post-resuscitation topics, Quizlet decks can be highly effective if the cards are designed to include clinical decision points rather than just isolated facts. For example, a card that asks "What temperature range defines targeted temperature management in comatose post-arrest pediatric patients?" is more exam-relevant than one that simply asks "What is TTM?" As you build or curate your PALS Quizlet study materials, consistently frame questions in the scenario-based format the actual exam uses to maximize the transfer of your preparation to real test performance.
Airway management is the first priority in any critically ill pediatric patient and represents one of the most heavily weighted topic areas across all PALS exam components. The systematic approach begins with assessing whether the airway is patent, whether the patient is making adequate respiratory effort, and whether the minute ventilation being achieved is sufficient to maintain oxygenation and ventilation. In a child with respiratory distress, the early use of supplemental oxygen via non-rebreather mask or high-flow nasal cannula can prevent deterioration to respiratory failure and cardiac arrest.
The decision to perform endotracheal intubation in a PALS scenario is guided by whether less invasive measures have failed or are likely to fail, whether there is a need for prolonged airway protection, or whether the clinical situation mandates a definitive airway for safe transport or procedural intervention. Rapid sequence intubation (RSI) using sedation and neuromuscular blockade is the standard technique for non-arrest intubation in children. The PALS course emphasizes pre-oxygenation, preparation of equipment including a second laryngoscope and a smaller-sized ETT, and confirmation of tube placement using waveform capnography as the gold standard method.
Bag-mask ventilation (BMV) is a foundational PALS skill that must be performed correctly to deliver effective ventilations during resuscitation. Common errors include applying excessive mask pressure that distorts the airway, failure to achieve a proper two-handed mask seal using the EC-clamp technique, delivering excessive tidal volumes that cause gastric inflation and aspiration risk, and ventilating too rapidly which increases intrathoracic pressure and reduces venous return.
The PALS course recommends delivering breaths over one second with enough volume to produce visible chest rise, at a rate of one breath every 2 to 3 seconds during CPR (20 to 30 breaths per minute for infants and children).
Supraglottic airway devices (SGAs) such as the laryngeal mask airway (LMA) are acceptable alternatives to endotracheal intubation when bag-mask ventilation is difficult and intubation is not immediately feasible. SGAs do not protect against aspiration and are not ideal for patients with active vomiting or significant pulmonary compliance issues, but they can be lifesaving bridge devices when used by providers who may not perform intubations frequently enough to maintain high proficiency. Knowing the indications, advantages, and limitations of SGAs relative to ETT intubation is a topic that appears regularly in PALS scenario-based questions.
Cricothyrotomy, while rarely performed in pediatric patients, is the rescue airway of last resort when all other attempts to secure the airway have failed and oxygenation cannot be maintained by any other means. In children under 8 years old, needle cricothyrotomy with jet insufflation is preferred over surgical cricothyrotomy due to the small size of the pediatric cricothyroid membrane.
PALS candidates are expected to know this technique conceptually even though they will not be required to perform it in the hands-on skills stations of most provider courses. Understanding these rescue techniques reflects the PALS philosophy of preparation for the full spectrum of pediatric emergencies.
For your PALS airway Quizlet deck, focus on cards that test decision-making rather than pure recall. For example: "A 6-month-old infant in respiratory failure has SpO2 of 82% despite 15 L/min oxygen via non-rebreather mask. What is your next intervention?" The answer is bag-mask ventilation, and knowing why — because the infant's own respiratory effort is insufficient to maintain oxygenation and external positive-pressure ventilation is needed — is more valuable than simply memorizing that BMV follows NRB mask in an algorithm flowchart. This depth of understanding is what separates high scorers from those who barely pass.
Team dynamics and communication during PALS scenarios are evaluated during the hands-on skills stations and megacode component of the course. Effective resuscitation teams use closed-loop communication — the team leader states an order, the team member repeats it back, performs the task, and confirms completion. This communication pattern reduces errors in high-stress environments where cognitive overload is common. PALS also emphasizes the role of the team leader in preventing cognitive fixation by actively seeking input from team members, conducting regular reassessment of patient response, and adapting the treatment plan based on evolving clinical information.