How Does a Heatwave Kill? Understanding the Deadly Effects of Extreme Heat
Author: Dr Sagar Rajkuwar, ENT Specialist, Nashik, Maharashtra, India
🌐 www.entspecialistinnashik.com
By causing the body’s internal cooling processes to fail, which results in serious dehydration, organ damage, and acute cardiovascular or respiratory failure, heatwaves kill people. A fatal biological chain reaction starts when core body temperatures rise above 40° C:
Circulatory overload: The heart has to pump considerably more quickly because blood arteries around the skin widen to assist in cooling down. This extreme strain frequently causes heart failure or strokes in those who already have cardiovascular or respiratory problems.
Inflammation that harms organs: Blood flow to the stomach is decreased as the body redirects blood to the skin to dissipate heat. As a result, the intestinal lining becomes leaky, letting toxins into the bloodstream, which causes a serious inflammatory reaction and multi-organ failure.
Electrolyte Imbalance: Copious sweating removes crucial salts like sodium and potassium from the body. This imbalance might cause unexpected cardiac arrest or spasms by perplexing the nerve and heart cells.
Cellular Breakdown (Heatstroke): Core temperature increases when the body’s cooling systems are overloaded (particularly in high humidity, where sweat cannot evaporate). Physically denaturing (cooking) proteins and cell structures is caused by this intense heat. Kidney failure and blood-brain barrier deterioration can occur when muscle tissue degenerates (a condition known as rhabdomyolysis), flooding the kidneys.
Table of Contents
- Introduction
- What Is a Heat Wave?
- What causes heatwave deaths?
- Who Has the Greatest Risk?
- Immediate Medical Attention Is Required Due to Warning Indicators
- How to Stay Away From Heat-Related Death
- Conclusion
- FAQs – How Does a Heatwave Kill?
Introduction
Heatwaves are some of the most dangerous natural catastrophes on Earth, killing more people than floods, hurricanes, and tornadoes put together. Although many people consider heatwaves to be nothing more than uncomfortable times of hot weather, extreme heat can overwhelm the body’s capacity to control temperature, which can result in significant sickness and even death. Knowing how a heatwave kills may assist people in spotting warning indications, adopting preventative measures, and protecting themselves and their loved ones during periods of excessive heat.
What Is a Heat Wave?
A prolonged period of unusually high temperatures, often accompanied by high humidity, is known as a heatwave. The body’s natural cooling systems may have difficulty keeping a safe internal temperature during a heatwave.
Sweating is the body’s natural cooling mechanism. However, the body can overheat if the temperature is too high or if humidity prevents perspiration from evaporating properly.
What causes heatwave deaths?
Deaths linked to heat often happen when the body is unable to maintain its core temperature. Depending on the individual’s environmental circumstances and health, this process might occur either slowly or quickly.
1. Heat Fatigue
Heat-related sickness usually begins with heat exhaustion.
Symptoms include:
- excessive perspiration
- weakness
- Feeling faint
- Migraine
- Vomiting
- Muscular cramps
- heart racing
Heat stroke can develop from heat exhaustion if it is not treated right away.
2. Heatstroke
A medical emergency that might be lethal is heatstroke.
It happens when the body’s internal temperature goes over 40°C (104°F) and the cooling systems don’t work.
The following are some of the signs and symptoms:
- Disarray
- A person’s loss of awareness
- Epilepsy
- too much sweat or hot, dry skin
- quick breathing
- Fast heartbeat
Heatstroke can result in irreversible organ damage and death if not treated right away.
3. Lack of fluids
Sweating causes a considerable loss of fluid in extreme heat.
Extreme dehydration can cause:
- Poor blood circulation
- Less blood is flowing to the organs.
- Kidney damage
- Imbalance of electrolytes
- Shock
Extreme dehydration might be lethal if left untreated.
4. Malfunction of an Organ
As the body’s temperature increases, essential organs start to fail.
Damage can be caused by heatstroke.
- Head
Heart
Kidneys
The liver
Lungs
Multiple organ failure is a significant cause of death during severe heatwaves.
5. Stress on the Heart and Blood Vessels
The heart has to work harder to cool the body at high temperatures.
This increased workload might cause:
- Attacks on the heart
- Failure of the heart
- Life-threatening arrhythmias
- Attack
People who already have cardiovascular illness are especially at risk.
Who Has the Greatest Risk?
Heat-related fatalities are more common among some populations:
- Senior citizens
- Young youngsters and newborns
- Those who suffer from heart disease
- People who have kidney problems
- Those who have diabetes
- Workers outside
- competitors
- People without air conditioning access
Immediate Medical Attention Is Required Due to Warning Indicators
If someone develops any of the following symptoms, they should get emergency medical treatment.
- Over 104 degrees Fahrenheit (40 degrees Celsius) in body temperature.
- Altered mental state or confusion
- Losing consciousness
- Seizures
- Experiencing respiratory distress
- Excessive lack of water
A medical emergency known as heatstroke needs rapid treatment.
How to Stay Away From Heat-Related Death
You may decrease your risk by doing the following:
- Having a lot of water
- During peak heat, stay inside.
- using fans or air conditioning
- Wearing light attire
- Steering clear of physically demanding outdoor pursuits
- Checking in on senior relatives
- Never leave children or animals in your car.
Conclusion
When very high temperatures overpower the body’s capacity to cool down, heatwaves can turn lethal. Heatwaves are the primary cause of fatalities due to major dehydration, heat exhaustion, heatstroke, organ failure, and cardiovascular problems. During times of severe heat, recognizing the warning signals and using precautionary actions may save lives.
Seek emergency medical attention right away if you think someone is suffering from heatstroke since quick action might save their life.
FAQs – How Does a Heatwave Kill?
1. How can a heatwave claim lives?
By causing major dehydration, heat exhaustion, heatstroke, organ failure, and cardiovascular problems, a heatwave may be fatal. Life-threatening circumstances may arise if the body is unable to control its temperature.
2. What is the leading cause of mortality during a heatwave?
One of the primary causes of death from heatwaves is heatstroke. It happens when the brain and other organs are damaged as a result of an increase in the body’s core temperature to over 40°C (104°F).
3. How does heatstroke turn out to be fatal?
Heatstroke can damage the brain, heart, kidneys, liver, and other vital organs. It might result in numerous organ failures and fatalities if not addressed right away.
4. Is it possible for someone to die from dehydration during a heatwave?
Yes. If left untreated, serious dehydration might result in low blood pressure, renal failure, electrolyte imbalances, shock, and even death.
5. During a heatwave, who is most vulnerable?
Among those at highest risk are:
- Older people
- babies and little kids
- those who have heart illness
- Those who have diabetes
- Workers outside
- Athletes
- Those without air conditioning
6. What are the signs that someone may be suffering from heat exhaustion?
Typical symptoms include:
- A lot of sweating
- Fragility
- Feeling Dizzy
- Migraine
- Nausea
- Cramps in muscles
- Tiredness
7. What are the signs of heatstroke?
Symptoms might be:
- High temperature of the body
- Bewilderment
- Fits
- fast heartbeat
- Losing consciousness
- Excessive perspiration or hot, dry skin
A medical emergency is heatstroke.
8. Is it possible for a healthy person to pass away during a heatwave?
Indeed. Extreme temperatures, particularly during extended outside activity, may cause severe heat-related sickness even in healthy persons.
9. How quickly may a heatwave turn perilous?
In high heat, especially when temperatures are high and humidity is high, heat-related illness can occur in a matter of hours.
10. What is causing heatwaves to become more hazardous?
More individuals are being exposed to hazardous temperatures as heatwaves become more frequent, intense, and lasting as a result of climate change.
11. May heatwaves cause cardiac attacks?
Yes. Stroke, cardiac failure, abnormal heart rhythms, and heart attacks are all at increased risk due to severe heat, which puts more strain on the cardiovascular system.
12. What steps can I take to stay safe during a heatwave?
- Have a lot of water.
- Remain indoors with air conditioning
- Put on light clothes.
- Stay inside during the hottest part of the day.
- Pay attention to the weaker members of the family.
- Never leave youngsters or animals in vehicles.
13. During a heatwave, when should I seek immediate medical attention?
If someone experiences any of the following, call emergency assistance right away:
- Perplexity
- Convulsions
- Unconsciousness
- Trouble breathing
- A body temperature higher than 104°F (40°C)
14. Is it possible for heatwaves to have an impact on mental health and sleep?
Yes. Mental and physical tiredness can be exacerbated by stress, anxiety, sleep disruptions, and extreme heat.
15. Are heatwaves more hazardous than other natural disasters?
Heatwaves are among the most lethal natural disasters since they kill more people in many nations than floods, cyclones, tornadoes, and lightning put together.
Medical Disclaimer
Medical Disclaimer: This content is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Heatstroke is a medical emergency. Seek immediate medical attention if someone develops confusion, loss of consciousness, seizures, or a body temperature above 40°C (104°F).
How Does Extreme Heat Impact Our Health? Signs, Risks & Prevention
https://healthuseful.com/how-does-extreme-heat-impact-our-health/
Heat and health
Important details
Heat is a significant hazard to environmental and occupational health. One of the main causes of fatalities related to weather is heat stress. It can also worsen pre-existing conditions like asthma, cardiovascular disease, diabetes, and mental health issues, as well as raise the chance of accidents and the spread of certain infectious diseases. Heatstroke is a medical emergency that has a high fatality rate.
Climate change is causing a rapid increase in the number of individuals who are exposed to severe heat worldwide. Between 2000–2004 and 2017–2021, the death rate for those over 65 increased by around 85% .
Between 2000 and 2019, approximately 489,000 heat-related deaths occur each year, with 45% of these occurring in Asia and 36% in Europe . During the summer of 2022 in Europe alone, an estimated 61,672 extra fatalities related to heat were reported . Events of extreme heat can cause extremely high death rates. 70,000 fatalities occurred in Europe as a result of the June–August event in 2003. During a 44-day heatwave in the Russian Federation in 2010, there were 56,000 more deaths.
Exposure characteristics like job and socioeconomic circumstances and physiological elements like age and health status all contribute to heat vulnerability.
With certain public health and multi-sectoral policies and interventions, the harmful health consequences of heat may be foreseen and largely averted. The WHO has provided public health
organizations with instructions on how to recognize and deal with excessive heat dangers. Comprehensive risk management and preparedness, together with action on climate change, can save lives both now and in the future.
Review
When a succession of exceptionally warm days and nights causes a localized surplus of heat to build up, it’s called a heatwave. Climate change is causing heatwaves and lengthy periods of extreme heat to occur more often, last longer, become more intense, and grow in scale. Vulnerable communities’ health and well-being might be affected by even heat waves of moderate and low intensity.
Due to climate change, the frequency and intensity of severe heat and heat waves will persist to grow throughout the twenty-first century. Long durations of high day and night temperatures place a cumulative stress on the human body, raising the likelihood of sickness and death from heat exposure. Heatwaves may have a rapid and short-term impact on a large population, frequently cause public health crises, and result in excess mortality and cascading socioeconomic effects (such as diminished work capacity and labour productivity). When power outages accompany heatwaves and disrupt water infrastructure, transport, and health facilities, they can also cause a loss of health service delivery capacity.
Populations are becoming more sensitive to the bad impacts of heat as a result of population ageing and the rising incidence of non-communicable diseases (respiratory and cardiovascular diseases, diabetes, dementia, renal disease, and musculoskeletal disease). With greenspace being lost and improper housing materials like metal roofs amplifying human exposure to extra heat, cities are not being designed to minimize the accumulation and creation of urban heat.
Lack of knowledge about the health concerns associated with heat persists among healthcare professionals and the general public. Health professionals should adapt their guidance, planning, and interventions to increasing heat exposures and to handle heatwave-related acute rises in admissions. At the person, community, organization, government, and societal levels, practical, doable, and frequently low-cost interventions can save lives.
Who suffers from it?
Many populations in subtropical and tropical climes are constantly subjected to high temperatures. In higher and middle latitudes, population exposure to extra heat is seasonal.
The particular vulnerability of adults to heat due to medical or physiological reasons has been extensively documented (4). Heat can have a detrimental impact on one’s health via several direct and indirect methods. There is little research on the effects of long-term (continuous) exposure to heat and humidity.
Athletes, manual and outdoor workers, and civil protection personnel are all susceptible to exertional heat stress and exposed to excessive heat due to their jobs.
Due to low-quality houses and limited access to cooling, urban and rural poor are disproportionately affected by overheating. Informal communities in certain cities are frequently hotter than other urban regions due to construction materials. In determining heat exposure, gender can be very significant, especially when women are mostly responsible for cooking inside during hot weather.
How does heat affect health?
A mix of factors, including (a) the body’s inability to expel internal heat generated by metabolic processes due to environmental heat stress (high temperature, high humidity, low wind, high thermal radiation, etc.), (b) clothing that blocks heat loss, and (c) external heat gain from the environment, all affect how much heat is stored in the human body.
In such circumstances, the body’s inability to control interior temperature and release heat buildup raises the danger of heatstroke and heat exhaustion. The heart and kidneys are also under strain from the body’s efforts to keep cool. Because of this, heat extremes can worsen chronic illnesses’ health risks (cardiovascular, mental, respiratory, and diabetic conditions) and result in severe renal damage.
Extreme heat waves cause rapid fatalities and hospitalizations (the same day and the days immediately following), necessitating quick responses when a heat alert is issued.
Heat may also disrupt and endanger key health services, such as transportation and electricity supply. Working productivity will decrease and the likelihood of accidents will increase as a result of heat. In extremely hot temperatures, it might be tough to do homework or study, and heatwaves may force educational institutions to close. Heatwaves can also be linked to harmful air pollution episodes.
The timing, intensity, and duration of a heat event, as well as the degree of acclimatization and adaptability of the local people, infrastructure, and institutions to the prevailing climate, all influence the extent and nature of the health effects of heat.
What actions ought the general public to take?
Avoid the heat
- During the hottest part of the day, refrain from outside activity and strenuous exertion.
- Remain in the shade. Keep in mind that the apparent temperatures in the sun can range from 10 to 15 degrees Celsius higher.
- Spend two to three hours during the day in a cool location.
- Watch out for drowning. Never swim alone.
- Maintain awareness of official heat warnings.
Maintain the temperature of your house.
- Open the windows after night when the outside temperature is lower than the interior temperature to let the night air cool down your house.
- To prevent direct sunlight from entering the house during the day when outside temperatures are hotter than inside temperatures, close and cover the windows with blinds or shutters. Try to switch off as many electrical gadgets as you can.
- Only use electric fans when the temperature is below 40 degrees Celsius (104 degrees Fahrenheit). Fans will raise the temperature of the body when the air temperature is over 40°C or 104°F.
- Turn on an electric fan and set the thermostat to 27°C (81°F) if you’re using air conditioning; this will make the space feel 4°C cooler. Additionally, it may lower your electricity usage for cooling by up to 70%.
- Don’t forget that it could be cooler outside in the shade.
Maintain a cool and hydrated physique.
- Wear bed linens and garments that are light and loose-fitting.
- Bathe or shower in cold water.
- Spray, wet light clothing, or moisten your skin with a damp towel.
- Drink water on a regular basis (at least 2–3 litres per day and 1 cup of water every hour).
- Regularly check on the vulnerable persons in your circle, particularly those who are elderly (over 65), have a disability, and live alone, as well as people with heart, lung, or kidney illnesses.
- Babies and Children are safeguarded.
- Never leave kids or animals in parked cars for any period of time since temperatures can get dangerously high in a short amount of time.
- Seek shade or remain inside during peak hours to avoid direct sun exposure. More than 10 degrees Celsius can be reduced by shade in how hot you feel.
- Dry cloth should never be used to cover a baby stroller or pram as this will make the inside of the carriage warmer. Instead, lower the temperature using a wet, thin cloth and rewetting it as needed. For even more cooling, pair it with a portable fan.
- Children should wear light, loose-fitting attire that covers their skin, and wide-brimmed hats, sunglasses, and sunscreen should be used to protect them from the sun’s rays.
- Observe the guidelines for keeping your residence at a safe temperature.
WHO response
To decrease human expenses from extreme heat, we must act quickly and lessen greenhouse gas emissions to mitigate climate change. WHO is addressing climate change through the Alliance for Transformational Change in Climate and Health (ATACH) as well as country support of technical and policy resources to assist the health sector and communities adapt to the risks of climate change.
In order to map the risks, vulnerable populations, available capacities and resources, WHO collaborates with the health sector to strengthen governance, preparedness, and response to acute heatwave effects by creating heat early warning systems and warnings, heat action plans, and emergency response plans. High-risk groups without access to cooling, such as those in schools, health facilities, and nursing homes, are protected by these programs.
WHO co-sponsors the Global Heat Health Information Network in order to facilitate knowledge and information sharing on the dangers of extreme heat and the ways to address them. The World Health Organization collaborates closely with the World Meteorological Organization to create Heat Health Warning Systems.
References
- World Health Organization – Heat and Health Fact Sheets.
- World Health Organization Heat and Health Resources
- Centers for Disease Control and Prevention – Heat-Related Illness Prevention and Safety.
- CDC Extreme Heat Information
- National Weather Service – Heat Safety Guidelines.
- National Weather Service Heat Safety Tips
- National Institutes of Health – Research on heat-related illness and mortality.
- Mayo Clinic – Heatstroke symptoms, causes, and treatment.
