Methods Are Many to Reduce Blood Pressure
By: Jane E. Brody
NY Times, July 2, 2002
Three decades after the National High Blood Pressure Education Program
started saying that controlling high blood pressure saves lives, rates of
hypertension are rising.
In addition, the proportion of patients being treated — or treated
well enough to bring their blood pressure readings under control — is
falling, creating waves of alarm among cardiovascular specialists.
As a result, stroke rates are going up and the decline in heart attacks
has leveled off; both strokes and heart attacks are directly linked to
uncontrolled hypertension.
In trying to account for these changes, experts point to a number of
factors. One is the sharp increase in the percentage of Americans who are
overweight or obese, creating for themselves the leading risk factor for
hypertension.
Another is a basic quality of the condition: it is a silent disease,
and a vast majority of people with it feel fine, even as it causes
life-threatening or fatal damage. About 30 percent of people with
hypertension don't know they have it.
A third factor is the unwillingness or inability of most people with
high blood pressure to change their diets and try exercise and relaxation
techniques that can bring their readings down to normal.
Fourth is the reluctance of many patients to take medications and the
failure of many doctors to keep up with drug developments that would allow
them to design individual treatments and prescribe the remedies likely to
produce the most benefit with the fewest side effects.
Further complicating the picture are the insurance-dictated constraints
on doctors. Many of them don't take the time to educate patients about the
importance of continually monitoring their pressure readings.
Last but hardly least, the drug companies with the greatest financial
interest in getting all people with hypertension into treatment may have
had a detrimental effect on the acceptance of drug therapy.
At the expense of older, less expensive drugs, pharmaceutical companies
have heavily promoted newer and more expensive medications that may not
always be the best for a particular patient. These may also be too costly
for many older patients, who, since Medicare does not pay for drugs, have
been known to take half the prescribed dosages to stay within their
budget.
Tailoring Treatment
There are six classes of medications and scores of different drugs and
drug combinations that are tailored to control high blood pressure.
Which drug or drug combination is right is determined by factors like
sex, age, systolic blood pressure (the higher number, representing the
pressure on arteries when the heart beats), smoking habits, total
cholesterol, level of protective H.D.L. cholesterol, and whether the
patient has diabetes or an enlarged left ventricle, the heart's main
pumping chamber.
The simplest remedy that achieves the desired goal is the best choice.
For example, say most experts, among them Dr. Steven A. Dosh of Escanaba,
Mich., patients who have no known underlying disease are best treated
initially with diuretics, which bring blood pressure down by reducing the
volume of fluid the heart has to pump to outlying tissues. Diuretics in
low doses are well tolerated, safe, effective and cheap and need be taken
only once a day.
But, as Dr. Dosh wrote recently in The Journal of Family Practice, for
those who have already had a heart attack or are otherwise known to have
coronary artery disease, beta-blockers, which slow the heart and reduce
the force of its contractions, may be the initial drug of choice. When
combined with a diuretic, beta-blockers were proved to be especially good
at preventing strokes, though less effective than expected in preventing
heart attacks, according to Dr. Michael Alderman, a hypertension
specialist at Albert Einstein Medical Center in the Bronx.
But one newer, more expensive drug may be better for some patients. For
example, for patients with diabetes or systolic hypertension after a heart
attack, the best remedy may be ACE, or angiotensin-converting enzyme,
inhibitors. They relax blood vessels by reducing production of angiotensin
I, which is converted into angiotensin II, a hormone that constricts
arteries.
If an ACE inhibitor's side effects — a cough and a rash — are
troublesome, a patient could try an A.R.B, or angiotensin receptor
blocker, which prevents the action of angiotensin II. Thus far, the
A.R.B.'s appear to be more effective than beta-blockers in preventing
strokes, though the drugs are equally effective in reducing blood
pressure, Dr. Alderman said.
The other classes are vasodilators, which relax blood vessels, and
calcium channel blockers, which also relax blood vessels but in a number
of studies have been linked to an increased risk of cardiovascular
disease, especially congestive heart failure. However, studies have also
indicated that long-acting calcium channel blockers may be more effective
at preventing strokes than the ACE inhibitors, Dr. Alderman said.
So far, neither the ACE inhibitors nor the calcium channel blockers
have been shown to be better than diuretics in preventing heart attacks,
he added.
What Should a Patient Do?
First, don't do what one woman in her 50's did. Having experienced
swollen ankles and a rapid heart beat as a side effect of a calcium
channel blocker prescribed for hypertension, she stopped taking the drug
and never returned to the doctor.
All drugs have side effects, a fact especially troublesome for blood
pressure treatment, since the disorder itself usually produces no
symptoms. Diuretics in high doses force patients to the bathroom many
extra times a day and several times a night.
Many diuretics also deplete the body of potassium and magnesium and may
raise blood levels of cholesterol and glucose. Beta-blockers in full dose
can make people groggy, slow the heart rate and cause bronchial spasms.
Vasodilators can cause headaches, fluid retention and rapid heart rate.
ACE inhibitors commonly cause an annoying dry cough, whereas the A.R.B.'s,
which are generally better tolerated, may cause high blood levels of
potassium. And nearly all the antihypertensive medications can inhibit
sexual function, particularly in men.
Dr. Alderman suggested that in many patients, the ideal treatment is a
combination of low doses of two or more drugs. This has the advantage of
limiting the likelihood of disturbing side effects while increasing the
drugs' effectiveness.
Patients should be closely monitored in the first months of treatment
and every six months afterward; if the treatment is or becomes
ineffective, it must be changed, by increasing the dose or changing drugs.
Home blood pressure monitoring can alert patients to the need to see a
doctor.
And for any drug treatment to work optimally, otherwise healthy
patients should also adopt protective habits, including eating diets rich
in fruits, vegetables and low-fat dairy products and low in fat and salt
and other sources of sodium.
Aerobic exercise for at least 45 minutes a day three times a week is
highly recommended. And, if the patient is overweight, a loss of 10
percent of total body weight can be very beneficial. Relaxation exercises
like meditation may also help
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