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Related Concept Videos

Hypoxia01:23

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Toxic Reactions: Overview01:26

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Toxidromes: Clinical Features01:30

Toxidromes: Clinical Features

Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...
Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
The Periodic Table and Organismal Elements00:57

The Periodic Table and Organismal Elements

Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally-occurring, and fewer still are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.The Periodic Table Provides Information about...
The Periodic Table and Organismal Elements01:27

The Periodic Table and Organismal Elements

Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
Periodic Table Provides Information...

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Related Experiment Video

Updated: Jun 3, 2026

Use of Electron Paramagnetic Resonance in Biological Samples at Ambient Temperature and 77 K
06:45

Use of Electron Paramagnetic Resonance in Biological Samples at Ambient Temperature and 77 K

Published on: January 11, 2019

[Toxic methemoglobinemia].

P Bender1, H Neuhaus

  • 1Medizinische Klinik, EVK Düsseldorf, Germany. philbender@web.de

Deutsche Medizinische Wochenschrift (1946)
|April 7, 2011
PubMed
Summary
This summary is machine-generated.

Severe hypoxemia after local anesthesia may indicate toxic methemoglobinemia. Prompt treatment with methylene blue is crucial for recovery and normalization of methemoglobin levels.

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Area of Science:

  • Anesthesiology
  • Toxicology
  • Emergency Medicine

Background:

  • Local anesthesia using prilocaine and bupivacaine can rarely lead to adverse effects.
  • Severe hypoxemia is a critical complication requiring immediate medical attention.

Observation:

  • A 19-year-old female presented with severe hypoxemia, central cyanosis, and dark-red blood post-ambulant surgery.
  • Physical examination revealed marked cyanosis and peripheral oxygen saturation of 85%, with unremarkable cardiac ultrasound and chest X-ray.

Findings:

  • Arterial blood gas analysis confirmed a methemoglobin concentration of 24%, indicative of toxic methemoglobinemia.
  • Treatment with ascorbic acid and methylene blue led to rapid clinical improvement and normalization of methemoglobin levels within 24 hours.

Implications:

  • Toxic methemoglobinemia should be suspected in cases of treatment-resistant hypoxemia following local anesthesia.
  • Immediate administration of methylene blue is the recommended therapy for this condition.