It still amazes me that people avoid contact with their clients about seemly simply things. Yesterday I got a new client because his previous transcriptionist had gone on leave and not bothered to inform him that she would be unavailable to do work for him. How did he find out? His office manager found out when she rang the transcriptionist on Thursday evening to find out where the work was. Hence him ringing me at 7:30 in the morning.
While I am not going to get into who should look for the replacement to cover work while you're on leave as I believe that's a personal choice issue, I do however believe that you should advise your clients either way if you are going to be unable to do their work for a period of time.
While a week may not seem long to you in the life and work of a doctor that can be a long time. Whatever the reason you are unable to do the work common courtesy should prevail. If you were an employee you would ask for leave from your boss, but as a self-employed profressional you should advise your clients that you will be unavailable to do their work and the dates you will be unavailable. If you are arranging the cover then also let your client have at least minimal contact details for the person providing cover for you in case they need to get hold of them urgently.
To my new client's previous transcriptionist, I hope you had a great break and good luck with finding new work to replace what you've lost.