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S/p arrest hyperkalemia cases almost never have an ECG that lacks all evidence of hyperkalemia unless it is multifactorial. Lack of terminal R-wave in aVR and V1, lack of right axis deviation, lack of bradycardia, lack of sinusoidal pattern, lack of peaked T-waves, lack of QRS prolongation. If your post arrest patient is lacking all of that, you can rest assured that they probably didn't arrest from severe hyperkalemia.
The ability of physicians to predict hyperkalemia from the ECG - PubMed
The ECG is not a sensitive method of detecting hyperkalemia, even in high-risk patients. The specificity of the ECG is better for hyperkalemia, but empiric treatment of hyperkalemia based on the ECG alone will lead to mistreatment of at least 15% of patients.
Can physicians detect hyperkalemia based on the electrocardiogram? - PubMed
An ECG is not a sensitive method of detecting hyperkalemia and should not be relied upon to rule it out. However, the ECG has a high specificity for detecting hyperkalemia and could be used as a rule in test.
Here’s a few studies that back up my last review of this that note though specificity of ekg findings can be helpful, sensitivity even in high k levels of ekg alone is garbage.
Can you back up your statement with some literature? That’s a specific population that’s difficult to study, and you’re making some very strong statements. Smells funny to me.
You have no idea what drugs were given from the prompt he gave. If they just gave calcium/bicarbonate (or a crapload of Epi) the ekg may be falsely normalized.
I agree with cath lab activation. I disagree that it is “definitely not” hyperk. That’s a difficult diagnosis to exclude without labs, and you ignore it at your peril.