Role of intestinal ultrasound in ulcerative colitis: A systematic review

Table 4 Summary of studies on superior mesenteric artery/inferior mesenteric artery artery flow in evaluating inflammatory bowel disease activity

Ref.	Study type	Number of patients	Parameters studied
Ahmed et al[41]	Prospective	84 UC (16 CD, 50 normal)	SMA and IMA PSV and EDV significantly higher in UC compared to controls; pulsatility index significantly higher in control group than UC
Maconi et al[38]	Prospective	24 UC (31 CD, 10 IBS)	Higher portal and mesenteric blood flow with lower RI of SMA was noted in active UC as compared to quiescent UC
Mirk et al[39]	Prospective	22 UC, 24 CD	IBD with active disease in left colon presented increases in flow velocity and flow volume with decrease in pulsatility index
Siğirci et al[40]	Prospective	44 (25 active, 19 inactive, 22 healthy)	IMA blood flow volume, mean PSV, ESV, mean velocity, and vessel diameter were higher and pulsatility index lower in active disease compared to quiescent disease; active disease in left colon had high higher mean PSV and velocity in IMA; mean EDV higher with lower mean PI and RI in SMA for those with pancolonic involvement

SMA: Superior mesenteric artery; CD: Crohn’s disease; IMA: Inferior mesenteric artery; PSV: Peak systolic velocity; EDV: End diastolic velocity; UC: Ulcerative colitis; ESV: End systolic velocity; RI: Resistive index; PI: Pulsatility index; IBS: Irritable bowel syndrome; IBD: Inflammatory bowel disease.