Abstract
BackgroundTo analyze hospitalization episodes with an ICD-9 diagnosis code of influenza (codes 487 and 488) in any diagnostic position from 2009 to 2015 in the Spanish hospital surveillance system.MethodsInformation about age, length of stay in hospital, mortality, comorbidity with an influenza diagnosis code between 1 October 2009 and 30 September 2015 was obtained from the National Surveillance System for Hospital Data (Conjunto Mínimo Básico de Datos, CMBD).Results52,884 hospital admissions were obtained. A total of 24,527 admissions corresponded to diagnoses ICD-9 code 487 (46.4%), and 28,357 (53.6%) corresponded to ICD-9 code 488. The global hospitalization rates were 8.7 and 10.6 per 100,000 people, respectively. Differences between the two diagnostic groups were found for each of the six analyzed seasons. The diagnostic ICD-9-CM 488, male gender, and high-risk patients classified by risk vaccination groups showed direct relationship with inpatient hospital death.ConclusionsInfluenza diagnosis was present in a significant number of hospital admissions. The code used for diagnosis (ICD-9-CM 488), male sex, age groups and associated risk clinical conditions showed a direct relationship with inpatient hospital fatality.
Highlights
To analyze hospitalization episodes with an ICD-9 diagnosis code of influenza in any diagnostic position from 2009 to 2015 in the Spanish hospital surveillance system
Regardless, since H1N1pdm09 was considered a seasonal strain after 2010, we can’t exclude that in code 487 we find H1N1pdm09 cases
No significant differences were found in sex and its distribution by diagnostic group (p = 0.63)
Summary
To analyze hospitalization episodes with an ICD-9 diagnosis code of influenza (codes 487 and 488) in any diagnostic position from 2009 to 2015 in the Spanish hospital surveillance system. In Spain, the cumulative incidence of influenza adjusted for age has varied in recent years between 2781 cases per 100,000 people in the 2009–2010 season and 1649 cases per 100,000 people in the 2016–2017 season [4]. In this latter season, patients over 65 years of age accounted for almost 75% of severe hospitalized cases of confirmed influenza. The inpatient fatality rate was 15% of the confirmed influenza cases, and 85% of the deaths occurred in the age group older than 65 years [4]
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