What is a common first step if potassium levels are dangerously high?

The first step when potassium levels are dangerously high is to assess heart rate and rhythm. This is crucial because hyperkalemia can lead to significant cardiac complications, including arrhythmias and even cardiac arrest. Monitoring the heart's activity allows the healthcare provider to identify any immediate threats to the patient's cardiac stability.

Understanding the heart rate and rhythm helps guide further interventions. For instance, if the heart shows signs of distress, immediate treatment can be initiated to stabilize the heart and lower potassium levels. This assessment is vital before proceeding with other interventions, as it directly impacts patient safety and treatment efficacy.

Other options, while relevant in the management of hyperkalemia, do not precede the critical assessment of the patient's cardiac status. Starting dialysis or administering sodium bicarbonate may be necessary later, but they should occur only after understanding the patient’s current rhythm and any potential cardiac compromise that requires immediate attention. Providing potassium supplements would be contraindicated in this situation as it would further elevate potassium levels.