Humidity can be life-threatening for individuals with heart disease. Even in temperatures that do not seem extreme, when humidity is above 70 percent, the incidence of complications such as dehydration, fatigue and heat-related illnesses are elevated. Obese individuals with heart disease may be at particular risk because the body's ability to maintain a normal temperature is compromised. These individuals may lose salt due to profuse sweating, which can lead to heat exhaustion and eventually a heat stroke.
Heat Stroke
Humidity and heat make it difficult for the body to release heat because sweat does not evaporate as quickly. Because individuals with heart disease already have reduced heart functioning, they, as well as elderly individuals and babies, are at greatest risk for a heat stroke. A heat stroke is the most serious complication caused by heat exposure. A person suffering from a heat stroke can experience shock, organ failure, brain damage and possibly death.
Heat Exhaustion
Heat exhaustion, though less serious than a heat stroke, is still a life-threatening condition. The condition can develop several days after the initial exposure to high humidity and heat. Nausea, vomiting, fainting and general weakness are all symptoms of heat exhaustion. Those with heart disease are more likely to develop this condition because of the rapid loss of salt that can occur with increased sweating. Low salt levels in the muscles can cause cramping that may signal heat exhaustion. For more information regarding heat exhaustion and other related conditions, see Resources section.
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