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Keywords:

  • Angiography;
  • Interventional therapy;
  • 2-dimensional echocardiography;
  • Ultrasonography

Background:Patent ductus arteriosus (PDA) size and morphology influence the selection of the kind and the size of the embolization device used to effect shunt closure.

Hypothesis:That echocardiographic measurement of PDA in dogs is accurate.

Animals:Forty-five client-owned dogs with PDA.

Methods:Prospective observational study. Echocardiographic and angiographic data were compared.

Results:Measurement of the ductus in color Doppler echocardiography (CD-E) and 2-dimensional echocardiography (2D-E) was achieved from left parasternal views in 43 of 45 unsedated dogs (96%). In these 43 dogs, the angiographic minimal PDA diameter was 3.72 ± 1.59 mm, and the diameter of the PDA ampulla was 8.46 ± 3.01 mm. The CD-E minimal PDA diameter ranged from 2.3 to 9.5 mm (median, 4.0 mm). There was a significant mean difference to the angiographic measurements (1.15 ± 0.95 mm; P < .0001). An agreement in a 1-mm range was found in 21 of 43 dogs (48%). The 2D-E minimal PDA diameter was 3.73 ± 1.78 mm, and the mean difference to the angiographic measurements was not significant (0.00 ± 0.72 mm; P= .98). An agreement in a 1-mm range was found in 31 of 43 dogs (72%). The 2D-E measurement of the PDA ampulla revealed a significant mean difference to the angiographic data (1.95 ± 2.43 mm, P < .0001). An agreement in a 2-mm range was found in 21 of 43 dogs (49%).

Conclusions and Clinical Importance: The 2D-E from the left cranial parasternal view is an excellent noninvasive method to estimate the PDA minimal diameter before doing catheter intervention.