Tetsuhisa Kitamura1, Taku Iwami1, Takashi Kawamura1, Chika Nishiyama1, Tomohiko Sakai2, Kayo Tanigawa-Sugihara1, Mie Sasaki3, Kentaro Kajino4, Taro Irisawa2, Sumito Hayashida5, Tatsuya Nishiuchi6, Atsushi Hiraide7. 1. Health Service Kyoto University Kyoto Japan. 2. Department of Traumatology and Acute Critical Medicine Graduate School of Medicine, Osaka University Suita Japan. 3. Nursing Science Division, Department of Human Health Science, Graduate School of Medicine Kyoto University Kyoto Japan. 4. Emergency and Critical Care Medical Center Osaka Police Hospital Osaka Japan. 5. Osaka Municipal Fire Department Osaka Japan. 6. Osaka Prefectural Senshu Critical Care Medical Center Izumi-Sano Japan. 7. Center for Medical Education, Graduate School of Medicine Kyoto University Kyoto Japan.
Abstract
AIM: This study investigated the association between the number of phone calls made to hospitals from ambulances requesting if they can accept prehospital emergency patients with cardiovascular events, and the prehospital transportation time. METHODS: Using ambulance records, we retrospectively enrolled adult patients suffering acute myocardial infarction from 1998 to 2007, and out-of-hospital cardiac arrest of cardiac origin from 2000 to 2007, transported to medical institutions by the emergency medical service in Osaka City. RESULTS: During the study period, 8,596 patients with acute myocardial infarction without arrest and 9,283 out-of-hospital cardiac arrests of cardiac origin were registered. The hospital arrival time (from patient's call until hospital arrival) increased along with the increasing number of phone calls to hospitals from ambulances for patients with acute myocardial infarction (from 23.2 min with one phone call to 39.7 min with ≥5 phone calls; P for trend <0.001), and for those with out-of-hospital cardiac arrest (from 24.4 min with one phone call to 36.6 min with ≥5 phone calls; P for trend <0.001). In a multivariable analysis, chronological factors such as weekend and night-time were significantly associated with an increment in the phone calls to hospitals from ambulances. CONCLUSIONS: From ambulance records in Osaka City, we showed that the increased number of phone calls to hospitals from ambulances led to prolongation of the hospital arrival time.
AIM: This study investigated the association between the number of phone calls made to hospitals from ambulances requesting if they can accept prehospital emergency patients with cardiovascular events, and the prehospital transportation time. METHODS: Using ambulance records, we retrospectively enrolled adult patients suffering acute myocardial infarction from 1998 to 2007, and out-of-hospital cardiac arrest of cardiac origin from 2000 to 2007, transported to medical institutions by the emergency medical service in Osaka City. RESULTS: During the study period, 8,596 patients with acute myocardial infarction without arrest and 9,283 out-of-hospital cardiac arrests of cardiac origin were registered. The hospital arrival time (from patient's call until hospital arrival) increased along with the increasing number of phone calls to hospitals from ambulances for patients with acute myocardial infarction (from 23.2 min with one phone call to 39.7 min with ≥5 phone calls; P for trend <0.001), and for those with out-of-hospital cardiac arrest (from 24.4 min with one phone call to 36.6 min with ≥5 phone calls; P for trend <0.001). In a multivariable analysis, chronological factors such as weekend and night-time were significantly associated with an increment in the phone calls to hospitals from ambulances. CONCLUSIONS: From ambulance records in Osaka City, we showed that the increased number of phone calls to hospitals from ambulances led to prolongation of the hospital arrival time.
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