I'm not in this ddc but I can reassure you. one high reading doesn't mean any more than one low reading. the baby could have been very active or stressed at that moment. My dd has been on heartrate monitors several times (after a car accident during pregnancy, during birth, for 5 days in the NICU after birth and two weeks after that at home, and all last week after cleft palate surgery). I can tell you, those things jump around quite a bit! she was up to 180 several times. don't worry!