What is the meaning of ptosis?

Appeared in: DSSSB 12 August 2024

Explanation

Ptosis is the medical term for the drooping or falling of an upper eyelid of one or both eyes.
The term is derived from the Greek word 'ptosis', meaning 'fall'. It is also known as blepharoptosis.
This condition can range from a slight droop that is barely noticeable to a severe droop that covers the pupil and obstructs vision.
It is not a disease itself but a sign of an underlying condition, which can be mechanical, neurological, or muscular in origin.

Option A: Patchy blindness, or scotoma, refers to a defect in the visual field. It is a problem with vision perception, not the physical structure of the eyelid.
Option C: Optic nerve dystrophy is a degenerative disease of the optic nerve itself, leading to vision loss. It does not cause the eyelid to droop.
Option D: Oedema of the optic disc is known as papilledema. It is a swelling of the optic nerve head due to increased intracranial pressure and is a sign of a serious underlying condition, but it does not involve the eyelid.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Medical terminology related to ocular and neurological disorders as background academic context rather than a clinical decision trigger.
A nurse's assessment of ptosis is crucial as it can be a key indicator of serious underlying neurological conditions such as myasthenia gravis, Horner's syndrome, or a third cranial nerve (oculomotor) palsy.
Ptosis that fluctuates, worsening with fatigue or throughout the day, is a classic sign of myasthenia gravis, a neuromuscular junction disorder requiring specific medical management.
What if? If a patient presents with sudden onset of ptosis, a dilated pupil, and an eye that is deviated 'down and out', the nurse must recognize this as a potential third cranial nerve palsy, which could be caused by a brain aneurysm. This is a medical emergency requiring immediate escalation.

How to Approach the Question

This is a factual recall question that tests your knowledge of a specific medical term.
First, identify the keyword in the question, which is 'ptosis'.
Recall the definition of this term. The root 'ptosis' in Greek means 'to fall'.
Evaluate each option to determine which one accurately describes a 'falling' or 'drooping' structure related to the eye.
Option A (blindness) relates to vision, not structure. Option C (dystrophy) and D (oedema) relate to the optic nerve and disc, not the eyelid.
Conclude that 'Drooping of the eyelids' is the only option that matches the definition of ptosis.

Concept Tested & Keywords

Concept Tested: Medical terminology related to ocular and neurological disorders.
Stem keywords: ptosis, meaning
Lead-in keywords: What is

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E6 Medicine Harrison 22e Part 1 p. 275-277

E6 Medicine Davidson Principles Practice 24e p. 1111-1113

Practise the full DSSSB 12 August 2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.