**4.7 Brugada algorithm**

Brugada algorithm is the most widely known and commonly used algorithm (**Figure 6**) [50–64].

Brugada algorithm is as follows:

1.Is there concordance present in the precordial leads (leads V1-V6)?

"Are all of the QRS complexes completely upright, or downward in the precordial leads?"

**Figure 6.** *Brugada algorithm.* *Electrocardiographic Differential Diagnosis of Narrow QRS and Wide QRS Complex… DOI: http://dx.doi.org/10.5772/intechopen.102568*


**Table 4.**

*Morphology criteria for VT in leads V1, V2 and V6.*

If the answer is yes, then VT is the diagnosis

2.Is the R to S interval (between the onset of the R wave and the nadir of the S wave) > 100 ms in any one precordial lead?

If the answer is present, then VT is the diagnosis

3.Is AV dissociation present?

"AV dissociation occurs when P waves are seen at different rates than the QRS complexes."

If the answer is present, then VT is the diagnosis

4.Examine the morphology of the QRS complex to see if it meets the specific criteria for VT, as **Table 4**.
