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Hospital admissions prior to primary intracerebral haemorrhage and relevant factors associated with survival

      Abstract

      Background

      Identification and modification of risk factors are essential for preventing intracerebral hemorrhage (ICH). Prior hospital admissions provide opportunities to intervene. We reported hospital admissions prior to primary ICH and investigated factors associated with survival.

      Methods

      Cohort design using patient-level data from the Australian Stroke Clinical Registry (2009-2013) linked with hospital administrative datasets from four states (VIC, NSW, WA, QLD). Prior hospital admission is divided into within 90 days and more than 90 days prior to the index ICH event. The International Classification of Diseases and Related Health Problems, Tenth Revision, Australian Modification codes were used to define principal diagnoses of previous admissions/presentations and comorbidities. Factors associated with survival after ICH were investigated using Cox proportional hazards regression.

      Results

      Among 15,482 admissions for stroke, 2,098 (14%) had an ICH (median age 76 years, 52% male), 1,732 patients (83%) had a prior hospital admission, including 440 patients (21%) within 90 days of their index ICH admission. Patients with prior admission were older, had more comorbidities, and greater hospital frailty risk score than those without prior admission. Diseases of the circulatory system (14%) were the most common principal diagnoses for hospital admissions prior to ICH. Of the comorbidities associated with survival, neoplasms conferred the greatest hazard of death at 180 days after ICH (adjusted hazard ratio 1.42, 95% confidence interval 1.15 – 1.76, p = 0.001).

      Conclusion

      Hospital presentations in the 90 days prior to ICH are common. Future research should be focussed on identifying opportunities for preventing ICH.

      Key words

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