Objective: We determined thromboelastographic (TEG) profiles of healthy very low birthweight infants (VLBWIs) of the day of birth and at set intervals during their first month. Design: Prospective observational study with blinded clinical and laboratory follow-up. Setting: Level III neonatal intensive care unit (June 2015 to June 2018). Patients: Consecutive qualifying VLBWIs were enrolled at birth and followed up for 30 days. Interventions and main outcomes measures: Laboratory (citrated-native TEG, prothrombin time (PT), activated partial thromboplastin time (APTT), fibrinogen, blood count) and clinical variables were retrieved at birth, 3rd-5th, 10th and 30th day of life. Blood samples temporally related to events with a potential hemostatic impact (sepsis, bleeding, platelets/plasma transfusions, ibuprofen/indomethacin administration) were excluded from analysis. Results: We enrolled 201 VLBWIs and 72 full-term neonates. Sixty-seven of the healthy VLBWIs completed the 30-day follow-up. 541 TEG traces were analysed. On day 1, the median (minimum-maximum) TEG values were as follows: Reaction time (R), 8.2 min (1-21.8); kinetics (K), 2.8 min (0.8-16); α angle, 51° (14.2-80.6); maximum amplitude (MA), 54.9 mm (23.9-76.8). PT and APTT were 15.9 s (11.7-51.2) and 59 s (37.8-97.5), respectively. The above parameters suggest minor hypocoagulability compared with term infants. On day 30, the median (minimum-maximum) R was 5 (1-16.9), K 1 (0.8-4.1), α 74.7 (41.1-86.7) and MA 70.2 (35.8-79.7). PT and APTT were 12.1 (10.4-16.6) and 38.8 (29.6-51.4), respectively. Those parameters are consistent with a relatively hypercoagulable phenotype, compared with term infants. Conclusions: Healthy VLBWIs have a prolonged PT and APTT, but their TEG profiles suggest a relatively balanced hemostatic system, with slight hypocoagulability initially (compared with term neonates), gradually evolving to a somewhat more procoagulant phenotype over the first month.

Thromboelastographic profiles of healthy very low birthweight infants serially during their first month / G. Raffaeli, A. Tripodi, G. Cavallaro, V. Cortesi, E. Scalambrino, N. Pesenti, A. Artoni, F. Mosca, S. Ghirardello. - In: ARCHIVES OF DISEASE IN CHILDHOOD. FETAL AND NEONATAL EDITION. - ISSN 1359-2998. - 104:5(2020 Jul), pp. 412-416. [10.1136/archdischild-2019-317860]

Thromboelastographic profiles of healthy very low birthweight infants serially during their first month

G. Raffaeli;A. Tripodi;V. Cortesi;E. Scalambrino;F. Mosca;
2020-07

Abstract

Objective: We determined thromboelastographic (TEG) profiles of healthy very low birthweight infants (VLBWIs) of the day of birth and at set intervals during their first month. Design: Prospective observational study with blinded clinical and laboratory follow-up. Setting: Level III neonatal intensive care unit (June 2015 to June 2018). Patients: Consecutive qualifying VLBWIs were enrolled at birth and followed up for 30 days. Interventions and main outcomes measures: Laboratory (citrated-native TEG, prothrombin time (PT), activated partial thromboplastin time (APTT), fibrinogen, blood count) and clinical variables were retrieved at birth, 3rd-5th, 10th and 30th day of life. Blood samples temporally related to events with a potential hemostatic impact (sepsis, bleeding, platelets/plasma transfusions, ibuprofen/indomethacin administration) were excluded from analysis. Results: We enrolled 201 VLBWIs and 72 full-term neonates. Sixty-seven of the healthy VLBWIs completed the 30-day follow-up. 541 TEG traces were analysed. On day 1, the median (minimum-maximum) TEG values were as follows: Reaction time (R), 8.2 min (1-21.8); kinetics (K), 2.8 min (0.8-16); α angle, 51° (14.2-80.6); maximum amplitude (MA), 54.9 mm (23.9-76.8). PT and APTT were 15.9 s (11.7-51.2) and 59 s (37.8-97.5), respectively. The above parameters suggest minor hypocoagulability compared with term infants. On day 30, the median (minimum-maximum) R was 5 (1-16.9), K 1 (0.8-4.1), α 74.7 (41.1-86.7) and MA 70.2 (35.8-79.7). PT and APTT were 12.1 (10.4-16.6) and 38.8 (29.6-51.4), respectively. Those parameters are consistent with a relatively hypercoagulable phenotype, compared with term infants. Conclusions: Healthy VLBWIs have a prolonged PT and APTT, but their TEG profiles suggest a relatively balanced hemostatic system, with slight hypocoagulability initially (compared with term neonates), gradually evolving to a somewhat more procoagulant phenotype over the first month.
bleeding; hemostasis; neonate; thromboelastography; thrombosis
Settore MED/38 - Pediatria Generale e Specialistica
8-nov-2019
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/731594
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