Explain Why Scientists Believe That Warm Climates Provide Greater Biodiversity. Climate change may cause spike in low sodium-related hospitalizations

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Explain Why Scientists Believe That Warm Climates Provide Greater Biodiversity.

Share on PinterestClimate change and rising temperatures could affect salt levels in the blood. Xvision/Getty ImagesSodium is an electrolyte that is essential for a wide range of body functions.Hyponatremia is a common condition that causes sodium levels in the blood to be lower than normal.A new study has found that more people become hospitalized due to hyponatremia in temperatures above 15 degrees Celcius.With climate change expected to increase temperatures across the world, the study predicts that an increase of 2 degrees Celsius could increase cases of hyponatremia by 13.9%The human body needs sodium for various body functions — from conducting nerve impulses to regulating heart rate, digestion, brain activity, and blood pressure.Hyponatremia is a common electrolyte disorder characterized by low levels of sodium in the blood. The condition is seen in up to 30% of all hospitalized patients.A person with mild hyponatremia may have no symptoms but if sodium levels drop too low or too fast, symptoms might include difficulty concentrating, headaches, and nausea. In more severe cases, symptoms can include confusion, seizures, and coma.Having diarrhea, vomiting, sweating, or having underlying heart or liver disease and/or kidney failure can cause hyponatremia. Seasonal changes in temperatures have also been linked to an increase in the prevalence of hyponatremia in patients attending the emergency department in the summer months.In a recent study, researchers at the Karolinska Institute quantified the effect of outdoor temperature on the risk of hospitalization with hyponatremia.The retrospective study, published in The Journal of Clinical Endocrinology and Metabolism, included the entire Swedish population over 18 years of age.The researchers used data from the National Patient Register (NPR) in Sweden to study the incidence rates for hyponatremia at a given outdoor temperature, in increments of 1 degree Celsius. They identified 11,213 patients hospitalized with hyponatremia between October 2005 and December 2014. The researchers retrieved data on the 24-hour mean temperature of the day when each patient was admitted to hospital from the Swedish Meteorological and Hydrological Institute (SMHI). Speaking to Medical News Today, study co-author Dr. Jakob Skov pointed out a critical finding: “[T]he risk of severe hyponatremia appears to increase dramatically above certain temperature thresholds, and [the] elderly (unsurprisingly) are at greatest risk.”On the hottest days, women and those over 80 were at the highest risk. Those over 80 were 15 times more likely to be hospitalized due to hyponatremia compared to cooler days.The team also noted that the incidence of hyponatremia was the highest over the summer months and decreased gradually toward the winter, with January seeing the lowest numbers.The study estimates that an average increase in temperature of 1 degree Celsius will lead to a 6.3% increase in the incidence of hospitalizations due to hyponatremia. An increase of 2 degrees, according to projections, would result in a 13.9% increase.Discussingthe mechanism behind the rise in cases, Dr. Skov told MNT:“Oversimplified, hyponatremia can be the result of sodium deficiency (low intake or high losses) or excess water. [T]here are two plausible explanations for heat-related hyponatremia—salt loss from sweating resulting in a sodium deficit or excessive hydration due to an exaggerated fear of dehydration. Both conditions can be easily treated, but we need to know which one is responsible.”Dr. Skov speculated that for the elderly in nursing homes, overhydration might be the most likely cause, but more data was needed to confirm.MNT spoke to Joseph A Vassalotti, MD, chief medical officer for the National Kidney Foundation and clinical professor at the Icahn School of Medicine at Mount Sinai, who was not involved in the study. He explained that hyponatremia is “a relatively common condition in up to 30% of hospitalized patients that may occur independently of a kidney problem.” “The results suggesting an association with increased hyponatremia hospitalization with global warming are interesting,” he said. Describing the study as “hypothesis-generating,” Vassalotti cautioned that “[It] will require investigation in other climates, countries and with more contemporary data after 2014 to confirm.”When asked about the next steps for the research, Dr. Skov explained to MNT that the team will look to expand their findings to other countries with warmer climates. “The threshold of 15°C observed in Sweden (above which the risk increased rapidly) is unlikely to be relevant in warmer climates,” he said. His team will now seek to uncover whether there is a different threshold in regions with higher temperatures.The study suggests that rising temperatures over the coming decades could increase the number of patients hospitalized with hyponatremia by around 10%. Hence, the researchers say, countries will need to employ clinical monitoring strategies to protect the vulnerable and reduce their risk.“[T]his study highlights the risk of hyponatremia in relation to high temperatures in vulnerable populations. Consequently, these individuals should be monitored for symptoms of hyponatremia during heat waves,” Dr. Skov said. However, he also acknowledged a shortcoming of the study:“By design, the study can’t explore potential mechanisms of hyponatremia (that could result in changed treatment recommendations).”

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What Could Happen in a World That's 4 Degrees Warmer | WIRED Brand Lab

Produced by WIRED Brand Lab for Western Digital.

Comedian Aparna Nancherla explores how global warming and climate change will directly affect our lives 100 years from now when the average global temperature is projected to increase by 4 degrees Celsius, or 7.2 degrees Fahrenheit. Nancherla met with Professor of Atmospheric Science at UC Berkeley, Inez Fung, and Chief Data Officer at Western Digital, Janet George to to make predictions about how we’ll live in a 4C World.

Learn more: http://www.datamakespossible.com/DataImpact

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What Could Happen in a World That’s 4 Degrees Warmer | WIRED Brand Lab

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