Factors influencing the yield of mesenteric angiography in lower gastrointestinal bleed

Table 1 Factors that were found to be significant determinants of a positive angiogram¹

	Positive angiogram (28 patients)	Negative angiogram (73 patients)	t-test P value
Average age (yr)	73.2 ± 10.9	65.9 ± 15.3	0.023
ICU admission (n)	11	14	0.036
Number of PRBCs transfused 12 h prior angiography (units)	2.7 ± 2.3	1.6 ± 1.9	0.022
Number of PRBCs transfused 24 h prior angiography (units)	3.3 ± 2.6	2.1 ± 2.6	0.043

¹Plus-minus values are means ± SD. PRBC: Packed red blood cells.

Table 2 Factors that were not found to be significant determinants of a positive angiogram¹

	Positive angiogram (28 patients)	Negative angiogram (73 patients)	t-test P value
Pulse rate	84 ± 17	82 ± 17	0.59
Mean arterial blood pressure	86 ± 14	87 ± 12.1	0.76
Diastolic blood pressure	66 ± 12.4	68 ± 11.6	0.45
Systolic blood pressure	127 ± 23	125.5 ± 19.2	0.59
Hemoglobin	83 ± 19.8	88 ± 18.1	0.59

¹Plus-minus values are means ± SD.

Table 3 Multivariable logistic regression analysis (dependent variable-angiogram outcome)

Independent variables	Coefficient estimate	P-value	OR
Age	0.045	0.017	1.046 (1.008-1.086)
No of PRBC transfused in first 12 h (≥ 4) vs (0-3)	1.423	0.007	4.150 (1.48-11.637)
No of PRBC transfused in first 24 h (≥ 5) vs (0-4)	1.290	0.024	3.640 (1.19-11.125)

PRBC: Packed red blood cells.