I had one last week and had a cough due to an asthma flare up. My GP gave me steroids to try and settle the cough, as he said they wouldn't do it with a cough! I certainly wasn't strapped down and I had no sedation, as it was too risky for me. Mine lasted 90 mins and I spent the whole time, trying not to cough. I had to phone the day unit first for advice, because of the cough, so may be advisable to check with them first. Good luck for your husband's procedure.