Fish Stings

MANUAL MINORS

Fish stings can occur from accidental or intentional contact with venomous or predatory fish, such as scorpionfish, stonefish, lionfish, or sharks. These stings can range from mild injuries to severe wounds and envenomations. Venom from venomous fish causes intense pain, swelling, and, in some cases, systemic symptoms like breathing difficulties, muscle cramps, or shock.

Diagnosis

Diagnosis is based on the context of the accident, typically occurring during water activities or diving, along with severe pain, swelling, and redness at the sting site. In cases of venomous fish, symptoms appear rapidly, with intense pain that may radiate and affect distant areas.

Physical examination may reveal lacerations, embedded spines, or bite marks. In severe cases, the patient may present with systemic symptoms such as nausea, dizziness, breathing difficulty, or hypotension.

Differential Diagnosis

Condition	Key Difference
Jellyfish sting	Linear stinging lesions without deep lacerations or embedded spines.
Cut injury in water	Clean laceration from contact with sharp underwater objects, without venom or systemic symptoms.
Allergic reaction	Swelling and skin redness without a history of fish sting.
Marine bacterial infection	Infected wound with progressive redness, but without immediate intense pain or venom.

Emergency Management

Immediate management in the emergency setting includes cleaning the wound with seawater or saline and removing any visible spines or foreign bodies with tweezers. For venomous fish stings, immersing the affected area in hot water (42-45°C) for 30-90 minutes can help alleviate pain and neutralise toxins. Analgesics, such as NSAIDs or opioids, are administered for severe pain, and antihistamines may be prescribed to reduce the inflammatory response.

If the patient shows signs of systemic toxicity, such as breathing difficulty, muscle cramps, or shock, stabilising vital functions with intravenous fluids, oxygen, and hospital monitoring is crucial. Antibiotics should be given if there is a risk of infection, especially for open wounds, to cover marine bacteria like Vibrio.

Definitive Treatment

Definitive treatment depends on the severity of the injury. For superficial wounds, symptomatic management and proper wound cleaning are usually sufficient. Deeper lacerations may require sutures and prophylactic antibiotics.

Severe envenomations or systemic complications may require prolonged hospitalisation and monitoring, with antivenom administration if available for certain species. Follow-up care includes monitoring for infections and possible surgical intervention if necrotic tissue or significant structural damage is present.