Postmortem finding in carbon monoxide poisoning is-
**Core Concept**
Carbon monoxide (CO) poisoning occurs when CO binds to hemoglobin in red blood cells, forming carboxyhemoglobin (COHb), which reduces the oxygen-carrying capacity of blood. The postmortem finding in CO poisoning is a key diagnostic clue.
**Why the Correct Answer is Right**
The postmortem finding in CO poisoning is the presence of carboxyhemoglobin in the blood. This occurs because CO displaces oxygen from hemoglobin, forming a stable complex that is not easily broken down. The presence of COHb can be detected in the blood, tissues, or breath of the deceased, providing a crucial clue to the cause of death.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while histopathological changes may be observed in tissues affected by CO poisoning, such as the heart and brain, they are not the primary postmortem finding.
**Option B:** This option is incorrect because the presence of methemoglobin is a feature of methemoglobinemia, a different condition caused by the presence of methylene blue or other substances.
**Option C:** This option is incorrect because the presence of hemolysis may be observed in some cases of CO poisoning, particularly if the individual has a pre-existing hemoglobinopathy or other underlying condition, but it is not a specific postmortem finding for CO poisoning.
**Clinical Pearl / High-Yield Fact**
CO poisoning can be difficult to diagnose in the living, but the presence of COHb in the blood is a key diagnostic clue. In the postmortem setting, the presence of COHb can be detected using various methods, including gas chromatography and mass spectrometry.
**Correct Answer: C.**