A patient presents with lower gastrointestinal bleed. Sigmoidoscopy shows ulcers in the sigmoid. Biopsy from this area shows flask-shaped ulcers. Which of the following is the most appropriate treatment –
**Core Concept**
The patient's presentation with lower gastrointestinal bleed, sigmoidoscopy findings, and biopsy results suggest a diagnosis of amoebic colitis, caused by Entamoeba histolytica. The flask-shaped ulcers are a characteristic feature of this condition.
**Why the Correct Answer is Right**
Amoebic colitis is caused by the protozoan parasite Entamoeba histolytica, which invades the colonic mucosa and causes ulceration. The flask-shaped ulcers are a result of the amoebae's lytic activity, leading to the destruction of the mucosa and submucosa. Treatment of amoebic colitis typically involves antiparasitic medications that target the amoebae directly. Metronidazole is a commonly used treatment option for amoebic colitis, as it is effective against the parasite and has a rapid onset of action.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not address the underlying cause of the patient's condition. Amoebic colitis requires specific antiparasitic treatment, whereas this option may be more suitable for other conditions such as peptic ulcer disease.
**Option B:** This option is incorrect because it is not a first-line treatment for amoebic colitis. While antibiotics may be used in some cases, they are not the primary treatment for this condition.
**Option C:** This option is incorrect because it does not address the specific pathophysiology of amoebic colitis. The patient's condition requires treatment that targets the amoebae directly, rather than managing symptoms.
**Clinical Pearl / High-Yield Fact**
Amoebic colitis can be distinguished from other causes of lower gastrointestinal bleed by the presence of flask-shaped ulcers on sigmoidoscopy and biopsy. This characteristic feature is a key diagnostic clue for this condition.
**Correct Answer:** C. Metronidazole is the most appropriate treatment for amoebic colitis, given its effectiveness against the parasite and rapid onset of action.