In medical terms, CAB most commonly refers to two things: the CPR sequence of Circulation, Airway, Breathing used in emergency resuscitation, and coronary artery bypass, a major heart surgery. Which meaning applies depends entirely on the context. Here’s what each one involves and why it matters.
CAB in CPR: Circulation, Airway, Breathing
If you’ve seen CAB in the context of first aid or emergency medicine, it stands for Circulation, Airway, Breathing. This is the recommended sequence for performing CPR on someone in cardiac arrest. It replaced the older ABC (Airway, Breathing, Circulation) approach in 2010, when both the American Heart Association and European resuscitation councils updated their guidelines.
The shift was straightforward: chest compressions are the single most important part of keeping someone alive during cardiac arrest, and the old ABC sequence delayed them. Under ABC, rescuers were taught to tilt the head back, open the airway, and deliver rescue breaths before starting compressions. Those steps take time, and every second without blood flow to the brain matters. By putting circulation first, the CAB sequence gets compressions started sooner.
The reasoning also drew on growing evidence that CPR with chest compressions alone produces outcomes comparable to conventional CPR with rescue breaths, at least in the first minutes. Time-consuming steps like positioning the head and sealing a bag mask can happen in parallel with compressions or after the first cycle. The old “Look, Listen, and Feel” step was also removed from the protocol entirely because it was inconsistent and wasted precious seconds.
What Each Letter Means in Practice
- C (Circulation): Begin chest compressions immediately. For adults, compress the center of the chest at least 2 inches deep. For children, at least 1.5 inches. Push hard and fast, aiming for 100 to 120 compressions per minute.
- A (Airway): After the first round of compressions, tilt the person’s head back and lift the chin to open the airway.
- B (Breathing): Deliver rescue breaths if you’re trained to do so. If not, continuous chest compressions alone still give the person a fighting chance.
CAB in Heart Surgery: Coronary Artery Bypass
The other major medical use of CAB is as shorthand for coronary artery bypass, more formally written as CABG (coronary artery bypass grafting). Medical professionals pronounce the full acronym CABG as “cabbage.” You’ll see both CAB and CABG used in medical records and cardiology literature to refer to the same procedure.
Coronary artery bypass surgery creates a detour around a blocked or narrowed artery in the heart. A surgeon takes a healthy blood vessel from another part of your body, typically an artery from inside the chest wall (the internal mammary artery) or a vein from the lower leg (the saphenous vein). That vessel, called a graft, is connected above and below the blockage so blood can flow freely to the heart muscle again. More than one graft can be placed during a single operation, which is why you’ll hear terms like “double bypass” or “triple bypass.”
The surgery is a major procedure. A surgeon makes a long incision down the center of the chest and separates the breastbone to access the heart. The heart is temporarily stopped with medication, and a heart-lung machine takes over pumping blood and oxygen through the body while the grafts are attached. Once everything is in place, the heart is restarted and the machine is disconnected.
Why CABG Is Performed
CABG is primarily used for people with significant blockages in multiple coronary arteries. When compared to the less invasive alternative, percutaneous coronary intervention (where a small tube called a stent is placed inside the artery to hold it open), bypass surgery tends to produce better long-term outcomes for patients with multivessel disease. Studies consistently show that CABG is associated with better survival, lower rates of heart attack and stroke, and fewer repeat procedures compared to stents in these patients. For a single blockage or less severe disease, stents are often sufficient, but when several arteries are affected, bypass surgery is generally the stronger option.
What Recovery Looks Like
After bypass surgery, most people spend several days in the hospital, often including time in an intensive care unit immediately after the operation. Full recovery typically takes six to twelve weeks. During that time, you can expect gradual increases in activity, starting with short walks and building from there. Soreness along the chest incision and fatigue are normal for weeks. If a leg vein was used for the graft, swelling and discomfort in that leg are also common. Most people return to work and normal activities within two to three months, though strenuous physical activity takes longer to resume.
How to Tell Which Meaning Applies
Context makes it clear. If you’re reading about emergency response, first aid training, or CPR protocols, CAB refers to the resuscitation sequence: Circulation, Airway, Breathing. If you’re looking at cardiology records, surgical notes, or a diagnosis involving blocked heart arteries, CAB (or CABG) refers to coronary artery bypass grafting. Both are common enough in medical settings that you’re likely to encounter either one, but they describe entirely different situations: one is a protocol for keeping someone alive in the moment, the other is a planned surgical procedure to restore blood flow to the heart over the long term.