Interview with Ms. Sylvia Lam - Nutrition and its Impact on Cardiac Rehabilitation
At a recent interview in Hong Kong, Senior Registered Dietitian Sylvia Lam (Accredited Practicing Dietitian, Australia) shared her insights on the trends and causes of cardiovascular disease (CVD), and discussed the importance of nutrition in cardiac rehabilitation programmes. This article presents highlights from the interview.
- Prevalence of cardiovascular disease in Hong Kong and its risk factors
- Cardiac rehabilitation program and its role in disease management
Senior Registered Dietitian & Healthy Lifestyle Consultant
Pro Cardio Heart Diseases and Prevention Centre cum
Pacific Dietetic and Exercise Consultant Centre
Tsim Sha Tsui, Hong Kong
CVD includes a number of conditions affecting the structure or function of the heart, many of which are related to the buildup of cholesterol in the walls of the arteries (coronary heart disease) and calcification of the arteries.1 This buildup narrows the arteries, making it harder for blood to flow through them. If a blood clot forms, it can stop the blood flow which can lead to a heart attack or stroke.1 A cardiac rehabilitation programme aims to help patients return to a normal life and encourage them to make lifestyle changes to prevent further cardiac events.2
- What is the prevalence of CVD in HK? Are there any trends in the prevalence in recent years?
- What are the risk factors for CVD? What do you think caused the gender difference in the prevalence of CVD?
- What are the main signs and symptoms of CVD?
- What is the cardiac rehabilitation programme and what is its role in disease management?
- As early intervention is critical, what dietary or lifestyle advice should healthcare professionals (HCPs) give to people who are at risk of CVD?
- Practical tips for HCPs
SL: Ms Sylvia Lam
R: What is the prevalence of CVD in HK? Are there any trends in the prevalence in recent years?
SL: In Hong Kong, CVD is the second leading cause of mortality, accounting for about 15% of all deaths in 2011.3 Coronary heart disease is the dominant component, making up 68.9% of CVD deaths.3 The number of in-patient discharges and deaths due to coronary heart disease continues to rise steadily in recent years.4 In 2012, 34,533 in-patient discharges and deaths were related to coronary heart disease, accounting for 1.7% of all in-patient discharges and deaths (Figure).4 Moreover, the death rate due to coronary heart disease in males was higher than that in females (75.9 and 45.7 per 100,000 population, respectively).4
R: What are the risk factors for CVD? What do you think caused the gender difference in the prevalence of CVD?
SL: The major modifiable risk factors for coronary heart disease are obesity, lack of physical activity, chronic stress, smoking, and excessive alcohol drinking. Family history of the disease may also increase the risk. The difference in lifestyle between men and women may explain the higher rates of CVD in men, especially those in their middle age. Women usually pay more attention to their weight and eating habits than men. Men are more prone to have stress from work and also pay less attention on what they eat. However, CVD incidents have occurred at earlier ages in recent decades due to stressful lifestyles in both genders.
R: What are the main signs and symptoms of CVD?
SL: Symptoms of CVD may include nausea, chest pain that may radiate to the back, heart burn, and breathlessness, especially when they undergo physical exertion (eg, exercise, walking up the stairs).3 However, the majority of patients are asymptomatic, as their arteries are not completely blocked.
In Hong Kong, CVD is the second leading cause of mortality, accounting for about 15% of all deaths
R: What is the cardiac rehabilitation programme and what is its role in disease management?
SL: Cardiac rehabilitation programmes consist of exercise training together with nutrition/diet education and psychological support, and are implemented for patients who have undergone heart surgery or percutaneous coronary intervention (PCI), suffered a heart attack, been diagnosed with coronary heart disease or are at risk of developing coronary heart disease.2 The goal of a cardiac rehabilitation programme is to modify three main risk factors – diabetes, hypertension and hypercholesterolaemia as most patients with heart diseases might suffer from these common risk factors. My cardiac rehabilitation programme team consists of a dietitian (myself), a qualified physical trainer and a cardiac rehabilitation nurse. I provide professional advice on managing healthy food choices, weight management, and eating for a healthy heart. The physical trainer provides a monitored exercise regime which is tailor-made for the patient’s current level of fitness and designed to improve cardiovascular fitness and muscular strength. The cardiac rehabilitation nurse provides education on the nature of the illness, CVD risk factors and medication, and guidance on physiological issues such as stress management, smoking cessation, returning to work, and resuming sexual activity.
The goal of a cardiac rehabilitation programme is to modify three main risk factors – diabetes, hypertension and hypercholesterolaemia
R: As early intervention is critical, what dietary or lifestyle advice should healthcare professionals (HCPs) give to people who are at risk of CVD?
SL: Although there are not much data from Hong Kong, my experience with CVD patients shows that they tend to have a high intake of saturated and trans fats. Both saturated and trans fats raise the level of low-density lipoprotein cholesterol (LDL-C) while trans fats also reduce high-density lipoprotein cholesterol (HDL-C). It is important for at-risk patients to choose food rich in unsaturated fats, which help reduce LDL-C and increase HDL-C. Unsaturated fats are also typically high in vitamin E, an antioxidant. Examples of foods high in unsaturated fats include vegetable oils, such as olive oil and canola oil. Other sources include avocados, peanut butter, and different kinds of nuts and seeds. The major problem is that saturated and trans fats are hidden in our local foods such as pineapple buns, milk tea (saturated fats), egg tarts and dim sum (trans fats). Curry beef brisket with rice, which is a common lunch meal easily found in local restaurants, contains about 4.4 teaspoons of saturated fat (adults should not exceed 2–3 teaspoons of saturated fat per day); many people do not know this fact. Therefore, we need to educate people to make better food choices when dining out since Hong Kong people tend to eat out very often.
We also see that Hong Kong people tend to have low intake of dietary fiber which is mainly derived from whole grains, fruits and vegetables. The Behavior Risk Factor Survey April 2012 revealed that 82% of our population does not eat 5 servings of fruits and vegetables per day.5 I, therefore, advise cardiac rehabilitation patients on how to increase fiber intake in their daily diet. For example, choose whole grains (eg, oatmeal, whole meal bread, mixed grain rice) as the main staple foods, increase vegetable intake in main meals and eat fruits as healthy snacks. There are also many evidence-based functional foods such as fatty fish, soy bean products, and plant sterols, etc, that help to better control the blood cholesterol levels. I also teach them how to cook healthily, read nutrition labeling and provide practical tips when eating out or travelling so the patients are aware of what they are eating and can increase food variety. The purpose is to equip them with a wide-range of nutrition knowledge so they can utilize foods to improve their heart health and prevent recurrence of cardiac events.
Finally, we help overweight patients to set a weight loss target which is to lose 5–10% of current weight in 4–6 months. Our team assists and provides support to the patients along the way to achieve this target.
- American Heart Association. What is Cardiovascular Disease (Heart Disease)? Available at: http://www.heart.org/HEARTORG/Caregiver/Resources/WhatisCardiovascularDisease/What-is-Cardiovascular-Disease_UCM_301852_Article.jsp#. Accessed 18 February 2014.
- National Heart, Lung and Blood Institute. What is Cardiac Rehabilitation? Available at: https://www.nhlbi.nih.gov/health/health-topics/topics/rehab/#. Accessed 20 March 2014.
- Centre for Health Protection. Heart Diseases. Available at: http://www.chp.gov.hk/en/content/9/25/57.html. Accessed 18 February 2014.
- Department of Health. HealthyHK. Coronary Heart Diseases. Available at: http://www.healthyhk.gov.hk/phisweb/en/healthy-facts/disease-burden/major-causes-death/coronary-heart-disease/. Accessed 18 February 2014.
- Centre for Health Protection. Department of Health. Diet and Nutrition. Available at: http://www.chp.gov.hk/en/content/9/25/8800.html. Accessed 26 March 2014.