• Clinical Endoscopy
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• 제57권5호
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• pp.675-682
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• 2024

Background/Aims: Pancreatic cancer poses significant challenges due to its tendency for late-stage diagnosis and high mortality rates. Cryoablation, a technique used to treat various types of cancer, has shown potential in enhancing the prognosis of pancreatic cancer when combined with other therapies. However, its implementation is often limited by the need for lengthy procedures and specialized equipment. This study aims to develop a cryoablation needle optimized for endoscopic ultrasonography to simplify its application in treating pancreatic cancer. Methods: The study involved conducting cryoablation experiments on swine liver tissue. It utilized cryo-needles to evaluate the extent of cell death across various temperatures and durations of cryoablation. Results: The cryoablation system, which employed liquid carbon dioxide, achieved rapid cooling, reaching temperatures below -60 ℃ within 30 seconds and maintained the cryoablation process for 200 seconds. These conditions resulted in necrosis of the liver tissue. Notable cellular changes were observed up to 15 mm away from the cryoablation needle. Conclusions: This experimental study successfully demonstrated the efficacy of using a cryo-needle for cryoablation in swine liver tissue. Further trials involving pancreatic tissue are expected to verify its effectiveness, underscoring the importance of continued research to establish its role as a complementary therapy in pancreatic cancer treatment.

• Journal of Chest Surgery
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• 제47권4호
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• pp.367-372
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• 2014

Background: We compared the mid-term results of the Cox maze IV procedure using argon-based cryoablation with a procedure using $N_2O$-based cryoablation. Methods: From May 2006 to June 2012, 138 patients (mean age, $58.2{\pm}11.0$ years) underwent the Cox maze IV procedure. Eighty-five patients underwent the maze procedure using an $N_2O$-based cryoprobe (group N), and 53 patients underwent the maze procedure using an argon-based cryoprobe (group A). Bipolar radiofrequency ablation was concomitantly used in 131 patients. The presence of atrial fibrillation immediately, 6 months, 1 year, and 2 years after surgery was compared. Results: Early mortality occurred in 6 patients (4.3%). There were no differences in early mortality or postoperative complications between the two groups. Nineteen of 115 patients (16.5%) remained in atrial fibrillation at postoperative 12 months (14 of 80 patients (17.5%) in group N and 5 of 35 patients (14.3%) in group A, p=0.669). There were no differences in the number of patients who remained in atrial fibrillation at any of the time periods except in the immediate postoperative period. A multivariable analysis revealed that the energy source of cryoablation was not associated with the presence of atrial fibrillation at 1 year (p=0.862) and that a fine F wave (<0.1 mV) was the only risk factor predicting the presence of atrial fibrillation at 1 year (p<0.001, odds ratio=20.287). Conclusion: The Cox maze IV procedure using an argon-based cryoprobe was safe and effective compared with the maze procedure using an $N_2O$-based cryoprobe in terms of operative outcomes and the restoration of sinus rhythm for up to 2 years after surgery.

• Journal of Chest Surgery
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• 제35권1호
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• pp.48-51
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• 2002

폰탄수술 중 초기의 우심방-폐동맥 문합방식으로 시행한 환자의 장기추적에서 심방성 부정맥, 심방확장, 폐정맥폐쇄, 심실기능저하 등의 합병증이 발생된 경우 이에 대한 치료법으로 폰탄연결의 재교정이 권장된다. 심방성 빈맥을 동반한 폰탄연결 기능부전 환자에서 그에 대한 치료로서 혈류역학적 효율성이 월등한 것으로 알려진 심장외도관을 이용한 완전 체정맥-폐동맥연결과 부정맥 통로에 대한 냉동절제술의 병행이 선호된다. 본원에서는 삼첨판폐쇄증으로 우심방-폐동맥연결폰탄수술을 받은 후 장기추적 과정 중 이소성 심방빈맥,우심방매혈전, 폐정맥협착, 심실기능저하 등의 합병증이 발생된 환자 1례에서 냉동절제를 병행한 심장외도관 폰탄으로의 전환술을 경험하였기에 보고하는 바이다. 본 증례의 환자와 부모는 여호와의 증인 신자였으며 처치과정 중 수혈은 시행하지 않았다.

• Asian Pacific Journal of Cancer Prevention
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• 제15권10호
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• pp.4197-4201
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• 2014

Minor trauma to the uterine cervix is supposed to induce local immunity to prevent cervical lesions caused by human papillomavirus (HPV) infection. This study aimed to investigate the local cervical immunity in women with low grade squamous intraepithelial lesion (LSIL) and effects of abrasion after cryosurgery or Pap smear. One hundred women with LSIL and known results of HPV detection were recruited. HPV positive women were randomly divided according to abrasion into cryotherapy and Pap smear observation groups. Cervical tissues and cervico-vaginal lavage (CVL) were collected at 6 and 12 months after allocation. The levels of cytokines at first recruitment were compared with cytokine levels at 6 months after abrasions. The mRNA of IFN-${\gamma}$, TNF-${\alpha}$ and IL-10 in cervical tissues and these cytokines secreted in CVL were determined using real time PCR and ELISA, respectively. Anti-HPV16 IgG and IgA antibodies in CVL were assessed by western blotting. At first recruitment of women with LSIL (100 cases), IL-10 mRNA and cytokine in HPV positive group (60 cases) was significantly higher than negative group (40 cases). IFN-${\gamma}$ and TNF-${\alpha}$ mRNA level in both groups were comparable but their secretions in CVL were significantly increased in HPV negative group. After abrasion for 6 months in HPV-positive women, all mRNA and secreted cytokines were changed, but no significant difference was observed between cryotherapy and observation groups. When individuals were compared between first recruitment and after abrasion for 6 months, IFN-${\gamma}$ mRNA and anti-HPV16 L1 IgA antibodies were significantly increased in the cryotherapy group. The results suggest that modulation of local cervical immunities by abrasion might promote different effects in clearance of HPV-related cytological abnormalities.

• Journal of Chest Surgery
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• 제41권4호
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• pp.457-462
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• 2008

배경: 기관이나 기관분지부를 폐색시켜 호흡곤란을 유발하는 경우 기관 내경을 확보하기 위한 응급 시술이 필요하며 기관지 내시경을 이용한 레이저 소작술, 광역동치료 등의 치료가 사용된다. 냉동치료는 극저온으로 암을 얼려 암 조직의 괴사를 만들고 암을 제거하는 방법으로 본 연구에서 기관지내시경을 이용한 냉동수술의 임상적 유용성을 분석하였다. 대상 및 방법: 2005년 5월부터 2007년 5월까지 기관지내 종양으로 기관지 폐색을 일으킨 10명의 환자를 대상으로 분석하였다. 8명은 남자환자였고 평균연령은 $59.4{\pm}18.4$세였다. 양성종양이 3명, 악성종양이 7명이었고 폐색부위는 기관이 3명, 기관분지부가 3명, 기관지 4명이었다 시술은 굴곡형 기관지 내시경을 통하여 굴곡형 냉동수술기구를 넣어 기관지 폐색부위의 종양을 제거하였다. 냉동수술 1주 후, 1달 후에 각각 기관지내시경을 시행하여 시술의 성공률과 호흡곤란의 완화, 활동도의 호전, 시술의 합병증을 분석하였다. 결과: 10명의 환자 중 4명은 완전 관해되었고 6명은 불완전 관해를 보였다. 시술 후 합병증은 각혈(100%), 기침(5명) 등이 발생하였다. 각혈은 특별한 치료 없이 평균 4.9일($3{\sim}8$일)만에 호전되었다. 시술 후 모든 환자에서 호흡곤란의 완화와 활동도(performance scale)의 호전을 볼 수 있었다. 결론: 기관폐색은 말기암환자의 삶의 질 평가에서 중요한 부분을 차지하는 요소이다. 기관폐색의 재개통 방법 중 냉동수술은 간편하고 출혈이 적어 많은 양의 조직을 제거할 때 사용할 수 있는 안전한 방법으로 임상적용범위가 넓다. 본 임상경험에서, 기관 및 기관폐색 환자에서의 굴곡형 기관지 내시경을 이용한 냉동수술 방법은 효과적이며 안전한 방법이라 생각한다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제21권2호
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• pp.89-109
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• 1999

Vascular spasm which has been reported to occur in 25% of clinical cases continues to be a problem in microvascular surgery; When prolonged and not corrected, it can lead to low flow, thrombosis, and replant or free flap failure. Ischemia, intimal damage, acidosis and hypovolemia have been implicated as contributors to the vascular spasm. Although much work has been done on the etiology and prevention of vasospasm, a spasmolytic agent capable of firmly protecting against or reversing vasospasm has not been found. Therefore vascular freezing was introduced as a new safe method that immediately and permanently relieves the vasospasm and can be applied to microsurgical transfers. Cryosurgery can be defined as the deliberate destruction of diseased tissue or relief the vascular spasm in microvascular surgery by freezing in a controlled manner. 96 Sprague Dawley rats each weighing within 250g were used and divided into 2 group, experimental 1 and 2 group. In the experimental 1 group, right epigastric vessels (artery and vein) were freezed with a cryoprobe using $N_2O$ gas for 1 min. In the experimental 2 group, after freezing for 1 min, thawing for 30 secs and repeat freezing for 30 secs. Left side was chosen as control group in both group. We sacrified the experimental animals by 1 day, 3 days, 1 week, 2 weeks, 4 weeks & 5 months and observed the sequential change that occur during regeneration of epigastric vessels using a histologic, histomorphometric, immunohistochemical and SEM study after the vascular freezing. The results were as follows1. In epigastric arteries, internal diameters had statistically significant enlargement in 1 day, 3 days of Exp-1 group and 1 day, 3 days, 1 week & 2 weeks of Exp-2 group. Wall thickness had statistically significant thinning in 2 weeks of Exp-2 group. 2. In epigastric veins, internal diameters had enlargement of statistical significance in 1 day of Exp-1 and Exp-2 group. 3. The positive PCNA reactions in smooth muscle appeared in 1 week and increased until 2 weeks, decreased in 4 weeks. There was no statistical significance between Exp-1 and Exp-2 group. 4. The positive ${\alpha}$-SMA reaction in smooth muscles showed weak responses until 1 week and slowly increased in 2 weeks and showed almost control level in 4 weeks. 5. The positive S-100 reactions in the perivascular nerve bundles showed markedly decrease in 1 day, 3 days and increased after 1 week and showed almost control level in 4 weeks. Exp-1 group had stronger response than Exp-2 group. 6. In SEM, we observed defoliation of endothelial cell and flattening of vessel wall. Exp-2 group is more destroyed and healing was slower than Exp-1 group. To sum up, relief of vasospasm (vasodilatation) by freezing with cryoprobe was originated from the damage of smooth muscle layer and perivascular nerve bundle and the enlargement of internal diameter in vessels was similar to expeimental groups, but Exp-2 group had slower healing course and therefore vessel freezing in microsurgery can be clinically used, but repeat freezing time needs to be studied further.