Table 3.

Univariate Analysis of Risk Factors for Ischemic Complications after Mastectomy with Immediate Breast Reconstruction Including the Mastectomy Flap Ischemia Risk Score

Variable	Total Mastectomies (N)	Mastectomies with Ischemic Complication (%)	Unadjusted OR (95% CI)	P
No.	45		–	–
Age
<50 y	24	7 (29.2%)	1.8214 (0.5305–6.2540)	0.3407
≥50 y	21	9 (42.9%)
BMI
<30 kg/m2	29	8 (27.6%)	2.6250 (0.7341–9.3864)	0.1377
≥30 kg/m2	16	8 (50.0%)
Current smoking
Yes	2	1 (50.0%)	1.8667 (0.1089–32.0108)	0.6669
No	43	15 (34.9%)
Therapeutic indication
Yes	28	12 (42.9%)	2.4375 (0.6334–9.3803)	0.1950
No	17	4 (23.5%)
Sentinel lymph node biopsy performed
Yes	19	10 (52.6%)	3.7037 (1.0278–13.3467)	0.0453
No	26	6 (23.1%)
Axillary lymph node dissection performed
Yes	7	1 (14.3%)	0.2556 (0.0279–2.3406)	0.2273
No	38	15 (39.5%)
Prior radiation
Yes	6	3 (50.0%)	2.0000 (0.3534–11.3186)	0.4332
No	39	13 (33.3%)
Prior chemotherapy
Yes	18	6 (33.3%)	0.8500 (0.2427–2.9763)	0.7994
No	27	10 (37.0%)
Adjuvant radiation
Yes	7	2 (28.6%)	0.6857 (0.1171–4.0151)	0.6756
No	38	14 (36.8%)
Adjuvant chemotherapy
Yes	6	0 (0.0%)	0.1096 (0.0058–2.0819)	0.1410
No	39	16 (41.0%)
Nipple-sparing mastectomy
Yes	3	0 (0.0%)	0.2294 (0.0111–4.7313)	0.3404
No	42	16 (38.1%)
Implant-based reconstruction
Yes	29	11 (37.9%)	1.3444 (0.3678–4.9146)	0.6545
No	16	5 (31.3%)
Acellular dermal matrix
Yes	20	7 (35.0%)	0.6731 (0.1353–3.3474)	0.6286
No	9	4 (44.4%)
Sternal notch–nipple distance ≥25 cm
Yes	13	7 (53.8%)	2.1875 (0.5462–8.7612)	0.2689
No	23	8 (34.8%)
Nipple–inframammary fold distance ≥10 cm
Yes	15	6 (40.0%)	0.8889 (0.2312–3.4181)	0.8639
No	21	9 (42.9%)
Mastectomy flap ischemia risk score >5
Yes	9	5 (55.6%)	2.8409 (0.6378–12.6541)	0.1707
No	36	11 (30.6%)
Mastectomy flap ischemia risk score >6
Yes	6	4 (66.7%)	4.5000 (0.7229–28.0120)	0.1069
No	39	12 (30.8%)
Mastectomy flap ischemia risk score >7
Yes	4	3 (75.0%)	6.4615 (0.6120–68.2200)	0.1207
No	41	13 (31.7%)

Bold text indicates a significant P value.

BMI, body mass index.