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Intracardiac thrombosis in low output state — Clinical Guidelines

Overview

Intracardiac thrombosis in a low output state refers to the formation of blood clots within the heart chambers, often complicating conditions with reduced cardiac output, potentially leading to systemic embolization and hemodynamic instability. 5

Diagnosis

Echocardiography: Primary imaging modality for detecting intracardiac thrombi. 6

D-dimer Levels: Useful in assessing lytic activity alongside clotting activity. 5

Indium-111 Fibrinogen Cardiac Survey: Noninvasive technique for detecting thrombi, though less commonly used. 6

Protein-C Deficiency Screening: Recommended in pediatric cases to identify potential etiological factors. 4

Management

Oral Anticoagulants: Warfarin therapy is standard, requiring careful monitoring of INR levels to avoid under- or over-anticoagulation. Target INR range typically 2.0-3.0. 1 3

Local Low-Dose Urokinase: Considered safe and effective for thrombolysis in high-risk patients like preterm infants, with minimal systemic fibrinolytic activity. 2

Monitoring and Adjustment: Centralized monitoring services with specialized staff and computer-assisted dosing can improve management outcomes. 1

Special Populations

Pediatrics: Local low-dose urokinase shows promise for thrombolysis in preterm infants without systemic side effects. 2

Protein-C Deficiency: Particularly relevant in pediatric cases; screening is advised even in the absence of other predisposing factors. 4

Key Recommendations

Implement centralized oral anticoagulant monitoring services with specialized staff to optimize INR control and reduce complications like bleeding. (Evidence: Moderate 1)

Consider local low-dose urokinase for thrombolysis in high-risk pediatric patients to minimize systemic effects while effectively treating intracardiac thrombi. (Evidence: Weak 2)

Screen for protein-C deficiency in pediatric patients diagnosed with intracardiac thrombi to identify underlying etiological factors. (Evidence: Expert opinion 4)

References

1 Casimire T, Carter R, Peters S, Tweedle J, Charles KS. Establishing an oral anticoagulant monitoring service in a multiethnic developing country. International journal of laboratory hematology 2008. link 2 Aspesberro F, Beghetti M, Oberhänsli I, Ozsahin H, Humbert J, Rimensberger PC. Local low-dose urokinase treatment of acquired intracardiac thrombi in preterm infants. European journal of pediatrics 1999. link 3 Douketis JD, Lane A, Milne J, Ginsberg JS. Accuracy of a portable International Normalization Ratio monitor in outpatients receiving long-term oral anticoagulant therapy: comparison with a laboratory reference standard using clinically relevant criteria for agreement. Thrombosis research 1998. link00098-x) 4 Ozkutlu S, Ozbarlas N, Ozme S, Saraçlar M, Gögüş S, Demircin M. Intracardiac thrombosis diagnosed by echocardiography in childhood: predisposing and etiological factors. International journal of cardiology 1993. link90008-5) 5 Umemoto K, Fukunami M, Ohmori M, Kumagai K, Sakai A, Yamada T et al.. Dynamic process between the clotting and the lytic activities on intracardiac thrombi--its relationship with systemic embolization. Japanese circulation journal 1992. link 6 Frisbie JH, Tow DE, Sasahara AA, Barsamian EM, Parisi AF. Noninvasive detection of intracardiac thrombosis: 131-I fibrinogen cardiac survey. Circulation 1976. link

Intracardiac thrombosis in low output state