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[Carotid artery thrombosis and myocardial infarction in nephrotic syndrome]
1Service de cardiologie, CHRU Nîmes.
Insights
Nephrotic syndrome can lead to serious blood clots and heart issues due to clotting abnormalities and high cholesterol. Chronic cases pose a significant cardiovascular risk, potentially requiring long-term anticoagulant therapy.
Area of Science:
- Nephrology
- Cardiology
- Hematology
Background:
- Nephrotic syndrome is characterized by significant proteinuria, edema, hypoalbuminemia, and hyperlipidemia.
- It is associated with a high risk of thromboembolic complications, including arterial and venous thrombosis.
- Disturbances in hemostasis and lipid metabolism are key features contributing to this risk.
Observation:
- A case report details an 18-year-old male with chronic corticosteroid-refractory nephrotic syndrome experiencing carotid artery thrombosis and myocardial infarction.
- Observed hemostatic abnormalities include platelet hyperaggregability, increased plasma zymogens and cofactors, elevated fibrinogen, fibrinolytic system dysfunction, and acquired deficiencies in coagulation inhibitors.
- Lipid profile alterations include varied lipoprotein patterns, often with increased low-density lipoproteins (LDL) and very-low-density lipoproteins (VLDL), and inconsistent high-density lipoprotein (HDL) levels.
Findings:
- Increased platelet aggregation and antithrombin III deficiency are likely contributors to the hypercoagulable state in nephrotic syndrome.
- Lipid profile changes, particularly elevated LDL and VLDL, possess atherogenic potential.
- While short-duration nephrotic syndrome may not increase coronary event incidence, chronic cases with prolonged hemostatic and lipid abnormalities significantly elevate cardiovascular disease risk.
Implications:
- Patients with chronic nephrotic syndrome and persistent hemostatic and lipid abnormalities face a substantial risk of cardiovascular disease.
- Long-term anticoagulant therapy may be necessary for managing thromboembolic risk in these patients.
- Further research is needed to fully elucidate the complex interplay of hemostatic and lipid factors in nephrotic syndrome-associated cardiovascular complications.
Abstract:
The authors report the case of a 18 year old man with a chronic corticosteroid-refractory nephrotic syndrome complicated by carotid artery thrombosis and myocardial infarction. Thromboembolism is one of the most serious complications of the nephrotic syndrome. Serious clotting factor disturbances are observed: changes in platelet function (hyperaggregability) increased plasma zymogens and cofactors, increased plasma fibrinogen, abnormalities of the fibrinolytic system and acquired deficiencies of coagulation inhibitors. The respective role of each of these abnormalities have not been clearly established, but it is likely that increased platelet aggregation and antithrombin III deficiency are important factors in producing a hypercoagulable state in the nephrotic syndrome. Hyperlipidemia is also a characteristic feature of the nephrotic syndrome: these is a wide spectrum of lipoprotein patterns with increased low density lipoproteins (LDL) or very low density lipoproteins (VLDL) or both; contradictory results have been reported with respect to the high density lipoproteins (HDL): decreased, normal or even increased plasma levels have been observed. In addition, changes in the distribution and composition of LDL and VLDL subclasses have been detected. Most of these changes have an atherogenic potential but controversy still surrounds the question of the prevalence of ischaemic heart disease in the nephrotic syndrome; it is unlikely that nephrotic syndromes of short duration have any influence on the incidence of coronary events, but patients with chronic heavy protein urea and long-term exposure to abnormalities of haemostasis and lipid profiles appear to have a significant risk of developing cardiovascular disease and may require long-term anticoagulant therapy.