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Model of Thankavel et al for Predicting Patent Ductus Arteriosus (PDA) Closure in a Neonate

Description

Thankavel et al evaluated closure of a patent ductus arteriosus (PDA) in neonates <= 30 weeks gestation using echocardiography. These can help to identify a neonate who may require an intervention. The authors are from the University of Texas Southwestern Medical Center and Children's Medical Center of Dallas.


 

Patient selection: premature infant <= 30 weeks gestation with PDA

 

Testing: echocardiography on postnatal day 3

 

Parameters:

(1) diameter of PDA in mm

(2) diameter of left pulmonary artery (LPA)

(3) gestational age in weeks

 

ratio of PDA to LPA =

= (PDA diameter) / (LPA diameter)

 

The PDA was considered moderate or large if the ratio was >= 0.5.

Gestational Age

PDA to LPA Ratio

Spontaneous Closure

< 27 weeks

< 0.5

60%

< 27 weeks

>= 0.5

9%

27 to 30 weeks

< 0.5

95%

27 to 30 weeks

>= 0.5

27%

 


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