Frequent urination at night sign of hypertension – Study

A new study conducted in Japan has found that frequent nighttime
urination, called nocturia, may be linked to hypertension and high salt
intake.

Nocturia is a condition in which people wake up during the night
because they need to urinate. Common causes of frequent trips to the
toilet at night include high fluid intake, sleep disorders, and bladder
obstruction.

People without nocturia can sleep up to 8 hours without having to
urinate, but some may need to get up once during the night — one episode
is still considered within normal limits. Individuals with nocturia may
get up 2–6 times during the night.

Nocturia may be a sign of other health conditions, including bladder
prolapse, a tumour of the bladder or prostate, and other disorders
affecting sphincter control. Pregnant women and people with heart or
liver failure and diabetes may also experience nocturia.

As we get older, our bodies produce less of an antidiuretic hormone
that enables us to retain fluid — this leads to more urine production
during the night. Older adults also tend to lose holding capacity and
are more likely to have medical issues that impact the bladder.

According to a 2003 poll from the National Sleep Foundation,
approximately two-thirds of responders, who were between the ages of 55
and 84, reported that they experienced nocturia at least a few nights
per week.

A team of researchers presented the results of their recent study at
the 83rd Annual Scientific Meeting of the Japanese Circulation Society.
According to their findings, trips to the toilet to urinate at night may
be linked to excessive salt intake and high blood pressure.

“Our study indicates that if you need to urinate in the night —
called nocturia — you may have elevated blood pressure and/or excess
fluid in your body,” says study author Dr. Satoshi Konno, of the
Division of Hypertension at the Tohoku Rosai Hospital in Sendai, Japan.

Previous research showed that excessive daily salt intake and
hypertension have a negative impact on nocturia. In Japan, people
generally consume significantly more salt than those in Western
countries, and for this reason, the Japanese population may be at higher
risk of developing high blood pressure.

Though people in other countries tend to have different eating habits
when it comes to salt, the results of these studies suggest that
appropriate control of salt intake and blood pressure might be important
for the treatment of nocturia, regardless of nationality.

The researchers enrolled 3,749 residents of the town of Watari who
had undergone an annual health check in 2017 and gathered information
about their blood pressure levels and nocturia using questionnaires.

The data showed that getting up in the night to urinate was
associated with a 40 percent greater chance of having high blood
pressure, and the risk of hypertension rose significantly as the number
of nocturia events per night increased.

Dr. Konno says that the results do not prove a causal relationship
between nocturia and hypertension, and they may not apply to people who
live outside Japan.

“The relationship may be influenced by various factors including
lifestyle, salt intake, ethnicity, and genetic background,” the
researcher explains.

“Hypertension is a national disease in Japan. The average salt intake
in Japan is approximately 10 grams per day, which is more than double
the average salt intake worldwide (4 grams per day). This excessive salt
intake is related to our preference for seafood and soy sauce-based
food, so salt restriction is difficult to carry out,” says Dr. Mutsuo
Harada, the conference’s press coordinator.

Dr. Harada adds that early detection and management of hypertension
are crucial to prevent heart disease. It is important to research and
understand the cause of nocturia in patients because this disorder can
not only result from urinary organ problems — it may also be caused by
diseases such as hypertension.

Professor and president of the European Society of Cardiology (ESC)
Barbara Casadei notes: “More than 1 billion people have high blood
pressure, worldwide. High blood pressure is the leading global cause of
premature death, accounting for almost 10 million deaths in 2015. ESC
guidelines recommend medication to reduce the risk of stroke and heart
disease.”

“A healthy lifestyle is also advised, including salt restriction,
alcohol moderation, healthy eating, regular exercise, weight control,
and smoking cessation,” she adds.

*Medical News Today