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Impact of transient or persistent slow flow and adjunctive distal protection on mortality in ST-segment elevation myocardial infarction

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Abstract

Routine use of distal protection for ST-segment elevation myocardial infarction (STEMI) is not recommended. The purpose of this study was to analyze the impact of slow flow on mortality after STEMI, and the efficacy of adjunctive distal protection following primary thrombus aspiration. We retrospectively analyzed 414 STEMI patients who underwent primary PCI. Distal protection was used following primary thrombus aspiration only when the operator judged the patient to be at high risk of slow flow. Patients were divided into 3 groups: those receiving no thrombus aspiration (A− Group), thrombus aspiration without distal protection (A+/D− Group) or a combination of aspiration with distal protection (A+/D+ Group). Slow flow/no reflow was characterized as transient or persistent. The A−, A+/D−, and A+/D+ Groups consisted of 28.5 % (n = 118), 44.4 % (n = 184), and 27.1 % (n = 112) of patients, respectively. All-cause mortality at 180 days was 6.8 % without slow flow, 14.1 % with transient and 44.4 % with persistent slow flow (P < 0.0001), but was similar whether or not distal protection was used among these groups complicated without slow flow (A−, 8.7 %; A+/D−, 6.3 %; A+/D+, 4.3 %; P = 0.5854). However, in cases complicated with transient or persistent slow flow, distal protection reduced all-cause mortality to 38.5 % (A−), 23.3 % (A+/D−), and 10.8 % (A+/D+) at 180 days (P = 0.0114). Our data confirm that routine distal protection is not to be recommended. However, it is suggested that it could reduce mortality of patients with slow flow. Predicting slow flow accurately before PCI, however, remains a challenge.

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Authors and Affiliations

  1. Department of Cardiology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, 259-1193, Japan

    Toshiharu Fujii, Naoki Masuda, Masataka Nakano, Gaku Nakazawa, Norihiko Shinozaki, Takashi Matsukage, Nobuhiko Ogata, Fuminobu Yoshimachi & Yuji Ikari

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  1. Toshiharu Fujii
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Correspondence to Yuji Ikari.

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Fujii, T., Masuda, N., Nakano, M. et al. Impact of transient or persistent slow flow and adjunctive distal protection on mortality in ST-segment elevation myocardial infarction. Cardiovasc Interv and Ther 30, 121–130 (2015). https://doi.org/10.1007/s12928-014-0295-z

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  • DOI: https://doi.org/10.1007/s12928-014-0295-z

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