The Correct Answer is D: In severe hypokalemia, potassium must be administered intravenously via a peripheral or central line
For severe hypokalemia (K+ <2.5-3.0 mEq/L), intravenous potassium replacement is required, and this can be safely administered through either peripheral or central venous access. This is the only correct statement among the options provided.
Analysis of Each Option
Option A: INCORRECT - Peaked T waves are NOT typical of hypokalemia
Peaked T waves (tenting) are characteristic of hyperkalemia, not hypokalemia 1, 2.
Hypokalemia produces the opposite ECG findings:
This is a critical distinction in clinical practice, as confusing these ECG patterns could lead to dangerous treatment errors.
Option B: INCORRECT - IV potassium is NOT required for mild-moderate hypokalemia
Oral potassium replacement is preferred for mild to moderate hypokalemia 3, 4, 5.
Intravenous potassium is reserved for:
- Severe hypokalemia (K+ <2.5-3.0 mEq/L)
- Symptomatic patients with cardiac arrhythmias
- ECG changes
- Inability to take oral medications
- Cardiac ischemia or digitalis therapy 3, 4
The guideline evidence emphasizes that oral replacement is appropriate for asymptomatic patients with less severe hypokalemia 5.
Option C: INCORRECT - Avoid glucose solutions for potassium administration
Administering potassium in 5% glucose solution is contraindicated because glucose stimulates insulin release, which drives potassium intracellularly and can paradoxically worsen hypokalemia 1.
The proper approach:
- Use saline-based solutions (0.9% NaCl or 0.45% NaCl) for potassium administration
- In DKA management, when glucose plus insulin is given together, this is a specific therapeutic maneuver to shift potassium into cells for hyperkalemia treatment 1, 6
Option D: CORRECT - Severe hypokalemia requires IV potassium via peripheral or central line
This statement is accurate. For severe hypokalemia with life-threatening manifestations (ventricular arrhythmias, marked muscle weakness, respiratory compromise), intravenous potassium replacement is mandatory 1, 4, 5.
Key management principles for severe hypokalemia:
- IV potassium can be administered through peripheral or central access
- Central access allows for higher concentration infusions when needed
- Peripheral administration is acceptable with appropriate concentrations and monitoring
- The AHA guidelines specifically address severe hypokalemia requiring slow infusion over hours 1
Critical caveat: The guidelines explicitly state that bolus administration of potassium for cardiac arrest is "unknown and ill advised (Class III, LOE C)" 1. Even in severe cases, potassium must be infused slowly.
Option E: INCORRECT - Continuous monitoring is NOT required for mild hypokalemia
Continuous ECG monitoring and frequent potassium measurements every 3-6 hours are only necessary for severe hypokalemia or when administering IV potassium 7, 4, 5.
For mild hypokalemia:
- Oral replacement is appropriate
- Routine monitoring is sufficient
- Frequency of follow-up depends on clinical context and underlying cause
The evidence shows that intensive monitoring (hourly heart rate, ECG monitoring for T-wave changes, electrolytes every 2-4 hours) is reserved for severe cases requiring ICU-level care 7, 6.
Clinical Pitfalls to Avoid
- Never confuse hyperkalemia and hypokalemia ECG findings - this could lead to fatal treatment errors
- Avoid glucose-containing solutions for potassium replacement as they worsen hypokalemia
- Do not give potassium boluses even in cardiac arrest - slow infusion is mandatory 1
- Check magnesium levels - hypomagnesemia commonly coexists and causes refractory hypokalemia 1, 8, 9
- Ensure adequate urine output before potassium administration to prevent hyperkalemia 6