The Thai Anesthesia Incident Monitoring study (Thai AIMS): perioperative arrhythmia.

Background: The Royal College of Anesthesiologists of Thailand organized the first national sentinel incident reports of anesthesia related adverse events in 2007 on an anonymous and voluntary basis. The aims of the present study were to analyze incidence, risk factors, clinical course and outcome of perioperative arrhythmia and indicate the contributing factors and suggested corrective strategies in the database of the Thai Anesthesia Incidents Monitoring Study (Thai AIMS).

Material And Method: This study was a prospective descriptive multicentered study conducted between January 2007 and June 2007. Data was collected from 51 hospitals across Thailand. All cases whose arrhythmia was detected intra-operatively and within 24 hr postoperative period were analyzed by 3 independents anesthesiologists. Any disagreements were discussed to achieve a consensus.

Results: Four hundred and eighty-nine cases were enrolled as relevant arrhythmia cases. Bradycardia was the most common type (434 cases; 88.8%). Most of all events occurred intra-operatively (94.7%) and electrocardiography was the most common firstly detected monitoring equipment (95.5%). Arrhythmia occurred frequently in patients with hypertension and pre-operative heart rate < 60 beat per min. Intravenous anesthetics, central neural blockage and vagal reflex were considered to be the 3 most common suspected causes of arrhythmia requiring treatment. Most common outcomes were minor physiologic change with complete recovery physiologic change with complete recovery while 7% of incidents developed fatal outcome. The most common contributing factor was human factor (72.4%) especially in experience. An experienced anesthetic team with high awareness could be the minimizing factors.

Conclusion: Arrhythmia accounted for 19.2% of 2,537 incidents of the Thai AIMS database. Bradycardia was the most common type of cardiac arrhythmia. Most arrhythmia was benign but might be fatal. Suggested corrective strategies such as guidelines practice, improvement of supervision and quality assurance activity.