Thrombin generation profiling in rare coagulation factor deficiencies: associations with bleeding severity and...

Area of Science:

• Hematology
• Hemostasis
• Coagulation disorders

Background:

• Rare coagulation factor deficiencies (RCFDs) present diagnostic challenges as standard tests like APTT and PT may not detect abnormalities.
• Factor activity levels do not reliably predict bleeding severity (BS) in RCFDs.
• Thrombin generation assays offer a more comprehensive assessment of hemostatic capacity.

Purpose of the Study:

• To evaluate the utility of thrombin generation assays in detecting RCFDs.
• To determine if thrombin generation parameters correlate with bleeding severity in patients with RCFDs.
• To compare the sensitivity of thrombin generation assays with conventional screening tests (APTT and PT).

Main Methods:

• The Nijmegen Hemostasis Assay (NHA) was used to measure thrombin generation in 106 patients with RCFDs.
• Key parameters analyzed included thrombin potential (TP), lag time (LT), and the TP/LT ratio, normalized to healthy controls.
• NHA data were correlated with bleeding severity (BS) and compared to APTT and PT results.

Main Results:

• Thrombin generation was significantly reduced in patients with RCFDs compared to controls.
• TP/LT ratios demonstrated a clear correlation with bleeding severity, ranging from 30-104% in patients with no spontaneous bleeding to 0-22% in those with severe bleeding.
• The TP/LT ratio showed higher sensitivity (68-100%) than APTT and PT (14-80%) in detecting RCFDs, except for FVII and FV/FVIII deficiencies.

Conclusions:

• Thrombin generation profiling is a sensitive method for detecting rare coagulation factor deficiencies.
• Thrombin generation parameters correlate with bleeding severity in RCFDs.
• These findings support the use of thrombin generation assays in the screening and clinical evaluation of RCFDs.