Can the change of vasomotor activity in irritable bowel syndrome patients be detected via color Doppler ultrasound?

Figure 1 Positioning of the Doppler ultrasound probe and bipolar stimulus electrode. A: Positioning of the Doppler ultrasound probe, 2 cm above the antecubital fossa using a 9 Hz linear probe; B: Positioning of the bipolar stimulus electrode.

Figure 2 Before and after electrical stimulation, the brachial artery flow/diameter parameters at control participant. A: Before electrical stimulation, the brachial artery volume flow rates/diameter values of a 45-year-old healthy control participant were measured to be 66.1 mL/min, 3 mm; B: The post-stimulation values of the same patient were 52.5 mL/min, 2.5 mm.

Figure 3 Before and after electrical stimulation, the brachial artery flow/diameter parameters in a patient diagnosed with irritable bowel syndrome. A: Before electrical stimulation, the brachial artery flow/diameter parameters of a 38-year-old female patient diagnosed with irritable bowel syndrome were assessed to be 53.2 mL/min, 3.2 mm; B: The post-stimulation values of the same patient were 120 mL/min, 4.7 mm.