Heat stress isn't just about heatstroke. It's much more silent & severe, Pg14

Key Highlights:

• A recent study indicates that 57% of Indian districts, housing 76% of the population, are highly prone to heat stress.
• The WHO identifies heat stress as the leading cause of weather-related deaths, exacerbating conditions like cardiovascular disease, diabetes, and mental health.
• Heat Action Plans (HAPs), like the one implemented in Ahmedabad in 2010, have shown a 40% reduction in mortality.
• The National Centre for Disease Control (NCDC) reported 7,192 suspected cases of heatstroke last year.

Detailed Insights:

• Heat stress occurs when the body's thermal regulation is overwhelmed, leading to increased heart rate, dehydration, and potential organ dysfunction.
• High humidity hinders sweat evaporation, increasing the 'felt' temperature and making even moderate heat dangerous, especially in urban heat islands.
• Indirect impacts of heat stress account for 90% of heat-related illnesses, affecting key organs like the heart and kidneys, and worsening pre-existing conditions.
• Pregnant women are more susceptible to heat stress due to increased blood volume, potentially leading to reduced blood flow to the placenta and birth defects.
• Tracking all-cause mortality, emergency room visits, and hospital admissions can provide a clearer picture of the crisis, beyond just counting heatstroke cases.
• Cities need designated leadership for heat response, similar to vaccination programs, with a national dashboard combining mortality, hospital data, and clinic visits.
• Heat Action Plans require a legal mandate and dedicated budgets to be effective, incorporating climate projections and hyperlocal vulnerability assessments.

Key Concepts Involved:

• Heat Stress: Condition where the body cannot effectively cool itself, leading to a range of health issues.
• Heatstroke: A severe form of heat illness where the body's temperature rises dangerously high, causing organ damage.
• Urban Heat Island: Metropolitan area that is significantly warmer than its surrounding rural areas due to human activities.