1
|
Calik J, Zawada T, Sauer N, Bove T. High Intensity Focused Ultrasound (20 MHz) and Cryotherapy as Therapeutic Options for Granuloma Annulare and Other Inflammatory Skin Conditions. Dermatol Ther (Heidelb) 2024; 14:1189-1210. [PMID: 38703308 PMCID: PMC11116313 DOI: 10.1007/s13555-024-01163-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Accepted: 04/08/2024] [Indexed: 05/06/2024] Open
Abstract
INTRODUCTION In dermatology, inflammatory skin conditions impose a substantial burden worldwide, with existing therapies showing limited efficacy and side effects. This report aims to compare a novel immunological activation induced by hyperthermic 20 MHz high intensity focused ultrasound (HIFU) with conventional cryotherapy. The bioeffects from the two methods are initially investigated by numerical models, and subsequently compared to clinical observations after treatment of a patient with the inflammatory disease granuloma annulare (GA). METHODS Clinical responses to moderate energy HIFU and cryotherapy were analysed using numerical models. HIFU-induced pressure and heat transfer were calculated, and a three-layer finite element model simulated temperature distribution and necrotic volume in the skin. Model output was compared to 22 lesions treated with HIFU and 10 with cryotherapy in a patient with GA. RESULTS Cryotherapy produced a necrotic volume of 138.5 mm3 at - 92.7 °C. HIFU at 0.3-0.6 J/exposure and focal depths of 0.8 or 1.3 mm generated necrotic volumes up to only 15.99 mm3 at temperatures of 68.3-81.2 °C. HIFU achieved full or partial resolution in all treated areas, confirming its hyperthermic immunological activation effect, while cryotherapy also resolved lesions but led to scarring and dyspigmentation. CONCLUSION Hyperthermic immunological activation of 20 MHz HIFU shows promise for treating inflammatory skin conditions as exemplified by GA. Numerical models demonstrate minimal skin necrosis compared to cryotherapy. Suggested optimal HIFU parameters are 1.3 mm focal depth, 0.4-0.5 J/exposure, 1 mm spacing, and 1 mm margin. Further studies on GA and other inflammatory diseases are recommended.
Collapse
Affiliation(s)
- Jacek Calik
- Old Town Clinic, Wszystkich Świętych 2a, 50-127, Wrocław, Poland
- Department of Clinical Oncology, Wroclaw Medical University, 50-556, Wrocław, Poland
| | - Tomasz Zawada
- TOOsonix A/S, Agern Allé 1, 2970, Hoersholm, Denmark.
| | - Natalia Sauer
- Old Town Clinic, Wszystkich Świętych 2a, 50-127, Wrocław, Poland
- Faculty of Pharmacy, Wroclaw Medical University, 50-556, Wrocław, Poland
| | - Torsten Bove
- TOOsonix A/S, Agern Allé 1, 2970, Hoersholm, Denmark
| |
Collapse
|
2
|
Calik J, Zawada T, Bove T, Dzięgiel P, Pogorzelska-Antkowiak A, Mackiewicz J, Woźniak B, Sauer N. Healing Process after High-Intensity Focused Ultrasound Treatment of Benign Skin Lesions: Dermoscopic Analysis and Treatment Guidelines. J Clin Med 2024; 13:931. [PMID: 38398246 PMCID: PMC10888560 DOI: 10.3390/jcm13040931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 01/27/2024] [Accepted: 02/03/2024] [Indexed: 02/25/2024] Open
Abstract
Background: High-Intensity Focused Ultrasound (HIFU) has emerged as a precise and non-invasive modality for tissue ablation and healing. This study presents a detailed dermoscopic analysis of skin healing post-High-Intensity Focused Ultrasound (HIFU) treatment, focusing on common benign skin lesions, such as seborrheic keratosis, sebaceous hyperplasia, vascular lesions, and sebaceous nevi. Methods: Prior to HIFU treatment, a comprehensive assessment was conducted, integrating ultrasound scanning and clinical evaluations. The TOOsonix System ONE-M was employed for HIFU treatments, with parameters tailored to each lesion type. Results: A common pattern observed across all lesions includes initial whitening post treatment, followed by scab formation and the development of a pink area with reparative vessels. This study, however, highlights distinct differences in fibrosis patterns and healing timelines across different lesion types. Each lesion type exhibited unique fibrosis patterns post treatment. Flatter variants of seborrheic keratosis healed within a month, displaying hypopigmentation and reparative vessels, alongside a distinct lattice fibrosis pattern in more verrucous forms, which took about two months to heal. Sebaceous hyperplasia, characterized by rapid healing within three weeks, demonstrated fibrosis with pink areas and perpendicular white lines, concluding with a slight depression. Vascular lesions varied in healing time based on depth, with superficial ones showing whitening and crust formation, while deeper lesions had vessel occlusion and size reduction accompanied by concentric fibrotic bands. Sebaceous nevi presented the longest healing duration of three months, characterized by amorphous white-gray structures, scab formation, and the emergence of pink areas with branching vessels, leading to clear skin with reduced white lines. Conclusions: in conclusion, this meticulous clinical evaluation highlights the unique healing characteristics and timelines for each skin lesion type treated with HIFU. These insights are invaluable for optimizing follow-up assessments, identifying potential complications, and refining treatment protocols. By providing detailed insights into the healing timelines and patterns for different types of lesions, patients can be better informed about their post-treatment journey.
Collapse
Affiliation(s)
- Jacek Calik
- Department of Clinical Oncology, Wroclaw Medical University, 50-556 Wrocław, Poland
- Old Town Clinic, 50-136 Wroclaw, Poland;
| | - Tomasz Zawada
- TOOsonix A/S, 2970 Hoersholm, Denmark; (T.Z.); (T.B.)
| | - Torsten Bove
- TOOsonix A/S, 2970 Hoersholm, Denmark; (T.Z.); (T.B.)
| | - Piotr Dzięgiel
- Division of Histology and Embryology, Department of Human Morphology and Embryology, Wroclaw Medical University, T. Chalubinskiego 6a, 50-368 Wroclaw, Poland;
- Department of Human Biology, Faculty of Physiotherapy, Wroclaw University of Health and Sport Sciences, 51-612 Wroclaw, Poland
| | | | - Jacek Mackiewicz
- Department of Medical and Experimental Oncology, Institute of Oncology, Poznan University of Medical Sciences, 61-701 Poznan, Poland;
| | | | - Natalia Sauer
- Old Town Clinic, 50-136 Wroclaw, Poland;
- Faculty of Pharmacy, Wroclaw Medical University, 50-556 Wroclaw, Poland
| |
Collapse
|
3
|
Zawada T, Bove T, Lou-Moller R, Ringgaard E. Head-to-Head Comparison of Acoustic Properties of Lead-Free and PZT-Based HIFU Transducers Operating at 12 MHz. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2024; 71:16-26. [PMID: 37028298 DOI: 10.1109/tuffc.2023.3256535] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
A direct comparison of performance and acoustic properties of high-intensity focused ultrasonic transducers utilizing lead-free (sodium bismuth titanate-NBT) and lead-based (lead zirconate titanate-PZT) piezoceramics is discussed. All transducers operate at 12 MHz at third harmonic frequency, having an outer diameter of 20 mm, a central hole of 5 mm in diameter, and a radius of curvature of 15 mm. The electroacoustic efficiency determined by a radiation force balance is evaluated in a range of input power levels up to 15 W. Schlieren tomography as well as hydrophone measurements are used for evaluation of the acoustic field distribution. It is found that the average electroacoustic efficiency of NBT-based transducers is approximately 40%, while it is around 80% in the PZT-based devices. NBT devices show significantly higher inhomogeneity of the acoustic field under schlieren tomography compared to PZT devices. From pressure measurements in the prefocal plane, it was found that the inhomogeneity could be attributed to depoling of significant areas of the NBT piezo-component during the fabrication process. In conclusion, PZT-based devices performed significantly better than those using lead-free material. However, the NBT devices show promise for this application and their electroacoustic efficiency as well as the uniformity of the acoustic field could be improved by employing a low-temperature fabrication process or repoling after processing.
Collapse
|
4
|
Noorbakhsh M, Kalantari Y, Ghasemi E, Shokri B, Mahmoudi H, Daneshpazhooh M, Etesami I, Khani M. Comparing the efficacy of plasma exeresis and cryotherapy for the treatment of seborrheic keratosis: A randomized controlled trial. Skin Res Technol 2023; 29:e13429. [PMID: 37632194 PMCID: PMC10374986 DOI: 10.1111/srt.13429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Accepted: 07/22/2023] [Indexed: 08/27/2023]
Abstract
BACKGROUND Seborrheic keratoses (SK) is a benign epithelial skin tumor and plasma exeresis is a new technique. AIMS To compare the efficacy and safety of plasma exeresis and cryotherapy for treating SK. METHODS This study is a randomized controlled trial (RCT). One side of each patient was randomly treated with plasma exeresis (peak-to-peak voltage of 3.44 kV and a frequency of 62.5 kHz) and the other side with cryotherapy. RESULTS Thirty-five males were enrolled. At week 3, 37.1 % (N = 13) of lesions treated by plasma exeresis were clear, which was higher than those treated by cryotherapy 17.1% (N = 6). However, this difference was not significant (p-value: 0.06). At week 6, 16 (57.1 %) out of 28 remaining lesions, treated by plasma exeresis were clear, which was significantly higher (p-value: 0.005) than those completely cleared by cryotherapy in 6 out of 29 remaining lesions (20.7%). The mean physician assessment scale score was significantly reduced in both groups in the second follow-up (plasma group first follow-up 0.91 ± 0.89 vs. second follow-up 0.5 ± 0.64 and p-value: 0.0031; cryo group first follow-up 1.4 ± 0.84 vs. second follow-up 1.1 ± 0.72 and p-value: 0.0002). Regarding side effects, no significant difference was seen (p = 0.438). The most common complications in the plasma and cryotherapy groups were erythema (10/19, 52.63%) and hypo pigmentation (5/13, 38.46%). CONCLUSIONS Both cryotherapy and plasma exeresis are effective. We observed a significantly higher cleared lesions treated with plasma exeresis in 6 weeks and after two sessions.
Collapse
Affiliation(s)
- Maryam Noorbakhsh
- Department of DermatologyRazi HospitalTehran University of Medical SciencesTehranIran
| | - Yasamin Kalantari
- Department of DermatologyRazi HospitalTehran University of Medical SciencesTehranIran
| | - Erfan Ghasemi
- Laser and Plasma Research InstituteShahid Beheshti UniversityTehranIran
| | - Babak Shokri
- Laser and Plasma Research InstituteShahid Beheshti UniversityTehranIran
- Physics Department of Shahid Beheshti UniversityTehranIran
| | - Hamidreza Mahmoudi
- Department of DermatologyRazi HospitalTehran University of Medical SciencesTehranIran
| | - Maryam Daneshpazhooh
- Department of DermatologyRazi HospitalTehran University of Medical SciencesTehranIran
| | - Ifa Etesami
- Department of DermatologyRazi HospitalTehran University of Medical SciencesTehranIran
| | | |
Collapse
|
5
|
Wozniak B, Bove T, Zawada T, Calik J. Treatment of Cutaneous Neurofibromas in Patients with Neurofibromatosis Type 1. Case Rep Dermatol 2023; 15:194-201. [PMID: 37899948 PMCID: PMC10601743 DOI: 10.1159/000534270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 09/19/2023] [Indexed: 10/31/2023] Open
Abstract
Neurofibromatosis type 1 is a genetic disorder impacting approximately 2.5 million people worldwide, often leading to development of numerous benign yet disfiguring cutaneous neurofibromas (cNF). Removal of cNF is limited to excision or laser ablation with common post-operation complications and scarring. The current case explores a new approach to removal or reduction of cNF by a minimally invasive and pain-reduced treatment modality. A 40-year-old female patient with numerous cNF across her body underwent a single treatment using a 20 MHz dermatologically focused ultrasound device on seven selected cNF on the upper back. Each cNF was treated in a single session of 20-60 s without anesthesia due to manageable pain. Only one minimal adverse reaction in the form of dyspigmentation in a single treated tumor was noted from treatment or during the healing of a thin scab that formed on each cNF a few days after treatment. At the 12-month follow-up, four out of seven treated cNF showed full remission, two showed partial or significant reduction in tumor volume, while two did not respond to treatment. The reason for the variability is not fully understood, but speculations include difference in tissue content, e.g., due to tumor age. The method is concluded to be a promising candidate for a new safe and minimally invasive treatment that can potentially be used for single-session removal/reduction of a large number of cNF. Further research should focus on refining treatment parameters and strategies to enhance response predictability.
Collapse
Affiliation(s)
- Bartosz Wozniak
- Department of Dermatology and Venereology, Regional Specialist Hospital, Wroclaw, Poland
- Old Town Clinic, Wroclaw, Poland
| | | | | | - Jacek Calik
- Old Town Clinic, Wroclaw, Poland
- Department of Oncology, Academic Hospital Wroclaw, Wroclaw, Poland
| |
Collapse
|
6
|
Zawada T, Bove T, Astafiev K, Ringgaard E, Lou-Moeller R. Lead-Free HIFU Transducers. ULTRASOUND IN MEDICINE & BIOLOGY 2022; 48:2530-2543. [PMID: 36180313 DOI: 10.1016/j.ultrasmedbio.2022.08.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 07/25/2022] [Accepted: 08/10/2022] [Indexed: 06/16/2023]
Abstract
High-intensity focused ultrasound transducers operating at 4 MHz based on lead-free piezoceramics from the sodium bismuth titanate (NBT) family are described. First, the piezoelectric material (Pz12X) is evaluated from the standpoint of transducer design and its important characteristics, including temperature dependance of several parameters such as dielectric and mechanical coefficients. Then, the performance of six transducers of the same design is evaluated in terms of electro-acoustic efficiency and its dependency on the operating acoustic power level up to 30 W. Overall, the initial electro-acoustic efficiency of three independent transducers is approximately 50% at low acoustic power levels and slightly drops down to 42% as the input electric power reaches 10 W. This process is stable and fully reversible. Moreover, the stability of electro-acoustic efficiency over extended power burst cycling is studied using another two transducers up to 95 × 103 power bursts of 250-ms duration and acoustic power of 10 W. This protocol is beyond the typical clinical use of similar devices in practice. No significant changes in electro-acoustic performance are noted. Additionally, the input electric power and the output acoustic power, together with the temperature of the piezoelectric component, are evaluated simultaneously over the period of one power burst. It is found that the maximum operating temperature over a high-input electric power burst of 600 J is below 60°C, which defines the operational limit for such devices, as the de-poling temperature of the lead-free material is around 85°C. It is found that the lead-free material from the NBT family is also a promising alternative to lead-based PZT-type materials in high-power therapeutic ultrasound.
Collapse
|