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Videos de Conceptos Relacionados

Disorders of Acid-Base Balance01:29

Disorders of Acid-Base Balance

The human body maintains a precise pH range of arterial blood between 7.35 and 7.45. Deviations result in either acidosis (pH < 7.35) or alkalosis (pH > 7.45). These conditions are further classified as respiratory or metabolic disorders based on their underlying cause.
Respiratory Acidosis and Alkalosis
Respiratory acidosis occurs due to an increase in the partial pressure of carbon dioxide PCO2 in the blood. It often arises from shallow breathing or impaired gas exchange caused by...
Diagnosing Acidosis and Alkalosis01:24

Diagnosing Acidosis and Alkalosis

Diagnosing acid-base imbalances involves systematically analyzing arterial blood samples, focusing on three key measurements: pH, bicarbonate (HCO3−) concentration, and carbon dioxide partial pressure (PCO2). This analysis follows a four-step process that helps identify the imbalance's underlying cause and nature.
First, the pH level is assessed to determine whether the blood pH is normal (7.35–7.45), low (acidosis), or high (alkalosis).
Next, the PCO2  and HCO3−  values are examined to...
Blood Studies I: ABG and VBG01:26

Blood Studies I: ABG and VBG

Blood studies are critical in the medical field, enabling healthcare professionals to assess a patient's health status accurately. This page will focus on two significant blood studies: Arterial Blood Gas (ABG) and Venous Blood Gas (VBG).
Arterial Blood Gas (ABG)
Arterial Blood Gas (ABG) studies are crucial for assessing the lungs' ability to supply oxygen and remove carbon dioxide, reflecting the patient's ventilation status. They also help understand the kidneys' capacity to reabsorb or...
Titration of a Weak Acid with a Strong Base01:30

Titration of a Weak Acid with a Strong Base

In titrating a weak acid with a strong base, different calculation methods are applied at various stages. Initially, the pH of a weak acid like acetic acid is calculated using its dissociation constant (Ka) and an ICE table. Upon addition of a strong base such as sodium hydroxide, a buffer forms, and its pH is determined using the Henderson-Hasselbalch equation. As more base is added and the titration reaches the halfway point, the pH becomes equal to the pKa of the acid, indicating equal...

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The Journal of chemical physics·2013
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The Journal of chemical physics·2012
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Computational verification of two universal relations for simple ionic liquids. Kinetic properties of a model 2:1 molten salt.

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Video Experimental Relacionado

Updated: Jul 24, 2026

Open Tracheostomy Gastric Acid Aspiration Murine Model of Acute Lung Injury Results in Maximal Acute Nonlethal Lung Injury
09:16

Open Tracheostomy Gastric Acid Aspiration Murine Model of Acute Lung Injury Results in Maximal Acute Nonlethal Lung Injury

Published on: February 26, 2017

Los niveles sanguíneos después de la nitroglicerina sublingual.

P W Armstrong, J A Armstrong, G S Marks

    Circulation
    |March 1, 1979
    PubMed
    Resumen

    La nitroglicerina sublingual (GTN) entra y sale rápidamente del torrente sanguíneo después de la administración. Este estudio desarrolló un método para medir GTN, ayudando a la investigación en terapias de nitratos.

    Área de la Ciencia:

    • Farmacología Farmacología.
    • Química clínica es la química clínica.

    Sus antecedentes:

    • La medición precisa de la nitroglicerina (GTN) en la sangre es crucial para el análisis farmacocinético.
    • Los métodos anteriores carecían de la sensibilidad y especificidad requeridas para la determinación del nivel sanguíneo de GTN.

    Objetivo del estudio:

    • Desarrollar y validar un método sensible para medir el GTN en la sangre humana.
    • Para caracterizar el perfil farmacocinético de GTN. administrado por vía sublingual.

    Principales métodos:

    • Se empleó cromatografía gas-líquido con detección de captura de electrones.
    • El dinitrato de isosorburo se utilizó como el estándar interno para la cuantificación.
    • Se analizaron 10 estudios en los que participaron voluntarios normales que recibieron 0,6 mg de GTN sublingual.

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    Last Updated: Jul 24, 2026

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    Principales resultados:

    • La GTN se detectó en la sangre dentro de los 0,5 minutos posteriores a la administración.
    • Los niveles máximos en sangre de 2,3 +/- 0,36 ng/ml se alcanzaron a los 2 minutos.
    • Las concentraciones de GTN disminuyeron rápidamente, con una vida media de aproximadamente 7,5 minutos.

    Conclusiones:

    • La GTN sublingual exhibe una rápida absorción y eliminación del torrente sanguíneo.
    • La farmacocinética observada sugiere una distribución extensa y una depuración rápida, lo que indica vías de eliminación no hepáticas.
    • El método analítico desarrollado facilita una mayor investigación sobre la eficacia de la terapia con nitratos.