Sternal Anomalies in Asymptomatic Patients after Median Sternotomy and Potential Influencing Factors.

BACKGROUND: We aimed to assess asymptomatic patients who had open-heart surgery with median sternotomy for potential sternal anomalies (SA), their related patient-specific risk factors, and treatment options for the prevention of SA.

METHODS: Multiplanar CT scans (CTs) from 131 asymptomatic consecutive patients were analyzed retrospectively. Of these, 83 underwent CABG (63.4%), and 48 had aortic valve (AV) procedures via median sternotomy. Sternal bone healing was analyzed for SA and their exact location.

RESULTS: In total, 49 SA were identified in 42 (32.1%) patients; 65% SA were found in the manubrium ( n =  32). Five hundred thirty-two wires were implanted (4.2 ± 0.5 wires/patient), out of which 96.1% ( n =  511) were figure 8 wires. There was no difference between normal and abnormal sterna with regard to the number of wires used for sternal closure (4.2 ± 0.5 vs. 4.3 ± 0.6, p =  ns). The distance between wire placement to the proximal edge of the manubrium in normal and abnormal sterna was comparable (11.2 ± 4.2 vs. 10.9 ± 4.8 mm, p =  ns). Patients who underwent CABG had a significantly higher risk for SA (OR  =  2.4, p ≤ 0.05, 95% CI [1.2-4.9]). The use of BIMA (OR  =  4.4, p ≤ 0.05, 95% CI [1.1-17.9]) and body mass index (BMI) > 31 kg/m2 (OR  =  3.4, p ≤ 0.01, 95% CI [1.4-8.3]) significantly increased the risk of SA.

CONCLUSION: At least 30% of patients were at an increased risk for SA after receiving a median sternotomy. CABG, use of BIMA, and a BMI > 30 kg/m2 were potential risk factors for the development of SA and warrant close clinical follow-up. Sternal plate fixation, particularly in the manubrium, could be beneficial in such patients.