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Gas Chromatography: Sample Injection Systems01:08

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In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
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Calculating drug dosage and accumulation in multiple-dose regimens is crucial for achieving therapeutic efficacy while avoiding toxicity. This involves determining the plasma drug concentrations over time to optimize dosing schedules. The principle of superposition is fundamental in this process, allowing for the prediction of drug concentration in plasma following multiple doses based on single-dose data.The principle of superposition asserts that the plasma concentration-time curves from...
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Related Experiment Video

Updated: Jan 23, 2026

Home-Based Transcranial Direct Current Stimulation Device Development: An Updated Protocol Used at Home in Healthy Subjects and Fibromyalgia Patients
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Hemopneumothorax After Trigger Point Injection for Fibromyalgia.

Sinan Genç, Müge Günalp Eneyli, Onur Polat

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    Summary

    Trigger point injections (TPIs) for chronic back pain can lead to serious complications like hemopneumothorax. This case highlights the need for awareness of potential life-threatening risks associated with chest wall TPIs.

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    Area of Science:

    • Pain Management
    • Interventional Procedures
    • Thoracic Medicine

    Background:

    • Trigger point injections (TPIs) and acupuncture are common for chronic back pain.
    • While generally safe, needling in the cervical and thoracic regions carries risks of severe complications.

    Observation:

    • A case study reported a 45-year-old woman experiencing dyspnea and dizziness post-TPI for fibromyalgia.
    • The patient presented to the emergency department following the procedure.

    Findings:

    • Thoracic CT revealed a significant hemopneumothorax and lung collapse in the right hemithorax.
    • The condition was successfully managed using chest-tube drainage and video-assisted thoracoscopic surgery.

    Implications:

    • Practitioners must be vigilant for hemopneumothorax during TPIs on the chest wall.
    • This emphasizes the importance of recognizing and promptly treating rare but severe complications of TPIs.