Validity of reported data in the Swedish Cardiac Arrest Register in selected parts in Sweden |
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Authors: | A Strömsöe L Svensson ÅB Axelsson K Göransson L Todorova J Herlitz |
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Institution: | 1. School of Health and Social Sciences, University of Dalarna, SE-791 88 Falun, Sweden;2. Institute of Internal Medicine, Department of Metabolism and Cardiovascular Research, Sahlgrenska University Hospital, SE-413 45 Gothenburg, Sweden;3. South Hospital, SE-118 83 Stockholm, Sweden;4. Institute of Health and Caring Science, Sahlgrenska Academy at Gothenburg University, Gothenburg, Sweden;5. Department of Emergency Medicine, Karolinska University Hospital, SE-171 76 Stockholm, Sweden;6. Department of Medicine, Solna, Karolinska Institutet, SE-171 76 Stockholm, Sweden;g The Pre-hospital Centre of Region Skåne, Lund, University of Skåne, SE-221 85 Lund, Sweden;h The Pre-hospital Research Centre of Western Sweden, Prehospen, University College of Borås, SE-501 90 Borås, Sweden |
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Abstract: | AimTo describe differences and similarities between reported and non-reported data in the Swedish Cardiac Arrest Register in selected parts in Sweden.MethodsProspective and retrospective data for treated OHCA patients in Sweden, 2008–2010, were compared in the Swedish Cardiac Arrest Register. Data were investigated in three Swedish counties, which represented one third of the population. The recording models varied. Prospective data are those reported by the emergency medical service (EMS) crews, while retrospective data are those missed by the EMS crews but discovered afterwards by cross-checking with the local ambulance register.ResultIn 2008–2010, the number of prospectively (n = 2398) and retrospectively (n = 800) reported OHCA cases was n = 3198, which indicates a 25% missing rate.When comparing the two groups, the mean age was higher in patients who were reported retrospectively (69 years vs. 67 years; p = 0.003). There was no difference between groups with regard to gender, time of day and year of OHCA, witnessed status or initial rhythm. Bystander cardiopulmonary resuscitation (CPR) was more frequent among patients who were reported prospectively (65% vs. 60%; p = 0.023), whereas survival to one month was higher among patients who were reported retrospectively (9.2% vs. 11.9%; p = 0.035).ConclusionAmong 3198 cases of OHCA in three counties in Sweden, 800 (25%) were not reported prospectively by the EMS crews but were discovered retrospectively as missing cases. Patients who were reported retrospectively differed from prospectively reported cases by being older, having less frequently received bystander CPR but having a higher survival rate. Our data suggest that reports on OHCA from national quality registers which are based on prospectively recorded data may be influenced by selection bias. |
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Keywords: | Characteristics Cardiac arrest Register Survival Validity |
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