The goal of this observational study is to evaluate the perioperative risk of malignant ventricular arrhythmias in adult patients diagnosed with Brugada Syndrome undergoing anaesthetic procedures. Brugada Syndrome is a rare inherited cardiac condition associated with an increased risk of life-threatening arrhythmias, and perioperative management remains challenging due to limited high-quality evidence.

The main questions it aims to answer are:

• What is the incidence of malignant ventricular arrhythmias during anaesthesia and up to 30 days after the procedure?
• Are anaesthetic drugs traditionally considered "non-recommended" associated with an increased risk of perioperative arrhythmic events?

Researchers will also explore the relative contribution of anaesthetic drugs versus perioperative physiological factors (e.g., haemodynamic changes, fever, bradycardia) in triggering arrhythmias.

Participants will:

• Undergo anaesthetic procedures (general, locoregional, or sedation) as part of routine clinical care
• Have clinical data collected prospectively from electronic medical records during the perioperative period
• Be followed for 30 days after the procedure to assess outcomes, including arrhythmias, complications, ICU admission, and mortality

This is a multicentre, prospective observational registry, and no additional interventions or changes to standard clinical practice will be performed.

Patients should match all the inclusion criteria to be entered for data collection:

• Documented type 1 Brugada ECG pattern (spontaneous, fever-related, or induced by sodium-channel blocker challenge/other recognised provocation test) with a diagnosis considered compatible with Brugada syndrome by the treating cardiology team.
• Undergoing general anaesthesia, monitored sedation, loco-regional anaesthesia for any surgical, diagnostic, interventional, obstetric or other non-surgical procedure (including epidural analgesia for labour and sedation for endoscopy).

Patients with one or more exclusion criteria will not be included for data collection and analysis:

• No documented type 1 Brugada ECG pattern, uncertain diagnosis without sufficient supporting data.
• Refusal to participate in the study.

The study population will consist of adult patients with a confirmed diagnosis of Brugada Syndrome receiving care at participating tertiary and secondary hospitals. Patients will be identified through preoperative anaesthesia assessments, hospital admissions, and operating room schedules. The registry will include consecutive patients undergoing any type of anaesthetic procedure (general, locoregional, or sedation) for surgical or non-surgical interventions as part of routine clinical care. Participating centres are expected to include institutions with experience in the perioperative management of cardiac patients, ensuring representation of real-world clinical practice across different healthcare settings.