These results suggest the advisories provided to the public during the heat wave in Ohio were most adhered to by the sensitive populations (very young and elderly). Middle-aged males were most susceptible to HRI during the peak of the heat wave. Temperature and dew point showed a strong relationship with HRI and were modeled as significant predictors of HRI. Additional analyses should be completed to further evaluate this relationship. Finally, obtaining patient diagnosis records from the hospital EDs would provide strength in validating the observed results.