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New research suggests that simple switch may normalise patterns of blood pressure in patients at risk from the twin epidemics of heart and kidney disease.
Why? When it comes to blood pressure, you want to be a dipper. In healthy people, blood pressure dips at night, by 10 to 20 percent.
Scientists do not know why, but suspect the drop gives arteries a little rest.
Hypertension fuels heart disease
People with high blood pressure that does not dip at night - the
non-dippers - fare worse than other hypertension sufferers, developing
more serious heart disease. Moreover, heart and kidney disease fuel
each other - and the 26 million Americans with chronic kidney disease
seem most prone to non-dipping. In addition to heart problems, they are
at extra risk of their kidney damage worsening to the point of
dialysis.
Most blood pressure patients need two or three medications. So Italian researchers performed an easy test: They told 32 non-dippers with kidney disease to switch one of those drugs from a morning to a bedtime dose. In two months, nearly 90 percent of these high-risk patients had turned into dippers. Their night time blood pressure dropped an average of seven points, without side effects or increase in daytime blood pressure.
Better, a key sign of kidney function improved significantly, too, Dr Roberto Minutolo of the Second University of Naples reports this month in the American Journal of Kidney Diseases.
It's the latest research in the field of chronotherapy: How our bodies' internal rhythms make certain diseases worse at certain times of the day, and in turn affect how to time treatments.
How big a problem is non-dipping?
"I think it's huge," says Hopkins' Dr Lawrence Appel. "This is our
best lead" into why black Americans with kidney disease, in particular,
tend to worsen despite treatment.
Appel found 80 percent of black kidney patients in a recent study were non-dippers. Most startling, 40 percent had night time blood pressure that was even higher than daytime levels.
Two-thirds of chronic kidney disease patients, and at least 10 percent of the general population, are estimated to be non-dippers, says Dr Joseph Vassalotti of the National Kidney Foundation. One theory is that their bodies have trouble excreting salt.
Yet few patients have ever heard of the problem - and few doctors know who is affected. Most people get their blood pressure checked only during the day. A 24-hour blood pressure monitor can tell but is rarely used, partly because insurance seldom pays for the extra visit to download and diagnose the readings.
Pills wear off by night time
And most patients who take several once-a-day pills swallow them all
in the morning, meaning they all start wearing off around the same
time, says Dr Gina Lundberg of St. Joseph's Hospital in Atlanta.
"It does make good sense to take some in the morning and some in the evening," says Lundberg, a spokeswoman for the American Heart Association.
Everyone has an internal clock, determined by genes, that affects health. Many of these biological rhythms are circadian, meaning they fluctuate on a 24-hour cycle.
Consider how that can affect the timing of treatments. Some older "statin" pills fight cholesterol best if taken at bedtime; they target a liver enzyme that's most active at night. Asthma attacks are more frequent at night, and the stomach secretes more heartburn-causing acid at night, affecting some patients' dosing requirements. Researchers even are studying how to better time certain cancer chemotherapies and allergy treatments.
The best-known example: Blood pressure jumps in the early morning hours, as the awakening body produces more stress hormones. That is also why heart attacks and strokes are most common in the morning.
The night time dipping problem has gotten far less attention. The new Italian study marks an important advance, says Dr Mahboob Rahman of the University Hospitals of Cleveland.
"We know now that you can change medication timing and lower blood pressure at night," he explains.
That does not mean everyone should switch to bedtime dosing. Morning may be best for people on just one drug, and no one yet knows if the switch truly gives non-dippers better overall health. "That's the million-dollar question," Rahman cautions. – (Lauran Neergaard/Sapa)
Read more:
High BP ups diabetes risk
Hypertension Centre
December 2007
