Objectives and methods: The objective is to determine the impact of various environmental factors on the decompensation of heart failure. The following data have been collected: 1. Hospital admissions for heart failure in our hospital from January 2012 to August 2017. 2. Weather registry (wind, temperature, humidity, rainfall, atmospheric pressure) in that period (data from Euskalmet, the Basque agency of meteorology). 3. Air quality (% of carbon monoxide, nitric oxide, nitrogen oxide and dioxide, pollution and particulate matter -PM10-, sulphur dioxide, benzenes and toluenes) (data from Open Data Euskadi website).
Results: The database contains 8338 hospitalizations of 5343 different patients (average of 4.02 admissions per day). In the warmer months (June to October) there are significantly fewer hospital admissions due to worsening HF than in the colder months (December to March). The parameter that best predicts HF decompensation is a previous hospital admission due to the same cause (table 1). Within environmental factors, the attribute that best correlates with HF decompensations is temperature, so the lower the temperature, the greater the risk (inverse correlation - Figure 1). The concentrations of sulphur dioxide and nitrogen oxide have a positive correlation with decompensations. Humidity, precipitation and PM10 parameters have not shown significant correlation or relevant p values.
Conclusions: There is a clear relationship between environmental factors and heart failure decompensations. The most relevant being factors are temperature (inverse relationship) and air composition (percentage of sulphur dioxide and nitrogen oxide).