We have the case of a 45-year-old man, without inherited pathological history. He is married. He has two teenage children, lives in his own house and does not live with animals. He works as a public official and is not used to doing any exercise; he has three meals a day, smokes five cigars a day and performs social alcoholism; enters the emergency department due to dizziness, muscle weakness and abdominal pain located in the right iliac fossa.

When admitted, the record of vital signs showed:

• Heart rate: 75 beats/minute
• Respirations rate: 18 breaths/minute
• Blood Pressure: 100/60 mm/Hg
• Temperature: 35.9 °C

To begin with the diagnostic conclusion, a 12-lead ECG is requested.