If you are staring at the AHA HeartCode PALS simulator at 11 p.m. with three coffees on the desk and your provider card expiring next week, you already know the panic. The cases do not feel like the multiple-choice study guides. The clock keeps ticking. The mannequin keeps deteriorating. And Olivia Lopez, the 4-year-old with the worsening color and the lab printout, has become a small internet legend because so many nurses, paramedics, and respiratory therapists have failed her at least once.
This guide pulls together the HeartCode PALS answers learners actually need — not just the right button to click, but why that intervention follows from the rhythm strip, the vitals, and the AHA 2025 algorithm updates.
We will walk through the Olivia Lopez septic shock case step by step, decode the tachycardia and bradycardia decision trees, and show you the small habits (pulse check timing, fluid bolus volume, drug sequencing) that separate a clean first pass from a remediation loop. We will also flag the spots where the simulator is unforgiving — the places where one extra second of hesitation costs you the scenario.
You will not find a bullet-point answer key here. The AHA randomizes cases and rotates rhythms across the eCard release cycles, so a memorized click pattern from 2022 is not going to save you in 2026. What works is pattern recognition: read the patient, read the monitor, pick the algorithm, execute the order, reassess. This article is built to drill that loop until it feels boring.
One number worth pausing on: that 84% pass-rate jump after structured algorithm rehearsal. The AHA does not publish official simulator metrics, but instructor surveys across the 2024 PALS Update cycle showed a consistent pattern — candidates who walked through three or four practice scenarios before logging into HeartCode passed substantially more often than those who relied on the provider manual alone. The simulator rewards muscle memory, not knowledge recall. You need the algorithm so internalized that you are picking interventions before the timer judges you slow.
The 20 mL/kg figure matters because the simulator absolutely will dock you for picking 10 mL/kg or trying to push 30 mL/kg up front. AHA 2025 still anchors the initial septic shock bolus at 20 mL/kg of an isotonic crystalloid — Normal Saline or Lactated Ringer's — delivered over 5 to 10 minutes, with reassessment between boluses. That is the click you need queued up the moment Olivia's blood pressure drops.
Olivia is a 4-year-old female brought in by her mother for lethargy, decreased oral intake over 48 hours, and a fever of 39.4 C. Initial assessment: HR 168, RR 38, BP 78/42, capillary refill 4 seconds, mottled extremities, lactate 4.8.
This is compensated septic shock with cold-shock physiology. Your first move is not vasopressors. It is high-flow O2, IV access, and a 20 mL/kg isotonic bolus while sending cultures and starting broad-spectrum antibiotics within the first hour.
That summary box is the one piece of the Olivia case you should have memorized before launching the simulator. The mistake almost every learner makes is treating her like a straightforward shock patient and reaching for epinephrine too early. The AHA scoring engine flags premature vasopressor initiation as a serious deviation because — in real pediatric resuscitation — pushing pressors into an underfilled tank causes ischemic damage. The simulator is teaching you a clinical reflex, not just testing you.
Walk through the case in the order the system expects. Begin with the primary assessment — A, B, C, D, E — and click each one. Even when the airway is patent, you have to confirm it. Skipping the structured assessment is the second most common reason candidates fail Olivia. Then move to the secondary assessment with a focused SAMPLE history. The mother mentions a recent urinary tract infection that was partially treated. That detail is your antibiotic clue: think gram-negative coverage with ceftriaxone or a similar broad-spectrum agent.
After the first bolus, the simulator will offer a reassessment window. Her heart rate may drop slightly to 152, but capillary refill is still 3 seconds and the BP has only crept up to 82/44.
That is your trigger for a second 20 mL/kg bolus. Two boluses are appropriate before you should start worrying about fluid overload signs like hepatomegaly or rales. If after 40 to 60 mL/kg total she remains hypotensive, that is fluid-refractory shock and you move to the epinephrine drip — typically 0.05 to 0.3 mcg/kg/min for cold shock, or norepinephrine if the picture turns warm.
VF/pVT and asystole/PEA pathways. CPR, defibrillation at 2 then 4 J/kg, epinephrine every 3-5 minutes, reversible H's and T's check.
HR under 60 with poor perfusion. Oxygen and ventilation first, CPR if HR stays under 60 after airway, then epinephrine and atropine for vagal/AV block etiology.
Narrow vs wide QRS. SVT gets vagal maneuvers then adenosine 0.1 mg/kg. Unstable VT requires synchronized cardioversion at 0.5-1 J/kg.
Hypovolemic, distributive, cardiogenic, obstructive. Aggressive fluid resuscitation for the first three, cautious volume for cardiogenic.
Why these four? Because every HeartCode case maps onto one of them. The simulator may give you a 7-year-old in anaphylaxis or a 2-month-old in supraventricular tachycardia, but the decision tree is one of these four. When you launch a case, your first job is classification. Is this an arrest? A perfusing bradyarrhythmia? A perfusing tachyarrhythmia? A shock state? Get that label right within the first 30 seconds and the rest of the case becomes pattern matching against the algorithm.
The cardiac arrest pathway is the one most learners feel confident about because it overlaps heavily with adult ACLS. But there are pediatric-specific traps. The defibrillation dose escalates from 2 J/kg to 4 J/kg on the second shock, not from 200 J to 300 J like adults. Epinephrine remains 0.01 mg/kg IV/IO of the 1:10,000 concentration (0.1 mL/kg). Amiodarone is 5 mg/kg bolus for refractory VF/pVT, and you can repeat it up to three times. Lidocaine is the alternative at 1 mg/kg. Mix those numbers up and you fail the case.
Bradycardia is the algorithm that catches experienced ICU nurses off-guard because the pediatric reflex differs from adult medicine. In a child with a heart rate under 60 and signs of poor perfusion, the answer is not transcutaneous pacing first — it is oxygenation and ventilation. Most pediatric bradycardia is hypoxia-driven. Fix the breathing, the heart rate often corrects itself. Only if HR remains under 60 with poor perfusion despite adequate oxygen and ventilation do you begin CPR, then epinephrine, then atropine if vagal tone or primary AV block is suspected.
Cardiac arrest: 0.01 mg/kg IV/IO (0.1 mL/kg of 1:10,000) every 3-5 minutes. Bradycardia: same arrest dose. Anaphylaxis: 0.01 mg/kg IM (0.01 mL/kg of 1:1,000) up to 0.3 mg. Septic shock drip: 0.05-0.3 mcg/kg/min titrated to perfusion goals.
Refractory VF/pulseless VT: 5 mg/kg IV/IO bolus, may repeat to a max of 15 mg/kg in 24 hours. Stable VT or SVT not responsive to vagal/adenosine: 5 mg/kg over 20-60 minutes with continuous cardiac monitoring.
First dose: 0.1 mg/kg IV (max 6 mg). Second dose: 0.2 mg/kg IV (max 12 mg). Push fast through a proximal IV with a 10 mL saline flush. Watch for transient asystole on the rhythm strip — it is expected, not catastrophic.
Bradycardia from vagal stimulation or primary AV block: 0.02 mg/kg IV/IO (minimum 0.1 mg, maximum 0.5 mg). May repeat once. Not first-line for hypoxia-driven bradycardia — fix the breathing first.
Hypoglycemia in symptomatic child: 0.5-1 g/kg. Use D10W at 5-10 mL/kg in infants under 1 month, D25W at 2-4 mL/kg in older children. Avoid D50W in pediatrics — the osmolar load damages peripheral veins.
Notice how epinephrine appears in four different forms across four different scenarios. The simulator will absolutely confuse you with this if you have not drilled the concentrations. The 1:10,000 concentration (0.1 mg/mL) is what you pull for IV/IO arrest pushes. The 1:1,000 concentration (1 mg/mL) is the IM auto-injector strength for anaphylaxis. Mixing those up in a real code can kill a child — the simulator knows it, and it will dock you for the wrong concentration selection even if the milligram math looks right.
Adenosine deserves its own warning. The simulator tests whether you know to push it as a rapid bolus through a proximal IV, followed immediately by a saline flush. If you select the slow infusion option, the system will mark the rhythm as unconverted and downgrade the scenario. The reason in real life is pharmacokinetic: adenosine has a half-life under 10 seconds. If it does not slam into the AV node fast, it never gets there. The simulator models that physiology.
One more drug note: atropine is no longer first-line for unstable bradycardia in PALS. The 2020 update — still in force through 2026 — removed routine atropine pre-medication for emergency pediatric intubation, and atropine's role in bradycardia is now restricted to vagally-mediated rhythms (post-suctioning, post-laryngoscopy) or known primary AV block. The reflex of reaching for atropine first will fail you in HeartCode.
That warning is not exaggeration. Instructor data from 2024 remediation sessions consistently flagged "failure to reassess" as the top deviation across every case. The fix is mechanical: every time you complete an intervention, your next click should be the reassessment button. Even when you are 100% certain the patient is still unstable. Even when you are running the case in your sleep. Click. Reassess. Then move on.
Olivia Lopez is the case that punishes reassessment skipping the hardest because her presentation changes over time. After the first bolus, her perfusion may improve slightly. After the second, her mental status might lift. Without clicking reassessment, you will not see those changes — and you will keep escalating when the simulator expected you to hold and observe. The result is a fluid overload deduction or premature pressor deduction even though you knew the algorithm.
If you are practicing for HeartCode in the next week, build the habit by talking out loud as you click. "Bolus done. Reassessing A-B-C-D-E. Airway patent, breathing labored at 36, circulation: HR 152 BP 80/44 cap refill 3. Continuing fluid resuscitation." That narration mimics what the simulator wants you to demonstrate. When you can do it without thinking, you are ready for the test.
That quiz mirrors the rhythm-strip and algorithm-decision questions you will encounter in HeartCode's case debriefs. The simulator does not just want you to click the right intervention. It wants you to articulate why in the post-case debrief panel. The free quiz drills that reasoning layer — given a rhythm, given vitals, what is the next action? Doing 40 to 60 of those reps before launching the simulator dramatically reduces the cognitive load on test day.
One often-missed detail: the simulator awards partial credit. If you pick the right algorithm but the wrong drug dose, you do not get a zero on that step — you get a partial. That means even imperfect runs can pass overall if the high-weight steps (rhythm recognition, primary action, reassessment cadence) are right. Stop trying to be flawless. Aim for being algorithmically correct on the big swings.
The voice-recognition issue is worth a separate word. Several international candidates and non-native English speakers have reported the simulator failing to register verbal orders even when keystroke-equivalent commands are correct.
The workaround is to lean into the on-screen click options whenever the voice path fails. The AHA scoring engine does not penalize you for using click commands over voice — they are equivalent paths. Do not waste time arguing with the microphone when the buttons are right there.
HeartCode also has an underappreciated advantage. The case library lets you re-run scenarios until you pass each one. That is not cheating. That is how procedural memory is built.
Run Olivia three times back to back. The first run you will miss something. The second you will catch it but still be slow. The third you will execute it clean. Now you own that pattern for real-world resuscitation, which is the actual point of the certification.
For learners pairing PALS with other certifications, the cognitive overlap with the rhythm recognition and CPR mechanics transfers almost directly. If you are studying both certs in the same month, do PALS second. The pediatric dose adjustments are the hardest part, and adult resuscitation training will not interfere with that memory because it uses fixed milligram doses rather than weight-based dosing.
Block out two evenings for HeartCode. The first night, work through cases 1 through 5. The second night, work through 6 through 10. Trying to finish all ten in one sitting is how learners burn out at case 7 and start clicking through without thinking. Cognitive fatigue costs more points than gaps in knowledge.
A word on the lab values that show up across HeartCode cases. The simulator presents results in roughly the order a real ED would receive them — point-of-care glucose and lactate first, then a basic metabolic panel, then the full sepsis panel.
A lactate above 4 mmol/L is a fluid-responsiveness flag. A glucose below 60 mg/dL in a sick child needs a dextrose push before the next algorithm step. A potassium above 6.5 with peaked T-waves on the strip is your cue to think calcium gluconate and insulin-dextrose. Sodium matters too — severe hyponatremia with seizure activity needs 3% hypertonic saline, not normal saline.
One last piece of advice from instructors who run remediation sessions. The candidates who fail HeartCode PALS twice almost always share the same pattern. They studied the provider manual hard but never ran a simulator rehearsal before the real attempt. They expected the cases to feel like the practice questions. They did not.
The simulator is procedural — it rewards click sequences and timing — not just conceptual knowledge. Knowing the algorithm cold is necessary but not sufficient. You also need fingers that know where the buttons are.
Build a 90-minute pre-test session for yourself. Spend 30 minutes reviewing the four algorithm cards. Spend 30 minutes drilling drug doses with flashcards. Spend the last 30 minutes running through the Olivia Lopez case verbally, narrating every step as if you were the clinician in the room.
By the time you log into the real simulator, the patterns will feel automatic, and the AHA's timing thresholds will stop feeling tight. The cases will start to feel like routine resuscitation rather than a race against a clock you cannot see.
And when you pass — because you will pass — keep the algorithm cards on your phone. The provider course is two years long on paper, but real proficiency is built through quarterly drilling. The teams who hold the best pediatric resuscitation outcomes are not the ones with the most certifications. They are the ones who keep the algorithms warm between recertifications.
If you work in a unit that sees pediatric patients regularly, ask your educator about monthly mock codes. Twenty minutes of mock-code practice each month does more for outcomes than waiting two years and cramming for renewal. The certification card is the floor of competence, not the ceiling. HeartCode PALS gets you the card. The drills after the card are what make you good.
A final note about renewal timing. Most learners wait until the last month before card expiration to begin HeartCode prep. That works only if you are running pediatric resuscitations regularly at work. If you have not run a real PALS code in the past year, give yourself three full weeks for the cognitive portion and another week to schedule the skills session.
The skills session is in person at an AHA training center. Slots fill quickly in major metro areas. Booking only after you finish HeartCode is how candidates end up with a lapsed card despite passing the simulator on the first try. Book the skills session the moment you start HeartCode, not after.
Plan ahead — that small habit alone saves countless certifications each year.
Learn more in our guide on PALS Practice Test PDF (Free Printable 2026). Learn more in our guide on pals algorithms pdf. Learn more in our guide on pals certification.