n Cardiovascular Journal of South Africa - The William Nelson ECG Quiz




Extracted from text ... The William Nelson ECG Quiz The answer is provided on page 80. This is the ECG of an 81-year-old woman Why variable QRS complexes? The William Nelson ECG Quiz Answer There is a supraventricular tachycardia of 165/min (uncertain origin) with a frontal plane axis of (+)145 degrees. The precordial leads show LVH and this, plus right axis deviation, makes the diagnosis of biventricular hypertrophy a definite possibility. Back to the question posed: The V1 rhythm strip shows the cyclical oscillation of a 'dyspnea pattern'. But, note also that there is variation in QRS amplitude consistent with electrical alternans - demanding ..


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