Purpose: Chronic obstructive pulmonary disease (COPD) is a known comorbidity of takotsubo cardiomyopathy (TCM), and COPD exacerbation is a potential triggering factor of TCM. The association between COPD and in-hospital outcomes and complications among TCM patients is not well established. We sought to assess the effect of COPD on hospitalized patients with a primary diagnosis of TCM.
Methods: We conducted a retrospective cohort study in patients with a primary diagnosis of TCM with or without COPD using the latest National Inpatient Sample from 2016– 2017. We identified 3139 patients admitted with a primary diagnosis of TCM by the ICD-10-CM coding system; 684 of those patients also had a diagnosis of COPD. We performed propensity score matching in a 1:2 ratio (n=678 patients, matched COPD group; n=1070, matched non-COPD group) and compared in-hospital outcomes and complications between TCM patients with and without a COPD diagnosis.
Results: Before matching, the COPD group had worse outcomes compared with the non-COPD group in inpatient death (2.9% vs 1.3%, p=0.006), length of stay (LOS) (4.02± 2.99 days vs 3.27± 3.39 days, p< 0.001), hospitalization charges ($55,242.68± 47,637.40 vs $48,316.97± 47,939.84, p=0.001), and acute respiratory failure (ARF) (22.5% vs 7.7%, p< 0.001), respectively. After propensity score matching, the matched COPD group, compared with the matched non-COPD group, had a higher inpatient mortality rate (2.9% vs1.0%, p=0.005), longer LOS (4.02± 3.00 days vs 3.40± 3.54 days, p< 0.001), higher hospitalization charges ($55,409.23± 47,809.13 vs $46,469.60± 42,209.10, p< 0.001), and a higher incidence of ARF (22.6% vs 8.2%, p< 0.001) and cardiogenic shock (5.6% vs 3.3%, p=0.024), respectively.
Conclusion: Patients with COPD who are hospitalized for TCM have higher rates of inpatient mortality, ARF, cardiogenic shock, as well as a longer LOS, and higher charges of stay than those without COPD. Prospective studies are warranted to examine the effect of early intervention or treatment of COPD on short- and long-term outcomes of TCM.
Keywords: takotsubo cardiomyopathy, chronic obstructive pulmonary disease, in-hospital outcomes