Why the pulse pressure difference narrows significantly in the early stages of shock

First, the amount of blood returning to the heart decreases during shock, the blood and stroke volume that pop out of the heart decreases, and the systolic blood pressure decreases.

Lowers diastolic blood pressure.

Little change, resulting in a decrease in pulse pressure difference; In addition, the heart rate increases during shock, the diastolic ejection time decreases, the residual blood volume of the end-diastolic artery increases, the diastolic blood pressure increases, and the fixed pulse pressure difference decreases.

In the early stages of shock, the amount of blood returning to the heart decreases, while the peripheral resistance increases, resulting in unchanged or decreased systolic blood pressure; Due to the positive heart rate effect of the sympathetic nerve, the heart rate increases, the pulse is thin, the diastolic ejection time decreases, the residual blood volume at the end of diastole increases, and the diastolic blood pressure increases. As a result, pulse pressure decreases.

These include neural mechanisms and humoral mechanisms.

1.Nervous mechanism: All kinds of shock** can excite the sympathetic nervous system.

2.Humour mechanism: The sympatheto-adrenal medullary system is excited, releasing a large amount of CA - making the abdominal organs and renal blood vessels constrict, but it has little effect on the cardiovascular and cerebrovascular vessels.

Its effects are 1, the heart rate increases, the cardiac contraction force increases, the peripheral resistance increases--- so the pulse counts, and the pulse pressure decreases. 2. The small blood vessels in the abdominal cavity constrict--- urine output decreases, and the anal temperature decreases. 3. Increased sweat gland secretion --- sweating.

4. ** vasoconstriction--- pale complexion, cold limbs. 5. The central higher parts are excited--- so they are irritable. The body also secretes other vasoconstrictor factors that synergistically participate in this process.

It's not very clear, I hope you can understand it.

Response: Shock is classified as early, intermediate, and late. In the early stage of shock, the body is in a compensatory state, and the clinical manifestations can be manifested as the patient's mental tension or irritability, anxiety, easy excitability, clear consciousness, paleness, mild cyanosis of the lips and nail beds, clammy and cold limbs, increased heart rate, shortness of breath, fine pulse, normal or low systolic blood pressure, slightly increased diastolic blood pressure, decreased urine output, and some patients can have warm shock characteristics such as warm limbs and sweating.

Hello The common small pulse pressure difference is mostly caused by a decrease in systolic blood pressure (high pressure), which has both physiological and pathological causes. The former is a common type of weight loss or weakness in systolic blood pressure, and the latter is seen in shock, myocardial infarction, cardiac insufficiency, cardiac tamponade, adrenal insufficiency and other diseases. Other organic lesions that cause a decrease in pulse pressure difference include pericardial effusion, constrictive pericarditis, severe mitral stenosis, and aortic stenosis.

Therefore, when the pulse pressure difference is found to be significantly reduced, various organic lesions should be excluded first, such as after a detailed examination, when no clear ** is found, it should be considered as a constitutional blood pressure reduction (mainly refers to systolic blood pressure), ** constitutional hypotension, in addition to enhancing physical strength, properly strengthening nutrition, but also to prevent dizziness or fall when standing upright. Drugs can be used to regulate autonomic nerve function, gamma oryzanol, vitamins, etc. Hello The common small pulse pressure difference is mostly caused by a decrease in systolic blood pressure (high pressure), which has both physiological and pathological causes.

The former is a common type of weight loss or weakness in systolic blood pressure, and the latter is seen in shock, myocardial infarction, cardiac insufficiency, cardiac tamponade, adrenal insufficiency and other diseases. Other organic lesions that cause a decrease in pulse pressure difference include pericardial effusion, constrictive pericarditis, severe mitral stenosis, and aortic stenosis. Therefore, when the pulse pressure difference is found to be significantly reduced, various organic lesions should be excluded first, such as after a detailed examination, when no clear ** is found, it should be considered as a constitutional blood pressure reduction (mainly refers to systolic blood pressure), ** constitutional hypotension, in addition to enhancing physical strength, properly strengthening nutrition, but also to prevent dizziness or fall when standing upright.

Drugs can be used to regulate autonomic nerve function, gamma oryzanol, vitamins, etc.

The pulse pressure difference is small. There are physiological factors to this.

For example, a decrease in systolic blood pressure is usually more common in people who are emaciated or weak, and there are also pathological causes.

Such as shock, myocardial infarction, cardiac insufficiency, cardiac tamponade, adrenal insufficiency, pericardial effusion, constrictive pericarditis, severe second-class valve stenosis, aortic stenosis, etc.

Therefore. A significant decrease in pulse pressure difference was found. Various organic lesions should be excluded first, and if a clear ** is not found after a detailed examination, it should be considered as a constitutional decrease in blood pressure (mainly systolic blood pressure). **Constitutional hypotension.

In addition to enhancing physical strength and nutrition, it is also necessary to prevent dizziness and fall injuries when standing upright.

The decrease in pulse pressure difference is more common in patients in the early stage of hypertension, due to the increased excitability of sympathetic nerves, peripheral vascular spasm, consistent systolic blood pressure is not high, and diastolic blood pressure is relatively high, so the pulse pressure is reduced, and the phenomenon of small pulse pressure difference without discomfort does not need to be too mindful, because it will not have much impact on health.

The current condition is hemorrhagic shock, and the early manifestations are hypovolemia, but cardiac reimbursement is acceptable, and continued hydration should be considered**.