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Chapter 1: Problem 48

A patient presents to the emergency department with profound postural hypotension, hyponatremia, hyperkalemia, and his skin is darker than usual. Which of the following diagnostic tests should be carried out as soon as possible? a. baseline serum cortisol measurement b. plasma ACTH measurement c. urine free cortisol d. short ACTH stimulation test e. dexamethasone suppression test

Short Answer

Expert verified
d. short ACTH stimulation test

Step by step solution

01

Identify Key Symptoms

The patient presents with profound postural hypotension, hyponatremia, hyperkalemia, and darkened skin. These symptoms suggest possible adrenal insufficiency.
02

Understand the underlying condition

Adrenal insufficiency (Addison's disease) is indicated by the symptoms and typically involves low cortisol levels. To confirm this, diagnostic tests for adrenal function need to be considered.
03

Consider Each Test's Purpose

a. Baseline serum cortisol measures cortisol levels without stimulation.b. Plasma ACTH measures adrenocorticotropic hormone levels, which can differentiate between primary and secondary adrenal insufficiency.c. Urine free cortisol measures cortisol excreted in urine over a 24-hour period but is less immediate.d. Short ACTH stimulation test evaluates the adrenal glands' response to synthetic ACTH, useful for diagnosing adrenal insufficiency.e. Dexamethasone suppression test assesses the feedback mechanism of cortisol but is more relevant for Cushing's syndrome rather than adrenal insufficiency.
04

Select the Most Immediate and Relevant Test

To diagnose adrenal insufficiency quickly, the short ACTH stimulation test (d) should be carried out as soon as possible. This test directly assesses adrenal function and the capacity to produce cortisol under stimulation.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

postural hypotension
Postural hypotension, also known as orthostatic hypotension, is a significant drop in blood pressure when a person stands up from a sitting or lying position. Symptoms include dizziness, lightheadedness, and fainting. This condition can be caused by dehydration, prolonged bed rest, or it can be a sign of more severe issues such as adrenal insufficiency. When a patient experiences postural hypotension as a symptom of adrenal insufficiency, it is often due to a deficiency in aldosterone, which helps regulate blood pressure by balancing sodium and water levels.
hyponatremia
Hyponatremia occurs when sodium levels in the blood are abnormally low. This condition can arise from various causes, including excessive fluid intake, heart failure, or adrenal insufficiency. In the context of adrenal insufficiency, the lack of aldosterone and cortisol disrupts the sodium balance, leading to dilutional hyponatremia. Symptoms include nausea, headache, confusion, and severe cases can lead to seizures. Managing hyponatremia involves addressing the underlying cause, which may include hormone replacement if it is due to adrenal insufficiency.
ACTH stimulation test
The ACTH stimulation test is a critical diagnostic tool for evaluating adrenal gland function. During this test, synthetic ACTH (cosyntropin) is administered, and cortisol levels are measured before and after the injection. This helps determine if the adrenal glands are capable of producing an adequate cortisol response. In adrenal insufficiency, the cortisol levels will not rise sufficiently after ACTH administration. This test is preferred for its rapid assessment of adrenal function, allowing for prompt diagnosis and treatment.
Addison's disease
Addison's disease, or primary adrenal insufficiency, is a disorder where the adrenal glands do not produce enough hormones, specifically cortisol and aldosterone. Common symptoms include chronic fatigue, muscle weakness, weight loss, low blood pressure, and hyperpigmentation of the skin. It is often diagnosed through a combination of blood tests, including cortisol and ACTH levels, and confirmed with an ACTH stimulation test. Treatment involves lifelong hormone replacement therapy to replace the deficient hormones and manage symptoms effectively.

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Most popular questions from this chapter

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