The mps module #3710 on the bypass machine which had just returned from being serviced malfunctioned while on bypass.I was delivering my last dose of cardioplegia when this happened.My potassium packet had 25ml of potassium in it.I had my machine set at 2 meq/1.When i turned on the machine to deliver there was a delay before the automatic clamp opened.Once the automatic clamp opened, at 17:34, it immediately bolused the entire 25mls in to the cardioplegia circuit.That dose went into the patient and caused an extra 45 minutes on bypass while we had to wait for the potassium to wash out and the heart to return to a normal rhythm.
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