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Questions and Answers
ABP is associated with __________ due to decrease in stroke volume and heart rate.
ABP is associated with __________ due to decrease in stroke volume and heart rate.
hypotension
The systolic pressure increases due to the increase in __________ and cardiac output.
The systolic pressure increases due to the increase in __________ and cardiac output.
stroke volume
The diastolic pressure decreases due to __________ dilation.
The diastolic pressure decreases due to __________ dilation.
peripheral vasodilation
The pulse pressure increases due to the __________ in systolic and diastolic pressures.
The pulse pressure increases due to the __________ in systolic and diastolic pressures.
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The management of hypervolemia involves the __________ of fluids.
The management of hypervolemia involves the __________ of fluids.
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Study Notes
Regulation of ADH Secretion
- Increased plasma osmolarity by 1% stimulates ADH secretion
- Decreased plasma osmolarity inhibits ADH secretion
- Hypovolemia (↓ blood volume) stimulates ADH secretion, which increases blood pressure
- Hypervolemia (↑ blood volume) inhibits ADH secretion
- Certain drugs, such as morphine and nicotine, stimulate ADH secretion
- Polydipsia (excessive thirst) can keep a patient healthy by preventing dehydration
- Depressed thirst sensation, often caused by loss of consciousness, can lead to fatal dehydration
Syndrome of Inappropriate ADH Secretion (SIADH)
- Caused by increased ADH secretion from the posterior pituitary or an ectopic source, such as a malignant tumor (e.g. bronchogenic carcinoma)
- Manifestations of SIADH include:
- Water retention
- Hyponatremia (low sodium levels)
- Increased urine osmolarity
- Edema
- Hypotension (low blood pressure) due to decreased stroke volume and heart rate
- Increased systolic blood pressure due to increased stroke volume and cardiac output
- Decreased diastolic blood pressure due to peripheral vasodilation
- Increased pulse pressure
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Description
This quiz covers the regulation of Antidiuretic Hormone (ADH) secretion, including the factors that increase and decrease its secretion. Learn how osmolarity, blood volume, and certain drugs affect ADH levels.
