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Monitoring electrolytes in a patient recovering from cardiac arrhythmias due to a crush injury is crucial because crush injuries can lead to significant physiological changes. The release of intracellular potassium, phosphate, and other electrolytes into the bloodstream can occur when muscle tissue is damaged. This leakage can result in hyperkalemia (high potassium levels), which is particularly dangerous as it can further exacerbate cardiac arrhythmias.

Electrolytes, especially potassium, calcium, and magnesium, play critical roles in maintaining proper cardiac function and rhythm. Any disturbances in their levels can directly influence the heart's electrical activity and increase the risk of arrhythmias. As such, regular monitoring of these electrolyte levels allows for timely intervention to correct any imbalances, thereby reducing the likelihood of complications.

In this context, the other monitoring options, while important in specific scenarios, would be less critical for the immediate management of arrhythmias that could arise from a crush injury. Blood glucose levels may be monitored for other reasons, such as stress response or existing diabetes, but are not directly related to arrhythmias resulting from electrolyte imbalance. Respiratory rate and hemoglobin levels are important in broader patient management but do not specifically address the immediate risks associated with cardiac arrhythmias in this situation.