https://www.vetsurgeon.org/f/clinical-questions/19876/large-t-waves-cat-ecg Greetings hive mind I have an eCG for peoples perusal. This is from an 8month old cat who came in for spay, her preGA check was AOK (v nervous cat), surgery itself was fine, and heart rate stable, but we got these abnormal large t-waves from mid open-USTelligent Community 10https://www.vetsurgeon.org/thread/120374?ContentTypeID=1Fri, 05 Sep 2014 21:40:31 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:d1f6162f-b250-4783-a39d-ed4375aba5e6Anonymous<p>I agree, the 3rd complex is a premature one. The size of the T-wave would not worry me because the cat was under GA and I wonder how representative that would be of the T-wave size (an anaesthesiologist might disagree?)? But what would worry me is the ascending ST segment. As said, this could be a sign of myocardial hypoxia during the GA. I would at least repeat the ECG after 48hrs at the postOP check. I assume recovery was uneventful?</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/119369?ContentTypeID=1Mon, 18 Aug 2014 11:06:16 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:a80ee867-4fd1-4f1e-bcd5-1e5a1256a3b8Martin Atkinson<p>This is very worrying to me especially given the murmur that you have an underlying cardiomyopathy although it may to anoxia during the surgery its still of concern. I don&#39;t think these are T waves they I think &nbsp;are extra systoles/VPCs which may obscure the T wave but there appears to be a T wave occurring after the VPC. There is no P wave before the 3rd complex or at least it is obscured by one of these aberrant waves. The saw-tooth pattern on the ascending slope of the this wave is also odd given there is no obvious AC interference in the rest of the trace. This cat needs some further investigations IMO, minimum repeat ECG, thoracic X-ray and possibly NTpro-BNP, then echocardiography. </p> <p>Someone who knows more than me may be along soon but this shouldn&#39;t be ignored.</p><div style="clear:both;"></div>