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Related Concept Videos

Measurement of Blood Pressure01:17

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 stethoscope.
Special considerations while measuring blood pressure01:28

Special considerations while measuring blood pressure

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.
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
Pre-Procedural Guidelines for Assessing Blood Pressure01:10

Pre-Procedural Guidelines for Assessing Blood Pressure

Accurate blood pressure assessment is crucial for diagnosing and managing various health conditions. To ensure the reliability of these measurements, healthcare professionals must adhere to standardized pre-procedural guidelines. These guidelines enhance patient safety and improve the overall quality of healthcare. The following steps are essential for obtaining accurate and consistent blood pressure readings, from using the appropriate tools to ensuring effective communication with the patient.
Hormonal Regulation of Blood Pressure01:17

Hormonal Regulation of Blood Pressure

Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
Assessment of blood pressure in brachial artery(two-step method)01:23

Assessment of blood pressure in brachial artery(two-step method)

Measuring blood pressure is a fundamental skill in healthcare that aids in diagnosing and monitoring hypertension and other cardiovascular conditions. An aneroid sphygmomanometer, commonly used in clinical settings, offers a manual and precise method for blood pressure measurement. The technique for using this instrument involves specific steps that must be carefully executed to ensure accuracy. The following detailed description outlines a two-step technique for assessing blood pressure using...
Regulation of Stroke Volume01:27

Regulation of Stroke Volume

The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...

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Related Experiment Video

Updated: Jun 26, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
14:09

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

Published on: March 21, 2013

Orthostatics Are Useful in Assessing Volume Status: Myth or Reality?

Shorok Hassan1, Amar Bukvic1

  • 1Northwell, New Hyde Park, NY, USA; Department of Emergency Medicine, Staten Island University, Staten Island, NY, USA.

Emergency Medicine Clinics of North America
|June 24, 2026
PubMed
Summary
This summary is machine-generated.

Orthostatic vital signs (OVS) are often used for volume assessment but show poor accuracy for moderate hypovolemia. Alternative methods like ultrasound offer better insights into intravascular volume status.

Keywords:
Emergency departmentIntravascular volume statusOrthostatic hypotensionOrthostatic vital signs

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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
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Last Updated: Jun 26, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
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Published on: September 22, 2023

Area of Science:

  • Emergency Medicine
  • Physiology
  • Diagnostic Imaging

Background:

  • Orthostatic vital signs (OVS) are a traditional bedside method for assessing intravascular volume status in emergency settings.
  • Recent evidence questions the diagnostic accuracy of OVS, particularly for moderate hypovolemia, citing poor sensitivity and specificity.
  • Variability in OVS performance exists across diverse patient populations.

Purpose of the Study:

  • To review the physiological underpinnings of OVS.
  • To critically evaluate the diagnostic limitations of OVS in volume assessment.
  • To explore alternative and advanced methods for determining intravascular volume.

Main Methods:

  • Literature review of studies on orthostatic vital signs and intravascular volume assessment.
  • Analysis of the physiological basis and diagnostic accuracy of OVS.
  • Examination of point-of-care ultrasound and dynamic indices as alternative diagnostic tools.

Main Results:

  • OVS exhibit significant limitations in sensitivity and specificity for detecting moderate hypovolemia.
  • High inter-patient variability complicates the interpretation of OVS results.
  • Point-of-care ultrasound and dynamic indices show promise as more accurate methods for volume assessment.

Conclusions:

  • While OVS can serve as a simple bedside adjunct, their use in volume assessment requires cautious interpretation.
  • Clinical context is crucial when evaluating OVS findings.
  • Emerging diagnostic modalities offer more reliable assessment of intravascular volume status.