Objective To analyze the electrocardiographic diagnosis process of hypertrophic cardiomyopathy in different hypertrophic sites. Methods A total of 63 patients with hypertrophic cardiomyopathy collected in our hospital from Ma

y 2014 to May 2018 were selected

and the patients were classified into apical hypertrophy

apical mixed type

and ventricular septum based on the specific hypertrophy location of the affected area.Hypertrophic type and ventricular septal mixed type

the electrocardiograms of these four types were compared and their characteristics were analyzed. The former two were merged into the apical hypertrophy group

and the latter two were merged into the ventricular septal hypertrophy group

and the difference between the two electrocardiograms was tested. Results The ECG in the apical hypertrophy group was prone to show inverted T waves centered on T

V4

in leads I

V

3

～V

6

and a VL（100%

87.5%

38.5%

50.0%

p

<

0.05） or in V

3

～V

5

. A giant inverted T wave with T

V4

as the axis in lead V

5

（50%

37.5%

0

0

p

<

0.05）; and an upright R wave with RV4as the axis can be seen in the same lead. Mixed apical ECG is easy to see R wave>2.5mV in the precordial leads

that is

left ventricular high voltage（37.5%

75%

23.1%

26.9%

p

<

0.05）; all three types except apical hypertrophy are prone to QRS notch appeared in leads Ⅲ and a VF（0

37.5%

53.8%

38.5%

p

<

0.05）;ventricular septal hypertrophy was prone to prolongation of QTc interval（37.5%

25%

53.8%

34.6%

p

<

0.05）

the mean interval was the longest（469.9±39.8） ms; the mixed type of ventricular septum was prone to have deep but wide pathological Q waves in leads I

Ⅲ

aVL

aVF and leads V

5

and V

6

（0

12.5%

7.7%

46.1%

p

<

0.05）.Conclusions The patient’s ECG showed that the inverted T wave in the left precordial leads may indicate apical hypertrophy; the left ventricular high voltage and QRS notch in inferior leads may indicate mixed apical type.Deep but wide pathological Q waves in the inferior

left anterior

or lateral leads may suggest a mixed septal pattern. The different ECG characteristics of patients with hypertrophic cardiomyopathy can reflect the different locati

on of hypertrophy in the affected area

and can make a more accurate prediction of the specific type of hypertrophic cardiomyopathy.