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Alterations in Blood Pressure

Alterations in Blood Pressure

Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
Hypertension (High blood pressure)
Hypertension occurs when blood pressure readings consistently exceed the normal range. It is diagnosed when systolic blood pressure (the top number, indicating pressure while the heart...

Blood Pressure Imbalances and Circulatory Shock

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Disorders of the Autonomic Nervous System

Disorders of the Autonomic Nervous System

The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
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Measurement of Blood Pressure

Measurement of Blood Pressure

Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a...

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When assessing blood pressure (BP), healthcare professionals must consider various factors and potential unexpected outcomes to ensure accurate readings and provide proper patient care. Adhering to these guidelines is essential to achieving the most reliable results.
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Antihypertensive Drugs: Potassium-Sparing Diuretics

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Related Experiment Video

Updated: Mar 31, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

Published on: March 21, 2013

Seated postural hypotension.

Oleg Gorelik¹, Natan Cohen¹

¹Department of Internal Medicine "F", Assaf Harofeh Medical Center (affiliated to the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel), Zerifin, Israel.

Journal of the American Society of Hypertension : JASH

|October 31, 2015

Summary

Seated postural hypotension (PH), a drop in blood pressure when sitting, is common, especially in elderly patients. Nonpharmacologic interventions can help prevent symptoms and falls.

Keywords:

Orthostatic hypotension seating sitting

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Last Updated: Mar 31, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

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Published on: July 19, 2011

Area of Science:

Cardiology
Geriatrics
Neurology

Background:

Most research on postural hypotension (PH) focuses on standing.
Seated PH, occurring after transitioning from lying to sitting, is less understood and not previously reviewed in English literature.

Purpose of the Study:

To provide current information on seating-induced PH.
To review prevalence, evaluation, symptoms, risk factors, prognosis, and management of seated PH.

Main Methods:

A systematic review of seventeen studies on seated PH.
Analysis of data on prevalence, manifestations, predisposing factors, prognosis, and management.

Main Results:

Prevalence of seated PH varies from 8% in community-dwelling individuals to 56% in elderly hospitalized patients.
Common symptoms include dizziness and palpitations.
Key predisposing factors identified are aging, bed rest, and hypertension.

Conclusions:

Seated PH is a common, diagnosable, and symptomatic condition, particularly in elderly inpatients.
Nonpharmacologic interventions can largely prevent blood pressure drops and associated symptoms from seating.