Central Blood Volume
Central Blood Volume - Related Videos
01:21
Measuring Cerebral Blood Volume in the Auditory Cortex Using Vascular Space Occupancy
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2025
Position a human participant’s head within the head coil of a functional magnetic resonance imaging, or fMRI, system.Employ vascular space occupancy or VASO, a technique to measure changes in cerebral blood volume, or CBV, the blood volume within the brain.Begin by applying an inversion recovery pulse to suppress signals from blood, allowing only signals from the surrounding tissue within the region to be detected.Next, use MRI-compatible earbuds to deliver auditory stimuli.The stimuli reach...
08:54
Measuring Blood Pressure in Mice using Volume Pressure Recording, a Tail-cuff Method
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Cited by 175 •
2009
The CODA 8-Channel High Throughput Non-Invasive Blood Pressure system measures the blood pressure in up to 8 mice or rats simultaneously. This tail-cuff system uses Volume Pressure Recording (VPR) to measure the blood pressure by determining the tail blood volume.
04:09
Large Volume Blood Collection from Swine for In Vitro Applications: Use of Intracardiac Cannulation and a Vacuum Pump as a Terminal Procedure
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2025
Here we present a method to collect a large volume of blood from swine using percutaneous intracardiac cannulation connected to a vacuum pump, as a terminal procedure.
01:25
The Central Dogma
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2019
Overview The central dogma of biology states that information encoded in the DNA is transferred to messenger RNA (mRNA), which then directs the synthesis of protein. The set of instructions that enable the mRNA nucleotide sequence to be decoded into amino acids is called the genetic code. The universal nature of this genetic code has spurred advances in scientific research, agriculture, and medicine. RNA Is the Missing Link between DNA and Proteins In the early 1900s, scientists discovered...
02:21
Generation of a Murine Model with a Central Nervous System Infection
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2025
This video demonstrates the generation of a mouse model with a CNS infection. A suckling pup is injected with the virus both intracranially and intraperitoneally. The virus spreads, infecting the CNS causing neuronal cell death and inflammation. The pup is assessed for symptoms of infection as the disease progresses.
FAQs
The key link is ventricular preload, the amount of filling before contraction. When more blood reaches the thoracic vessels and heart, ventricular filling can increase, allowing the Frank-Starling mechanism to augment stroke volume. Because cardiac output depends on stroke volume, shifts in central volume can therefore change systemic circulation without requiring a change in heart rate.
Venous tone, body position, respiration, and intravascular fluid distribution can each change how much blood is located centrally. Venous constriction or relaxation alters venous storage and return, while posture and breathing redistribute blood within the circulation. These shifts modify ventricular filling, so the same overall circulating volume may produce different preload and cardiac output at different times.
Changing position redistributes intravascular fluid, which can alter the amount reaching the thoracic vessels and the heart. The resulting change in venous return modifies ventricular preload and may influence stroke volume through the Frank-Starling relationship. This explains why clinicians must interpret cardiovascular responses in light of posture and other current physiological conditions, rather than viewing volume-related findings in isolation.
Measurements and related indicators provide a way to assess how blood distribution is affecting cardiac filling and systemic circulation. They can help connect observed hemodynamic instability with changes in venous return, preload, stroke volume, or cardiac output. Used with clinical context, these data support monitoring of circulatory adaptation during physiological stress and disease.
In hemorrhage or shock, assessment can help clinicians judge whether altered filling and circulation should prompt consideration of fluid administration, vasoactive therapy, or closer cardiovascular monitoring. The value lies in linking a hemodynamic finding to the circulation's current state, rather than treating a volume-related measurement as an isolated prescription for one intervention.
These conditions can produce hemodynamic instability, but assessment still centers on how thoracic blood distribution affects cardiac filling and systemic circulation. In heart failure, shock, and hemorrhage, related measurements or indicators help characterize the cardiovascular response to stress. That information gives clinicians a physiologic basis for monitoring and selecting fluid or vasoactive strategies.