Grass pollen exposure associated with higher pediatric asthma readmission rates

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February 2, 2023

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According to a study published in , children and adolescents with asthma experienced statistically significantly higher readmission rates during the grass pollen season compared to other years. Pediatric Allergy and Immunology.

Preventive therapy before the grass pollen season can reduce readmissions. Mehak Batra, PhD, MPH, MDS, Fellow and colleague in the Department of Public Health, School of Psychology and Public Health, La Trobe University, Melbourne, Australia, writes.


Preventive therapy before the grass pollen season begins may reduce the need for asthma readmissions, researchers report. Source: Adobe Stock

Researchers examined data from the Victorian Admitted Episodes Dataset on 47,456 children and adolescents (age range 2-18 years, 60.2% male) hospitalized for asthma. They also collected meteorological data from the Bureau of Meteorology and the Victorian Environmental Protection Agency between 1997 and 2009.

Within 28 days of hospital discharge, 2,152 (4.53%) of these patients were readmitted for asthma, with a mean readmission rate of 0.49 (standard deviation). [SD]0.72).

Patients aged 2 to 5 years had a mean daily readmission rate of 0.26 (SD 0.52) compared with those aged 6 to 12 years (0.14; SD 0.38) and those aged 13 to 18 years (0.07; SD 0.28). ) was expensive. Boys also had a higher mean daily readmission rate (0.27; SD, 0.54) than girls (0.21; SD, 0.46).

The average number of readmissions per day was also above the overall average during peak pollen seasondefined as October through December. Daily grass pollen concentration 0 grain/m range3 and 356 grains/m3.

The average daily readmission rate was 1.44-fold (95% CI, 1.03-2.02) higher during the grass pollen season compared to outside the pollen season.

Patients aged 2 to 5 years had the highest rate of readmission, with an incidence rate ratio (IRR) of 1.99 (95% CI, 1.26-3.14), followed by patients aged 6 to 12 years (IRR = 1.47; 95%). CI 0.78-2.79) and patients aged 13 to 18 years (IRR = 0.6; 95% CI 0.29-1.23).

In addition, the researchers found a significant non-linear association between lag 2 daily pollen concentrations and all daily readmissions (P. = .03), and children aged 2 to 5 years (P. = .02) and 6–12 years (P. < .001), among boys (P. = .01).

For lag 0, researchers observed only a weak association between average daily readmission rates and grass pollen >128 grains/m2.3.

Additionally, researchers found that patients aged 6 to 12 years experienced a significant association between 4-day cumulative pollen levels and daily readmissions.

Based on these findings, the researchers sought interventions targeted at children with severe or uncontrolled asthma before the start of the pollen season. is needed. This may reduce readmissions and improve both treatment adherence and patient satisfaction.

Daily monitoring of readmissions and follow-up of children at high risk of readmission, together with stronger links with health care systems and communities, including asthma education, may prevent hospitalizations and readmissions. writes the researcher.

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