Key result
Ultrasound reveals prolonged pulse delays in subclavian steal syndrome versus normal controls.
Why the study?
Does ultrasound measurement of pulse delay differentiate patients with subclavian steal syndrome from normal controls?
Does ultrasound measurement of pulse delay differentiate patients with subclavian steal syndrome from normal controls?
Ultrasound measurement of pulse delay relative to the ECG QRS complex can identify patients with subclavian steal syndrome.
May aid noninvasive detection of subclavian steal; hypothesis-generating and requires prospective validation before clinical use.
Ultrasound tracings were correlated with the electrocardiogram on an oscilloscope recorded by Polaroid photographs in 4 patients. Each had angiographic proof of subclavian steal. Measurements were recorded between the peak of the QRS complex and the foot of the pulse wave upswing. The patients showed a pulse delay of 0.03 to 0.06 second; normal controls a delay of 0.00 to 0.01 second.
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Grossman et al. (1970) studied this question. Ultrasound measurements demonstrated a pulse delay of 0.03 to 0.06 seconds in patients with subclavian steal syndrome, compared to 0.00 to 0.01 seconds in normal controls.
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