Facial Reconstruction Using Porous High-Density Polyethylene (Medpor): Long-Term Results

2012 ◽  
Vol 36 (4) ◽  
pp. 917-927 ◽  
Author(s):  
Igor Niechajev
Keyword(s):  
High Density Polyethylene ◽  
High Density ◽  
Facial Reconstruction ◽  
Long Term Results

P1377Substrate-based ablation in patients with frequent appropriate ICD therapy and dilated cardiomyopathy: long-term experience with high-density mapping

EP Europace ◽  
2020 ◽  
Vol 22 (Supplement_1) ◽  
Author(s):  
M M O Oliveira ◽  
P S C Cunha ◽  
B V Valente ◽  
G Portugal ◽  
A Lousinha ◽  
...  
Keyword(s):  
Left Ventricular ◽  
High Density ◽  
Border Zone ◽  
Long Term Results ◽  
Icd Therapy ◽  
Electroanatomic Mapping System ◽  
Density Mapping ◽  
Substrate Modification ◽  
Lv Dysfunction

Abstract Recurrent ventricular tachydisrhythmias (VT) episodes have a negative impact in the outcome of patients (P) already with an implantable cardioverter-defibrillator (ICD). Elimination of arrhythmic reentry circuits represents a difficult challenge, mainly due to the induction of intolerable VTs, with multiple ECG morphologies, requiring rapid interruption. Substrate guided ablation has been used as a promising approach strategy to treat recurrent VTs. Aim: to assess long-term results of a VT substrate-based ablation using high-density mapping in P with an ICD, severe left ventricular (LV)  dysfunction and recurrent appropriate ICD therapy. Methods: 16P (12 men, non-ischemic cardiomyopathy 67%, 55 ± 13 years, LV ejection fraction 32 ± 6%) and recurrent appropriate shocks despite antiarrhythmic drug therapy and optimal heart failure medication. All P underwent a protocol of ventricular programmed stimulation (600 ms/S3) to obtain baseline VT documentation. A sinus rhythm (SR) voltage map was created using a 3D electroanatomic mapping system (CARTO) with a high-density mapping catheter (PentaRay) to delineate areas of scarred myocardium (ventricular bipolar voltage ≤0,5 mV – dense scar; 0,5-1,5 mV – border zone; ≥1,5 mV – healthy tissue) and provide high-resolution electrophysiological mapping. The substrate modification included catheter elimination of local abnormal ventricular activities (LAVA) - fractionated, splited, low-amplitude/long-lasting, late potentials, pre-systolic potentials - and linear ablation to obtain scars homogenization and scar dechanneling. Pace-mapping techniques were used when capture was possible. LV approach was retrograde in 6 cases, transeptal in 4 and endo-epicardial in 2 cases. In 2P the ablation was performed in the right ventricle. Results: VTs were induced and interrupted with bursts or external DC shocks. LAVA were identified and ablated in all P. Eleven P underwent modification of scar areas. The mean duration of the procedure was 153 mn (103-218 mn), with radiofrequency ranging from 18 to 60 mn (mean 33 min), and a mean fluoroscopy time of 16 mn. Non-inducibility was achieved in 75% of the cases. There was 1 pericardial tamponade drained successfully. During a follow-up of 48 ± 18 months, 75% had no VT recurrences, 2P underwent redo ablation, 1P died from stroke. Conclusion: Catheter ablation of VT based on substrate modification guided by high-density mapping is feasible and safe in P with LV dysfunction. This approach may be of clinical relevance, with potential benefits in reducing VT burden.

Wear of the high-density polyethylene socket in total hip arthroplasty and its role in endosteal cavitation

1997 ◽  
Vol 211 (1) ◽  
pp. 109-118 ◽  
Author(s):  
B M Wroblewski
Keyword(s):  
Hip Replacement ◽  
High Density Polyethylene ◽  
High Density ◽  
Wear Particles ◽  
Total Hip ◽  
Weakest Link ◽  
Ultimate Cause ◽  
Cause Of Failure ◽  
Secondary Healing

High-density polyethylene (HDP) has been used in clinical practice in total hip replacement since its introduction by Charnley in November 1962. Fears are being expressed that this may be the weakest link and the ultimate cause of failure of the arthroplasty. Long-term clinical experience suggests that loosening may be the primary cause while the presence of HDP wear particles is secondary. Healing of endosteal cavities can take place in the presence of HDP wear particles.

Long-term water uptake behavior of lignocellulosic-high density polyethylene composites

2006 ◽  
Vol 102 (4) ◽  
pp. 3907-3911 ◽  
Author(s):  
Saeed Kazemi Najafi ◽  
Mehdi Tajvidi ◽  
Majid Chaharmahli
Keyword(s):  
Water Uptake ◽  
High Density Polyethylene ◽  
High Density ◽  
Polyethylene Composites
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