RU2410016C1 - Method of blood pressure measurement - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: pressure is measured by external artery compression. Systolic C₁, C₂ and diastolic D₁, D₂ pressures are recorded in two points. It is followed with calculating arithmetical mean pressures

and

, pulse pressure divided by 2 - P_p1 and P_p2. Table correction factor of the arithmetic mean values ΔP_tabl, as well as P_p1 and P_p2 - ΔP_Ptabl are derived. To determine the one-point systolic and diastolic pressures, arithmetic mean and pulse pressure divided by 2 is measured in the other point with considering the related correction factors which are added or subtracted respectively. The calculation is maintained by original formulae.

EFFECT: more precise determination of blood pressure.

2 ex

Description

The invention relates to medicine and can be used in practice of measuring blood pressure using digital pressure measuring instruments, for example, with cuffs on the shoulder and wrist.

A known method of measuring blood pressure (Patent RU No. 2013991, A61B 5/02, publ. 06/15/94, bull. No. 11), according to which the parameters of the sphygmogram and blood pressure are recorded in the area of the finger arteries of the hand and calibrated twice - at rest and when altered blood pressure (during physical or emotional stress), then determine the amplitude of each complex of the sphygmogram in both parts and average it for each record, after which the pulse, diastolic and systolic pressure in the operating mode are determined.

However, there are some difficulties in determining blood pressure:

1) determination of blood pressure by the parameters of the sphygmogram, which is difficult to carry out in everyday life;

2) the registration of indications is carried out on the index finger of the left hand, which can only be done in clinical conditions.

A known method of determining blood pressure (Copyright certificate SU No. 1804785, A61B 5/02, publ. 30.03.93, bull. No. 12), in which by applying to the limb of the pulse conversion sensor determine the duration of systole and diastole, set the number of voltage readouts for period of systole and diastole and evaluate the maximum pulse voltage in the individual discrete systole and diastole and determine the systolic and diastolic pressure.

Here, blood pressure is determined by the energy characteristics of the pulse of the radial artery of the hand using a sensor converting the pulse into an electrical signal. In this case, systolic and diastolic pressure is determined through the duration of systole and diastole, which is difficult to achieve in everyday life, while this method of measuring pressure is only possible using the appropriate pulse conversion sensor.

The closest in technical essence is a method for determining blood pressure according to patent RU No.2003278, АВВ 5/02, publ. 11/30/93, bull. No. 43-44, which consists in the fact that blood pressure is measured at two control points, on the brachial and femoral arteries, and form a correction factor, defined as the true (lateral) pressure.

The method is implemented as follows. A compression cuff is placed on the middle third of the shoulder, air is pumped into it, after which the pressure in the cuff is gradually reduced and the pressure in the cuff is auscultated. Blood pressure is determined by the pressure gauge. Similarly, systolic and diastolic pressures on the thigh are measured. The cuff is placed on the middle third of the thigh in the position of the subject lying on his stomach. Auscultation is performed in the popliteal fossa above the popliteal artery. Blood pressure on the shoulder and thigh is measured on one side of the body. Next, measure the distance from the jugular notch to the proximal end of the cuff on the shoulder and thigh along the arterial vessels. When measuring the pressure on the shoulder, the distance from the jugular notch to the place of application of the cuff is measured along the arm extended horizontally and somewhat backward. When measuring the pressure on the thigh, the distance from the jugular notch to the place of application of the cuff is measured in the position of the subject lying on his back along the projection of the arteries.

True (lateral) pressure is determined by the formula:

where P is true (lateral pressure);

P ₁ - maximum systolic pressure on the shoulder;

P ₂ - maximum systolic pressure on the thigh;

P ₃ - diastolic pressure on the shoulder;

P ₄ - diastolic pressure on the thigh;

B is the distance from the jugular notch to the proximal end of the cuff superimposed on the thigh;

P is the distance from the jugular notch to the proximal end of the cuff superimposed on the shoulder.

However, this method is difficult to implement, time-consuming in the calculations and can be used only in stationary conditions, since all measurements are difficult to perform independently.

The present invention is aimed at simplifying the method for determining blood pressure.

The technical result to which the claimed invention is directed is to determine systolic and diastolic pressures at one point with a known value of systolic and diastolic pressures at another point, taking into account the values of the correction factors.

и

, пульсовые давления, деленные на 2 - Р_п1 и Р_п2 формируют поправочные коэффициенты среднеарифметических ΔР_попр и пульсовых давлений

исходя из следующих соотношений:The technical result is achieved by the fact that in the method for determining blood pressure by periodically compressing the arteries with external pressure, according to which systolic C ₁ , C ₂ and diastolic D ₁ , D ₂ pressures are determined at two points, the new is that the arithmetic mean pressure is determined

and

, Pulse pressure, divided by 2 - P _n1 and P _n2 shape correction coefficients? P _SOCA arithmetic mean and the pulse pressure

based on the following ratios:

ΔРп_попр=Р_п1-Р_п2,

ΔRp _{SOCA p1-} P = P _n2

Where

and to determine systolic and diastolic pressures at one point, the arithmetic mean and pulse pressure, divided by 2, at another point, which are changed by the value of the corresponding correction factors, respectively adding them or subtracting:

This method is implemented as follows.

When forming correction factors when measuring blood pressure at two points, proceed from the following. Systolic and diastolic pressures are measured at the first point, for example, on the brachial artery. To do this, put a compression cuff on the upper third of the shoulder of the left hand and pump air, after which the pressure in the cuff is gradually reduced and systolic and diastolic pressures are measured.

Similarly, systolic and diastolic pressures are measured at a second point, for example on the wrist. The cuff is put on the wrist, while the device should be at the level of the heart (put the left hand on the right shoulder). The readings of the second device are recorded.

Find the arithmetic mean and pulse pressure, divided by 2, when measured at two points:

,

,

,

- средние арифметические давления при измерении в двух точках;Where

,

- arithmetic mean pressure when measured at two points;

P _p1 P _p2 - pulse pressure divided by 2, when measured at two points;

C ₁ , C ₂ - systolic pressure at two points;

D ₁ , D ₂ - diastolic pressure at two points.

The formation of correction factors for arithmetic mean and pulse pressures is carried out according to the formulas:

where _{ΔР popr} - correction factor of arithmetic mean pressures.

- поправочный коэффициент пульсовых давлений.Where

- correction factor of pulse pressure.

Systolic and diastolic pressure at one point in this method is carried out in the following sequence:

и пульсовое давления, деленное на 2, - Р_п2 при измеренном систолическом и диастолическом давлениях в другой точке, например во второй точке:1. Find the arithmetic mean

and pulse pressure divided by 2, - R _p2 at measured systolic and diastolic pressures at another point, for example at the second point:

и пульсовое давление, деленное на 2, - Р_п1 в первой точке с учетом поправочных коэффициентов ΔР_попр и

:2. Determine the arithmetic mean

and pulse pressure divided by 2, - P _p1 at the first point, taking into account the correction factors _{ΔР prob} and

:

3. Determine the systolic C ₁ and diastolic D ₁ pressure at the first point, changing it by the value of the pulse pressure divided by 2, - P _p1 at this point:

и пульсовое давление, деленное на 2, - Р_п2 в другой точке с учетом соответствующих поправочных коэффициентов ΔР_попр и

, которые затем соответственно складываются или вычитаются:Thus, to determine the systolic C ₁ and diastolic D ₁ pressure at the first point, the arithmetic mean

and pulse pressure divided by 2, - Р _п2 at another point, taking into account the corresponding correction factors _ΔР

which are then added or subtracted accordingly:

In a similar way, systolic and diastolic pressures can be determined at the second point using the following relationships:

Example 1. Readings of systolic and diastolic pressures at two points, for example, on the shoulder and on the wrist: blood pressure on the shoulder 154/62 mm Hg, wrist 152/82 mm Hg Define the correction coefficients of the arithmetic mean and pulse pressure when measured at these points.

The arithmetic mean pressure when measured on the shoulder will be:

where C ₁ , D ₁ - systolic and diastolic pressure on the shoulder.

Arithmetic mean pressure when measured on the wrist:

where C ₂ , D ₂ - systolic and diastolic pressure on the wrist.

Pulse pressure divided by 2 when measured on the shoulder:

Pulse pressure divided by 2 when measured on the wrist:

Arithmetic mean pressure correction value:

Pulse pressure correction value:

при измерении в двух точках.Thus, correction coefficients _ΔР

when measured at two points.

The calculation of systolic and diastolic pressures by the proposed method will show the following example.

Example 2. The result of measuring blood pressure on the wrist is 152/82 mm Hg Determine the systolic and diastolic pressures when measuring on the shoulder, if the known values of the corrections of the arithmetic mean and pulse pressure _{ΔР sppr} = 11 mm Hg and

Define systolic and diastolic pressure when measured on the shoulder according to the formulas:

those. the desired pressure when measured on the brachial artery will be 154/62 mm Hg

Example 3. The result of measuring blood pressure on the shoulder is 154/62 mm RT.article. We will recalculate the readings when measuring blood pressure on the wrist, if the values of the corrections of the arithmetic mean and pulse pressure are _{known ΔР prob} = -9 mm Hg and

We find systolic and diastolic pressures when measured on the wrist, i.e. at the second point:

those. the desired pressure when measured on the wrist will be 152/82 mm Hg

Thus, the proposed method allows to determine the systolic and diastolic pressures at one point with a known value of systolic and diastolic pressures at another point, taking into account correction factors obtained by a comparative analysis of the readings for pressure measurements at these points.

Claims (1)

The method of determining blood pressure by periodic compression of the arteries with external pressure, which measure systolic C ₁ , C ₂ and diastolic D ₁ , D ₂ pressure values at two points, characterized in that the arithmetic mean pressure is determined

and

, pulse pressures divided by 2 - P _p1 and P _p2 and form the correction coefficients of the arithmetic mean ΔP _pop and pulse pressure ΔPp _pop , based on the following relationships:

_SOCA ΔP = P -P _{n1, n2,}
Where

,
and to determine systolic and diastolic pressures at one point, the arithmetic mean and pulse pressure, divided by 2, at another point, which are changed by the values of the corresponding correction factors, respectively adding or subtracting them