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Blood pressure measurement is a fundamental clinical procedure, providing crucial data for assessing cardiovascular health. Among the various sites for this measurement, the brachial and popliteal arteries are predominantly utilized due to their accessibility and the reliability of their readings. This lesson delves into the anatomical significance, methodology, and considerations of measuring blood pressure at these locations.
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Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

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Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...
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Increased Intracranial Pressure l: Introduction01:14

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Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component...
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Increased Intracranial Pressure ll: Pathophysiology01:29

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Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins...
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Related Experiment Video

Updated: May 5, 2026

Epidural Intracranial Pressure Measurement in Rats Using a Fiber-optic Pressure Transducer
09:04

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Anal pressure studies in spinal patients

I C Wheatley, K J Hardy, J Dent

    Gut
    |June 1, 1977
    PubMed
    Summary

    Patients with spinal cord lesions exhibit significantly lower maximal and sphincter pressure compared to healthy controls. Rectal distension further reduced anal sphincter pressure in both groups, more pronouncedly in the spinal cord injury group.

    Area of Science:

    • Neuroscience
    • Gastroenterology
    • Physiology

    Background:

    • Spinal cord lesions can affect autonomic nervous system control over pelvic floor function.
    • Anal sphincter pressure is crucial for fecal continence.
    • Understanding these pressures is vital for managing bowel dysfunction in spinal cord injury patients.

    Purpose of the Study:

    • To compare maximal and sphincter pressure in patients with spinal cord lesions versus healthy controls.
    • To assess the effect of rectal distension on anal sphincter pressure in both groups.

    Main Methods:

    • Perfused sleeve manometry was used to measure maximal and sphincter pressure.
    • 22 patients with spinal cord lesions and 10 healthy controls participated.
    • Rectal distension was induced using a 100 ml air-inflated balloon.

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    Real-Time Assessment of Spinal Cord Microperfusion in a Porcine Model of Ischemia/Reperfusion
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    Main Results:

    • Mean resting anal sphincter pressure was significantly lower in spinal cord lesion patients (63+/-8 mm Hg) compared to controls (116+/-14 mm Hg; P < 0.01).
    • Rectal distension caused a significant fall in anal sphincter pressure in both groups.
    • The pressure drop was more substantial in the spinal group (to 33+/-6 mm Hg) than in the control group (to 78+/-10 mm Hg).

    Conclusions:

    • Spinal cord lesions are associated with impaired anal sphincter function.
    • Reduced anal sphincter pressure in spinal cord injury patients may contribute to fecal incontinence.
    • These findings highlight the need for targeted interventions to improve bowel management in this population.