Abstract
Introduction:Nephrolithiasis has a worldwide prevalence of approximately 5 to 15%, and its occurrence is associated with age, sex, race, dietary habits, geographic location, climatic conditions, and other factors. The objective of the present study was to determine the association between climate and the number of hospitalizations for nephrolithiasis (NH) in Brazilian cities located in different climatic regions.Methods:We analyzed data from cities with tropical and subtropical climates. The effects of the lowest (LT), mean (MT), and highest (HT) monthly temperatures and relative humidity of the air (RH) were assessed.Results:A positive association was found between the number of hospitalizations for nephrolithiasis and temperature ((LT x NH; R2=0.218; P<0.0001) (MT x NH; R2=0.284; P<0.0001) (HT x NH; R2=0.317; P<0.0001)), and a negative association was found between the number of hospitalizations for nephrolithiasis and the relative humidity (RH x NH; R2=0.234; P<0.0001). Interactions were also observed between MT and RH with respect to their effects on the NH, as described by a linear model (NH = 4.688 + 0.296 x MT - 0.088 x RH). The NH was higher in cities with tropical climates than in cities with subtropical climates (82.4 ± 10.0 vs 28.2 ± 1.6; P<0.00001).Conclusion:There is an association between the NH and variations in temperature and relative humidity.
Highlights
Nephrolithiasis has a worldwide prevalence of approximately 5 to 15%, and its occurrence is associated with age, sex, race, dietary habits, geographic location, climatic conditions, and other factors
Our study showed significant positive associations between NH and LT as well as MT and HT and a significant negative association between NH and relative humidity (RH), showing that climatic changes can alter the number of new hospitalizations and/or readmissions due to NL
The influence of climate on the prevalence of NL was observed in studies by Eisner et al.[21] and Ross et al.[29], who demonstrated a higher incidence of renal calculi in the summer than in winter
Summary
Nephrolithiasis has a worldwide prevalence of approximately 5 to 15%, and its occurrence is associated with age, sex, race, dietary habits, geographic location, climatic conditions, and other factors. The objective of the present study was to determine the association between climate and the number of hospitalizations for nephrolithiasis (NH) in Brazilian cities located in different climatic regions. Methods: We analyzed data from cities with tropical and subtropical climates. Conclusion: There is an association between the NH and variations in temperature and relative humidity. O objetivo do presente estudo foi determinar a associação entre clima e número de internações por nefrolitíase (IN) em cidades brasileiras localizadas em diferentes regiões climáticas. Nossa avaliação considerou os efeitos das temperaturas mensais mais baixas (TMB), sua média (TM) e mais altas (TMA) e da umidade relativa do ar (UR). Conclusão: Existe associação entre IN e variações de temperatura e umidade relativa
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