Question 1: A dead body is having cadaveric lividity of bluish green color. The most likely cause of death is by poisoning due to:
- A. Hydrogen sulfide (Correct Answer)
- B. Hydrocyanic acid
- C. Oleander
- D. Sodium nitrite
Explanation: ***Hydrogen sulfide***
- **Hydrogen sulfide poisoning** classically causes a **bluish-green cadaveric lividity** due to the formation of sulfhemoglobin.
- This distinct discoloration is a key indicator often noted during post-mortem examination in cases of hydrogen sulfide exposure.
*Hydrocyanic acid*
- **Hydrocyanic acid poisoning** typically leads to a **cherry-red lividity** due to the inhibition of cytochrome oxidase, preventing tissue oxygen utilization, which is different from the bluish-green color described.
- The bright red color results from the persistence of oxygenated hemoglobin in the venous blood.
*Oleander*
- **Oleander poisoning** affects the heart, causing **cardiac arrhythmias** and bradycardia, but does not typically produce a characteristic or distinct cadaveric discoloration like the bluish-green hue.
- Lividity would generally be a more typical reddish-purple, consistent with simple hypostasis.
*Sodium nitrite*
- **Sodium nitrite poisoning** causes **methemoglobinemia**, leading to a characteristic **chocolate-brown or grayish-blue lividity** due to the oxidation of hemoglobin, which differs from the specific bluish-green described.
- This change is due to the formation of methemoglobin, which cannot carry oxygen effectively.