Certain changes in the electrocardiogram (ECG) are commonly associated with Noonan Syndrome. A particular patient may show additional changes depending on the cardiac abnormalities present.
ECG changes considered characteristic for Noonan Syndrome:
(1) QRS left axis deviation
(2) an abnormal R/S ratio in V6 (left precordium) associated with low R voltage
(3) abnormal Q wave (voltage greater than normal and/or wider than 0.04 s)
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