Lipemia: Causes, Symptoms and Treatment
Lipemia refers to an elevated concentration of fats in the blood, causing a milky or turbid appearance of blood serum. It may indicate an underlying metabolic disorder.
Wissenswertes über "Lipemia"
Lipemia refers to an elevated concentration of fats in the blood, causing a milky or turbid appearance of blood serum. It may indicate an underlying metabolic disorder.
What is Lipemia?
Lipemia (also spelled lipaemia) is a condition in which the concentration of lipids (blood fats) in the bloodstream is so elevated that the blood serum or plasma takes on a characteristic milky-white or cloudy appearance. This turbidity is caused by an excessive accumulation of chylomicrons and VLDL particles (Very Low Density Lipoproteins) -- large, fat-rich lipoprotein particles -- in the blood.
Lipemia is not a disease in itself but rather a clinical finding that points to an underlying disturbance in fat metabolism. It is closely associated with markedly elevated triglyceride levels (hypertriglyceridemia) and can be either transient or persistent.
Causes
Lipemia can result from a variety of causes, broadly divided into primary (genetic) and secondary (acquired) forms:
Primary Causes
- Familial hypertriglyceridemia: An inherited disorder of triglyceride metabolism
- Familial combined hyperlipidemia: A genetic lipid disorder with elevated triglycerides and cholesterol
- Familial lipoprotein lipase deficiency: A rare hereditary condition in which the enzyme lipoprotein lipase is absent or non-functional
Secondary Causes
- Diabetes mellitus (especially poorly controlled type 2 diabetes)
- Alcohol abuse
- Hypothyroidism (underactive thyroid gland)
- Chronic kidney disease
- Obesity
- Certain medications (e.g., corticosteroids, beta-blockers, estrogens)
- Postprandial lipemia: A temporary rise in blood fats following a high-fat meal
Symptoms
Lipemia itself often causes no direct symptoms and is frequently discovered incidentally during routine blood tests. However, when triglyceride levels are severely elevated, the following signs may appear:
- Visible turbidity of blood serum in a blood sample (milky appearance)
- Xanthomas: Yellowish-white fatty deposits in the skin or tendons
- Xanthelasmas: Fatty deposits on the eyelids
- Lipemia retinalis: Whitish discoloration of the retinal blood vessels, visible during eye examination
- Abdominal pain and an increased risk of acute pancreatitis (inflammation of the pancreas) at very high triglyceride levels
- Hepatosplenomegaly: Enlargement of the liver and spleen
Diagnosis
Lipemia is primarily diagnosed through blood tests. Key diagnostic steps include:
- Fasting lipid panel: Measurement of total cholesterol, LDL, HDL cholesterol, and triglycerides after at least 12 hours of fasting
- Visual assessment of the serum: At markedly elevated triglyceride levels (typically above 1000 mg/dL), the milky turbidity of the serum is visible to the naked eye
- Extended laboratory workup: Blood glucose, HbA1c, thyroid function, kidney and liver values to identify secondary causes
- Genetic testing: When a primary (hereditary) lipid disorder is suspected
It is also important to distinguish lipemia from other causes of turbid blood samples, as a lipemic specimen can interfere with the accuracy of many laboratory assays.
Treatment
Treatment of lipemia is guided by the underlying cause and the severity of the lipid disturbance:
Lifestyle Modifications
- Dietary changes: Reducing saturated fats, sugar, and alcohol; increasing dietary fiber and unsaturated fatty acids
- Physical activity: Regular exercise lowers triglyceride levels and improves lipid metabolism
- Weight reduction: Achieving a healthy body weight in overweight individuals
- Alcohol abstinence: Alcohol can significantly raise triglyceride levels
Pharmacological Therapy
- Fibrates (e.g., fenofibrate): First-line treatment for very high triglyceride levels
- Omega-3 fatty acids (high-dose): Effectively lower elevated triglycerides
- Statins: Primarily used when LDL cholesterol is elevated
- Niacin (nicotinic acid): Lowers triglycerides and raises HDL cholesterol
Treatment of the Underlying Condition
In secondary lipemia, treating the root cause is the priority -- for example, optimizing blood sugar control in diabetes or managing an underactive thyroid gland.
Clinical Relevance
Lipemia is clinically significant because it can increase the risk of cardiovascular diseases such as heart attack and stroke. Severely elevated triglyceride levels are also a major risk factor for acute pancreatitis, which can be life-threatening. Additionally, a lipemic blood sample can distort the results of many laboratory tests and must be carefully accounted for in clinical laboratory practice.
References
- Berglund L. et al. - Evaluation and Treatment of Hypertriglyceridemia: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2012.
- Simha V. - Management of hypertriglyceridemia. BMJ. 2020;371:m3109.
- World Health Organization (WHO) - Global Health Observatory: Raised cholesterol. WHO, Geneva, 2023. Available at: https://www.who.int
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