Now let me search the medical library for ECG changes in common heart diseases, running multiple parallel searches.

Good - I found key cardiology textbooks. Now let me search specifically in the cardiology and Harrison's books for ECG sections.

Excellent! Now let me read key ECG sections from Guyton and Harrison's, and also look for ECG images across the textbooks.

Now let me read the major ECG content sections from Guyton & Hall and Braunwald's, and search for more ECG images.

Now let me read more content from Guyton and Harrison's for MI ECG, and search for hypertrophy, WPW, long QT, and other disease ECGs.

I have enough rich content now. Let me read the crucial sections from Guyton's ECG chapter covering MI, AV blocks, and key arrhythmias, plus get the Harrison's ECG section.

I have extensive material now. Let me read the MI ECG section from Guyton's and fetch the key ECG images simultaneously.

Now let me fetch more ECG images - the AV block, MI, and other key ones:

Excellent! I have torsades de pointes/Long QT and all the key information. Let me fetch a few more critical ECG images now:

Now let me get the torsades/Long QT ECG image, the MI ECG images, and the ventricular fibrillation image:

Now let me fetch the ventricular fibrillation ECG and the MI ECG images:

Let me get the VF ECG image and the MI ECG image quickly:

I now have comprehensive material from the textbooks. Let me also get the atrial flutter ECG image from Guyton's:

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