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ECG Basics | ECG Review | ECG Archive | ECG Cases | ECG Quizes ECG Case #3 A 23 year old female 1st year medical student presents to the emergency room with altered mental status. Her friends say she has been drinking hard liquor non-stop for 1 week after her final exams and has not been eating well for months. She was recently started on erythromycin for a upper respiratory tract infection. Her temperature is 37.0, blood pressure 90/50, heart rate 70, respiratory rate 10. She is thin and cachectic appearing. She is arousable but unable to answer questions or follow commands. Her heart and lung exam are normal. Her laboratory studies reveal a potassium level of 2.1 (normal 3.5-5.0), a magnesium level of 0.9 (normal 1.8-3.0), and a calcium level of 5.0 (normal 9.0-10.5). Her ECG is below: After a few hours in the emergency room, she becomes completely unresponsive and the monitor reveals the below rhythm: Question #1 What are the ECG #1 findings? Question #2 What rhythm is seen on the ECG #2 rhythm strip? Question #3 What predisposed her to the above ECG anormalities and rhythms? What are other causes of a long QT interval? Question #4 What would be the treatment indicated in the above case? Question #5 What is the best way to estimate the QT interval on ECG? What is the equation for QTc? 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 |
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