Endpoint
The primary outcome was the presence of adverse sedative effects that required cessation of the anesthetic drug: oxygen desaturation (< 90%) or need for assisted ventilation/intubation, bradycardia (heart rate < 45 bpm) and hypotension (systolic blood pressure < 90 mmHg) requiring fluid administration. Secondary endpoints were procedural success and procedural and fluoroscopy time. The presence of any other complication was also recorded.