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Related Concept Videos

Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

Local Anesthetics: Clinical Application as Spinal Anesthesia

1.5K
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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Local Anesthetics: Clinical Application as Epidural Anesthesia01:29

Local Anesthetics: Clinical Application as Epidural Anesthesia

764
Epidural anesthetics are administered in the fat-filled epidural space, the outermost part of the spinal canal. This technique is commonly employed for pain management and anesthesia during lower abdomen and pelvis surgeries or labor and delivery.
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...
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Systematic Error: Methodological and Sampling Errors01:15

Systematic Error: Methodological and Sampling Errors

11.0K
In the case of systematic errors, the sources can be identified, and the errors can be subsequently minimized by addressing these sources. According to the source, systematic errors can be divided into sampling, instrumental, methodological, and personal errors.
Sampling errors originate from improper sampling methods or the wrong sample population. These errors can be minimized by refining the sampling strategy. Defective instruments or faulty calibrations are the sources of instrumental...
11.0K
Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia01:16

Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia

1.4K
Intravenous regional anesthesia or the Bier block technique is used to anesthetize a specific limb or extremity. It uses exsanguinated or blood-drained vessels to transport local anesthetics or LAs to the peripheral nerve trunks. Lidocaine without vasoconstrictors like epinephrine is most commonly used for this technique. Other drugs used are prilocaine, ropivacaine, and chloroprocaine. Bupivacaine is not recommended for this technique due to its high cardiac toxicity.
One of the advantages of...
1.4K
Fundamental Attribution Error01:14

Fundamental Attribution Error

13.8K
According to some social psychologists, people tend to overemphasize internal factors as explanations—or attributions—for the behavior of other people. They tend to assume that the behavior of another person is a trait of that person, and to underestimate the power of the situation on the behavior of others. They tend to fail to recognize when the behavior of another is due to situational variables, and thus to the person’s state. This erroneous assumption is...
13.8K
Random Error01:04

Random Error

9.8K
Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
9.8K

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Updated: Feb 9, 2026

Pre-clinical Orthotopic Murine Model of Human Prostate Cancer
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Staging errors in clinically localized prostatic cancer

W J Catalona, A J Stein

    The Journal of Urology
    |March 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Tumor grade and local extension are key predictors of lymph node involvement in prostate cancer. Accurate staging is crucial, as understaged patients experienced early treatment failure.

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    Isolation of Cancer Stem Cells From Human Prostate Cancer Samples
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    Isolation of Cancer Stem Cells From Human Prostate Cancer Samples

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    Area of Science:

    • Urology
    • Oncology
    • Pathology

    Background:

    • Prostate cancer staging relies on clinical and pathological factors.
    • Understanding predictors of treatment failure is vital for patient outcomes.

    Purpose of the Study:

    • To examine the relationship between tumor grade, local extension, lymph node involvement, and early treatment failure in prostate cancer patients.
    • To identify key prognostic indicators for radical prostatectomy candidates.

    Main Methods:

    • Retrospective analysis of 96 patients with clinical stage A or B prostate cancer.
    • Evaluation of tumor grade, local tumor extension, and lymph node involvement.
    • Correlation of these factors with early treatment failure.

    Main Results:

    • 40% of patients had local extension and/or nodal involvement.
    • Tumor grade correlated with local extension and nodal involvement.
    • Clinical grade was more predictive of nodal involvement than individual parameters.
    • Understaged patients experienced early treatment failure.

    Conclusions:

    • Tumor grade and local extension are significant predictors of lymph node involvement in prostate cancer.
    • Surgical stage strongly correlates with lymph node status.
    • Accurate clinical staging is essential to prevent early treatment failure.