The real silent killer: Nocturnal hypertension

The American Heart Association calls high blood pressure the “silent killer.”

That’s because, most of the time, it has no obvious symptoms to tell you that something is wrong. Or, the signs and symptoms are there, but they’re mistaken for symptoms of other conditions.

But scientists are finding out that, for many people, it’s even more dangerous than that. Hypertension sneaks in like a thief in the night, literally, and causes deadly heart disease and stroke for its unsuspecting victims.

Here’s what you need to know, and how you can avoid being the next victim.

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When high blood pressure strikes at night

Normally, blood pressure follows a daily rhythm. It rises higher during the day and falls at night when we sleep.

As we age, however, we may develop a blood pressure pattern called non-dipping. Non-dipping blood pressure tends to remain high overnight.

People ages 55 and older who already have high blood pressure are more prone to non-dipping, also known as nocturnal hypertension.

“Nighttime blood pressure is increasingly being recognized as a predictor of cardiovascular risk,” said Dr. Kazuomi Kario. a professor of cardiovascular medicine at Jichi Medical University in Tochigi, Japan.

Dr. Kario was the lead author of the Japan Ambulatory Blood Pressure Monitoring Prospective (JAMP) study, conducted between 2009 and 2017.

The study measured daytime and nighttime blood pressure levels for 6,359 patients from all over Japan. Overnight levels were measured using an at-home, wearable monitor.

Based on follow-ups over the course of the eight-year study, the researchers found that people whose overnight systolic blood pressure (the top number) was 20 mm Hg above their daytime systolic reading had a significantly higher risk of cardiovascular disease and heart failure.

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How you can avoid nocturnal hypertension

According to Dr. Kario, one explanation for nocturnal hypertension is that it allows the kidneys to fully excrete excess sodium.

“Usually,” he says, “high daytime blood pressure is enough to excrete the sodium. However, in the subjects with increased circulating blood volume (due to increased salt intake and salt sensitivity), blood pressure needs to increase not only during daytime but also nighttime to excrete the sodium from the body. This is the compensated mechanism, but it’s harmful to the heart.”

If you’ve already been diagnosed with high blood pressure, you’re hopefully already being careful about your salt intake. But even if you haven’t, it appears that one really good preventive measure is to start to pay attention to your sodium intake before you get diagnosed.

The timing of your blood pressure medication is another thing that could make a difference…

People tend to take blood pressure medications early in the day for a number of reasons. For starters, blood pressure tends to be higher in the morning, plus it’s just easier to remember to take a pill first thing in the morning. Also, since many medications cause more frequent urination, people may prefer to take them early in the day.

But research published in the European Heart Journal in October suggests that you should consider switching to taking those blood pressure meds in the evening.

In this study, researchers assigned 19,084 patients with high blood pressure to two groups: those who took medication in the morning, and those who took it at bedtime.

The researchers found that those who took bedtime medication had better blood pressure and less risk of illness or death due to heart and blood vessel disease.

For a great overview of other things you can do to keep your blood pressure healthy (including how to cut back on sodium) take a look at this article by my colleague Tracey Ingram: How to DASH your risk for high BP, cholesterol, heart disease and more.

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Abnormal blood pressure levels while sleeping increase risk of heart disease, stroke — Eureka Alert

How Nighttime Blood Pressure May Be More Important Than Daytime Readings — Healthline

Why Taking Blood Pressure Meds at Bedtime May Be More Effective — Healthline

 Bedtime hypertension treatment improves cardiovascular risk reduction: the Hygia Chronotherapy Trial — European Heart Journal

Stroke prognosis and abnormal nocturnal blood pressure falls in older hypertensives — Hypertension

Joyce Hollman

By Joyce Hollman

Joyce Hollman is a writer based in Kennebunk, Maine, specializing in the medical/healthcare and natural/alternative health space. Health challenges of her own led Joyce on a journey to discover ways to feel better through organic living, utilizing natural health strategies. Now, practicing yoga and meditation, and working towards living in a chemical-free home, her experiences make her the perfect conduit to help others live and feel better naturally.