and very obviously what happened the nurse drew up 90 units of noef los. and injected the patient with it and 45 minutes later we did cpr on him. >> this is upsetting for you. >> oh, yeah. we killed somebody 's dad. >> according to the doctor, what nurse gardener witnessed is not unusual. the journal suggests that the number of deaths due to medical error are higher than thought. >> the old number of hundred thousand deaths a years outdated and underappreciated with the magnitude of the problem. 251000 in our own analysis. >> it wases very startling. >> dr. michael daniel is the co-author of that report. >> you take a number of 250,000 on its own, you don't have a good idea what that moans and compare the number of deaths dew to cancer and heart disease and respiratory diseases and you realize it is it a large burden and that is scary. >> you stand by the number? >> absolutely. if someone dies of heart disease. the doctor fills out a death certificate and that's how we have the health statistics. >> 90 percent of the diagnossis of the death statistics are