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A 78-year-old patient with a history of amyloidosis comes to the clinic for medication refill and follow-up. He has been working closely with a cardiologist as his condition is beginning to affect his cardiac function. He reports to feeling short of breath at times, particularly when walking his dog or climbing stairs. His last echocardiogram showed preserved ejection fraction. What phase of ventricular function is most affected by this patient’s condition?

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