In a dog with congestive heart failure due to systolic dysfunction, which management step is commonly used to reduce preload?

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Multiple Choice

In a dog with congestive heart failure due to systolic dysfunction, which management step is commonly used to reduce preload?

Reducing preload is about pulling excess fluid out of the body to lessen the volume returning to the heart. In a dog with congestive heart failure from systolic dysfunction, preload drives the pulmonary and systemic venous congestion that causes coughing, dyspnea, and edema. Diuretics do exactly that: they promote natriuresis and diuresis, lowering blood volume and venous pressures, which reduces ventricular filling pressures at the end of diastole. By decreasing preload, they relieve fluid-backed up areas like the lungs and improve breathing and comfort. This is why diuretics are the go-to step for preload reduction in this situation. Other options don’t target preload as effectively. A high-salt diet would push fluid retention and increase preload, worsening symptoms. NSAIDs can impair kidney function and promote sodium and water retention, again increasing preload. ACE inhibitors mainly reduce afterload through vasodilation; while they can have some venous effects, their primary clinical use is afterload reduction and remodeling rather than direct preload lowering.

Reducing preload is about pulling excess fluid out of the body to lessen the volume returning to the heart. In a dog with congestive heart failure from systolic dysfunction, preload drives the pulmonary and systemic venous congestion that causes coughing, dyspnea, and edema. Diuretics do exactly that: they promote natriuresis and diuresis, lowering blood volume and venous pressures, which reduces ventricular filling pressures at the end of diastole. By decreasing preload, they relieve fluid-backed up areas like the lungs and improve breathing and comfort. This is why diuretics are the go-to step for preload reduction in this situation.

Other options don’t target preload as effectively. A high-salt diet would push fluid retention and increase preload, worsening symptoms. NSAIDs can impair kidney function and promote sodium and water retention, again increasing preload. ACE inhibitors mainly reduce afterload through vasodilation; while they can have some venous effects, their primary clinical use is afterload reduction and remodeling rather than direct preload lowering.

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