Key result
Low-speed following high-speed rotational atherectomy achieved a significantly larger minimum lumen diameter in human lesions compared to high-speed alone (1.22 vs 1.07 mm; p=0.0078).
Why the study?
The association between platform speed and acute lumen gain during rotational atherectomy remains unknown.
Does low-speed rotational atherectomy following high-speed rotational atherectomy improve minimum lumen diameter and area compared to high-speed rotational atherectomy alone in calcified lesions?
Observational (n=30)
Does low-speed rotational atherectomy following high-speed rotational atherectomy improve minimum lumen diameter and area compared to high-speed rotational atherectomy alone in calcified lesions?
The combination of low-speed and high-speed rotational atherectomy is a safe and feasible strategy that achieves larger acute lumen gain in severely calcified lesions compared to high-speed atherectomy alone.
Answers are grounded in this paper and cite their sources.
May support combined low- and high-speed rotational atherectomy for greater lumen gain in calcified lesions; hypothesis-generating pending randomized confirmation.
Background. While the evaluation of burr speed was discussed regarding platelet aggregation, the association between platform speed and acute lumen gain of rotational atherectomy remains unknown. Methods. Through the evaluation of the potential of low-speed rotational atherectomy (LSRA) in in-vitro experiments, minimum lumen diameter (MLD) and minimum lumen area (MLA) after conventional high-speed rotational atherectomy (HSRA group) and those after LSRA following HSRA (LSRA+HSRA group) treated by 1.5 mm burrs were measured by optical frequency domain imaging (OFDI) in 30 consecutive human lesions. Results. The in-vitro experiments demonstrated that MLD and MLA after LSRA+HSRA were significantly larger (MLD: LSRA+HSRA=1.50 ±0.05 mm, HSRA= 1.43 ±0.05 mm, p=0.015; MLA: LSRA+HSRA= 1.90 ±0.17 mm2, HSRA= 1.71±0.11 mm2, and p= 0.037), requiring more crossing attempts (LSRA= 134 ±20 times, HSRA= 72 ±11 times, and p< 0.001). In human studies, there was no significance in reference vessel diameter and lesion length before the procedure between two groups. MLDs after LSRA+HSRA were significantly larger than those in HSRA (LSRA+HSRA= 1.22 ±0.16 mm, HSRA= 1.07 ±0.14 mm, and p= 0.0078), while MLAs after LSRA+HSRA tended to be larger (LSRA+HSRA= 1.79 ±0.51 mm2, HSRA= 1.55 ±0.47 mm2, and p= 0.19). There was no significance in the occurrence of in-hospital complication, including slow flow or no reflow, major dissection, and procedural myocardial infarction, between LSRA+HSRA and HSRA. Conclusions. LSRA can achieve larger lumen gain compared, whereas HSRA can pass calcified lesions easily. Combination of LSRA and HSRA is a safe and feasible strategy for severely calcified lesions in clinical practice.
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Yamamoto et al. (2019) conducted an observational in Severely calcified coronary lesions (n=30). Low-speed rotational atherectomy (LSRA) following high-speed rotational atherectomy (HSRA) vs. Conventional high-speed rotational atherectomy (HSRA) was evaluated on Minimum lumen diameter (MLD) (p=0.0078). Low-speed following high-speed rotational atherectomy achieved a significantly larger minimum lumen diameter in human lesions compared to high-speed alone (1.22 vs 1.07 mm; p=0.0078).
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