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Table 5 HHS classification according to the hand malformations

From: Clinical and epidemiological features of heart-hand syndrome, an updated analysis in China

Type

Subtypea

 
 

a

b

%

Type1 Thumb type (thumb hypoplasia, thumb duplication, triphalangeal thumb, et al)

113

8

60.5%

Type2 Finger type (syndactyly, brachydactyly, symbrachydactyly, et al)

45

8

26.5%

Type3 Contracture type (single or multiple congenital joint contractures)

22

3

12.5%

Type4 Rare type (could not classify into malformations mentioned above)

1

0

0.5%

  1. aSubtype a: an abnormal heart structure was discovered by ultrasonic cardiogram, associated with normal EGC or abnormal ECG. Subtype b: only abnormal result of ECG was discovered