Feasibility of day-case pediatric cochlear implantation

PURPOSE

Pediatric cochlear implantation is performed on an outpatient basis in an inconstant way. The aim of this study is to assess the feasibility of day-case pediatric cochlear implantation by determining the acceptability of outpatient-to-inpatient conversion rate (acceptability threshold of 5%) and to assess the safety by comparing outpatient and inpatient postoperative events. We also want to identify conversion predictive factors.

METHODS

We conducted a monocentric retrospective study including 267 cases aged 6 months to 18 years who underwent unilateral cochlear implantation between 2016 and 2020. This population was divided into two groups: outpatient group (190 cases) and inpatient group (77 cases).

RESULTS

Among the 190 cases scheduled as day surgery, 9 cases required conversion to conventional hospitalization which leads to an outpatient-to-inpatient conversion rate of 4.7%. Postoperative nausea and vomiting (PONV) were involved in all cases of conversion. Conversion predictive factors were the presence of an inner ear malformation at risk of gusher (OR 32.51, 95% CI [4.98-370.27], p 0.001) and the intraoperative administration of morphine (OR 8.52, 95% CI [1.38-86.84], p 0.035). There was no statistically significant difference in immediate postoperative complications (outpatient 14.2% vs inpatient 16.9% p 0.715), early-stage complications (outpatient 12.6% vs inpatient 10.4% p 0.812) and early-stage unplanned consultations (outpatient 4.7% vs inpatient 3.9% p 0.748) between outpatient and inpatient groups. Unplanned readmissions were found only in the outpatient group.

CONCLUSION

Day-case pediatric cochlear implantation is a feasible and safe procedure even in infants. The outpatient-to-inpatient conversion rate of 4.7% is considered acceptable but requires anticipation of human and accommodation needs. No causes of conversion were life-threatening. The risk of postoperative complications and unplanned consultations are not influenced by the mode of hospitalization. Special attention should be paid to the prevention of PONV and the presence of inner ear malformations.

Carotid Stenting with Cerebral Protection: First Clinical Experience Using the PercuSurge GuardWire System

Purpose:

To study the feasibility and safety of carotid angioplasty and stenting using a new cerebral protection device that temporarily occludes the distal internal carotid artery (ICA).

Methods:

Forty-eight high-risk patients (39 men, mean age 69.1 ± 8 years, range 54 to 86) with 53 ICA stenoses underwent percutaneous angioplasty and stenting via the femoral approach under cerebral protection afforded by a 0.014-inch GuardWire balloon occlusion device. Mean stenosis was 82.1% ± 9.65% (range 70 to 96) and mean lesion length was 16.0 ± 7.5 mm (range 6 to 50). Thirty-three (62%) lesions were calcified, and 38 (72%) were ulcerated. Thirty-two (60%) of the lesions were asymptomatic. With the occlusion balloon inflated in the distal ICA, the lesion was dilated and stented. The area was cleaned by aspiration and flushed via an aspiration catheter advanced over the wire. Blood samples were collected from the external carotid artery (ECA) and analyzed to measure the size and number of particles collected. Computed tomography and neurological examinations were performed the day after the procedure.

Results:

Immediate technical success was achieved in all patients with the implantation of 38 Palmaz stents, 8 Expander stents, and 11 Wallstents. Carotid occlusion was well tolerated in all patients but 1 who had multiple, severe carotid lesions and poor collateralization. Mean cerebral flow occlusion time was 346 ± 153 seconds during predilation and 303 ± 143 seconds during stent placement. Total mean flow occlusion time was 542 ± 243 seconds. One immediate neurological complication (transient amaurosis) occurred in a patient who had an anastomosis between the external carotid (EC) and ICA territories. Debris was removed in all patients with a mean 0.8-mm diameter catheter.

Conclusion:

Cerebral protection with the GuardWire device is easy, safe, and effective in protecting the brain from cerebral embolism. Larger studies are warranted.

Renal angioplasty and stenting: is it still indicated after ASTRAL and STAR studies?

A renal artery stenosis (RAS) is common among patients with atherosclerosis, up to a third of patients undergoing cardiac catheterization. Fibromuscular dysplasia is the next cause of RAS, commonly found in young women. Atherosclerosis RAS generally progresses overtime and is often associated with loss of renal mass and worsening renal function (RF). Percutaneous renal artery stent placement is the preferred method of revascularization for hemodynamically significant RAS according to ACC and AHA guidelines. Several randomized trials have shown the superiority of endovascular procedures to medical therapy alone. However, two studies ASTRAL and STAR studies were recently published and did not find any difference between renal stenting and medical therapy. But these studies have a lot of limitations and flaws as we will discuss (poor indications, poor results, numerous complications, failures, poor technique, inexperienced operators, ecc.). Despite these questionable studies, renal stenting keeps indications in patients with: uncontrolled hypertension; ischemic nephropathy; cardiac disturbance syndrome (e.g. "flash" pulmonary edema, uncontrolled heart failure or uncontrolled angina pectoris); solitary kidney. To improve the clinical response rates, a better selection of the patients and lesions is mandatory with: good non-invasive or invasive imaging; physiologic lesion assessment using transluminal pressure gradients; measurements of biomarkers (e.g., BNP); fractional flow reserve study. A problem remains after renal angioplasty stenting, the deterioration of the RF in 20-30% of the patients. Atheroembolism seems to play an important role and is probably the main cause of this R.F deterioration. The use of protection devices alone or in combination with IIb IIa inhibitors has been proposed and seems promising as shown in different recent reports. Renal angioplasty and stenting is still indicated but we need: a better patient and lesion selection; improvements in techniques and maybe the use of protection devices to reduce the risk of RF deterioration after renal stenting.

How to avoid complications associated with carotid angioplasty and stenting

Carotid angioplasty and stenting (CAS) has been proposed as an alternative to surgery and is now performed more frequently and is well accepted, at least for high surgical risk patients. However, complications and particularly embolic strokes, even with a meticulous technique, can occur at any step of the procedure. Silent embolism is detected after CAS and may be a problem that needs to be discussed. To avoid and reduce these complications associated with CAS, it is important to have good indications dependent upon on good patient and lesions selection, as well as correct technique. New parameters have been proposed, particularly for asymptomatic lesions. The authors consider that embolic protection devices (EPDs) are mandatory for CAS, and new techniques will be presented. The choice of the EPD depends on the clinical status of the patient, the lesion morphology and characteristics, and the anatomy of the artery. All stents are not equivalent and so a good choice of the stent is necessary to avoid and reduce the complications associated with CAS, and experienced operators are also needed. With all these considerations, CAS can now be performed with acceptable outcomes and in certain population the results are comparable or superior to surgery. The results of ongoing randomized trials are awaited.

Carotid angioplasty and stenting: how to avoid complications

Carotid angioplasty and stenting (CAS) has been proposed as an alternative to surgery and is now more and more performed and well accepted, at least for high surgical risk patients. However complications and particularly embolic strokes, even with a meticulous technique, can occur at any step of the procedure. Silent embolism is detected after CAS and may be a problem that needs to be discussed. To avoid and reduce these complications associated with CAS we must have: good indications depending on good patients and lesions selection. New parameters have been proposed particularly for asymptomatic lesions, correct technique, embolic protection devices (EPD) are mandatory for any CAS. New techniques will be presented. The choice of the EPD depends on the clinical status of the patient, the lesion morphology and characteristics, the anatomy of the artery, good choice of the stent and correct implantation (all stents are not equivalent), pharmacological adjuncts, experienced operators, good team. With all these considerations CAS can now be performed with acceptable outcomes and in certain population the results are comparable or superior to surgery. The results of ongoing randomized trials are awaited.

Embolic protection for renal artery stenting

A renal artery stenosis (RAS) is frequent and usually caused by atherosclerosis. Percutaneous renal artery angioplasty (PTRA) and stenting gives good immediate and long-term

RESULTS

Concern has arisen in the postprocedural deterioration of the renal function (RF), which may occur in 20-40% of the patients therefore limiting the immediate benefits of the technique. Atheroembolism seems to play an important role in postprocedural deterioration. The authors postulated that the use of renal embolic protection devices could reduce the risk of renal embolism and avoid deterioration of the RF. One hundred forty-eight PTRA and stenting procedures were performed under protection in 121 hypertensive patients (M: 85), mean age: 64.5+/-11.8 years (22-87) with atherosclerotic renal artery stenosis. Eleven patients had solitary kidneys and 48 had renal insufficiency. Both occlusion balloons (N=46) and filters (N=95) were used. Of the 95 filters, the new FiberNet EP system (Lumen Biomedical) was included. This filter has the ability to capture particles as small as 30-40 microns without compromising flow. Generated debris was then removed and analysed, and blood pressure and serum creatinine levels were followed. Immediate technical success: was achieved in 100% os the cases. 112/141 lesions were stented directly. Visible debris with Percusurge (Medtronic) was aspirated and removed under aspiration from all patients and in 80% of the cases with filters. Debris was aspirated in 100% of the cases completed with the FiberNet). The mean particulate retrieved with the Percusurge system was 98.1+/-60.0 mu with a mean diameter ranging from 201+/-76 m (38-6 206). Mean occlusion time was 6.55+/-2.46 min and mean time in situ (filters) 4.2+/-1.1 min. Five times more particulate was removed with the FiberNet than with current available filters. One acute RF deterioration was observed. The mean follow-up was 29.6+/-14 months and the mean creatinine level remained constant during follow-up. At 6 months (101 patients) one deterioration of the RF in a patient with renal insufficiency at baseline was observed, 25 improvements in patients with renal insufficiency were noted, and 73 stabilizations. In conclusion 99% of the patients were stabilized or improved. After 2 years (84 patients) 95% of the patients remained stabilized (N=60) or showed improvements (N=20), and 4 patients had deterioration of RF (5%). The preliminary results suggest the feasibility and safety of distal protection during renal interventions to protect against atheroembolism and consequential deterioration of RF after the procedure. The beneficial effects of this technique should be evaluated further in randomized studies.

Percutaneous transluminal angioplasty of the subclavian arteries

AIM

The aim of this study was to review the feasibility, safety and long-term results of subclavian artery (SA) angioplasty.

METHODS

Over 14 years, 237 patients (males: 135; mean age: 64+/-12 years) underwent percutaneous treatment for SA occlusive disease. Indications for treatment were upper limb ischemia (n=125), vertebrobasilar insufficiency (n=128), coronary steal (n=11) and anticipated coronary bypass surgery in asymptomatic patients (n=26). A total of 192 arteries were stenosed and 45 occluded. Mean percentage stenosis was 81.9+/-7.6% and mean lesion length was 23.8+/-8.8 mm. Percutaneous techniques included retrograde femoral (n=163), brachial artery (n=47) access or both (n=14) and in 4 cases the ''pull through technique''. An isolated balloon angioplasty was performed in 59 cases. We implanted 132 balloon expandable stents and 32 self-expandable stents.

RESULTS

Technical success was obtained in 223 lesions (94%). Only 31 occlusions were recanalized (69%). Four periprocedural events occurred (1.2%), 1 major (fatal) stroke, 1 transient ischemic attack and 2 arterial thromboses. At follow-up (mean follow-up: 65.8+/-33.5 months), we had 27 restenoses (12%). Thirteen occurred following angioplasty alone (18.8%) and 14 following angioplasty and stent implantation (8.4%). Primary (PI) and secondary (PII) patencies on an intention to treat basis at 10-year follow-up were 78.1% and 84.5%, respectively. In patients without initial stent placement, the rates were 67.5% and 75.5%, while in those with stents the rates rose to 89.7% and 96.9% (P<0.01). PI for all recanalized lesions were 84.6%, 79.1% without stent, 89.7% with stent (P<0.04) and PII 91.6%, 88.5%, 96.9%, respectively (P<0.02).

CONCLUSION

Percutaneous transluminal angioplasty is currently the treatment of choice for SA lesions. It is a safe and effective procedure associated with low risks and good long-term results. Stents seem to limit the restenosis rate and improve long-term results.

Recent advances in renal artery stenting

Renal artery stenosis (RAS) is frequent and increasingly recognized thanks to technical improvements in duplex ultrasound, magnetic resonance angiography, computed tomography (CT) scanning, systematic renal angiography during cardiac catheterisation, coronary procedures and particularly in hypertensive or multivascular diseased patients. Renal artery angioplasty and stenting is the first treatment to be proposed for patients suffering from RAS. This procedure is largely performed with very good technical results, good anatomical results, a low complication rate and a good long-term patency. The technique has proven to be beneficial for preserving RF and stabilizing or improving BP in a large number of patients. Nevertheless, deterioration in RF after the procedure in 20-30% of cases may limit the immediate benefits of this technique. Atheroembolism seems to play an important role. Renal angioplasty with protection devices seems a promising technique that might become the standard of care in the future. Even so, some problems remain: the cost of the technique; the best protection device needs to be determined; protection devices specifically designed for the renal arteries are needed; indications have to be specified. Larger, randomised studies are awaited to confirm the usefulness of the technique.

Carotid angioplasty and stenting under protection. State of the art

A carotid stenosis is responsible for about 30% of strokes occurring. Carotid endarterectomy (CEA) is considered to be the gold standard treatment of a carotid stenosis. Carotid angioplasty and stenting (CAS) is emerging as a new alternative treatment for a carotid artery stenosis, but the risk of neurological complications and brain embolism remain the major drawback to this procedure. So as to reduce the risk, we need: good indications, good patient and lesion selection; correct techniques; brain protection devices (cerebral protection devices should be routinely used and are mandatory for any procedure. Three types of protection devices are available: filters are the most commonly used. Nevertheless, all protection devices have limitations and cannot prevent from embolic events. However neurological complications can be reduced by 60%. New protection devices will be discussed); good choice of the stent and correct implantation (all stents are not equivalent and have different geometrical effects); pharmacological adjuncts; good team. Indications are well accepted for high-risk patients and recent studies have shown that CAS has superior short-term outcomes than CEA in this group of patients. Indications for low-risk and asymptomatic patients are controversial. New selection criteria have to be discussed. But there are enough reported data to conclude that CAS is also not inferior to CEA in low-risk and asymptomatic patients. In our series of 844 procedures, without protection (n = 187) 30-day death and stroke rate was 3.7% and with protection (n = 657) 1% (1.3% for symptomatic patients, 0.9% for asymptomatic patients, 1.4% in high-risk patients, 0.4% in low-risk patients). CAS under protection is the standard of care and is maybe becoming the gold standard treatment of a carotid stenosis at least in some subgroups of patients.

Carotid angioplasty and stenting under protection. Techniques, results and limitations

A carotid stenosis is responsible for about 30% of strokes occurring. Carotid endarterectomy (CEA) is considered to be the gold standard treatment of a carotid stenosis. Carotid angioplasty and stenting (CAS) is emerging as a new alternative treatment for a carotid artery stenosis, but the risk of neurological complications and brain embolism remains the major drawback to this procedure. Therefore, in order to reduce the risks, we need: 1) good indications, good patient and lesion selection; 2) correct techniques; 3) brain protection devices (cerebral protection devices should be routinely used and are mandatory for any procedure); 4) 3 types of protection devices are available, but filters are the most commonly used (all protection devices have limitations and cannot prevent from all embolic events; however, neurological complications can be reduced by 60%); 5) a good choice of the stent and correct implantation (all stents are not equivalent and have different geometrical effects); 6) pharmacological adjuncts; 7) a good team. Recent studies have shown that CAS has superior short-term outcomes than CEA in high surgical risk patients, but there are enough reported data to conclude that CAS is also not inferior to CEA in low-risk patients. CAS under protection is the standard of care and is maybe becoming the gold standard treatment of a carotid stenosis at least in some subgroups of patients.

Percutaneous transluminal angioplasty using a new peripheral cutting balloon for stenosis of arch vessels in aorto arteritis

Percutaneous transluminal angioplasty (PTA) with or without stenting of steno-occlusions in the supra-aortic arch vessels in aortoarteritis is associated with higher residual stenosis and restenosis, particularly in those with diffuse disease. The use of the new peripheral cutting balloon (Boston Scientific Interventional Technologies, San Diego, CA, USA) in these lesions in aortoarteritis has not been described. We report here the first 2 cases of stand alone cutting angioplasty for 2 patients (3 arteries). One patient presented with a critical stenosis of the common carotid artery. We obtained a good immediate result but a restenosis appeared at 6 months, easily treated by a new angioplasty with cutting balloon and stent implantation. The second patient had an occlusion of the subclavian artery associated with a severe ostial vertebral artery stenosis. The immediate result was excellent and the 6-month clinical and angiographic control showed no restenosis.

Protected renal stenting with the PercuSurge GuardWire device: a pilot study

PURPOSE

To evaluate the feasibility and safety of renal artery angioplasty and stenting utilizing a distal protection device to reduce the risk of intraprocedural atheroembolism.

METHODS

Twenty-eight hypertensive patients (18 men; mean age 71.3 +/- 8.6 years, range 49-87) with atherosclerotic renal artery stenosis (4 bilateral) underwent angioplasty and stenting with distal protection in 32 renal arteries (29 ostial lesions). The lesion was crossed with a GuardWire temporary occlusion balloon, which was inflated to provide parenchymal protection. Generated debris was aspirated and analyzed. Blood pressure and serum creatinine levels were followed.

RESULTS

Immediate technical success was 100%. All lesions were stented, either directly (14 ostial lesions), after predilation (15 ostial lesions), or owing to suboptimal angioplasty (3 nonostial lesions). Visible debris was aspirated from all patients. Mean particle number and diameter were 98.1 +/- 60.0 per procedure (range 13-208) and 201.2 +/- 76.0 microm (range 38-6206), respectively. Mean renal artery occlusion time was 6.55 +/- 2.46 min (range 2.29-13.21). Mean follow-up was 6.7 +/- 2.9 months (range 2-17). Systolic and diastolic blood pressure declined from 167.0 +/- 15.2 and 103.0 +/- 12.0 mm Hg, respectively, to 154.7 +/- 12.3 and 93.2 +/- 6.8 mm Hg after the procedure. The mean creatinine level dropped from 1.34 +/- 0.35 mg/dL preprocedurally to 1.22 +/- 0.36 mg/dL at 24 hours and remained constant. At 6-month follow-up, renal function did not deteriorate in any patient, whereas 5 patients with baseline renal insufficiency improved after the procedure.

CONCLUSIONS

These preliminary results suggest the feasibility and safety of distal balloon occlusion during renal interventions to protect against atheroembolism. This technique's beneficial effects should be evaluated by randomized studies.

Angioplasty and stenting of the extracranial carotid arteries

We performed percutaneous transluminal angioplasty and stenting in patients with carotid artery stenosis to determine the efficacy of these techniques as an alternative to surgical endarterectomy. From April 1995 through July 1999, 315 carotid angioplasty procedures were performed (right, 151; left, 164) in 290 patients ranging in age from 40 to 93 years. Of these patients, 42% were symptomatic and 58% were asymptomatic. Twenty-five patients underwent bilateral procedures. The mean percentage of stenosis was 82.3%+/-8.7% SD. Angioplasty and stenting were performed without cerebral protection in 165 arteries and with protection in 150. Two methods of protection were used: the Theron technique and the PercuSurge Guardwire temporary occlusion and aspiration system. Balloon dilation and stent placement were successful in 289 patients; in the last patient, severe arterial tortuosity prevented catheterization and stenting. We observed 13 periprocedural neurologic complications due to ischemia (4.2%): 4 transient ischemic attacks (1.3%), 4 minor strokes (1.3%), and 5 major strokes (1.6%), including 1 death. At 6 months, 210 patients had a follow-up angiogram (155) or duplex ultrasound (55). There were 10 restenoses (4.7%), 1 of which was symptomatic and 2 of which showed mild compression of a Palmaz stent without marked stenosis. Primary and secondary 4-year patency rates were 96% and 99%, respectively. These results demonstrate acceptable mortality and morbidity rates related to carotid angioplasty and stenting. However, we found the risk of embolic stroke to be substantial. Cerebral protection may improve the results of carotid angioplasty and expand the indications for this procedure.

Carotid stenting with cerebral protection: first clinical experience using the PercuSurge GuardWire system

PURPOSE

To study the feasibility and safety of carotid angioplasty and stenting using a new cerebral protection device that temporarily occludes the distal internal carotid artery (ICA).

METHODS

Forty-eight high-risk patients (39 men, mean age 69.1 +/- 8 years, range 54 to 86) with 53 ICA stenoses underwent percutaneous angioplasty and stenting via the femoral approach under cerebral protection afforded by a 0.014-inch GuardWire balloon occlusion device. Mean stenosis was 82.1% +/- 9.65% (range 70 to 96) and mean lesion length was 16.0 +/- 7.5 mm (range 6 to 50). Thirty-three (62%) lesions were calcified, and 38 (72%) were ulcerated. Thirty-two (60%) of the lesions were asymptomatic. With the occlusion balloon inflated in the distal ICA, the lesion was dilated and stented. The area was cleaned by aspiration and flushed via an aspiration catheter advanced over the wire. Blood samples were collected from the external carotid artery (ECA) and analyzed to measure the size and number of particles collected. Computed tomography and neurological examinations were performed the day after the procedure.

RESULTS

Immediate technical success was achieved in all patients with the implantation of 38 Palmaz stents, 8 Expander stents, and 11 Wallstents. Carotid occlusion was well tolerated in all patients but 1 who had multiple, severe carotid lesions and poor collateralization. Mean cerebral flow occlusion time was 346 +/- 153 seconds during predilation and 303 +/- 143 seconds during stent placement. Total mean flow occlusion time was 542 +/- 243 seconds. One immediate neurological complication (transient amaurosis) occurred in a patient who had an anastomosis between the external carotid (EC) and ICA territories. Debris was removed in all patients with a mean 0.8-mm diameter catheter.

CONCLUSION

Cerebral protection with the GuardWire device is easy, safe, and effective in protecting the brain from cerebral embolism. Larger studies are warranted.