RT Journal A1 Epstein MA T1 DEmand pacemakers JF Archives of Internal Medicine JO Archives of Internal Medicine YR 1979 FD July 1 VO 139 IS 7 SP 829 OP 829 DO 10.1001/archinte.1979.03630440087032 UL http://dx.doi.org/10.1001/archinte.1979.03630440087032 AB To the Editor.—  I was interested in the article by Ali et al in the October 1978 issue of the Archives (138:1534-1537, 1978). I think it is quite interesting, but it would be worth pointing out an experience I have had. I have found that with most demand pacemakers, if the magnet is manipulated properly over the pulse generator, it is possible to turn the unit off rather than just convert it to the fixed-rate mode. Under these circumstances, if the patient has a rhythm of his own, it will come out and also aid in the diagnosis of possible myocardial infarction. We have done this in a number of patients with good results, although we insist that a physician rather than a technician do the manipulating in the attempt to turn the unit off.