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PubMed This is a summary of 26 peer-reviewed journal articles Updated
Cardiology

What Do Brugada ECG Type 1 and Type 2 Mean?

At a Glance

Only a Type 1 "coved" ECG pattern confirms a Brugada syndrome diagnosis. A Type 2 "saddleback" pattern is suspicious but requires a medication challenge test to confirm. Whether your pattern appears naturally or during a test helps determine your overall risk level.

In this answer

4 sections

01

Understanding the Visual Differences

02

Moving from Suspicion to Diagnosis

03

What the Types Mean for Your Risk Level

04

Managing Triggers: Fever and Medications

If you are reading your clinical notes and see mentions of different “Types” of Brugada electrocardiograms (ECGs), the most important thing to know is that only a Type 1 pattern definitively confirms a Brugada syndrome diagnosis [1][2]. The “Types” refer to the specific visual shape of your heart’s electrical waves on paper. A Type 1 pattern has a distinct “coved” (curved downwards) shape, while other types look more like a “saddleback.” Seeing a Type 2 or Type 3 pattern does not mean you have Brugada syndrome; instead, it usually acts as a flag for your doctor to run a special medication test to see if a Type 1 pattern is hiding [3][4].

Understanding the Visual Differences

When doctors look at an ECG (a test that measures your heart’s electrical activity), they examine specific parts of the electrical wave to check for Brugada syndrome. Importantly, these patterns are dynamic, meaning they can fluctuate or even temporarily disappear from day to day [5][6][7]. This is why your doctor may want multiple ECGs over time.

  • Type 1 (The “Coved” Pattern): This is the classic Brugada pattern. The electrical wave curves upward prominently (at least 2 millimeters) and then slopes downward, resembling a ski slope or a “coved” arch [8][1]. Only a spontaneous or drug-induced Type 1 pattern is considered diagnostic of Brugada syndrome [9][10].
  • Type 2 (The “Saddleback” Pattern): The wave rises, dips down slightly, and then rises again, looking like the saddle on a horse [2]. It is considered a suspicious, but non-diagnostic, finding.
  • A Note on “Type 3”: You may see “Type 3” in older medical notes to describe a very mild saddleback pattern. However, international medical guidelines updated in 2013 formally merged Type 2 and Type 3 into a single “Type 2” category [11][2].

To get a better look at these waves, doctors frequently use high-lead ECGs. This means they move the ECG stickers slightly higher up on your chest (to the 2nd or 3rd intercostal spaces) to increase the chances of capturing the pattern [12][13].

Moving from Suspicion to Diagnosis

Because a Type 2 pattern is non-diagnostic, seeing it on an ECG usually prompts your care team to investigate further. To find out if your heart actually has a Type 1 pattern, doctors perform a provocation test (sometimes called a drug challenge).

During this test, you are given a specific medication—often a sodium channel blocker like ajmaline or flecainide—while your heart is continuously monitored [9][14].

  • If the pattern changes to a Type 1: The test is positive, and it confirms the diagnosis of Brugada syndrome [1].
  • If the pattern stays the same: The test is negative. However, a negative test does not completely rule out Brugada syndrome, especially if you have a family history of the condition or have experienced unexplained fainting [15][16].

Because these medications can occasionally trigger abnormal heart rhythms, provocation testing is carefully controlled and must be performed in specialized medical centers with strong safety protocols [13][17].

What the Types Mean for Your Risk Level

The presence and timing of a Type 1 ECG play a role in how doctors assess your risk for experiencing abnormal heartbeats.

  • Spontaneous Type 1: If your Type 1 pattern shows up naturally on a routine ECG without the use of medication, research suggests this is linked to a higher risk of future cardiac events compared to a drug-induced pattern [18][19]. If you have a spontaneous Type 1 pattern and a history of unexplained fainting or cardiac arrest, your doctor will likely recommend robust safety measures, such as an Implantable Cardioverter Defibrillator (ICD), which monitors your heart and delivers a shock if a dangerous rhythm occurs [20][21][22].
  • Drug-Induced Type 1: If a Type 1 pattern only appears during a provocation test, the associated risk level is generally considered to be lower than if it appeared spontaneously, though risk assessment is highly individualized based on your personal and family history [23][19].

Managing Triggers: Fever and Medications

Certain physical stressors can temporarily trigger a Type 1 pattern in people with Brugada syndrome.

A high fever is a well-known trigger that can unmask a Type 1 pattern or increase the risk of an abnormal heart rhythm [24][7]. If you have a suspected or confirmed Brugada diagnosis, you should aggressively treat any fever with fever-reducing medications (such as acetaminophen/paracetamol) to keep your temperature down, and seek medical attention if the fever does not respond [24][25].

Additionally, certain common medications can trigger the ECG pattern. Always consult your cardiologist about which over-the-counter and prescription medications are safe for you to take, as maintaining a strict “safe drug” list is a cornerstone of living safely with Brugada syndrome [25][26].

Common questions in this guide

What is the difference between a Type 1 and Type 2 Brugada ECG?
A Type 1 Brugada ECG has a distinct 'coved' or downward curved pattern and is the only type that confirms a diagnosis. A Type 2 ECG has a 'saddleback' shape and is considered suspicious, but it requires further testing to see if Brugada syndrome is actually present.
What is a Brugada provocation test?
A provocation test, also called a drug challenge, involves receiving a specific medication like ajmaline while your heart is continuously monitored. Doctors use this test to see if a suspicious Type 2 ECG pattern will change into a diagnostic Type 1 pattern.
Is a spontaneous Brugada ECG pattern more dangerous than a drug-induced one?
Yes, research indicates that a Type 1 pattern that appears naturally on a routine ECG carries a higher risk of future cardiac events. A pattern that only appears during a medication test is generally associated with a lower risk, though your doctor will evaluate your specific situation.
Why is a fever dangerous if I have Brugada syndrome?
A high fever can trigger or unmask a Type 1 ECG pattern, which increases your risk of experiencing a dangerous abnormal heart rhythm. It is critical to aggressively treat any fever with medications like acetaminophen and seek emergency care if your temperature does not go down.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Was my Brugada ECG pattern observed spontaneously, or only after provocation with a medication?
  2. 2.Should we perform a 'high-lead' ECG at my next visit to get a clearer picture of my pattern?
  3. 3.What is my specific action plan if I develop a fever, and at what temperature should I go to the emergency room?
  4. 4.Can you provide me with a list of medications I need to avoid, and where can I check if a new prescription is safe for my heart?
  5. 5.Based on whether my pattern is spontaneous or drug-induced, do I need to be evaluated for an Implantable Cardioverter Defibrillator (ICD)?

Questions For You

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References

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This page explains Brugada syndrome ECG patterns for educational purposes only. Always consult your cardiologist or electrophysiologist to interpret your specific ECG results and determine your personal risk level.

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