Actually, between my regular doctor and the cardiologist I had a Holter monitor for 24 hours as well. But (aside from the odd contraption itsel) there wasn’t much amusing about it. The nurse didn’t seem amused by my question but, honestly, I thought the transducer was a muscle, like the trapesius or something! Also, for the record, to say that taking a deep breath, holding it, and then having her jam that tranducer-wand-of-torture into my sternum was unpleasant would be quite an understatement. I was glad to know my heart was in good shape but really!