Intraprocedural stent thrombosis is a rare but serious complication of reperfusion therapy for acute coronary syndrome. There is currently no consensus on the intraprocedural management of intraprocedural stent thrombosis. It is difficult to attain thrombolysis in myocardial infarction flow grade 3, particularly in cases of cardiogenic shock.
A 49-year-old man who presented with anterior ST-segment elevated acute myocardial infarction with cardiogenic shock underwent emergency percutaneous coronary intervention to diffuse proximal lesions in the left anterior descending artery under the support of intra-aortic balloon pumping. Intraprocedural stent thrombosis occurred following the postdilations with a 3.5- × 38-mm everolimus-eluting stent. Despite administration of argatroban and nitroprusside, and after frequent balloon inflations using 3.5-mm noncompliant balloons and thrombectomy, the no-reflow phenomenon was repetitively established. However, after brief and prolonged balloon inflations using 3.5- and 3-mm Ryusei perfusion balloon catheters (Kaneka Medix), the diffusely protruded thrombus inside the stent regressed, and thrombolysis in myocardial infarction flow grade 3 was obtained. The final intravascular ultrasound image showed a well-suppressed, in-stent thrombus and 24% gain of stent area (from 7.5 to 9.3 mm2).
A Ryusei perfusion balloon enabled frequent, long inflation times without deteriorating hemodynamics during reperfusion in ST-segment elevated acute myocardial infarction complicated with cardiogenic shock. Thus, extended balloon inflation using a perfusion balloon is deemed a viable option not only for intraprocedural stent thrombosis but also for cases with a high burden of thrombi during the primary stenting procedure for patients with acute coronary syndrome.
Background:
The prognostic impact of CHADS
2
, CHA
2
DS
2
-VASc, and CHA
2
DS
2
-VASc-HS scores on clinical outcomes after drug-eluting stent (DES) placement has not been fully elucidated.
Methods and Results:
The present study was a retrospective, non-randomized, single-center, and lesion-based study. Target lesion failure (TLF), comprising cardiac death, non-fatal myocardial infarction, and target vessel revascularization, occurred in 7.1% of 872 consecutive de novo coronary lesions in 586 patients. These patients were electively and exclusively treated by DESs from January 2016 to January 2022 until July 2022 with a mean (±SD) observational interval of 411±438 days. Multivariate Cox proportional hazard analysis revealed that CHA
2
DS
2
-VASc-HS scores ≥7 (hazard ratio [HR] 1.800; 95% CI 1.06–3.05; P=0.029) was a significant predictor of cumulative TLF among 24 variables evaluated. CHADS
2
scores ≥2 (HR 3.213; 95% CI 1.32–7.80; P=0.010) and CHA
2
DS
2
-VASc scores ≥5 (HR 1.980; 95% CI 1.10–3.55; P=0.022) were also significant in the multivariate analysis. Pairwise comparisons of receiver operating characteristic curves for CHADS
2
score ≥2, CHA
2
DS
2
-VASc score ≥5, and CHA
2
DS
2
-VASc-HS score ≥7 showed they were equivalent in terms of predicting the incidence of TLF, with areas under the curve of 0.568, 0.575, and 0.573, respectively.
Conclusions:
All 3 cardiocerebrovascular thromboembolism risk scores were strong predictors of the incidence of cumulative mid-term TLF after elective DES placement, with cut-off values of 2, 5, and 7, respectively, and equivalent prognostic impacts.
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