|
CUFF size is
IMPORTANT
It is extremely important to make
sure you use the correct size of blood pressure cuff. Using a
regular cuff on an obese person has been found to artificially
inflate blood pressure dramatically. Not using the
correct cuff on yourself, you are lying to yourself about what
your blood pressure actually is. It is highly important
that this number be accurate.
Unfortunately, using the wrong size blood
pressure cuff ("miscuffing") is incredibly common. Iyriboz et
al. (1994) states:
Using an inappropriate cuff---the most
common error in indirect BP measurement---can significantly
distort BP (blood pressure) readings. This error probably is due to the
failure in common practice to measure arm circumference
prior to BP measurement. Considering the other common
errors committed during BP measurement, together with using
the wrong cuff, incorrect measurement of BP is very common.
It is important that women of size know what
cuff size they should use, check to see that the proper cuff is
being used EVERY TIME you check your blood pressure.
What is My Cuff Size?
Women who are close to average size should be
fine with a regular cuff, but most "overweight" people should
use a large cuff. However, a lot depends on your arm size.
Women with larger arms need the bigger cuffs; if your arms are
relatively small you may not need a larger cuff. If you have
very heavy arms, you may need a cuff size even bigger than
"large."
To know whether you need a larger cuff,
measure the circumference of your upper arm. Even if you are
sure which size cuff you should use, it is good to know exactly
what your arm measures so that if there is ever any question,
you'll be able to know which cuff is most appropriate for YOU.
To determine your arm size,
measure around the center of the upper arm. You may need
someone else's assistance to measure accurately. Be sure to know
your arm circumference in both inches and centimeters.
Most guidelines are published in centimeters (this is the
standard measurement around most of the world.) If you only
know your measurement in inches, you won't be able to figure out
which cuff is best for you, since most guidelines printed on BP
cuffs are in centimeters. Compare your results to the chart
found below.
| inches |
11.4" |
12.2" |
13" |
13.7" |
15.7" |
16" |
17" |
17.3" |
17.7" |
18.5" |
19.6" |
20.4" |
|
centimeters |
29 cm |
31 cm |
33 cm |
35 cm |
40 cm |
41 cm |
43 cm |
44 cm |
45 cm |
47 cm |
50 cm |
52 cm |
Not everyone agrees when a larger
cuff is needed. The most common rule is that if the arm
circumference is greater than 13 inches (33 cm) or so, a larger
cuff size is definitely needed.
For example, the American Association of
Family Physicians (AAFP) states:
Accurate
measurement of blood pressure requires special
consideration. A standard-sized blood pressure cuff should
not be used on persons with an upper-arm circumference of
more than 34 cm [Kmom note: just over 13 inches]. Large arm
cuffs or thigh cuffs can aid in an accurate determination of
blood pressure.
If you are borderline in size,
have your blood pressure taken with both a regular and a larger
cuff; if the two numbers are differ very much, the pressure
taken on the larger cuff is the valid one, from then one use the
larger cuff.
Some medical personnel will tell
you that if the cuff can go around your arm, it is an
appropriate size for you. NOT TRUE!! It is NOT whether
the cuff will go around your arm, it is whether the
inflatable "bladder" inside the cuff is the appropriate length
and width for your arm size. A cuff can go around your arm
just fine and still have the wrong-sized "bladder" inside the
cuff.
Research is VERY clear that
measuring blood pressure with a cuff bladder that is the wrong
size artificially alters the blood pressure result. Fit is NOT
the correct criteria for whether you are using the
appropriately-sized cuff. Length and width of bladder is. |