Mobile intensive care units. An evaluation of effectiveness

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Abstract
Implementation of mobile intensive care units in four suburban communities permitted a retrospective evaluation of their impact on patient outcome. Data on 1,796 cases of myocardial infarction were obtained from medical records and death certificates of patients arriving at four hospitals during a 65-month period. There were statistically significant reductions in mortality rates in two communities (41.1% to 23.9% and 37.6% to 27.0%) after the service began. A reduction in one community (34.5% to 22.0%) was not statistically significant, and the fourth community showed an increase in the mortality rate (31.1% to 44.0%). Analysis of plausible rival hypotheses permitted most of these to be ruled out as causes for the observed reductions in mortality. (JAMA 241:1899-1901, 1979)

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