Blue discoloration of the skin and mucus membrane is called:

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2020

Explanation

Cyanosis is the specific medical term for the bluish discoloration of the skin and mucous membranes.
This sign indicates an increased concentration of deoxygenated hemoglobin in the blood vessels near the skin's surface.
It becomes clinically apparent when the level of deoxygenated hemoglobin exceeds 4-5 g/dL in the capillary blood.
It is a key sign of compromised oxygenation that requires prompt nursing assessment.

Option A: Hypoxia is the underlying physiological condition of insufficient oxygen reaching the tissues. It is the cause, not the sign itself. Cyanosis is the visible sign of severe hypoxia.
Option C: Anorexia is the medical term for a loss of appetite. It is related to the gastrointestinal system and nutritional status, not oxygenation or skin color.
Option D: Wheezing is a high-pitched whistling sound heard during breathing, caused by narrowed airways. It is an adventitious breath sound, not a change in skin color.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition of Cyanosis as background academic context rather than a clinical decision trigger.
The appearance of cyanosis is a critical assessment finding that signals potentially life-threatening hypoxemia, requiring immediate further assessment and intervention.
Nurses must quickly differentiate between central cyanosis (affecting mucous membranes, a sign of systemic hypoxia) and peripheral cyanosis (affecting extremities, often due to poor circulation or cold). Central cyanosis is a more ominous sign.
In patients with dark skin, cyanosis can be difficult to detect. The nurse should assess for a dusky or ashen color in the mucous membranes, such as the conjunctiva, tongue, and oral mucosa, as these areas show changes more reliably.

How to Approach the Question

This is a factual recall question that asks for the definition of a medical term.
First, identify the key phrase in the question stem: 'Blue discoloration of the skin and mucus membrane'.
Next, evaluate each option to determine which one directly matches this definition.
Eliminate options that describe unrelated concepts. 'Anorexia' is about appetite, and 'Wheezing' is a breathing sound.
Differentiate between the remaining related terms. 'Hypoxia' is the condition of low oxygen, while 'Cyanosis' is the visible sign of that condition. The question asks for the name of the discoloration (the sign).
Therefore, 'Cyanosis' is the most precise and correct term for the described sign.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 1 p. 319-321

E6 Nursing Fundamentals Potter Perry 12e Part 4 p. 234-236

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