The diagnosis, and in many centres the surgical correction, of congenital heart disease is now commonplace. Several large series, both clinical and post-mortem, reporting the relative incidence of the various cardiac anomalies have now been published. Further, attempts have been made to estimate the absolute incidence of such anomalies in given populations, e.g. McMahon et al. (1953) in Birmingham and Carlgren (1959) in Gothenburg. Such data, in the main, relate to temperate climes, and to persons of Caucasian stock. Elsewhere little attention has been paid to such defects and ". . . there is little published work on the incidence of congenital malformations of the heart in tropical and sub-tropical areas . . ." (Williams and Simpkiss, 1958).This paper describes and classifies, from a morbid anatomical viewpoint, the 411 cases of congenital heart disease seen in 19,415 consecutive unselected necropsies performed at the General Hospital, Singapore, in the decade 1948-57.
METHOD AND MATERIALThe data considered relevant were extracted from the post-mortem protocols and entered on specially prepared forms for subsequent analysis. As 17 per cent of the necropsies in this series were performed at the request of H.M. Coroner on children found dead, and as many of those admitted to the wards died less than four hours after admission, no attempt has been made to record clinical data.Singapore is a multiracial city. While theoretically one might expect that the post-mortem figures for a particular disease would reflect, by and large, the relative racial frequencies (Chinese 76.5%, Indians 8%, Malays 12%, and others 3.5%. in the 1957 census) in this series of 411 cases, 400 (97%/) were of Chinese race, 10 (2.4%) were of Indian stock, and 1 was a Malay, an absolute and relatively overwhelming preponderance of Chinese.If one examines, by race, the number of necropsies performed in Singapore, there is again an undue relative preponderance of Chinese, as the bodies of many Chinese children dying in hospital are not claimed and come to autopsy, as it were, by default. Further, for religious and other reasons it is much more difficult to obtain permission to examine the bodies ofIndians and Malays. Thus, although the data in this paper relate mainly to the Chinese population; it cannot be assumed that the incidence in Chinese is higher than in other races.The relative incidence of the lesions is shown in