Corrosive, Acid, Alkali and Cyanide Poisoning

Connect the poison → mechanism → tissue or cellular effect → clinical finding → treatment principle → forensic significance for rapid revision.

Structured according to the supplied three-section AIM Concept Integration format. :contentReference[oaicite:0]{index=0}

1. THE TOPIC IN ONE CONNECTED FLOW

Corrosive poisoning begins with direct chemical injury, whereas cyanide produces rapid systemic cellular hypoxia. The key is to connect the type of poison with its mechanism: acids mainly coagulate proteins, alkalis liquefy tissues, oxalic acid additionally binds calcium, phenol causes local and systemic toxicity, and cyanide blocks mitochondrial oxygen use.

Exposure
Acid • Alkali • Phenol • Oxalate • Cyanide

→

Core Mechanism
Corrosion, calcium binding or mitochondrial blockade

→

Tissue / Cellular Change
Coagulative necrosis • liquefactive necrosis • hypocalcemia • histotoxic hypoxia

→

Clinical Effect
Pain, dysphagia, vomiting, shock, tetany or rapid collapse

→

Treatment Principle
Support ABC • avoid re-injury • specific antidote where applicable

→

Outcome / Forensic Link
Perforation, stricture, organ failure or death → interpret with circumstances

2. KEY CLINICAL CONNECTIONS

Acid vs Alkali Injury

Strong acid → protein denaturation → coagulative necrosis → eschar formation

↕

Strong alkali → protein dissolution + fat saponification → liquefactive necrosis → deeper penetration → esophageal stricture

Phenol and Oxalate

Phenol → protein coagulation + local anesthesia → pale relatively painless burn → systemic CNS depression

↓

Oxalic acid → calcium binding → hypocalcemia + calcium oxalate crystals → tetany, arrhythmia and renal injury

Cyanide: Rapid Systemic Toxicity

Cyanide → cytochrome c oxidase inhibition → failure of oxidative phosphorylation → histotoxic hypoxia

↓

Severe lactic acidosis + neurological/cardiovascular collapse → hydroxocobalamin ± sodium thiosulfate

3. AIM HIGH-YIELD INTEGRATION REVIEW

⭐ Strong acids → coagulative necrosis; strong alkalis → liquefactive necrosis with deeper penetration.

Sulphuric acid → strong dehydration + heat → brown-black corrosive charring.

⭐ Nitric acid → reaction with aromatic amino acids → yellow xanthoproteic staining.

Phenol → local anesthetic effect + protein coagulation → pale burns that may be less painful than expected.

⭐ Oxalic acid → calcium binding → hypocalcemia + renal calcium oxalate deposition → tetany and acute kidney injury.

⭐ Cyanide → Complex IV blockade → histotoxic hypoxia → severe lactic acidosis and rapid brain-heart failure.

Corrosive ingestion → avoid induced vomiting, routine gastric lavage and chemical neutralization → reduce additional tissue injury.

Clinical or postmortem findings → identify a likely toxic mechanism → must still be correlated with circumstances and toxicology before medico-legal interpretation.