People suffering from cardiovascular disease have been warned that hot weather can change the properties of some drugs. Therefore, they should be especially attentive to their own health.
Cardiologist Anastasia Lebedeva, in an interview with RIA Novosti, said that the effect of some drugs intended for patients with cardiovascular pathologies may change due to the heat. In hot weather, it is better to plan the day so as not to go out from 11 am to 5 pm. The fact is that heat changes the tone of blood vessels, a person sweats a lot, and together with sweat, many of the most important microelements that affect the rhythm of the heart leave his body.
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Also, with a strong release of sweat, the density of the blood increases, as Anastasia Lebedeva said, and this increases the risk of blood clots. This is why hot weather is not the best habitat for heartworms and they should look for cooler places. If there is no air conditioning in the house, then it is better not to open doors and windows from morning until evening and hang them with a dense, impenetrable fabric that will stop the strong heating of the room.
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In general, hot weather is a strong stress for a Russian organism not accustomed to such a temperature. Therefore, do not rush to sunbathe during the hottest periods of the day, and this is especially true for people who suffer from hypertension and other similar cardiovascular disorders. And among Russians there are more than 30%. (READ MORE) 
Anastasia Lebedeva Medicine Deputy Chief Freelance Specialist- cardiologist of the Moscow Department of Health, head of the regional vascular center “Kommunarka”