Coronary atheroma is the principal cause of ischaemic heart disease. Among the factors considered to predispose to atheroma formation is raised plasma cholesterol and although it is regarded as a minor risk factor by some, others see its contribution as one of major importance. Whichever the view, the debate on plasma cholesterol and coronary heart disease (CHD) has long moved out of the exclusive domain of the scientific journal to the public arena and is reflected in the increasing frequency with which doctors are consulted by patients on the subject. The incidence of CHD in South-East Asian countries is also rising. For the practising clinician, the problem resolves itself into deciding if the evidence incriminating plasma cholesterol as a predisposing factor is strong enough, and if it is, what prophylactic and therapeutic steps are of value in reducing the incidence of CH D. An updated and brief review of lipid metabolism and the relationship of lipids to CHD is now necessary in view of the rapid accumulation of data from recent trials and prospective studies.
Fasting serum specimens from (a) 217 male and 46 female patients with coronary artery disease (CAD), aged 35-75 years, who had undergone angioplasty (PTCA) / coronary artery bypass graft (CABG), and (b) 160 apparently healthy controls (106 males, 54 females, aged 30-75 years), were assessed for serum lipid profile. Both sex and ethnicity significantly influenced the levels of serum high density lipoprotein cholesterol (HDLC); in the controls, females had higher HDLC levels than males (46.7 mg/dl vs 38.5 mg/dl, p
The objective of this study was to determine the levels of knowledge, attitudes and practices with regards to coronary heart disease (CHD) and its risk factors among CHD patients in the Institut Jantung Negara (National Heart Institute), Kuala Lumpur. All patients admitted for CHD during the study period between 5th May 1997 and 24th May 1997 were included in the study. A total of 105 patients were interviewed by using a pretested questionnaire. Four CHD risk factors were included in the study, namely dietary intake, smoking habit, alcohol intake and physical activity. The majority of the patients (92.4%) were above 45 years old. Most of them (85.7%) had at least one chronic health problem such as diabetes mellitus and hypertension before admission into IJN. Their average total blood cholesterol was 6.1 ± 1.3 mmol/L and 75.2% were hypercholesteromic (≥ 5.2 mmol/L). Mean systolic blood pressure was 151.2 ± 27.5 mmHg. The mean body mass index of the patients was 25.9 ± 3.9 kg/m2 and 58.1% were overweight (BMI ≥ 25.0). Almost half of the patients (49.6%) had smoked before but only 8.6% still smoke. Out of the 56 non-Muslim patients, 9 of them (16.1%) consumed alcoholic drinks on a regular basis. Most of the patients reported walking as the only form of exercise that they do. Most of the patients consume rice, vegetables and fruits almost daily. This study indicated significant relationships between (i) knowledge level and attitude towards CHD risk factors (r = 0.624, p < 0.001), (ii) knowledge level and modifying practices related to CHD risk factors (r = 0.316, p < 0.01) and (iii) attitude and modifying practices (r = 0.234, p
Coronary Heart Disease (CHD) is recognised as an important public health problem in Malaysia. Hyperlipidaemia is one of the main risk factors related to CHD. The mainstay of treatment is diet therapy which should be maintained even if drug treatment is indicated. Since dietitians are the primary providers of dietary treatment to hyperlipidaemic patients, this retrospective study attempts to report the dietary approaches and methodologies adopted by Malaysian dietitians in managing their patients. A postal questionnaire covering various aspects of dietary management of hyperlipidaemia were sent to 47 dietitians practicing in private and government hospitals. A response rate of 53 % was elicited. The survey found that there was a disparity amongst the respondents in the approach to the dietary management of hyperlipidaemia in Malaysia. This was largely due to the absence of a standardised dietary protocol for general lipid lowering in patients with hyperlipidaemia.
Study site: Private and public hospitals in Malaysia
New knowledge on the pathogenesis of the acute coronary syndromes provides the clinician with a better understanding of these important, often life-threatening, events and opens up new ways of managing them. The identification of the vulnerable plaque whilst important and possible pathologically still requires elaborate and often invasive methods. The central role of inflammation and the platelets in these syndromes has already been translated into practical therapeutics. Identifying and predicting which plaque would rupture and thereby facilitating the formation of an acute obstructive thrombus continue as major challenges to the clinician, but, in the meantime, regressing and stabilising these plaques are achievable goals.
In confronting the advances in the new treatment for incurable illnesses there is an increasing need for doctors to be aware of their patients' cognition and feeling related to their quality of life (QOL). Recognizing this need the authors translated and pilot tested the WHOQOL-100, a genuinely international measure of QOL by the World Health Organization (quality of life group). The WHOQOL-100 Malay version was pilot tested on 50 healthy controls and 250 ill subjects, suffering from hypertension, diabetes mellitus, those suffering from both hypertension and ischaemic heart disease, epilepsy and schizophrenia. The results showed several unique features of the QOL, which were influenced by different types of illnesses. The information obtained is different and probably not observable from clinical consultations. This study will be an impetus for further studies using the WHOQOL-100 assessment tool in the local population.
This paper highlights two cases of paediatric familial hyperlipidaemia (hypercholesterolaemia and hypertriglyceridaemia). The first case was an 11 year old Chinese boy, a "homozygous" (Type II) hypercholesterolaemic patient. He had extremely high blood cholesterol level (19.4 mmol/l), severe multiple xanthoma and abnormal resting electrocardiogram. He had repeated heart attacks and died at the age of 15 in spite of early intervention, treatment and follow up. The second case was a 2 1/2 years old girl who had severe hypertriglyceridaemia. She had raised cholesterol (6.2 mmol/l) and extremely high triglycerides (14.8 mmol/l). The patient did not resemble Type I lipoproteinaemia which is classically seen in childhood. On the contrary, the patient exhibited clinical and biochemical manifestations of a Type V lipoproteinaemia which often occurs in adults. Apart from a Type V lipoprotein pattern, the patient had low post hepatic lipase activity (PHLA), Apo C II and Apo E2/E3 phenotype. In addition, the lipid profile of her family members (both the parents and brothers) had raised triglycerides and thus ruled out the Type I lipoprotein inheritance pattern, which is an autosomal recessive condition. The issue of paediatric hyperlipidaemia, their management and treatments are discussed.
Diabetes mellitus is an important risk factor for the development of coronary artery disease. The presence of microalbuminuria, which indicates renal involvement in diabetic patients, influences the progression of coronary artery disease. New coronary risk factors such as C-reactive protein (CRP), Lipoprotein a [Lp (a)] and fibrinogen are increasingly being recognized as important cardiovascular prognostic factors. These new coronary risk factors could account for the worse cardiovascular prognosis in diabetic patients with microalbuminuria. Our cross sectional study was to compare the prevalence of elevated CRP and the levels of Lp (a) and fibrinogen between diabetic patients with microalbuminuria and those without microalbuminuria. Diabetic patients with overt coronary artery disease were excluded from the study. A total of 108 patients were recruited of which 57 patients had microalbuminuria and 51 were without microalbuminuria. There was no difference in the number of patients with elevated CRP between these two groups. There were also no significant differences in the mean values of Lp (a) and fibrinogen between diabetic patients with and without microalbuminuria. The inflammatory marker CRP and coagulopathy markers i.e. Lp (a) and fibrinogen seem not to be perturbed in diabetic patients with microalbuminuria.
A retrospective study was done on 302 patients who had undergone coronary artery bypass grafting (CABG) in Hospital Universiti Kebangsaan Malaysia--46.0% were Chinese, 40.1% were Malays and 11.6% were Indians. Overall and irrespective of race and sex, the prevalence of diabetes mellitus, hypertension and hyperlipidaemia was 45.7%, 78.8% and 89.1% respectively indicating that hyperlipidaemia was the most prevalent risk factor amongst this cohort. The Indians had the highest prevalence of the three risk factors. The Chinese and the Malays most frequently presented with the combination of hypertension and hyperlipidaemia.
Cardiovascular disease, in particular coronary artery disease (CAD), remains the most important cause of morbidity and mortality in developed countries and, in the near future, more so in the developing world. Atherosclerotic plaque formation is the underlying basis for CAD. Growth of the plaque leads to coronary stenosis, causing a progressive decrease in blood flow that results in angina pectoris. Acute myocardial infarction and unstable angina were recently recognised as related to plaque rupture, not progressive coronary stenosis. Acute thrombus formation causes an abrupt coronary occlusion. The characteristics of the fibrin cap, contents of the plaque, rheological factors and active inflammation within the plaque contribute to plaque rupture. Oxidative processes are important in plaque formation. Oxidized low density lipoproteins (LDL) but not unoxidized LDL is engulfed by resident intimal macrophages, transforming them into foam cells which develop into fatty streaks, the precursors of the atherosclerotic plaque. Inflammation is important both in plaque formation and rupture. Animal studies have shown that antioxidants reduce plaque formation and lead to plaque stabilisation. In humans, high intakes of antioxidants are associated with lower incidence of CAD, despite high serum cholesterol levels. This observation suggests a role for inflammation in CAD and that reducing inflammation using antioxidants may ameliorate these processes. Men and women with high intakes of vitamin E were found to have less CAD. Vitamin E supplementation was associated with a significant reduction in myocardial infarction and cardiovascular events in the incidence of recurrent myocardial infarction. In the hierarchy of evidence in evidence-based medicine, data from large placebo-controlled clinical trials is considered necessary. Results from various mega-trials have not shown benefits (nor adverse effects) conferred by vitamin E supplementation, suggesting that vitamin E has no role in the treatment of CAD. These results do not seem to confirm, at the clinical level, the effect of antioxidants against active inflammation during plaque rupture. However, a closer examination of these studies showed a number of limitations, rendering them inconclusive in addressing the role of vitamin E in CAD prevention and treatment. Further studies that specifically address the issue of vitamin E in the pathogenesis of atherosclerosis and in the treatment of CAD need be performed. These studies should use the more potent antioxidant property of alpha-tocotrienol vitamin E.
We present a case report of a 60-year-old Malay man who was undergoing an urgent coronary artery bypass graft (CABG) operation when a well encapsulated thymoma-like tumor was found incidentally. Total thymectomy was performed together with the CABG. Histopathological report of the tumor, however, confirmed a rare thymic carcinoid. The clinical features, management, and outcome of surgery are discussed.
Hypertension and smoking are established and independent risk factors for cardiovascular diseases. There are important inter-relationships between these two factors that may explain the aetiology of coronary heart disease. This study was conducted to determine the prevalence of hypertension and smoking in a rural community setting in Malaysia, and to identify their associated factors. A cross sectional study was conducted among residents aged 15 years and above in Mukim Dengkil, Sepang, Selangor, Malaysia from June to October 1999. Systematic random sampling was used to select the respondents. Results: Five-hundred and seventy respondents agreed to participate giving a response rate of 86.7%. The overall prevalence of hypertension was 26.8%. The prevalence was 31.7% among males, and 23.5% among females. Factors found to be significantly associated with hypertension were males and age. The overall prevalence of smoking was 21.2%. The prevalence among males was 48.7%, where as the prevalence was only 2.6% among females. The factors associated with smoking were males, ethnicity with Malays showing the highest prevalence of 27.2% and age. However, there was no significant association between hypertension and smoking. The prevalence of hypertension in this study is high. However, the prevalence of smoking in this study was slightly lower compared to the result found by the 2nd Malaysian National Health and Morbidity Survey (NHMS2).
We present an interesting but high-risk case of an obese male patient aged 56 years with dextrocardia and a left diaphragmatic hernia. Anterior myocardial infarction was diagnosed in 1994, and the patient later presented with a history of unstable angina. The diagnosis for this chronic smoker was triple-vessel disease, impaired left ventricular function, chronic renal failure, chronic bronchitis, impaired lung function, pulmonary hypertension, hypertension, diabetes, and chronic active gastritis (EuroSCORE of 10). The patient underwent successful off-pump coronary artery bypass grafting with 3 saphenous vein grafts to the left anterior descending, obtuse marginal, and right posterior descending arteries. He was discharged home 8 days later.
A cross sectional survey on the assessment of coronary heart disease risks was conducted on a group of security guards in a public university. The objectives were to assess the risk of coronary heart disease (CHD) among the security staff and to provide advice on CHD prevention and practice of a healthy lifestyle. A face»t0»face questionnaire was used to conduct the survey. The main outcome measure was the coronary heart disease (CHD) risk score estimates. The handings showed that 61 participants ( 5 3 .0%) have very high CHD risk factors, while the rest, 38.3% and 8.7% have moderate and low CHD risk factors respectively. With increasing age, there is an increase in total risk score among the target groups. The percentage increases almost 2-fold between the 21-30 and the 31-40 age groups. Majority of the security staff had high CHD risk factors and more efforts and preventive measures must be taken to overcome this situation. Personalised advice was given to participants based on their CHD risks estimates.
The new 64-row multidetector computed tomography (CT)-assisted angiography can now detect coronary artery disease with shorter breath-hold time and at faster heart rates for symptomatic patients. We aim to determine if the 64-row scanner can also overcome limitations due to mild to moderate calcification.
Factor VII (FVII) is an independent risk factor for coronary artery disease. Three polymorphisms of the factor VII gene (F7) were studied in a group of healthy newborns comprising 561 Chinese, 398 Malays and 226 Asian Indians from Singapore. The allele frequencies of 3 polymorphisms (R353Q, Promoter 0/10bp Del/Ins and Intron 7) in the FVII gene were ascertained through genotyping by polymerase chain reaction and restriction digestion of amplified fragments. In Chinese the minor allele frequencies are Q: 0.04, Ins: 0.03, R7: 0.44; Malays, Q: 0.06, Ins: 0.10, R7: 0.41; and Indians, Q: 0.25, Ins: 0.23, R7: 0.43. Strong linkage disequilibrium (Delta > 0.7) is observed between the 0/10 bp and the R353Q sites in all ethnic groups. We conclude that: (i) the prevalence of the minor Q and Ins alleles of the R353Q and 0/10 bp polymorphisms are significantly higher in the Indian newborns than the Chinese and Malays; (ii) the Q allele is significantly associated (p = 0.01) with a lower plasma FVII coagulant level in the Indian and Malay neonates; and this polymorphism explains up to 3.8% of the variance in FVII coagulant levels; (iii) there is no significant difference in allele frequencies of the three polymorphisms between neonates with and without family histories of CAD.
The authors describe the case of a 50-year-old man with chronic progressive external ophthalmoplegia (CPEO), diabetes mellitus (DM), and coronary artery disease. The patient had no cardiac conduction abnormalities. During coronary artery bypass surgery, his heart and two skeletal muscles were biopsied. All three muscles showed ragged red fibers. The heart muscle showed significant glycogen accumulation. Analysis of mitochondrial DNA (mtDNA) showed a 5019-base-pair deletion, with no duplications. There were morphologically abnormal mitochondria in all 3 muscles, with clinically apparent difference in preservation of function. The combination of diabetes mellitus and mtDNA deletion is fortuitous, as they can be causally linked. The cardiac pathology allows speculation about the possible adaptive processes that may occur in the heart in DM. There are few reported cases with CPEO and excess glycogen in the heart. Most show deposition of fat and poorer clinical outcomes as compared to those with glycogen deposition. This observation may lend support to the hypothesis that in the myocardium, adaptive responses are mediated via changes in glucose handling, whereas alterations in fat metabolism likely represent maladaptation.
Plasma total homocysteine levels (tHcy) is lowered by high insulin levels, and it can be elevated in insulin-resistant states. However, it is uncertain whether plasma tHcy and insulin or any components of the metabolic syndrome has any relationship among hypertensive individuals. In this study the tHcy and insulin concentrations were measured by enzyme immunoassay techniques in samples from 41 (27 male and 14 female) participants. Components of the metabolic syndrome (insulin resistance) profiles were also evaluated. The participants’ age ranged from 31 to 67 years (mean+SEM, 52.1±1.3 years), body mass index from 20.2 to 38.3 kg/m2 (27.2±0.7 kg/m2), plasma tHcy concentration from 6.9 to 16.2 μmol/L (11.0±0.4 μmol/L), and plasma insulin 3.0 to 16.6 μIU/mL (7.3±0.5 μIU/mL). A significant negative correlation was found between tHcy concentrations and insulin levels (r=-0.358, P=0.011), but not with other variables (P>0.05). In conclusion, the tHcy concentration is significantly related to plasma insulin in hypertensive subjects. tHcy concentrations were independent of the components of the metabolic syndrome and other risk factors of coronary heart disease in hypertensive subjects.
This study described the practice profile of an open access exercise stress test (EST) service to the primary care physicians at a teaching hospital in 2000. We performed a retrospective review of all ESTs ordered and conducted by the primary care physicians. A total of 145 ESTs were conducted, of which 80.7% were referred for assessment of chest pain. Proportions of positive, negative, uninterpretable and inconclusive ESTs were: 22.1%, 52.8%, 18.1% and 6.9%. Typical chest pain was independently associated with a positive EST in this study (p = 0.008, OR 5.50, 95% CI 1.56-19.37). Although referral to the open access EST service seemed appropriate, there is a need to reduce the number of uninterpretable and inconclusive results.