Key result
Neonatal LV afterload is ~24% lower at 3 hours versus day 5, supporting adequate contraction.
Why the study?
How does the left ventricular contractile state change in early human neonates with patent ductus arteriosus within 24 hours after birth?
Population
32 full-term infants within 24 hr after birth, divided into group 1 and group 2
Comparison
Echocardiographic evaluation at different time… vs Control group and day 5 examinations
Design
Cohort
Follow-up
5 days
Authors
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Reduced afterload may aid LV performance despite PDA shunting in neonates; leaves open questions on contractile adaptation and requires prospective validation.
Observational (n=32)
No
How does the left ventricular contractile state change in early human neonates with patent ductus arteriosus within 24 hours after birth?
Absolute Event Rate: 31.7% vs 41.5%
p-value: p=<0.01
In early human neonates, a low afterload condition helps maintain adequate left ventricular contraction despite increased preload from left-to-right ductus arteriosus shunting.
Takahashi et al. (1994) conducted an observational in Patent ductus arteriosus (n=32). Early neonatal period (<3 hours after birth) vs. Day 5 after birth was evaluated on End-systolic meridional wall stress (ESS) (p=<0.01). In early human neonates, left ventricular afterload was significantly lower within 3 hours of birth compared to day 5 (end-systolic meridional wall stress 31.7 vs 41.5 g/cm2, p<0.01), supporting adequate contraction despite increased preload.
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