A slightly confused but conscious 61-year-old female patient with generalized weakness has a heart rate of 190 beats/min. She has a history of high blood pressure and diabetes. Her blood pressure is 78/56 mmHg, and she has a pulse oximetry reading of 93%. Which disturbance would best explain this patient's presentation?

Pathophysiology is a medical science that studies how diseases affect the body's systems. It combines the study of pathology (the causes and effects of disease) and physiology (how the body's systems function).

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