What are the symptoms of nitrite poisoning?

In daily life, some individuals may experience sodium nitrite poisoning. Due to a lack of awareness regarding its symptoms, timely diagnosis and treatment may be delayed, potentially missing the optimal therapeutic window. So, what are the symptoms of sodium nitrite poisoning?

What Are the Symptoms of Sodium Nitrite Poisoning?

Sodium nitrite poisoning primarily results from excessive ingestion or accidental ingestion of industrial-grade sodium nitrite. Poisoning caused by dietary overexposure tends to be milder, whereas poisoning due to accidental ingestion of industrial sodium nitrite is typically more severe and has an earlier onset. Generally, ingestion of 0.2–0.5 g of sodium nitrite can cause poisoning. Initial symptoms in poisoned children commonly include cyanosis, chest tightness, dyspnea, tachypnea, dizziness, and palpitations. In severe cases, patients may develop nausea, vomiting, bradycardia, arrhythmias, restlessness, hypotension, pulmonary edema, shock, seizures—or seizures progressing to coma—and ultimately succumb to respiratory and circulatory failure.

Patients with sodium nitrite poisoning require prompt intervention, including induced emesis, gastric lavage, and catharsis, along with diuretics to enhance toxin elimination. Clinically, initial management involves oxygen supplementation and continuous monitoring of vital signs. Methylene blue (also known as methylthioninium chloride) is the specific antidote; other supportive treatments may also be administered. Critically ill patients may benefit from blood purification therapies. Symptomatic management includes vasopressor and anti-shock therapy for hypotension; dehydration therapy for cerebral edema; mechanical ventilation and respiratory stimulants for respiratory failure; and careful maintenance of fluid-electrolyte balance and acid-base homeostasis.

During recovery, patients may consume liquid or semi-liquid foods that are easily digestible. Spicy or irritating foods should be avoided to prevent injury to the oral, pharyngeal, and gastric mucosa. We hope this information proves helpful!