Changes in left ventricular function after spontaneous coronary artery dissection

Prior research has shown that spontaneous coronary artery dissection (SCAD) often resolves without surgical intervention. However, the trajectory of left ventricular function after SCAD remains unclear. Established knowledge indicates that SCAD can present with myocardial infarction and wall-motion abnormalities. Yet, the natural history of left ventricular ejection fraction (LVEF) in these patients has not been systematically studied. No prior work had resolved whether LVEF improves after initial SCAD diagnosis. This gap motivated the current analysis of longitudinal ventricular function in a large SCAD cohort. The uncertainty around recovery patterns in SCAD patients is significant, as it influences clinical decision-making. No prior work had resolved the frequency of LVEF normalization in this population. The absence of detailed follow-up data in SCAD studies highlights the need for this investigation.

The aim of this study was to evaluate changes in left ventricular function following spontaneous coronary artery dissection (SCAD). The specific problem addressed is the lack of data on how left ventricular ejection fraction (LVEF) and wall-motion abnormalities (WMA) evolve after SCAD diagnosis. The motivation stems from the clinical observation that many SCAD patients present with myocardial infarction and abnormal ventricular function. This uncertainty drives the need to understand whether these abnormalities resolve over time. The study sought to determine if LVEF improves after initial SCAD presentation. The motivation is to provide evidence-based insights into SCAD prognosis. The specific problem involves identifying predictors of LVEF recovery in SCAD patients. This uncertainty is critical for guiding treatment and follow-up strategies in SCAD management.

The study included patients with non-atherosclerotic SCAD who were prospectively followed at Vancouver General Hospital. Baseline assessments of left ventricular ejection fraction (LVEF) and wall-motion abnormality (WMA) were obtained during the initial presentation. A subset of these patients underwent repeat ventricular function assessments at follow-up. The researchers compared baseline LVEF and WMA with follow-up measurements. They also correlated these findings with long-term cardiovascular outcomes. The study population consisted of 277 SCAD patients with baseline ventricular assessments. Of these, 164 had follow-up evaluations of LVEF and WMA. Statistical analysis was used to determine the significance of changes in LVEF and WMA over time.

The average age of the 277 SCAD patients was 52.4 ± 9.4 years, with 90.3% being female. At baseline, the mean LVEF was 55.6% ± 9.1%, and 26% had LVEF below 50%. Wall-motion abnormalities were observed in 85.6% of cases. Among 164 patients with follow-up assessments, LVEF improved from 54.6% ± 9.2% at baseline to 60.7% ± 7.2% at follow-up (P < 0.001). The proportion of patients with LVEF <50% decreased from 29.9% at baseline to 6.7% at follow-up (P < 0.001). Wall-motion abnormalities also decreased from 87.2% at baseline to 44.5% at follow-up (P < 0.001). Multivariable analysis identified STEMI presentation, troponin I >50 µg/L, and LAD involvement as predictors of baseline LVEF <50%.

The authors observed that the majority of SCAD patients presented with wall-motion abnormalities and had relatively normal LVEF. Over half of the patients showed normalization of both LVEF and wall-motion abnormalities at follow-up. These findings suggest that left ventricular dysfunction in SCAD may improve over time. The study highlights the importance of follow-up assessments in SCAD patients. The results indicate that LVEF recovery is common after initial SCAD presentation. The observed improvements in LVEF and wall-motion abnormalities support the hypothesis that ventricular function may heal spontaneously. The study also identified clinical predictors of baseline LVEF <50%. These findings may inform clinical management and expectations for SCAD patients.