Baricity
Baricity is a term used in anesthesiology to describe the density of a substance, typically a local anesthetic, relative to the density of cerebrospinal fluid (CSF). The concept of baricity is crucial in spinal anesthesia as it influences the distribution of the anesthetic within the subarachnoid space.
Types of Baricity[edit | edit source]
Baricity is classified into three main types:
- Hypobaric: Solutions that are less dense than CSF. These solutions tend to rise within the subarachnoid space.
- Isobaric: Solutions that have the same density as CSF. These solutions remain relatively stationary at the site of injection.
- Hyperbaric: Solutions that are denser than CSF. These solutions tend to settle in the lower parts of the subarachnoid space.
Clinical Applications[edit | edit source]
The choice of baricity in spinal anesthesia is determined by the desired spread of the anesthetic. For example:
- Hypobaric solutions are used in procedures where the anesthetic needs to ascend, such as in hip surgery.
- Isobaric solutions are often used for procedures where a more predictable and localized anesthetic effect is required.
- Hyperbaric solutions are commonly used in lower limb surgery and cesarean sections to ensure the anesthetic remains in the lower regions of the spine.
Preparation of Solutions[edit | edit source]
The baricity of a solution can be adjusted by adding substances such as glucose to increase density (creating a hyperbaric solution) or by diluting the solution to decrease density (creating a hypobaric solution).
Related Concepts[edit | edit source]
See Also[edit | edit source]
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