Laser angioplasty

A novel integrated angioscope-laser system for atherosclerotic carotid artery occlusion: Feasibility and techniques

Introduction

Atherosclerotic extracranial carotid artery stenosis accounts for about 20%-30% of all strokes, which is one of the leading causes of adult morbidity and mortality. Although carotid endarterectomy (CEA) is still the mainly operational manner for atherosclerotic carotid artery stenosis/occlusion (ACAS/ACAO), and carotid angioplasty and stenting (CAS) have been used as an alternative, both CEA and CAS have limitations of their own, such as extensive invasiveness and in-stent restenosis.

Methods

In this study we established a novel interventional system in vitro to take advantage of both CEA and CAS. Twenty consecutive carotid atherosclerotic plaques were harvested from the patients who underwent CEA. The plaques were randomized into two groups and inserted into the pruned and sutured descending aortas of the swine in vitro. The ZebraScope™ was modified with a protective device on its flexible tip, so that the plaque could be dissected from the wall of parent carotid artery and ablated completely without damage to the carotid artery. The holmium:YAG (Ho:YAG) and thulium fiber laser (TFL) generators were alternately used when needed.

Results

All the carotid atherosclerotic plaques were completely ablated by Ho:YAG laser and/or TFL. The Ho:YAG laser was more effective for the atherosclerotic plaques with severe calcification, while the TFL was more suitable for those with moderate calcification. There were still some thermal injury spots on the inner wall of the parent carotid artery caused by the laser in the non-protected group B. In the protected group A, on the contrary, there was no even a thermal injury spot was found on the relevant location except for one sample. The difference of ablating duration was statistically significant between group A (36.5 ± 4.79 min) and group B (63.4 ± 6.55 min) (P < 0.01).

Conclusion

According to our knowledge, this is the first attempt to ablate carotid atherosclerotic plaques assisted by the ZebraScope™ in vitro. The protective and dissecting device on the tip of the angioscope makes it safe and visible when the ablation is performed to carotid atherosclerotic plaques. The Ho:YAG laser and TFL are effective and safe for ablating the plaque in vitro.

Can endovascular therapy of infrainguinal disease for claudication be justified?

Traditionally, patients with exercise-induced lower extremity ischemia (claudicants) have been treated conservatively. It is important to remember that this is not because the pain of claudication is less important than pain due to other problems, but because the only 'cure', operative bypass, has been judged too invasive by both patient and physician. Recent data suggest that endovascular treatment of atherosclerotic disease below the inguinal ligament yields good short-term results, with low periprocedural morbidity and does not compromise future surgical alternatives in the long-term. If this approach is to be used as nonoperative treatment for the pain of claudication, however, the authors suggest that long-term success may be less important than the absolute minimization of short-term and periprocedural risk. The authors believe that given the results of modern endovascular therapy it is increasingly less acceptable to tell claudicants to live with their pain if conservative therapy fails. The option of endovascular treatment for infrainguinal atherosclerotic disease should be discussed with every patient whose claudication is significant, and considered as a treatment option in place of continued pain. This approach should be judged against conservative therapy for claudication, not against surgical bypass for limb threat.

Vibrational angioplasty in the treatment of chronic infrapopliteal arterial occlusions: preliminary experience

PURPOSE

To evaluate the safety and efficacy of vibrational angioplasty in chronic infrapopliteal arterial occlusions.

METHODS

Twelve patients (9 men, aged 54 to 90 years) with 13 below-knee arterial chronic total occlusions were treated percutaneously using vibrational angioplasty. The occlusions were located in the anterior tibial artery (n=5), the tibioperoneal trunk (n=4), the peroneal artery (n=1), the posterior tibial artery (n=1), and in both the tibioperoneal trunk and peroneal artery (n=2). The length of the lesions ranged from 5 to 14 cm.

RESULTS

Recanalization was successful in 12 (92.3%) lesions. In 1 case, the wire perforated the arterial wall; the procedure was abandoned without clinical sequelae. The time to cross the occlusions with the wire ranged from 6 to 19 minutes. No other complications were observed. Clinical follow-up ranged to 18 months. Ten patients with ulceration or gangrene demonstrated good wound healing, and pain was alleviated in all successfully treated patients.

CONCLUSIONS

Vibrational angioplasty appears feasible as a means of safely recanalizing chronic total occlusions of the infrapopliteal arteries. Further experience should be acquired to assess its short- and long-term effects on this vascular territory.