Atrial tachycardia is a type of abnormal heart rhythm that starts in the upper chambers of the heart (the atria) and pushes the heart rate above 100 beats per minute, typically landing between 150 and 200 beats per minute. Unlike the normal electrical signal that originates from a single natural pacemaker, atrial tachycardia involves signals firing from the wrong spot in the atria, or circling back on themselves in a loop, causing the heart to beat faster than it should.
How It Differs From Other Fast Heart Rhythms
Several types of arrhythmias speed up the heart, and the differences matter because they require different treatments. Atrial tachycardia specifically originates in the atrial tissue itself, not in the connection point between the upper and lower chambers (which is the case in some other common fast rhythms). It’s also distinct from atrial fibrillation, where the upper chambers quiver chaotically. In atrial tachycardia, the electrical signals are more organized but still abnormal.
There are two broad categories. Focal atrial tachycardia comes from a single irritable spot in the atrium that fires too quickly. Multifocal atrial tachycardia involves three or more different sites firing independently, and it’s often tied to an underlying medical condition like lung disease. A third pattern, called macro-reentrant atrial tachycardia, involves an electrical circuit looping around a fixed structure or scar in the atrium.
What It Feels Like
Some people with atrial tachycardia feel nothing at all. Others notice a sudden pounding or fluttering sensation in the chest. The most commonly reported symptoms are palpitations, lightheadedness, chest pressure, shortness of breath, and dizziness. Some people feel like they might faint, a sensation called pre-syncope. Because these episodes can come on suddenly and without warning, they often trigger anxiety, which can make the symptoms feel even worse.
When atrial tachycardia persists for weeks or months without treatment, it can start to weaken the heart muscle. This is called tachycardia-induced cardiomyopathy, and an estimated 8 to 28% of people with focal atrial tachycardia develop it. At that stage, symptoms shift toward exercise intolerance, swelling in the legs, and worsening shortness of breath. The good news is that this type of heart muscle weakening is often reversible once the fast rhythm is controlled.
Common Causes and Triggers
Atrial tachycardia can appear in otherwise healthy people with no obvious underlying condition. But several situations make it more likely. Chronic lung diseases like COPD and interstitial lung disease are common culprits, particularly during flare-ups when oxygen levels drop. Low oxygen, high carbon dioxide levels, electrolyte imbalances, infections, and acid-base disturbances in the blood can all irritate the atrial tissue and set off abnormal rhythms.
Other triggers include volume overload (when the body retains too much fluid), anemia, pulmonary embolism, and heart attacks. Prior heart surgery can also leave scar tissue in the atria that creates the conditions for reentrant circuits. In multifocal atrial tachycardia, there’s almost always an identifiable underlying condition driving it, which is why treating the root cause is the first priority.
How It’s Diagnosed
An electrocardiogram (ECG) is the primary tool. During an episode, the ECG shows a heart rate above 100 with distinct electrical waves between each heartbeat that look different from normal. These waves reflect where in the atrium the abnormal signal is coming from. Doctors can often tell whether the problem originates in the right or left atrium based on the shape and direction of these waves across different ECG leads.
If episodes come and go, a standard ECG taken during a calm moment might look completely normal. In that case, you may be asked to wear a portable heart monitor for days or weeks to catch an episode as it happens. Once the rhythm is captured, doctors can classify the type and plan treatment accordingly.
Treatment for Focal Atrial Tachycardia
For occasional, well-tolerated episodes, treatment may not be necessary at all. When symptoms are frequent or bothersome, the options fall into two categories: medication and catheter ablation.
Beta-blockers are the most common medication used. They slow the heart rate by dampening the effect of adrenaline on the heart. Calcium channel blockers work similarly and are sometimes used as an alternative. Current guidelines no longer recommend several older medications, including procainamide, sotalol, digoxin, and amiodarone, for managing focal atrial tachycardia due to limited effectiveness or side effects.
Catheter ablation is the more definitive option and is recommended for people with recurrent episodes, particularly if the tachycardia is persistent or has started to weaken the heart. During the procedure, a thin tube is threaded through a blood vessel to the heart, and the small area of tissue causing the abnormal signal is destroyed using heat or cold energy. Success rates are high: in a large study of 780 procedures, 96.3% successfully terminated the tachycardia during the procedure. Complications occurred in about 7.5% of cases, most of which were minor. Guidelines now suggest that ablation should be offered as a first-line choice for many patients, with a thorough discussion of risks and benefits.
Treatment for Multifocal Atrial Tachycardia
Multifocal atrial tachycardia requires a different approach because the problem involves multiple abnormal sites rather than one targetable spot. The first step is always treating the underlying condition, whether that’s a lung disease flare-up, an infection, or an electrolyte imbalance. In many cases, correcting the trigger resolves the rhythm on its own.
When the arrhythmia persists despite treating the underlying cause, calcium channel blockers or selective beta-blockers are the next step. Research suggests that certain beta-blockers may be more effective than calcium channel blockers for this specific type. For people whose heart function has already declined due to ongoing multifocal atrial tachycardia that doesn’t respond to drugs, a more aggressive approach involving ablation of the electrical relay station between the upper and lower chambers, combined with a pacemaker, may be considered.
Long-Term Outlook
For most people, atrial tachycardia is manageable and not life-threatening. Focal atrial tachycardia, especially when treated with ablation, has an excellent prognosis. Even when the fast rhythm has weakened the heart, the damage typically reverses once normal rhythm is restored. The key factor in long-term outcomes is whether the arrhythmia is identified and treated before it causes sustained heart muscle damage. People with multifocal atrial tachycardia tend to have a prognosis that’s shaped more by their underlying condition than by the rhythm itself.