Warmer nights can lead to more cardiovascular deaths among men


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Warmer-than-usual summer wear appears to lead to an increase in cardiovascular deaths in men in their early 60s, but not women, suggests new research published in the online journal BMJ open.

Previous studies have focused on the potential for hot weather conditions during the summer that involve extreme or sustained periods of high temperatures to coincide with increases in deaths and hospitalizations due to cardiovascular conditions.

However, findings related to age and gender have so far been contradictory, and therefore researchers from the University of Toronto, Canada, have tried to find any possible link between high summer temperatures at night and increased deaths from cardiovascular disease (CVD) among people aged 60 and 69 years.

They studied data from the Office for National Statistics on adult deaths attributed to CVD for the months of June and July in each year between 2001 and 2015 in England and Wales because heat waves in the UK are most and intense during these months.

They also collected similar information from official U.S. data for King County, Washington, a region similar to the ocean, on parallel latitudes with England and Wales, with comparable land-ocean atmospheric properties and similarly low incidence of residential air conditioning. However, the US data included only men.

In addition, they looked at official meteorological data from the UK and the US

Results showed that between 2001 and 2015, 39,912 CVD deaths (68.9% men) were recorded in England and Wales and 488 deaths in King County.

In England and Wales, after certain variables were provided for, a 1 ° C rise in the usual summer night temperature was associated with a 3.1% increase in the risk of CVD mortality among men aged 60–64, but not older men or any of them. women age groups.

In King County, a 1 ° C rise was associated with a 4.8% increased risk of CVD deaths among those aged 65 and younger, but not in older men.

Over the 15-year period observed, CVD rates have generally dropped significantly in both regions annually and especially over the summer months, in line with larger population surveys of effective primary and secondary preventative therapies over time.

Nevertheless, a significant residual risk persisted, the authors said, and in England and Wales, event rates remained more than 50% higher in adults between the ages of 65-69 than in the 60-64 age group.

This was worrying, they added, because in recent years, populated regions such as those studied have experienced a proportionate increase in the intensity of summer heat at night rather than during the day.

This is an observational study, so can not determine causality, and the researchers acknowledge certain limitations on their work, such as the unavailability of 15-year gender and age-specific weekly outcome and exposure data by district or city level, which may have stronger associations between nocturnal summer heat and CVD deaths identified in populated urban regions.

However, one of the study’s strengths was the large population size data and the use of strict national mortality and meteorological data.

They concluded: “Current findings should stimulate similar exposure to exposure and event rates in other populated mid-latitude to high-latitude regions.

“With the increasing likelihood of extreme summers in the Western U.S. and the United Kingdom, our results invite preventative population health initiatives and new urban policies aimed at reducing future risk of CVD events.”

Higher risk of temperature-related death if global warming exceeds 2 C

More information:
Warmer summer nocturnal surface air temperatures and cardiovascular disease death risk: a population-based study, BMJ open (2022). DOI: 10.1136 / bmjopen-2021-056806

Provided by British Medical Journal

Quotation: Warmer nights could lead to more cardiovascular deaths among men (2022, March 28) Retrieved March 28, 2022 from https://medicalxpress.com/news/2022-03-warmer-nights-cardiovascular-deaths-men.html

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