Venous thromboembolism(VTE) is the third most common cardiovascular complication among hospitalized patients, and can even cause death. VTE often occurs in intensive care patients and there had been many efforts to prevent such complication. The American College of Chest Physicians (ACCP) had published evidence-based clinical practice guideline for VTE prophylaxis.

This study focuses on how VTE prophylaxis is being performed in both medical and surgical ICUs in a single University hospital, and sees the differences in such prophylactic patterns.

Inclusion Criteria:

1. 20-60 years old patients with ASA class I-II
2. Scheduled for drug induced sleep endoscope after diagnosed with sleep apnea syndrome

Exclusion Criteria:

1. Patients having hearing difficulties, taking any CNS related medication, history of any adverse drug reaction, Glasgow coma scale < 15
2. Patients with severe cardiopulmonary dysfunction
3. Patients refusal