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Updated: Aug 15, 2026

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Published on: March 28, 2025
Intraventricular haemorrhage in very-low-birthweight preterm infants: association with low prothrombin activity at
Marjut Salonvaara1, Pekka Riikonen, Riitta Kekomäki
1Department of Paediatrics, Kuopio University Hospital, Kuopio University, Finland. marjut.salonvaara@finmet.fi
Aim:
To determine the occurrence of intraventricular haemorrhage (IVH) and its association with coagulation factors at birth in preterm neonates born before 30 wk gestation.
Methods:
38 neonates (median gestational age 27 wk, range 24-29 wk; median birthweight (BW) 933 g, range 515-1760 g) admitted to the neonatal intensive care unit were studied. Blood samples for coagulation factors were taken within 2 h after birth. The first cranial ultrasonographic examination was performed within the first 3 d. The occurrence of IVH was tested statistically by the Mann-Whitney U-test for association with the activity of coagulation factors and clinical variables.
Results:
Thirteen IVHs occurred within the first 3 d of life. IVH was associated with BW <1000 g (p=0.012), low mean blood pressure within the first 2 d (p=0.026), gestational age <27 wk (p=0.054), low Apgar scores (<7) at 1 min (p=0.078) and intrauterine growth restriction (p=0.072). At birth (samples drawn with a median of first 36 min of life), infants with subsequent IVH had statistically significantly lower prothrombin (factor II) activity (p=0.024) than infants without IVH.
Conclusion:
The measured low prothrombin may have been affected by a prior bleeding event. Nevertheless, preterm infants with low prothrombin activity may be susceptible to IVH, or to the progression of it, if left undiagnosed.
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