![](https://static.wixstatic.com/media/f58279_6cd54e47736b49b8904116d02918d28a~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/f58279_6cd54e47736b49b8904116d02918d28a~mv2.jpg)
![Normal 12-Lead ECG](https://static.wixstatic.com/media/f58279_6cd54e47736b49b8904116d02918d28a~mv2.jpg/v1/fill/w_320,h_240,fp_0.50_0.50,q_90,enc_auto/f58279_6cd54e47736b49b8904116d02918d28a~mv2.jpg)
Normal 12-Lead ECG
This ECG is nearly completely normal. We say "nearly" because there are VERY subtle changes which may or may not be chronic. ...
![](https://static.wixstatic.com/media/f58279_2d42a377c6a84cf0b4e9289036354204~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/f58279_2d42a377c6a84cf0b4e9289036354204~mv2.jpg)
![Wide-complex Tachycardia: Ventricular Tachycardia](https://static.wixstatic.com/media/f58279_2d42a377c6a84cf0b4e9289036354204~mv2.jpg/v1/fill/w_320,h_240,fp_0.50_0.50,q_90,enc_auto/f58279_2d42a377c6a84cf0b4e9289036354204~mv2.jpg)
Wide-complex Tachycardia: Ventricular Tachycardia
This ECG is from a man who was experiencing palpitations and light-headedness with near-syncope. On first look, you will see a...
![](https://static.wixstatic.com/media/f58279_350e06c46a6547499037e613898b1d54~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/f58279_350e06c46a6547499037e613898b1d54~mv2.jpg)
![Wide Complex Bradycardia in Digitalis Toxic Patient](https://static.wixstatic.com/media/f58279_350e06c46a6547499037e613898b1d54~mv2.jpg/v1/fill/w_320,h_240,fp_0.50_0.50,q_90,enc_auto/f58279_350e06c46a6547499037e613898b1d54~mv2.jpg)
Wide Complex Bradycardia in Digitalis Toxic Patient
This ECG is from a female patient who presented with weakness. Her labs revealed digitalis toxicity and hyperkalemia. Actual lab values...
![](https://static.wixstatic.com/media/f58279_aa48100e28be4b56929f313a72158b78~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,lg_1,q_30,blur_30,enc_auto/f58279_aa48100e28be4b56929f313a72158b78~mv2.jpg)
![Deep, Symmetrical T Wave Inversions](https://static.wixstatic.com/media/f58279_aa48100e28be4b56929f313a72158b78~mv2.jpg/v1/fill/w_320,h_222,fp_0.50_0.50,q_90,enc_auto/f58279_aa48100e28be4b56929f313a72158b78~mv2.jpg)
Deep, Symmetrical T Wave Inversions
This ECG is from a 50-year-old man with chest pain. Unfortunately, we don’t have any other clinical information. This tracing is a...
![](https://static.wixstatic.com/media/f58279_cab17f54884145feb4bd4c6db11467c8~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/f58279_cab17f54884145feb4bd4c6db11467c8~mv2.jpg)
![Atrial Flutter](https://static.wixstatic.com/media/f58279_cab17f54884145feb4bd4c6db11467c8~mv2.jpg/v1/fill/w_320,h_240,fp_0.50_0.50,q_90,enc_auto/f58279_cab17f54884145feb4bd4c6db11467c8~mv2.jpg)
Atrial Flutter
This nice example of atrial flutter offers many teaching opportunities. "Sawtooth" flutter waves are readily visible in Leads II, III,...
![](https://static.wixstatic.com/media/f58279_4d9387bb4f084e7d8a3370bb9154d6a9~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/f58279_4d9387bb4f084e7d8a3370bb9154d6a9~mv2.jpg)
![Wolff-Parkinson-White Syndrome](https://static.wixstatic.com/media/f58279_4d9387bb4f084e7d8a3370bb9154d6a9~mv2.jpg/v1/fill/w_320,h_240,fp_0.50_0.50,q_90,enc_auto/f58279_4d9387bb4f084e7d8a3370bb9154d6a9~mv2.jpg)
Wolff-Parkinson-White Syndrome
Here is a good example of an ECG showing the signs of Wolff-Parkinson-White syndrome during normal sinus rhythm. WPW is one of the...