Impact of sarcopenia on the outcomes of elective total arch replacement in the elderly

OBJECTIVES: The purpose of this study was to identify the cut-off value of sarcopenia based on the psoas muscle area index and evaluate early and late outcomes following elective total arch replacement in the elderly. METHODS: Sarcopenia was assessed by the psoas muscle area index [defined as the psoas muscle area at the L3 level on computed tomography (cm(2))/body surface area (m(2))]. The cut-off value for sarcopenia was defined as > 2 standard deviations below the mean psoas muscle area index value obtained from 464 normal control patients. Between October 1999 and July 2015, 266 patients who were >= 65 years and had undergone psoas muscle area index measurement underwent elective total arch replacement. These patients were classified into the sarcopenia (Group S, n = 81) and non-sarcopenia (Group N, n = 185) groups. RESULTS: The mean age was 76.2 +/- 5.6 years in Group S and 75.7 +/- 5.7 years in Group N (P = 0.553). Hospital mortality was 3.7% (3/81) in Group S and 2.2% (4/185) in Group N (P = 0.483). Mean follow-up was 48.3 +/- 38.7 months. Five-year survival was significantly worse in Group S (S: 63.2 +/- 6.6% vs N: 88.7 +/- 2.6%, P < 0.001). A multivariable Cox proportional hazard analysis showed that sarcopenia significantly predicted poor survival (hazard ratio 2.59; 95% confidence interval 1.27-5.29; P = 0.011). CONCLUSIONS: Sarcopenia did not predict hospital death following total arch replacement, but it was negatively associated with overall survival. Sarcopenia can be an additional risk factor to estimate the outcomes of thoracic aortic surgery.