Identify the condition:

Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Medical & Surgical Nursing

Easy

Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Explanation

The correct diagnosis is Differential Cyanosis, which is defined by cyanosis affecting the lower half of the body but not the upper half.
The image clearly demonstrates this pattern, with visibly cyanotic (blue) feet and toes, while the hands appear pink and well-perfused.
This specific presentation is a hallmark sign of a right-to-left shunt through a patent ductus arteriosus (PDA) with pulmonary hypertension.
In this condition, deoxygenated blood from the pulmonary artery enters the descending aorta (which supplies the lower body), while oxygenated blood from the left ventricle supplies the upper body.

Option B: Central cyanosis involves a bluish discoloration of the entire body, including warm areas like the mucous membranes of the mouth and tongue. The image only shows cyanosis in the lower extremities.
Option C: Peripheral cyanosis is caused by reduced blood flow to the extremities, often due to cold exposure or low cardiac output. It typically affects all four limbs, and the mucous membranes remain pink. The image shows a distinct difference between the upper and lower limbs, which is not typical for peripheral cyanosis.
Option D: This is a non-specific, general term. While differential cyanosis is a type of cyanosis affecting the extremities, 'Differential Cyanosis' is the precise medical term for the specific pattern shown in the image.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification and pathophysiology of different types of cyanosis based on clinical presentation as background academic context rather than a clinical decision trigger.
Recognizing differential cyanosis is a critical nursing assessment skill, as it signals a significant underlying congenital heart defect with pulmonary hypertension.
This finding requires immediate reporting and urgent cardiological evaluation, as it indicates severe hemodynamic compromise.
A key nursing intervention is to perform a four-limb blood pressure and pulse oximetry check. A significant difference in oxygen saturation (typically greater than 3-5%) between the right hand (pre-ductal) and a foot (post-ductal) can confirm the diagnosis.

How to Approach the Question

First, analyze the image carefully. Observe the color of the skin in all visible areas, specifically the hands and feet.
Note the key finding: the feet are blue (cyanotic), but the hands are pink.
This pattern of localized cyanosis is the central clue. The term for this is 'differential' cyanosis, meaning it differs between body parts.
Evaluate the given options based on this observation.
Recall the definitions: Central cyanosis is generalized (including mucous membranes), and peripheral cyanosis is usually in all extremities due to poor circulation.
Select 'Differential Cyanosis' as it is the most precise term that describes the specific clinical sign shown in the image.

Concept Tested & Keywords

Concept Tested: Identification and pathophysiology of different types of cyanosis based on clinical presentation.
Stem keywords: Identify the condition, cyanosis, hands, feet
Lead-in keywords: Identify
Clinical cues: Bluish discoloration of feet and toes.
Clinical cues: Normal pink color of hands and fingers.

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