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Local Anesthetics: Adverse Effects

Local Anesthetics: Adverse Effects

While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...

Drug Toxicity: Dose-Dependent Reactions

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...

Toxic Reactions: Overview

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,...

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Related Experiment Video

Updated: Jul 2, 2026

Targeted and Selective Treatment of Pluripotent Stem Cell-derived Teratomas Using External Beam Radiation in a Small-animal Model

Targeted and Selective Treatment of Pluripotent Stem Cell-derived Teratomas Using External Beam Radiation in a Small-animal Model

Published on: February 17, 2019

[Therapy-induced effects in normal tissue].

G van Kaick¹, S Delorme

¹Abteilung E010 - Radiologie, Deutsches Krebsforschungszentrum (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Deutschland.

|August 19, 2008

Summary

This summary is machine-generated.

Modern cancer treatments improve survival, but long-term side effects can mimic tumor recurrence. Understanding these treatment sequelae is crucial for accurate diagnosis and patient care.

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Last Updated: Jul 2, 2026

Targeted and Selective Treatment of Pluripotent Stem Cell-derived Teratomas Using External Beam Radiation in a Small-animal Model

Targeted and Selective Treatment of Pluripotent Stem Cell-derived Teratomas Using External Beam Radiation in a Small-animal Model

Published on: February 17, 2019

Functional Interrogation of Adult Hypothalamic Neurogenesis with Focal Radiological Inhibition

Functional Interrogation of Adult Hypothalamic Neurogenesis with Focal Radiological Inhibition

Published on: November 14, 2013

Studying Normal Tissue Radiation Effects using Extracellular Matrix Hydrogels

Studying Normal Tissue Radiation Effects using Extracellular Matrix Hydrogels

Published on: July 24, 2019

Area of Science:

Oncology
Radiology
Medical Imaging

Context:

Increased cancer survival rates lead to more frequent observation of long-term treatment sequelae.
Distinguishing treatment-induced tissue changes from tumor recurrence poses diagnostic challenges.

Purpose:

To review the diverse long-term sequelae of cancer therapies, including surgery, radiotherapy, and chemotherapy.
To highlight how these effects can mimic or obscure tumor recurrences, complicating differential diagnosis.

Summary:

Radiotherapy can cause blood-brain barrier disruption, radiation pneumonitis, bone issues (osteodystrophy, osteoradionecrosis), bone marrow changes, and increased breast tissue density.
Chemotherapy may induce white matter abnormalities, lung fibrosis, cardiomyopathy, and bone marrow signal changes on MRI.
Secondary cancers and leukemia are the most severe long-term complications, linked to both radiation and chemotherapy.

Impact:

Accurate identification of treatment sequelae is vital for appropriate patient management and avoiding misdiagnosis of cancer progression.
Awareness of these effects aids clinicians in interpreting imaging findings and managing long-term cancer survivors.