We have heard of heat waves that strike unexpectedly during summer months, capable of causing even death, but there is no scientific definition for these occurences yet.
Researchers writing in BioMed Central's open access journal Environmental Health have created a definition that they use to document, for the first time, how heat wave mortality impact differs between European cities.
Daniela D'Ippoliti from the Regional Health Authority, Rome, Italy, worked with an international team of researchers to develop the new definition and then used it to compare the impact of heat waves on mortality in different European cities. She said, "Heat waves of long duration had the greatest impact on mortality, and resulted in 1.5 to 3 times higher daily mortality than others. The elderly are most at risk during heat waves, especially women. And the excess mortality is mostly in regard to respiratory, rather than cardiovascular, mortality."
Speaking about future applications of this work, D'Ippoliti said, "Climate change predictions for Europe show an increase in the frequency and the intensity of heat waves, especially in central, southern and eastern Europe, and as consequence heat-related mortality will become a relevant threat even in cities usually not exposed to extreme hot temperatures. Because the impact of heat waves differs between cities, public health interventions need to be tailored to the specific needs and should focus on the elderly, especially women living in urban areas".