During a post-mortem examination of a body found in a cold storage room maintained at 4°C, the examiner notes that body temperature has dropped to 18°C, 24 hours after death. Which of the following is the commonest factor that causes delayed algor mortis in such scenarios?

Explanation

## Algor Mortis: Factors Causing Delayed (Slower) Cooling **Key Point:** Algor mortis is the post-mortem cooling of the body. The **commonest** factor that causes delayed (slower) algor mortis in forensic practice is **obesity and high subcutaneous fat**, which acts as a thermal insulator reducing heat dissipation to the environment. ### Factors Affecting Algor Mortis Rate | Factor | Effect on Cooling | Mechanism | |--------|-------------------|-----------| | **Obesity / High subcutaneous fat** | **DELAYS cooling (most common)** | Fat is a poor thermal conductor; insulates the body core | | Low ambient temperature | Accelerates cooling | Greater temperature gradient drives faster heat loss | | High ambient temperature | Slows cooling | Reduced temperature gradient | | Thin body habitus | Accelerates cooling | Less insulation | | Sepsis/high pre-mortem fever | Accelerates cooling | Greater initial temperature difference | | Wet clothing/immersion | Accelerates cooling | Evaporative and conductive heat loss | | Thick/heavy clothing | Delays cooling | Insulation effect | **High-Yield:** Among all factors, **obesity (high subcutaneous fat)** is the **most commonly encountered** cause of delayed algor mortis in forensic casework. Fat tissue has low thermal conductivity (~0.2 W/m·K vs ~0.6 W/m·K for muscle), making it an effective insulator that retards heat loss from the body core. > **Note on the scenario:** In a cold storage room at 4°C, the large temperature gradient (37°C body vs 4°C environment) would actually *accelerate* cooling, not delay it. The question asks for the *commonest* factor causing delayed algor mortis in general forensic practice — which is obesity/high subcutaneous fat, not the cold environment itself. ### Temperature Drop Timeline (Normal Conditions) - **First 12 hours:** ~1–1.5°C per hour - **After 12 hours:** ~0.5–1°C per hour - **Obese individuals:** Rate may be reduced by 30–50% compared to lean individuals **Clinical Pearl:** The Henssge nomogram incorporates body weight as a corrective factor precisely because obesity significantly delays algor mortis. A higher corrective factor is applied for obese bodies when estimating time since death. *(Reference: Henssge C, Knight B — Forensic Medicine; also Modi's Medical Jurisprudence & Toxicology)* **Mnemonic:** **COLD DELAYS** — **C**lothing (thick), **O**besity, **L**ow humidity, **D**ry environment → all DELAY algor mortis; but **Obesity** is the *most common* factor encountered clinically. **Warning:** Do not confuse low ambient temperature with delayed cooling — a cold environment actually *increases* the temperature gradient and drives faster heat loss, thereby *accelerating* algor mortis rather than delaying it.