A nurse is performing a complete physical examination on a patient. After examining the patient with the Snellen chart, the nurse documented distance vision in both eyes 20/40. The patient asks the nurse what 20/40 means:

20 represents the distance you are placed from the chart and 40 represents the distance a normal eye read the chart.

20 represents the distance a normal eye can read and 40 represents the distance your eye read the chart.

20 represents the distance you are placed from the chart and 40 represents the distance your eye read the chart.

40 represents the distance you are placed from the chart and 20 represents the distance a normal eye read the chart.

Answer and Explanation

The Correct Answer is A

A. 20 represents the distance you are placed from the chart and 40 represents the distance a normal eye reads the chart:

This is correct. The first number (20) represents the distance in feet the patient is from the Snellen chart. The second number (40) indicates the distance at which a person with normal vision can read the same line. Therefore, 20/40 means that what the patient can read at 20 feet, a person with normal vision can read at 40 feet.

B. 20 represents the distance a normal eye can read and 40 represents the distance your eye reads the chart:

This is incorrect. The first number should represent the distance the patient is from the chart, not the normal eye's reading distance.

C. 20 represents the distance you are placed from the chart and 40 represents the distance your eye reads the chart:

This is incorrect. While the first number is correct (the distance from the chart), the second number should represent the distance a person with normal vision can read the same line, not the patient's distance.

D. 40 represents the distance you are placed from the chart and 20 represents the distance a normal eye reads the chart:

This is incorrect. The standard for visual acuity measurements is that the first number represents the testing distance (usually 20 feet), and the second number represents the distance at which a normal eye can read the line.

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Correct Answer is C

Explanation

A. Nail Beds:

While peripheral cyanosis can cause bluish discoloration of the nail beds, central cyanosis is more indicative of systemic hypoxemia and is best assessed in areas with rich blood supply, such as the oral mucosa.

B. Sclera:

The sclera is more commonly used to assess for jaundice (yellowing) rather than cyanosis. Cyanosis is not typically visible in the sclera.

C. Oral Mucosa:

Central cyanosis is most accurately assessed in areas with high vascularization, such as the oral mucosa. This area provides a clear indication of oxygenation status and can reveal hypoxemia more reliably than peripheral sites.

D. Palms:

Similar to the nail beds, the palms can show signs of peripheral cyanosis but are not the primary site for assessing central cyanosis. The oral mucosa remains the best site for this assessment.

A. Dysphagia B. gingivitis C. aphthous ulcers. D. Hypothyroidism

Correct Answer is D

Explanation

A) Dysphagia:

Dysphagia refers to difficulty swallowing and is typically associated with conditions affecting the esophagus or neuromuscular function. While it can coexist with other symptoms, it does not directly explain hoarseness, fatigue, and weight gain as hypothyroidism does.

B) Gingivitis:

Gingivitis is an inflammation of the gums due to plaque buildup. It primarily affects oral health, causing redness, swelling, and bleeding of the gums. It is not associated with systemic symptoms like hoarseness, fatigue, or weight gain.

C) Aphthous ulcers:

Aphthous ulcers, also known as canker sores, are small, painful lesions that develop in the mouth. They are typically caused by stress, minor injury, or certain foods. These ulcers do not explain the systemic symptoms described by the client.

D) Hypothyroidism:

Hypothyroidism is a condition where the thyroid gland does not produce enough thyroid hormones. Symptoms include hoarseness, fatigue, weight gain, dry skin, and cold intolerance. The combination of these symptoms in the client's history makes hypothyroidism the most likely cause.

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A nurse is performing a complete physical examination on a patient. After examining the patient with the Snellen chart, the nurse documented distance vision in both eyes 20/40. The patient asks the nurse what 20/40 means:

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During assessment, the nurse would expect which part of the body to indicate central cyanosis in a client with a severe asthma attack?

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Correct Answer is D

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A nurse is performing a complete physical examination on a patient. After examining the patient with the Snellen chart, the nurse documented distance vision in both eyes 20/40. The patient asks the nurse what 20/40 means: