The discolouration that appears in the dependent areas of the body after death is called?

Appeared in: AIIMS Patna NO - 2020

Explanation

Livor mortis, also known as postmortem lividity, is the gravitational pooling of blood in the dependent (lowest) parts of the body after death.
This process occurs because the heart is no longer circulating blood, allowing heavy red blood cells to settle due to gravity.
It manifests as a distinct purplish-red discoloration of the skin, which is a key sign used to confirm death and estimate its time.
The process typically starts within 30 minutes to 2 hours and becomes fixed in about 8-12 hours.

Option A: Rigor mortis refers to the stiffening of the body's muscles after death, caused by a lack of ATP, not discoloration.
Option C: Algor mortis is the process by which the body's temperature gradually cools to match the surrounding environmental temperature after death.
Option D: 'Stiff mortis' is not a recognized medical term. It is a distractor created to sound plausible by combining 'stiff' (related to rigor mortis) with the 'mortis' suffix.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Postmortem Changes as background academic context rather than a clinical decision trigger.
Nurses must be able to identify the signs of death, including livor mortis, to officially pronounce a death and provide appropriate postmortem care.
Proper positioning of the deceased, such as elevating the head with a pillow, is a key nursing intervention to prevent blood from pooling in the face and neck, which can be distressing for the family to see.
Understanding the timeline of these changes helps in estimating the time of death, which is crucial in certain clinical and forensic situations.

How to Approach the Question

First, identify the key concepts in the question stem: 'discolouration', 'dependent areas', and 'after death'.
Recall the three main physiological changes that occur after death: Algor mortis, Livor mortis, and Rigor mortis.
Associate each term with its meaning: 'Algor' relates to temperature/cold, 'Rigor' relates to stiffness/rigidity, and 'Livor' relates to a bluish or livid color.
Match the key concept 'discolouration' with the corresponding term, which is 'Livor mortis'.
Evaluate the other options to confirm they are incorrect. Rigor mortis is stiffness, Algor mortis is cooling, and 'Stiff mortis' is not a valid medical term.
This systematic process of elimination based on root meanings leads to the correct answer.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor pp. 946-948, 951-953

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