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Factors Increasing The Blood Pressure





Category: Uncategorized
Source: Disturbances Of The Heart

With normal heart and arteries, exertion and exercise should
increase the systolic pressure, and generally somewhat increase the
diastolic pressure. The pressure pulse should therefore be greater.
When there is circulatory defect or abnormal blood pressure,
exercise may not increase the systolic pressure, and the pressure
pulse may grow smaller. As a working rule it should be noted that
the diastolic pressure is not as much influenced by physiologic
factors or the varying conditions of normal life as is the systolic
pressure.

In an irregularly acting heart the systolic pressure may vary
greatly, from 10 to 20 mm. or more, and a ventricular contraction
may not be of sufficient power to open the semilunar valves. Such
beats will show an intermittency in the blood pressure reading as
well as in the radial pulse. The succeeding heart beats after
abortive beats or after a contraction of less power have increased
force, and consequently give the highest blood pressure. Kilgore
urges that these highest pressures should not be taken as the true
systolic blood pressure, but the average of a series of these
varying blood pressures. In irregularly acting hearts it is best to
compress the arm at a point above which the systolic pressure is
heard, then gradually reduce the pressure until the first systolic
pressure is recorded, and then keep the pressure of the cuff at this
point and record the number of beats of the heart which are heard
during the minute. Then reduce the pressure 5 mm. and read again for
a minute, and so on down the scale until the varying systolic
pressures are recorded. The average of these pressures should be
read as the true systolic blood pressure. During an intermittency of
the pulse from a weak or intermittently acting ventricle, the
diastolic pressure will reach its lowest point, and in auricular
fibrillation the pressure pulse from the highest systolic to the
lowest diastolic may be very great.

In arteriosclerosis the systolic may be high, and the diastolic low,
and hence a large pressure pulse. When the heart begins to fail in
this condition, the systolic pressure drops and the pressure pulse
shortens, and of course any improvement in this condition will be
shown by an increase in the systolic pressure. The same is true with
aortic regurgitation and a high systolic pressure.

If the systolic pressure is low and the diastolic very low, or when
the heart is rapid, circulation through the coronary vessels of the
heart is more or less imperfect. Any increase in arterial pressure
will therefore help the coronary circulation. The compression of a
tight bandage around the abdomen, or the infusion of blood or saline
solutions, especially when combined with minute amounts of
epinephrin, will raise the blood pressure and increase the coronary
circulation and therefore the nutrition of the heart.

MacKenzie [Footnote: MacKenzie: Med Rec., New York, Dec. 18, 1915.],
from a large number of insurance examinations in normal subjects,
finds that for each increase of 5 pulse beats the pressure rises 1
mm. He also finds that the effect of height on blood pressure in
adults seems to be negligible. On the other hand, it is now
generally proved that persons with overweight have a systolic
pressure greater than is normal for individuals of the same age. He
believes that diastolic pressure may range anywhere from 60 mm. of
mercury to 105, and the person still be normal. A figure much below
60 certainly shows dangerous loss of pressure, and one far below
this, except in profound heart weakness, is almost pathognomonic of
aortic regurgitation. While the systolic range from youth to over 60
years of age gradually increases, at the younger age anything below
105 mm. of mercury should be considered abnormally low, and although
150 mm. at anything over 40 has been considered a safe blood
pressure as long as the diastolic was below 105, such pressures are
certainly a subject for investigation, and if the systolic pressure
is persistently above 150, insurance companies dislike to take the
risk. However, it should be again urged in making insurance
examinations that psychic disturbance or mental tensity very readily
raises the systolic pressure. MacKenzie believes that a diastolic
pressure over 100 under the age of 40 is abnormal, and anything over
the 110 mark above that age is certainly abnormal.

It has been shown, notably by Barach and Marks, [Footnote: Barach,
J. H., and Marks, W. L.: Effect of Change of Posture--Without Active
Muscular Exertion--on the Arterial and Venous Pressures, Arch. Int.
Med., May, 1913, p 485.] that posture changes the blood pressure.
When a normal person reclines, with the muscular system relaxed,
there is an increase in the systolic pressure and a decrease in the
diastolic pressure, with an increase in the pressure pulse from the
figures found when the person is standing. When, after some minutes
of repose, he assumes the erect posture again, the systolic pressure
will diminish and the diastolic pressure increase, and the pressure
pulse shortens.

Excitement can raise the blood pressure from 20 to 30 mm., and if
such excitement occurs in high tension cases there is often a
systolic blow in the second intercostal space at the right of the
sternum. This may not be due to narrowing of the aortic orifice; it
may be due to a sclerosis of the aorta. On the other hand, it may be
due entirely to the hastened blood stream from the nervous
excitability. This is probably the case if this sound disappears
when the patient reclines. If it increases when the heart becomes
slower and the patient is lying down, the cause is probably organic.

This psychic influence on blood pressure is stated by Maloney and
Sorapure [Footnote: Maloney and Sorapure: New York Med. Jour., May
23, 1914, p. 1021.] "to be greater than that from posture, than that
arising from carbonic acid gas control of the blood, than that
arising from mechanical action of deep breathing upon the
circulation, and than that arising from removal of spasm from the
musculature."

Weysse and Lutz [Footnote: Weysse and Lutz: Am. Jour. Physiol., May,
1915.] find that the systolic pressure varies during the day in
normal persons, and is increased by the taking of food, on an
average of 8 mm. The diastolic pressure is not much affected by
food. This increased systolic pressure is the greatest about half an
hour after a meal, and then gradually declines until the next meal.

Any active, hustling man, or a man under strain, has a rise of blood
pressure during that strain, especially notable with surgeons during
operation, or with brokers or persons under high nervous tension.
Daland [Footnote: Daland: Pennsylvania Med Jour., July, 1913.]
states that a man driving an automobile through a crowded street may
have an increase of systolic pressure of 30 mm., and an increase of
15 mm. in his diastolic pressure, while the same man driving through
the country where there is little traffic will increase but 10 mm.
systolic and 5 mm. diastolic. Fear always increases the blood
pressure. This is probably largely due to the peripheral
contractions of the blood vessels and nervous chilling of the body.





Next: Venous Pressure

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