Understanding the CPR procedure step by step can mean the difference between life and death when cardiac arrest strikes. Each year, more than 350,000 out-of-hospital cardiac arrests occur in the United States, and survival rates nearly double when a bystander begins immediate cardiopulmonary resuscitation. Whether you are pursuing an ACLS algorithm certification, studying for a national CPR foundation exam, or simply want to be prepared in an emergency, mastering the correct sequence of actions is essential before help arrives.
Understanding the CPR procedure step by step can mean the difference between life and death when cardiac arrest strikes. Each year, more than 350,000 out-of-hospital cardiac arrests occur in the United States, and survival rates nearly double when a bystander begins immediate cardiopulmonary resuscitation. Whether you are pursuing an ACLS algorithm certification, studying for a national CPR foundation exam, or simply want to be prepared in an emergency, mastering the correct sequence of actions is essential before help arrives.
CPR combines chest compressions with rescue breaths to manually circulate oxygenated blood to the brain and vital organs when the heart has stopped beating. The brain begins to sustain irreversible damage within four to six minutes of oxygen deprivation, which is why speed and accuracy matter enormously. Modern guidelines from the American Heart Association emphasize a compression-first approach — the CAB sequence (Compressions, Airway, Breathing) — replacing the older ABC method to minimize delays in establishing circulation for adult victims.
Before diving into the procedure itself, it helps to understand what cardiac arrest actually looks like. A victim will be unresponsive, will not be breathing normally, and may produce occasional gasping sounds called agonal breathing, which should not be confused with normal respiration. Recognizing these signs quickly allows a bystander to call 911, retrieve an AED if available, and begin cpr procedure steps without hesitation, buying critical time until professional emergency medical services arrive.
The principles covered in this guide apply across multiple life support contexts. Emergency medical technicians, nurses, and physicians rely on the same foundational sequence taught in basic life support classes, although advanced providers layer in additional interventions such as airway management devices and medication protocols drawn from the ACLS algorithm. Knowing where basic CPR ends and advanced cardiac life support begins helps you appreciate the full scope of emergency care and gives you a framework for further study if you are pursuing pals certification or a healthcare BLS credential.
This guide walks you through every phase of the CPR process — from initial scene assessment through compression technique, rescue breaths, AED use, and special population considerations like infant CPR. Along the way you will find tips for maintaining proper respiratory rate during ventilations, guidance on recovery position for breathing victims, and advice on when to stop and reassess. Real-world numbers, technique cues, and common mistakes are all covered so you finish with actionable knowledge rather than vague theory.
One common misconception worth addressing early: CPR does not restart the heart. What it does is maintain minimal but critical perfusion to the brain and heart muscle until a defibrillator can deliver an electrical shock capable of restoring normal rhythm. This is why AED availability and rapid defibrillation are so tightly linked to survival statistics — and why understanding what does AED stand for (Automated External Defibrillator) is just as important as mastering chest compressions. The two interventions work together as a chain of survival rather than as separate options.
Whether you found this page while searching for cpr cell phone repair and stumbled onto something far more valuable, or you are deliberately studying for your next certification renewal, the information ahead is organized to help you learn efficiently. Each section builds on the last, giving you a complete mental model of the resuscitation process from the moment you recognize an emergency to the moment professional responders take over. Let us start at the very beginning — recognizing that someone needs help.
Before touching the victim, scan the environment for hazards — traffic, downed power lines, fire, or violent bystanders. Your safety must come first. A second victim does not help anyone. Take two to three seconds for a rapid visual sweep, then approach only when the scene is safe.
Tap the victim's shoulders firmly and shout, 'Are you okay?' If there is no response, immediately call 911 or instruct a specific bystander — point and say 'You, call 911 now.' Directing someone specifically prevents the bystander effect. If alone, call first for adults; for children, give two minutes of CPR before calling.
Look for normal breathing while simultaneously checking the carotid pulse (adults) or brachial pulse (infants) for no more than ten seconds. Agonal gasping is not normal breathing. If absent or uncertain, begin CPR immediately. Trained healthcare providers check both; lay rescuers should simply look for absent normal breathing.
Place the heel of one hand on the center of the chest (lower half of the sternum), interlock the other hand on top, keep arms straight, and compress at least 2 inches deep at a rate of 100–120 beats per minute. Allow full chest recoil between compressions. Minimize interruptions to less than 10 seconds.
Tilt the head back and lift the chin to open the airway. Pinch the nose, create a seal over the mouth, and deliver two breaths each lasting about one second — enough to see the chest rise. If the first breath does not go in, reposition the head and try again before giving the second breath.
Turn on the AED, attach pads to bare dry skin as shown in the diagram, and follow voice prompts. Clear the victim before analysis and shock delivery. Resume CPR immediately after each shock — do not wait to reassess the pulse. The AED will reanalyze every two minutes and guide your next steps automatically.
Chest compression quality is arguably the single most important variable in CPR survival outcomes, and every element of technique contributes to how effectively blood is pushed through the circulatory system. The heel of your dominant hand should be positioned on the lower half of the sternum — roughly at the center of the chest between the nipples for adult victims.
Placing your hands too high can fracture the xiphoid process, while placing them too low risks compressing abdominal organs and producing ineffective flow. Interlocking the fingers of both hands keeps compression force directed through the heel and reduces the chance of rib fractures.
Arm position matters as much as hand placement. Your elbows must remain locked and your shoulders should be positioned directly above your hands so that downward body weight, not arm muscle strength, drives each compression. Using body weight is far more sustainable over multiple cycles and produces more consistent depth. If your arms begin to fatigue quickly, it is almost always because you are bent at the elbows or positioned too far to the side. Adjust your stance so your knees are beside the victim's chest and lean directly overhead before resuming.
Compression depth for adults is a minimum of two inches (five centimeters) and ideally no more than 2.4 inches (six centimeters). Going shallower than two inches produces inadequate cardiac output; going deeper than 2.4 inches increases the risk of complications without meaningful benefit.
Many bystanders underestimate how hard they need to push — studies consistently show that untrained and even trained rescuers deliver compressions that are too shallow. If you feel slight resistance followed by a solid stopping point, you are in the right range. Rib cracking, while alarming, is not a reason to stop CPR in an adult; effective compression and circulation take priority.
The rate of 100 to 120 compressions per minute sounds straightforward, but maintaining it without a metronome or feedback device is surprisingly difficult under stress. A useful memory trick is to compress to the beat of the song "Stayin' Alive" by the Bee Gees, which clocks in at approximately 103 beats per minute. Alternatively, many AED devices and CPR feedback apps provide real-time audio cues. Emergency dispatchers trained in telephone CPR can also count out a rhythm for bystanders, which is one more reason calling 911 early and keeping the line open adds measurable value.
Full chest recoil between compressions is a requirement that is easy to neglect when you are tired or anxious. Leaning on the chest between compressions — a habit called "chest leaning" — prevents the heart chambers from refilling with blood, which dramatically reduces cardiac output even if compression depth and rate are perfect. After each downstroke, consciously lift your weight to allow the sternum to return to its natural position before the next compression. High-quality CPR requires active attention to both the push and the release phase equally.
Minimizing interruptions to chest compressions is critical. The AHA recommends keeping any pause in compressions to less than ten seconds. This applies to pulse checks, airway maneuvers, and AED rhythm analysis. Every second without compressions allows coronary perfusion pressure — the pressure that pushes blood through the coronary arteries — to decay rapidly. It takes several compressions after a pause to rebuild that pressure. Even a brief, well-intentioned interruption, such as repositioning or stopping to communicate, reduces overall effectiveness. If you are working with a partner, practice a seamless handoff so that the transition takes fewer than five seconds.
Rescuer fatigue is a real limitation that affects compression quality, often before the rescuer is aware of it. Studies show that quality degrades significantly after just two minutes, even in trained individuals. The AHA recommends that two-rescuer teams switch the compressor role every two minutes, ideally timed to AED analysis cycles so compressions are not interrupted for the switch. If you are alone, maintain the best compression quality you can and focus on the basics: depth, rate, and full recoil. When emergency services arrive, communicate what you have done and step aside for the handoff smoothly.
Properly opening the airway before delivering rescue breaths dramatically increases the chance that air will actually enter the lungs. The head-tilt chin-lift maneuver is the standard technique for unresponsive victims with no suspected spinal injury. Place one hand on the forehead, place two fingers of the other hand under the bony part of the chin, then simultaneously tilt the head backward and lift the chin upward. This movement extends the neck and lifts the tongue off the back of the throat, which is the most common airway obstruction in unconscious patients. For victims with suspected cervical spine trauma — such as those involved in diving accidents or high-speed collisions — trained rescuers should instead use the jaw-thrust maneuver, which opens the airway without extending the neck.
When delivering rescue breaths, create an airtight seal over the victim's mouth, pinch the nose firmly shut, and deliver each breath over approximately one second — just enough to see visible chest rise. Overinflating the lungs by blowing too hard or too long causes gastric inflation, where air enters the stomach rather than the lungs. Gastric inflation increases the risk of regurgitation and aspiration, which can complicate resuscitation significantly. The proper respiratory rate during CPR ventilation is two breaths per thirty compressions for single-rescuer adult CPR, producing roughly ten to twelve ventilations per minute during two-rescuer CPR once an advanced airway is placed.
So what does AED stand for? An Automated External Defibrillator is a portable electronic device that analyzes cardiac rhythm and delivers a controlled electrical shock to restore normal heart function. AEDs are designed for use by lay rescuers with minimal training — voice and visual prompts guide every step. When an AED arrives on scene, power it on immediately, then expose the victim's bare chest. Dry the skin if wet, and shave thick chest hair if a razor is available, because good pad-to-skin contact is essential for accurate rhythm analysis and effective shock delivery. Attach the pads exactly as shown on the diagram printed on each pad — one below the right collarbone, one on the left side below the armpit.
Once pads are attached, the AED will analyze the heart rhythm automatically and will tell you to stand clear if a shock is advised. Before pressing the shock button, visually confirm that no one is touching the victim and loudly announce "Clear!" After the shock, immediately resume chest compressions without waiting to check a pulse — the AED will reanalyze every two minutes. Not all rhythms are shockable: asystole (flatline) and pulseless electrical activity (PEA) do not respond to defibrillation, and in those cases the AED will instruct you to continue CPR. Keep the AED on and pads attached throughout the entire resuscitation effort.
The recovery position — also called lateral recumbent or position recovery — is used for victims who are breathing on their own but remain unconscious or unresponsive. It keeps the airway open and allows fluid, vomit, or blood to drain from the mouth rather than back into the airway, which prevents aspiration. To place someone in the recovery position, kneel beside the victim, extend the arm nearest to you at a right angle to the body with the elbow bent and palm facing upward. Bring the far arm across the chest and hold the back of the hand against the victim's near cheek. Then pull up the far knee and use it as a lever to gently roll the victim toward you until they rest on their side, supported by the bent knee.
The recovery position is not appropriate for cardiac arrest victims, who need CPR and defibrillation rather than positional airway management. Reserve it for cases where the victim has a pulse, is breathing adequately, but cannot protect their own airway consciously. Monitor a victim placed in the recovery position continuously, check breathing every minute, and be ready to start CPR immediately if they stop breathing or lose their pulse. If a spinal injury is suspected, avoid rolling the victim without cervical spine immobilization support from a second trained rescuer. Emergency services should always be called even when a victim recovers spontaneous breathing, because the underlying cause still requires evaluation.
The single most common mistake in bystander CPR is compressing too shallowly. Research shows that effective compressions — at least 2 inches deep at 100–120 per minute with full chest recoil — can triple survival rates compared to poor-quality compressions. If you are not sure whether you are pushing hard enough, push harder. Rib discomfort or minor injury is acceptable; inadequate circulation is not.
Infant CPR and pediatric resuscitation follow the same general principles as adult CPR but require important technique modifications that reflect the physiological differences between infants, children, and adults. For infants under one year of age, cardiac arrest is far more often caused by respiratory failure than by a primary cardiac event, which means ventilation carries extra weight in the infant resuscitation sequence. The American Heart Association recommends the CAB sequence for infants as well, but emphasizes that rescue breaths should not be omitted or deprioritized when responding to infant cardiac arrest.
Compression technique for infants uses two fingers placed on the center of the chest just below the nipple line — never the full hand. The compression depth for infants is approximately 1.5 inches (4 centimeters), which is roughly one-third of the infant's chest diameter. For two-rescuer infant CPR, the two thumb-encircling hands technique is preferred because it generates higher peak aortic pressure and better coronary perfusion pressure than the two-finger method. If you are alone with an infant in cardiac arrest, use two fingers to allow your other hand to support the infant's head and maintain airway position simultaneously.
The compression-to-ventilation ratio for infants and children changes depending on how many rescuers are present. Single rescuers use the same 30:2 ratio as for adults — thirty compressions followed by two breaths. When two trained rescuers are present for infant or child CPR, the ratio changes to 15:2, providing more frequent ventilations to account for the respiratory cause of arrest that is common in pediatric patients. This distinction is tested frequently in PALS certification examinations, and confusing the single-rescuer and two-rescuer ratios is a common source of errors during both exams and real emergencies.
Children between one year and puberty occupy a middle ground in technique. Compression depth should be about two inches (5 centimeters), and rescuers can use either one hand or the heel of one hand depending on the child's size. The rate remains 100 to 120 compressions per minute regardless of age.
For children, the airway is more anterior and the tongue proportionally larger, so the head-tilt chin-lift angle should be less extreme than for adults — a neutral or slightly extended position is sufficient to open the airway without risk of collapsing the trachea, which is more compliant in younger children.
Drowning victims of any age require special consideration. Because drowning causes death through asphyxia, these victims are profoundly hypoxic by the time cardiac arrest occurs, and the oxygen reservoir in the blood and tissues has been depleted. For drowning victims, the AHA recommends beginning with five rescue breaths before starting compressions, reversing the usual CAB sequence.
This modification reflects the respiratory rather than cardiac origin of the arrest and provides immediate oxygenation before compressions begin. AEDs are still indicated for drowning victims if they remain in cardiac arrest, but the electrical shock will not address hypoxia — ventilation must accompany defibrillation.
ACLS algorithm protocols for in-hospital cardiac arrest build on the same foundational steps but add interventions available only to trained providers: endotracheal intubation for definitive airway management, intravenous epinephrine given every three to five minutes, antiarrhythmic medications like amiodarone for refractory shockable rhythms, and the systematic search for reversible causes using the H's and T's framework (Hypovolemia, Hypoxia, Hydrogen ion excess, Hypo/Hyperkalemia, Hypothermia; Tension pneumothorax, Tamponade, Toxins, Thrombosis pulmonary, Thrombosis coronary). PALS certification similarly trains pediatric providers to identify and treat reversible causes in children systematically.
Pregnancy introduces another layer of complexity. In a pregnant victim beyond 20 weeks gestation, the gravid uterus compresses the inferior vena cava when the patient is supine, reducing venous return to the heart and impairing CPR effectiveness. Standard guidance calls for manual left uterine displacement — a second rescuer pushes the uterus leftward while compressions continue — rather than tilting the entire patient. If resuscitation is unsuccessful after four minutes, perimortem cesarean delivery may be indicated in a hospital setting to both save the fetus and improve maternal resuscitation outcomes by decompressing the inferior vena cava.
Formal CPR training is available through several nationally recognized organizations, each offering programs that range from brief awareness courses to full provider certifications. The American Heart Association (AHA) offers Heartsaver CPR AED for laypersons, Basic Life Support (BLS) for Healthcare Providers, and advanced programs including ACLS and PALS. The American Red Cross provides similar tiered offerings, and the National CPR Foundation delivers online and blended-learning options that are accepted by many employers. Choosing the right course depends on your professional role, your employer's requirements, and whether you need a card that satisfies clinical credentialing standards.
Healthcare professionals — nurses, paramedics, respiratory therapists, physicians — are typically required to hold a current BLS for Healthcare Providers card and, depending on their unit, ACLS or PALS certification as well. These certifications expire every two years and must be renewed through an instructor-led skills check or an approved blended-learning program that combines online study with an in-person skills session. Simply watching a video or completing online modules without a hands-on component does not satisfy the requirement for most healthcare employers, and the distinction matters during credentialing reviews.
Lay rescuers and community members can complete a Heartsaver or basic CPR course in as little as two to four hours. These courses cover adult, child, and infant CPR, AED use, and basic first aid depending on the module. Many employers in high-risk environments — schools, fitness centers, construction sites — require that a minimum percentage of staff maintain current CPR certification. Checking whether your workplace has a formal emergency response plan and what certifications it requires is a practical first step in deciding which course to pursue.
Online-only CPR certification programs have grown in popularity, particularly after the COVID-19 pandemic accelerated the development of virtual learning options. However, it is important to distinguish between awareness programs and certification programs. A true CPR certification requires a demonstrated skills component — meaning you must physically perform compressions and rescue breaths on a mannequin in front of an instructor. Certificates issued without a hands-on component may satisfy general awareness requirements but will not meet clinical or most employer standards. Verify acceptance requirements with your employer before enrolling in any online-only program.
Certification renewal intervals exist for good reason. CPR skills decay faster than most people expect; studies show that technique accuracy drops significantly within three to six months of initial training without practice. Two-year renewal cycles are a compromise between administrative burden and skill retention. Many instructors recommend informal practice with mannequins or CPR feedback apps between formal renewals to maintain muscle memory, especially for healthcare providers who may not perform CPR frequently in their daily practice despite being certified.
The cost of CPR certification varies by program and provider. Community CPR classes through local fire departments or community centers are often free or low-cost. Employer-sponsored training programs pass the cost to the organization. AHA and Red Cross courses taken through independent training centers typically run between $50 and $100 for a layperson Heartsaver card and $100 to $150 or more for a healthcare BLS card with skills check. ACLS and PALS recertification courses are longer and correspondingly more expensive, often $200 to $350, though employers in clinical settings commonly subsidize or fully cover the cost as a staffing requirement.
Understanding the full landscape of CPR training — from awareness to advanced provider level — helps you make an informed choice about where to invest your time and money. For most people, a basic Heartsaver or BLS course is sufficient and genuinely valuable. For healthcare professionals, keeping ACLS and PALS credentials current is both a professional obligation and a direct patient safety measure. Whichever level you pursue, the foundational cpr procedure steps you learn in any legitimate course will stay with you and could save a life in the moments that count most.
Preparing effectively for a CPR certification exam or recertification requires more than reading about technique — it demands hands-on practice combined with conceptual understanding of the why behind each step. As you study, focus on memorizing the critical numbers: 100 to 120 compressions per minute, at least 2 inches of depth for adults, 1.5 inches for infants, 30:2 compression-to-ventilation ratio for single rescuers, 15:2 for two-rescuer pediatric CPR, pulse and breathing check limited to ten seconds, and AED analysis every two minutes. These numbers appear repeatedly on certification exams and in dispatcher-assisted protocols, so fluency with them is non-negotiable.
Practice scenarios are an extremely effective study tool. Ask a study partner to call out a scenario — "You find an unresponsive adult in a parking lot" — and walk through the entire sequence aloud, naming each action before you perform it. This technique, known as cognitive rehearsal, builds the neural pathways for automatic action under stress.
Many AHA instructors use scenario-based practice in skills sessions precisely because cardiac arrest response needs to feel automatic, not deliberated. The more you rehearse the sequence in low-stakes practice, the more reliably you will execute it when adrenaline is flooding your system in a real emergency.
Common exam pitfalls include confusing adult and pediatric compression depths, misidentifying agonal breathing as normal breathing, forgetting to check for scene safety before approaching, and getting the single-rescuer versus two-rescuer compression ratios mixed up for children versus adults. Another frequent mistake is stating that CPR restarts the heart — an inaccurate statement that many test-takers assume is true. CPR maintains circulation; defibrillation restores rhythm. If your exam asks whether you should check for a pulse after every AED shock, the correct answer is no — resume compressions immediately and let the AED reanalyze at the next two-minute mark.
For those pursuing the ACLS algorithm, the study load is substantially heavier. ACLS requires mastery of cardiac rhythms — being able to identify ventricular fibrillation, pulseless ventricular tachycardia, asystole, and PEA on a cardiac monitor. You must also know which rhythms are shockable, the correct energy levels for defibrillation, the timing and dosing of epinephrine, and when to consider antiarrhythmic therapy.
The H's and T's of reversible causes must be memorized and applied in scenario-based testing. Most ACLS courses recommend that candidates review basic arrhythmia recognition and BLS skills before the course rather than trying to learn everything simultaneously in the classroom.
PALS certification is the pediatric analog to ACLS and tests knowledge of pediatric respiratory emergencies, shock recognition, and cardiac arrest management in children. PALS candidates are expected to recognize early signs of respiratory distress and compensated shock — conditions that precede pediatric cardiac arrest — and intervene before arrest occurs. The weight-based dosing of medications in children is a key component, as is the ability to select appropriately sized equipment such as bag-mask devices, endotracheal tubes, and defibrillation energy levels scaled to body weight (2 joules per kilogram for first pediatric shock, 4 joules per kilogram for subsequent shocks).
Free practice tests are one of the most efficient and accessible preparation tools available. Quality practice questions expose you to exam-style phrasing, identify gaps in your knowledge, and help you build familiarity with the decision-making scenarios that certification exams favor. Unlike passive reading, answering a question forces active recall, which has been shown in cognitive science research to produce stronger long-term retention than re-reading the same material. Plan to answer several hundred practice questions distributed over multiple study sessions rather than cramming all at once in the days immediately before your exam.
Finally, do not underestimate the value of the practical skills session in your course. Every certification course that meets AHA or Red Cross standards includes hands-on mannequin practice evaluated by a qualified instructor. Use that time intentionally: ask for feedback on your compression depth and rate, practice the head-tilt chin-lift until it feels natural, and walk through the AED sequence at least twice so the steps are automatic.
If your first attempt at the skills check reveals weaknesses, view it as useful data rather than failure — the whole point of practice is to identify and correct errors before they occur in a real emergency where there is no second chance.