But what is a person supposed to do during those blast-furnace days of July and August?
Perspiration depletes the body of fluids and electrolytes, such as potassium, that are needed for proper heart function. The patient, who is typically also taking a diuretic to excrete excess fluid, then feels the need to drink more water. That in turn dilutes the concentration of electrolytes while raising blood pressure, putting more strain on the heart.
One possible strategy is taking potassium supplements -- a practice that appears to reduce mortality, according to a new
Another tool that may work for some is technology.
As a condition that afflicts 5.8 million people in
And in hot weather, there is an even more basic coping strategy, said
"I've been basically advised not to do anything strenuous outside if it's over 85 degrees," said Paulsen, a survivor of three heart attacks. "Up until a few years ago, I was mowing the lawn and doing things like that when it was 90 degrees."
Heart failure means the heart muscle has become weak and stretched out due to a heart attack, high blood pressure, or other conditions. The organ cannot keep up with the body's oxygen demands, so the patient may feel weak and out of breath. Fluid can build up in the internal organs and lower extremities, hence the need for many to take diuretics to increase urination.
The authors, from
In those who took at least 40 milligrams of a loop diuretic a day, those who also took potassium were 16 percent less likely to die during the eight years that were analyzed, said senior author
In those who took less than 40 milligrams of the diuretic, potassium supplements did not have a statistically significant impact on the patient death rate -- presumably because people who excrete less water do not have as much trouble maintaining their electrolyte levels. Potassium supplements also are available over the counter but are not subject to the same standards as the prescription variety taken by people in the study.
Potassium is essential for the electrical function of cells in the heart and elsewhere -- hence the term electrolyte -- but caution is in order, said
That is not a concern with most people on a regular diet, but potassium can build up in a person with kidney disease, said Mainigi, also an electrophysiologist.
Indeed, in the
Mainigi, who said half of the patients in his practice were on potassium supplements, has high hopes for the new implantable device, which his hospital helped test before it won approval in May.
Called CardioMEMS HF and made by
Heart failure requires maintaining a delicate balance, but the key is the disease can be managed, said Paulsen, secretary-treasurer of the
"Some people think, 'Oh my god, my heart! Life will never be the same,' " Paulsen said. "That's not true."
Heart Failure in the Heat
Hot weather can be especially trying for those with a weakened heart muscle.
Stay out of the heat.
Weigh yourself every morning to make sure you are not retaining fluid.
If you are sweating a lot, drink more. But do not overdo it, as too much fluid could send you into heart failure. Ask your doctor whether you should decrease any diuretic medications to compensate, especially if you notice a drop in your weight.
Go easy on the chips, barbecue, and other summertime foods high in salt, as they lead to fluid retention.
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