Displaying publications 1 - 20 of 73 in total

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  1. Chong HL, Ong HC, Ang LT
    Med J Malaysia, 1974 Sep;29(1):44-53.
    PMID: 4282630
  2. Ong HC
    Acta Haematol., 1974;52(4):220-2.
    PMID: 4217527 DOI: 10.1159/000208244
    Haemoglobin E complicates 22.2°/o of pregnancy in Malaysian aborigines, the prevalence of variants associated with pregnancy being, 15.8% with Hb E trait abnormality, 3.9% with Hb E homozygous disease, and 2.5% with Hb E thalassaemia disease. Minor haematological abnormalities occur with the trait and homozygous conditions, though a more unfavourable response is expected with Hb E thalassaemia. Haemolysis is not a prominent feature and it is suggested that factors other than the haemoglobinopathic state
    probably accounts for any unfavourable response in pregnancy.
    Key Words: Haemoglobin E; Haemoglobinopathies; Haemolytic anaemias; Hb E thalassaemia; Malaysia; Pregnancy
    Study site: Hospital Orang Asli, Gombak, Selangor, Malaysia
  3. Ong HC, Chelvam P
    Med J Malaysia, 1975 Jun;29(4):299-301.
    PMID: 1196178
  4. Ong HC
    PMID: 1221499
    This study presents clinical observations in pregnancy made on aborigines of the deep jungle and "outside" populations. Migration out of the jungle results in lowered nutritional status as a result of low socio-economic status in the "outside" aborigine. This, together with food habits, increased family size and higher incidence of helminthic infestations, results in lower mean values of Hb, PVC and MCHC and a higher prevalence of anaemia in pregnancy in the migrant aborigine. A higher population density in the "outside" population resulting in frequent intermingling and increased chances of cross-contamination probably explains the increased vaginal bacterial growth in the "outside" Aborigine women. A higher prevalence of vaginal candidiasis in the "outside" aborigine woman is probably related to exposure to oral contraceptives and broad-spectrum antibiotics. On the other hand, better medical and obstetrical services become more readily available to the "outside" aborigine and this results in a favourable influence on perinatal health.
  5. Ong HC, Teo SP
    Med J Malaysia, 1976 Sep;31(1):42-5.
    PMID: 1023012
  6. Ong HC, Chan WF
    Singapore Med J, 1977 Jun;18(2):100-4.
    PMID: 929220
    Benign cystic teratoma of the ovary has a varied incidence, varying from 30 to 50 per cent of all benign ovarian tumours. This tumour tends to occur in the reproductive age group (20 to 40 years), and the majority of patients are married with children. About 40 per cent of patients are symptomless. Of those with symptoms, abdominal pain and mass are the commonest. Torsion is the most frequent complication encountered, and the presence of acute pain should make one suspect this complication. The tumour is bilateral in 10 to 20 per cent of patients. This high bilateral occurrence places a responsibility on the gynaecologist to inspect the opposite ovary in all cases of unilateral dermoid cyst of the ovary at the time of laparotomy. Germ·layer derivatives are predominantly ectodermal in origin, although both mesodermal and entodermal derivatives occur frequently.
  7. Ong HC, White JC, Sinnathuray TA
    Acta Haematol., 1977;58(4):229-33.
    PMID: 410224 DOI: 10.1159/000207832
    A case of haemoglobin H (HbH) disease associated with pregnancy is presented and discussed in the light of reports in the literature. The variable symptomatology is commented upon, although mild to moderate chronic haemolytic anaemia seems to be a constant feature. The roles of folic acid supplements and of splenectomy; the avoidance of oxidant drugs, and the mode of inheritance in HbH disease are briefly commented upon. Available reports indicate that HbH disease probably has no adverse effect on pregnancy. However, the association of the two conditions is uncommon, and reports are too few, therefore, to allow definite conclusions on the outcome in all instances.
  8. Ong HC, Chan WF, Sinnathuray TA
    Med J Malaysia, 1978 Mar;32(3):217-9.
    PMID: 683046
  9. Ong HC, Singh H, Ng TK, Chong CH
    Med J Malaysia, 1978 Mar;32(3):212-4.
    PMID: 683044
  10. Ong HC, Lee PYA, Ng TK, Chong CH
    Singapore Med J, 1978 Mar;19(1):33-6.
    PMID: 663681
    A retrospective analysis of 102 cases of hydatidiform moles seen in the Maternity Hospital, Kuala Lumpur, Malaysia, is presented. The incidence was 1 : 669. The tumour was more common In the Malays and in the lower social class patients. No specific age group or parity group was exempted. Vaginal bleeding and amenorrhoea were prominent features. Hyperemesis and abdominal cramps occurred less commonly. The uterine size was larger than dates in 62.7% of patients. Pre-eclampsia complicated 23.5% of the moles and Its severity was inversely related to the uterine size. Spontaneous abortion occurred In 57.8% of patients at a mean gestational period of 19 weeks.

    Study site: Maternity Hospital Kuala
    Lumpur, Malaysia
  11. Ong HC, Chan WF
    Cancer, 1978 Apr;41(4):1538-42.
    PMID: 639009
    A study of 207 benign ovarian tumors seen at the University Hospital, Kuala Lumpur between 1968 and 1975 was made to evaluate the clinical features that might be useful in the preoperative differentiation of mucinous cystadenoma, serous cystadenoma, and cystic teratoma of the ovary. This study indicated that the pertinent information included the mean age of the patient, the marital and menstrual status, and the estimated tumor size. The racial background was an additional factor in serous cystadenoma. Features like parity, the location of the tumor, and ABO blood group pattern were of no value in the preoperative differentiation.
  12. Ong HC, Puraviappan AP, Sinnathuray TA, Chong CH, Sen DK
    Singapore Med J, 1978 Jun;19(2):93-7.
    PMID: 751193
    Pregnancy was associated with cardiac disease in 0.94% of pregnancies. 0.66% with rheumatic lesions and 0.25'\'0 with congenital lesions. The Malays had a higher incidence than the Chinese and Indians. Most of the cardiac pregnancies were in patients between 20-30 years of age and gravida 1 to 4. Nevertheless. still about 30% of cardiac pregnancies were in patients 30 years and over in age and 20% in patient gravida 5 and above. Rheumatic lesions predominated. involving mainly the mitral valve. of which the major lesion was mitral stenosis. PDA. ASD and VSD were the major congenital lesions. Major antepartum matemal complications included arrhythmias. heart failure, anemia and pre-eclampsia. Of the arrhythmias. atrial fibrillation and sinus tachycardia occurred most commonly. A high incidence of prophylactic forceps and vacuum deliveries
    was evident. There was one matemal death. The majority of infants were bom alive and well.
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