Keywords: Myocardium, Myocardium, Cardiopulmonary; Second-Hand SmokerProlonged exposure to secondhand tobacco smoke (SHS) is associated with abnormal pulmonary function and cardiovascular response. In this study, we examined cardiac function in SHS-exposed participants using cardiac MR (CMR) and displacement encoding with stimulated echoes (DENSE) to determine whether the cardiac function is affected by air trapping-a hallmark of heavy past SHS exposure. We found that SHS-exposed participants had lower myocardial radial strain than unexposed participants at both end-inspiration and end-expiration imaging. Neither stroke volume nor cardiac output exhibited the decrease seen in unexposed participants at end-inspiration, but radial strain was significantly lower compared to end-expiration in SHS-exposed participants.
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