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Related Concept Videos

Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies01:20

Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies

The key difference between Superficial Vein Thrombosis (SVT) and Deep Vein Thrombosis (DVT) lies in their location and severity.Clinical ManifestationsSVT typically presents with localized pain, tenderness, and redness along the course of a superficial vein, often accompanied by a palpable, cord-like structure under the skin. This condition is usually less dangerous than DVT but can be uncomfortable and may lead to complications such as cellulitis or, rarely, a clot extension into the deep...
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Veins as Blood Reservoirs

Veins, while chiefly responsible for circulating blood back to the heart, also function as storage vessels for blood. They house approximately 64 percent of the body's total blood volume, a feat made possible by their high capacitance—the inherent ability to expand and accommodate large volumes of blood, even under low pressure. The large diameter and thin walls of veins augment their distensibility, significantly more so than arteries, due to their classification as capacitance vessels. When...
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Assessment of the Cardiovascular System III: Palpation

Palpation involves feeling the body to evaluate texture, size, consistency, and tenderness for assessing cardiovascular health. The following steps are organized in a head-to-toe order:
Jugular Venous Pressure (JVP) Measurement
Position the patient at a thirty- to forty-five-degree angle or in a semi-fowler's position. Look for the highest point of pulsation in the internal jugular vein and measure the vertical distance to the angle of Loius or sternal angle. A normal JVP is 3-4 cm above the...
Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
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Updated: Jun 23, 2026

Image Acquisition Method for the Sonographic Assessment of the Inferior Vena Cava
06:59

Image Acquisition Method for the Sonographic Assessment of the Inferior Vena Cava

Published on: January 13, 2023

[Volume status and central venous pressure].

U Janssens1, J Graf

  • 1Medizinische Klinik, St.-Antonius-Hospital, Dechant-Deckers-Str. 8, 52249 Eschweiler, Deutschland. uwe.janssens@sah-eschweiler.de

Der Anaesthesist
|April 25, 2009
PubMed
Summary

Central venous pressure (CVP) does not accurately reflect a patient's fluid volume status. Mean circulatory filling pressure is a better indicator, but it cannot be measured clinically.

Area of Science:

  • Physiology
  • Hemodynamics
  • Critical Care Medicine

Context:

  • Central venous pressure (CVP) and pulmonary artery occluded pressure are commonly used to assess fluid status.
  • However, these pressures may not correlate with actual circulating blood volume or fluid responsiveness.
  • Venous compliance significantly impacts pressure-volume relationships.

Purpose:

  • To evaluate the correlation between central venous pressure (CVP) and circulating blood volume.
  • To determine the reliability of CVP in assessing volume status and fluid responsiveness.

Summary:

  • Central venous pressure (CVP) and pulmonary artery occluded pressure do not reliably correlate with circulating blood volume or fluid responsiveness.
  • The high compliance of the venous system (70% of blood volume) means small pressure changes accompany large volume shifts.

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Image Acquisition Method for the Sonographic Assessment of the Inferior Vena Cava
06:59

Image Acquisition Method for the Sonographic Assessment of the Inferior Vena Cava

Published on: January 13, 2023

Continuous Venous-Arterial Doppler Ultrasound During a Preload Challenge
09:32

Continuous Venous-Arterial Doppler Ultrasound During a Preload Challenge

Published on: January 20, 2023

  • Homeostatic mechanisms maintain adequate CVP for cardiovascular function, masking true volume status.
  • Mean circulatory filling pressure (MCFP) is a more accurate indicator but is not clinically measurable.
  • Stressed and unstressed blood volumes, which determine MCFP, are also difficult to quantify.

    • Impact:

    • Highlights the limitations of CVP in clinical practice for volume status assessment.
    • Suggests that CVP is an insufficient surrogate for evaluating a patient's fluid volume.
    • Emphasizes the complexity of cardiovascular regulation and the need for alternative assessment methods.