P-wave widening is a description of ECG examination, suggesting that the P-wave time is greater than 0.12s, and left ventricular high voltage is also a description of ECG examination, suggesting that RV5+ SV1 voltage is increased. P-wave widening is defined as a p-wave time greater than 0.12s, often suggesting possible left atrial hypertrophy, and it is recommended to improve cardiac ultrasound and other tests to clarify the diagnosis. Left ventricular hypervoltage on electrocardiogram shows that RV5+ SV1 is more than 4.0mV in men and more than 3.5mV in women. Because left ventricular hypervoltage is often suggestive of left ventricular hypertrophy, but it can also be seen in normal people, so it can’t be diagnosed conclusively because electrocardiogram is only describing the waveform, and it is necessary to improve the cardiac ultrasound and other tests to make a clear diagnosis. If the ECG describes p-wave widening and high voltage in the left ventricle, it is recommended to consult a specialized cardiologist to see if treatment is needed.