What major adverse effect can hypokalemia have after cardiac surgery?

Hypokalemia, which is a lower than normal level of potassium in the blood, can lead to significant issues following cardiac surgery, including respiratory muscle weakness. Potassium is essential for proper muscle function, including the muscles involved in respiration. When potassium levels are insufficient, respiratory muscles may not function optimally, resulting in weakness. This can cause delays in extubation since the patient may struggle to breathe independently or effectively.

Proper respiratory function is critical following cardiac surgery, as patients often require mechanical ventilation initially to support their breathing. Weakness in the respiratory muscles can lead to prolonged reliance on these devices, which can complicate recovery and extend the hospital stay. Prompt recognition and correction of hypokalemia are vital to ensure a swift recovery and facilitate successful extubation.