A 35-year-old woman with severe anemia (hemoglobin 6 g/dL) due to chronic bleeding presents with palpitations and dyspnea on exertion. Vital signs: HR 110 bpm, BP 100/65 mmHg, RR 24/min. Cardiac examination reveals a hyperdynamic precordium with a systolic flow murmur. Echocardiography shows normal LVEF (55%) and normal valve function. Which compensatory mechanism is PRIMARILY responsible for maintaining cardiac output in this patient?

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