Real-time echo-Doppler Duplex Scanner in the evaluation of patients with Poland sequence

Area of Science:

• Vascular Medicine
• Pediatric Cardiology
• Medical Imaging

Background:

• Poland sequence is a rare congenital condition characterized by underdeveloped muscles on one side of the chest and abnormalities of the arm and hand.
• The exact etiology of Poland sequence remains unclear, with various theories proposed.
• Vascular involvement has been suggested but not consistently demonstrated.

Purpose of the Study:

• To investigate the role of subclavian artery hypoplasia in Poland sequence.
• To compare subclavian artery dimensions and blood flow in affected individuals with healthy controls.
• To determine if vascular defects are a primary component of Poland sequence.

Main Methods:

• Real-time echo-Doppler Duplex Scanner was used to measure subclavian artery diameter and flow velocity waveforms.
• Measurements were taken in two neonates with partial Poland sequence and one infant with complete Poland sequence, as well as the infant's mother.
• Comparisons were made between the affected side and the normal side within the same patient.

Main Results:

• Subclavian artery diameter and flow velocity waveforms were significantly lower on the affected side compared to the normal side in all studied patients.
• These findings suggest a localized vascular defect in the subclavian artery.
• The mother of an infant with complete Poland sequence also showed reduced measurements on one side.

Conclusions:

• Subclavian hypoplasia is a significant vascular defect that appears to be a key component of Poland sequence.
• This finding supports the hypothesis that vascular abnormalities contribute to the pathogenesis of Poland sequence.
• Further research is warranted to elucidate the precise mechanisms linking vascular defects to other manifestations of Poland sequence.