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Spontaneous coronary artery dissection (SCAD) is a rare cause of acute coronary syndrome. Multivessel (MV) SCAD is a challenging clinical presentation that might be associated to a worse prognosis compared with patients with single-vessel (SV) involvement.The Spanish multicentre nationwide prospective SCAD registry included 389 consecutive patients. Patients were classified, according to the number of affected vessels, in SV or MV SCAD. Major adverse events (MAE) were analyzed during hospital stay and major cardiac or cerebrovascular adverse events (MACCE) at long-term clinical follow-up.A total of 41 patients (10.5%) presented MV SCAD. These patients had more frequently a previous history of hypothyroidism (22% vs 11%, p = 0.04) and anxiety disorder (32% vs 16%, p = 0.01). MV SCAD patients presented more often as non-ST segment elevation myocardial infarction (73% vs 52%, p = 0.01) and showed less frequently type 1 angiographic lesions (12% vs 21%, p = 0.04). An impaired initial Thrombolysis In Myocardial Infarction (TIMI) flow 0-1 was less frequent (14% vs 29%, p 0.01) in MV SCAD. In both groups, most patients were treated conservatively (71% vs 79%, p = NS). No differences were found regarding in-hospital MAE or MACCE at late follow-up (median 29 ± 11 months). However, the rate of stroke was higher in MV SCAD patients, both in-hospital (2.4% vs 0%, p 0.01) and at follow-up (5.1% vs 0.6%, p = 0.01).Patients with MV SCAD have some distinctive clinical and angiographic features. Although composite clinical outcomes, in-hospital and at long-term follow-up, were similar to those seen in patients with SV SCAD, stroke rate was significantly higher in patients with MV SCAD.

Thrombocytopenia is a common, yet poorly understood, complication after transcatheter aortic valve replacement (TAVR). Balloon-expandable transcatheter heart valve has been associated with higher incidence of thrombocytopenia, compared with self-expandable valves. The aim of this study was to analyze the incidence, clinical impact and predictors of acquired thrombocytopenia in patients undergoing TAVR.We performed an observational study from consecutive patients with severe aortic stenosis undergoing TAVR (n = 679) in a single center. Association and best cut-off point of platelet decrease with early mortality was analyzed. Patients were classified according to postprocedural percentage decrease in platelet count (PDPC), comparing clinical outcomes and analyzing predictors of platelet decrease.The median PDPC was 37.1 [IQR: 27.4-46.9]. PDPC was associated with early mortality (OR: 2.1, 95%IC: 1.7-2.5 for each 10% decrease, AUC:0.81, 95%CI:0.72-0.89) with an optimal cut-off point of 46%. PDPC≥46% and late nadir (≥4 days) were both independent predictors of early mortality (OR: 6.0 [IQR: 2.4-14.9] and OR: 5.1 [IQR: 2.2-11.6], respectively). The combination of both factors (PDPC≥46% and nadir ≥4 day) was associated with higher 2-year mortality (55.7%) compared to an early significant nadir (PDPC≥46% and nadir4 day, 28.9%) and non-significant nadir (PDPC46%, 21.0%), p 0.001. Independent predictors of PDPC≥46% were baseline platelet count, Portico™, Abbott valve, intraprocedural major vascular complication and residual aortic regurgitation ≥grade 2.The platelet count decreased almost 40% after TAVR. Late nadir and PDPC≥46% predicted short-term clinical outcomes. Concomitant late and significant platelet decrease was associated with mid-term mortality.

Background The physiopathology underlying spontaneous coronary artery dissection remains largely unknown. Endothelial dysfunction is an early feature of many vascular disorders. We sought to determine the endothelial function assessed by reactive hyperemia peripheral arterial tonometry (RH-PAT) in patients with SCAD and compare it to that of non-SCAD patients with similar cardiovascular risk profile. Methods This is a case-control study with the participation of 2 centers. Patients (cases) were diagnosed with SCAD between 2008 and 2018. Control subjects were individually matched 2:1 to SCAD cases from a cohort recruited for assessment with RH-PAT between 2006 and 2013. The primary measure variable was the mean difference in the log-transformed reactive hyperemia index (LnRH-PAT Index) between groups. Results LnRH-PAT data from 23 patients with SCAD and 46 matched controls were analyzed. No significant differences were noted in the matching variables (overall, 95.7% female with mean age 52.7 years). In the SCAD group, more patients reported migraine (61 vs. 21%) and more patients were on betablockers (70 vs 28%), ACE inhibitors (65 vs. 13%) and statins (70 vs. 28%), all differences statistically significant. The mean LnRH-PAT value was 0.55 ± 0.22 in patients with SCAD and 0.77 ± 0.23 in controls (mean difference: 0.22, p Conclusions In this observational study, patients with SCAD had a poorer endothelial function than similar subjects without prior SCAD. This finding opens a new venue in the research of the physio pathologic mechanisms underlying SCAD.