We use fentanyl 2mcg/kg over 3 minutes, followed by a flush for three minutes. We also give atropine and vecuronium. Prior to the vecuronium, if patient does not appear adequately sedated/comfortable, we have the option to give a second fentanyl dose. We only use the second dose about 20% of the time. No chest wall rigidity so far (have been using this regimen for almost 2 years).