Experiences with Ultracinch and Ultrawand HIFU Techniques for Ablation Therapy M. Dalrymple-Hay FRCS FECTS PhD Consultant Cardiac Surgeon Declared Interests.

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Presentation transcript:

Experiences with Ultracinch and Ultrawand HIFU Techniques for Ablation Therapy M. Dalrymple-Hay FRCS FECTS PhD Consultant Cardiac Surgeon Declared Interests - Honoraria St. Jude Medical and Maquet

Experiences with New Techniques for Ablation Therapy Ultracinch LP and Wand Lower Profile Gradual dilation system Snares encased in dilation system

Experiences with New Techniques for Ablation Therapy HIFU Variable wattage and frequency through the ablation cycle Focus:DeepIntermediate Surface Mode: Pulse Pulse Continuous Frequency: Low (~3.8 MHz) High (~6.4 MHz) High (~6.4 MHz) Pulse Power: a 130 W (acoustic)60 W (acoustic) 15 W (acoustic) Duration: 1200 ms 2000 ms 40 s Average Power: b 3 W 3 W 15 W Total Energy: 5 pulses per cell 4 pulses per cell

Transmurality

Experiences with New Techniques for Ablation Therapy Epicardial Off Pump Application –Change closed heart to open heart procedure –Perform additional myocardial incisions Sanders P et al. J Cardio Electrop 2006;17: Sahadevan et al. Circulation 2004;110:3293-9

12 week OPD - ECG Sinus rhythm discontinue AAD AF – Cardioversion 6 months with recent 24 hour tape (of AAD) No AF 24 Hr. tape – TTE - Mitral transport A wave velocity greater than 10 cm/s Experiences with New Techniques for Ablation Therapy Protocol

28 July 08 – 29 Oct patients –11 concomitant indication –6 lone indication 15 (88%) male, 2 female Mean age 66.7 yrs Mean Euroscore 4.88 (2-9) Experiences with New Techniques for Ablation Therapy Patient Demographics

Lone AF 6 Concomitant ablation 11 –MVRepairn = 1 –CABGn = 7 (2 pt’s CABG x 1) –AVRn = 1 –AVR + CABGn = 1 –AVR + MVRepair n = 1 Experiences with New Techniques for Ablation Therapy

Lone AF 6 –LA size 4.5cm (range ) –Duration AF – mean 5.7yrs (range 3-11yrs) –EF Poor LV (<30%) – 2 Mod LV (30-50%) – 1 Good LV (>50%) - 3 Concomitant ablation 11 –Mitral valve surgery LA 5.7 cm and EF 55% –CABG LA > 5cm – one patient. EF mean 42.2% (26-57%) –Aortic valve surgery LA > 5cm – one patient. EF mean 46.2% (42-58%) Experiences with New Techniques for Ablation Therapy Characteristics

Experiences with New Techniques for Ablation Therapy Results Freedom from AF (Lone) – 5/6 (87%) – Other patient flutter – AF 5.5yrs, LA 5.4cm 2 required DC cardioversion at three months Freedom from AF (Concomitant) – 9/11 (81%) – One flutter (CABG) (4yrs LA 5.1cm), one AF (AVR + CABG) (11yrs LA 4.9cm)

Experiences with New Techniques for Ablation Therapy Conclusion Short term results Restoration SR majority patients Easy and safe to use Sustained LA function following ablation