Usefulness of Doppler ultrasonography to assess digital vascular dynamics in horses with systemic inflammatory response syndrome or laminitis.

The research explores the use of Doppler ultrasonography in assessing changes in digital vascular dynamics in horses affected by Systemic Inflammatory Response Syndrome (SIRS) or laminitis. The study found that Doppler ultrasonography may be beneficial in detecting digital blood flow changes in these cases.

Research Composition and Methods

• The study was a cross-sectional survey that utilized 42 adult Andalusian horses. These horses were divided into three groups:
• Group 1 consisted of 9 healthy horses;
• Group 2 consisted of 19 horses with SIRS. Among these, 9 horses did not show palpable increase in digital pulse intensity and 10 horses did;
• Group 3 included 14 horses suffering from laminitis. Out of these, 8 did not display radiographic evidence of rotation or distal displacement (sinking) of the third phalanx. The remaining 6 did.
• The researchers took qualitative spectrum characteristics and quantitative Doppler measurements of the lateral palmar digital artery for horses in each group.

Findings of the Research

• The observations showed four spectra characterized by a positive systolic peak followed by several positive diastolic peaks in Group 1 horses, Group 2 horses, and Group 3 horses lacking radiographic changes.
• The Group 3 horses which had radiographic changes showed signs of laminar blood flow.
• The size of the lateral palmar digital artery was significantly larger in Group 3 horses compared to Group 2 horses.
• The blood flow was markedly higher in Group 2 horses which had an increased digital pulse intensity compared to those without such a rise.
• Acceleration time and velocity-time integral were significantly lower in Group 3 horses when compared to Group 2 horses.

Conclusions of the Study

• The results suggest that Doppler ultrasonography might be a useful complementary tool in detecting changes in digital blood flow of horses with SIRS (especially those presenting a palpable increase in digital pulse intensity) or laminitis.