ACLS stands for Advanced Cardiovascular Life Support, a certification course developed by the American Heart Association that trains healthcare providers to manage cardiac arrest, stroke, and other severe cardiovascular emergencies. The course covers high-quality CPR, heart rhythm recognition, defibrillation, airway management, and emergency medication use. It’s widely required for nurses, physicians, paramedics, and other clinical staff who work in acute care settings like emergency departments, ICUs, and operating rooms.
What the Course Covers
ACLS builds on basic life support (BLS) skills and adds a layer of clinical decision-making. The core goal is standardizing how teams respond to cardiac arrest so that every provider follows the same evidence-based steps, whether the emergency happens in a hospital or out in the field. The course teaches you to work through structured algorithms, essentially step-by-step decision trees, for different types of cardiac emergencies.
The specific skills you’ll practice include:
- High-quality CPR: proper compression rate, depth, and minimizing interruptions
- Rhythm recognition: identifying dangerous heart rhythms on a monitor and knowing what each one calls for
- Defibrillation and cardioversion: when and how to deliver electrical shocks to restore a normal rhythm
- Advanced airway management: techniques beyond basic rescue breathing
- Emergency medications: which drugs are used during resuscitation and when to give them
- Transcutaneous pacing: using an external device to control heart rate in certain emergencies
- Team dynamics: communication roles, closed-loop communication, and how to function as a high-performing resuscitation team
A major emphasis is placed on preventing cardiac arrest in the first place. The course teaches a systematic approach to assessing unstable patients so you can intervene before they deteriorate to the point of arrest.
Who Needs ACLS Certification
ACLS is designed for healthcare professionals who either lead or participate in resuscitation efforts. Emergency physicians, nurses working in critical care or emergency departments, anesthesiologists, paramedics, and respiratory therapists are among the most common certificate holders. Many hospitals require ACLS certification as a condition of employment for any provider working in areas where cardiac emergencies are likely, including the ER, ICU, cardiac catheterization labs, and surgical suites.
Medical and nursing students often complete the course during their training, and some outpatient clinics require it for staff as well. If your job puts you in a position where you could be the first responder to a cardiac arrest, there’s a good chance your employer expects you to hold a current ACLS card.
Prerequisites Before You Enroll
You need a working knowledge of BLS before taking ACLS. Most training centers expect you to already hold a current BLS provider certification, since ACLS builds directly on those foundational skills. Beyond CPR competency, you should be comfortable with basic ECG interpretation and have some familiarity with the medications used in emergency cardiac care.
Before the course itself begins, you’re required to complete a precourse self-assessment and score at least 70%. This covers rhythm recognition, pharmacology, and basic resuscitation concepts. It’s meant to confirm you have the baseline knowledge to get the most out of the hands-on training.
Course Format and Time Commitment
The AHA offers ACLS in two main formats. The traditional classroom version is fully instructor-led over one to two days, typically running around 15 hours of total instruction. The blended (or “HeartCode”) format lets you complete the knowledge portion online at your own pace, then attend a shorter in-person session for hands-on skills practice and testing.
The in-person component, regardless of format, is where the real learning happens. You’ll work through realistic scenarios on a manikin as part of a team, rotating through roles like team leader, compressor, and airway manager. Instructors run you through megacode cases, which are simulated full cardiac arrest scenarios that require you to apply multiple algorithms in sequence. After each scenario, there’s a structured debriefing to discuss what went well and what could improve.
How You’re Tested
Certification requires passing both a written assessment and a practical skills evaluation. The written portion tests your knowledge of algorithms, rhythm recognition, and pharmacology. The hands-on portion involves two key components: a BLS skills test (proving you can perform high-quality CPR) and a megacode test, where you lead or participate in a simulated cardiac arrest from start to finish.
During the megacode, an instructor evaluates whether you correctly identify the rhythm, follow the appropriate algorithm, delegate tasks to your team, and make the right decisions about defibrillation and medications. You need to demonstrate competence across the full range of skills, not just knowledge of isolated steps.
Certification and Renewal
Once you pass, you receive a Provider Course Completion Card that is valid for two years. After that, you’ll need to take a renewal course (sometimes called a “recertification” or “update” course) to maintain your certification. Renewal courses are shorter than the initial course, since they assume you’ve been using these skills in practice and just need to refresh your knowledge and demonstrate continued competency.
The AHA also offers an ACLS for Experienced Providers option, designed for people who regularly lead resuscitation teams and are already proficient in ACLS skills, ECG interpretation, and pharmacology. This version goes deeper into complex scenarios rather than covering basics.
Recent Guideline Changes
ACLS courses are updated whenever the AHA releases new resuscitation guidelines, which happens roughly every five years. The most recent 2025 guidelines refined the timing of epinephrine during cardiac arrest. For adults with a shockable rhythm (like ventricular fibrillation), the updated recommendation is to administer epinephrine after initial defibrillation attempts have failed, rather than giving it at a fixed interval regardless of rhythm. For pediatric patients with non-shockable rhythms, the guidance now emphasizes giving the first dose of epinephrine as early as possible, ideally within three minutes, based on evidence that earlier administration is associated with better outcomes.
If you took the course under older guidelines, your renewal course will bring you up to speed on these changes. The algorithms shift modestly with each update, so staying current matters even if the core principles remain stable.