Magnetite (Fe3O4) nanoparticles with different magnetic properties were prepared by coprecipitation of Fe3+ and Fe2+ with aqueous NaOH solution. The inductive heat properties of Fe3O4 nanoparticles in an alternating c...Magnetite (Fe3O4) nanoparticles with different magnetic properties were prepared by coprecipitation of Fe3+ and Fe2+ with aqueous NaOH solution. The inductive heat properties of Fe3O4 nanoparticles in an alternating current (AC) magnetic field were investigated for local hyperthermia. The maximum saturation magnetization Ms of Fe3O4 nanoparticles is 65.53 emu·g-1 under the optimum conditions of Fe3+: Fe2+ molar ratio at 1.8:1. The Ms of Fe3O4 nanoparticles decreased as the Fe3+/Fe2+ molar ratio increased. But the coercivity Hc increases with the increasing of Fe3+/Fe2+ molar ratio. Exposed in the AC magnetic field for 29 min, the temperatures of physiological saline suspension containing Fe3O4 nanoparticles were 42-97.5 ℃. The inductive heat property of Fe3O4 nanoparticles in AC magnetic field decreases as Hc increases, but increases with the increasing of Ms. The Fe3O4 nanoparticles would be useful as good thermoseeds for localized hyperthermia treatment of cancers.展开更多
BACKGROUND Undifferentiated pleomorphic sarcoma(UPS)is a type of soft tissue sarcoma,the histologic origin and differentiation direction of which are still unclear.There are few treatment options for UPS other than su...BACKGROUND Undifferentiated pleomorphic sarcoma(UPS)is a type of soft tissue sarcoma,the histologic origin and differentiation direction of which are still unclear.There are few treatment options for UPS other than surgery.Herein we describe a patient who had multiple recurrences of UPS postoperatively,but R0 resection was achieved by local hyperthermia combined with chemotherapy,thus providing a new treatment approach for similar situations.CASE SUMMARY A 65-year-old man sought evaluation from a physician for a mass on his right back.After surgery,the pathologic diagnosis was fibrosarcoma.During the follow-up evaluations until 2021,the patient had four relapses of varying degrees.Postoperative pathology confirmed the recurrence of UPS on the right back.In March 2021,he underwent local hyperthermia combined with two cycles of chemotherapy for recurring lesions.After magnetic resonance imaging reexamination and preoperative examination,the patient chose surgery again.During the operation,the tumors were easy to excise,the amount of bleeding decreased significantly,and the pathologic evaluation confirmed that one of the specimens was an R0 excision.CONCLUSION Local hyperthermia combined with chemotherapy enables R0 resection to be achieved in patients with advanced UPS recurrence.展开更多
Average size of hematite and magnetite micro and nanopowders and polydispersity index, zeta potential and distribution of particles were studied. Analysis showed that average size of the obtained particles for magneti...Average size of hematite and magnetite micro and nanopowders and polydispersity index, zeta potential and distribution of particles were studied. Analysis showed that average size of the obtained particles for magnetite is 740.9 nm, for hematite particles 30 - 35 nm. Alternate current feed source was created for hyperthermia. Proceeding from the requirements of the objectives, the U type MnZn material magneto conductors were selected, in which 10.0 and 8.0 mm width gaps were cut and glass test tubes with magnetite or hematite suspensions were placed in them. Series of experiments at various field intensity and frequencies showed that for efficient magnetic hyperthermia therapy more powerful device was needed with frequency of up to 10 Mega Hertz to achieve the temperature 43°C - 45°C necessary for full activation of Neel and Brown mechanisms in particles. At the next stage, on the basis of experimental material the anticancer mono-therapeutic effect of hyperthermia and its adjuvant action in poly chemotherapeutic treatment was presented by the use of a device created by us “Lezi”. As a result of the experiment it was shown that in all animals (outbred albino mice, 3 months old) inhibition of cancer growth was fixed and intratumoral necrosis was developed, while after 7 and 10 sessions tumors were ulcerated, which refers to positive effect of the experiment (Conclusion of Pathologicanatomical Laboratory “PATGEO”, Tbilisi, Georgia ).展开更多
The mechanisms of epidural-associated fever remain incompletely understood [1-3]. We propose that action of local anesthetic on TPRV1. The transient receptor potential cation channel subfamily V member 1 (TRPV1), also...The mechanisms of epidural-associated fever remain incompletely understood [1-3]. We propose that action of local anesthetic on TPRV1. The transient receptor potential cation channel subfamily V member 1 (TRPV1), also known as the capsaicin receptor and the vanilloid receptor can explain this effect and explain mechanism of burning sensation on local anesthetic injected subcutaneously or intramuscular. Role of TRPV1 receptor was not discussed previously in Obstetric Anesthesia literature. Based on available data, we propose that Local Anesthetics work as agonist/antagonist on TPRV1 receptors. Antagonist action may cause hyperthermia through modifying thermoregulation [4], agonist action may cause hyperthermia thru release of IL-6 and other mediators of inflammation [5-10]. Agonist action may explain burning sensation on injection of Local Anesthetics. Burning sensation can be diminished by increasing pH of Local Anesthetic solution, because vanillin receptors are stimulated by acidification through lower pH [11,12].展开更多
Nanotechnology applications, which aid radiotherapy and chemotherapy, have revolutionized diagnosis, treatment planning, imaging, and medical machinery. The ability of nanoparticles to kill or freeze cancer cells by r...Nanotechnology applications, which aid radiotherapy and chemotherapy, have revolutionized diagnosis, treatment planning, imaging, and medical machinery. The ability of nanoparticles to kill or freeze cancer cells by raising heat locally is a prominent application of nanoparticles. This paper will review the research on clinical applications of hyperthermia using nanoparticles stimulated by an alternating magnetic field and electromagnetic waves such as microwave and laser, as well as the foundation of the theoretical model used in bio-thermal applications.展开更多
文摘Magnetite (Fe3O4) nanoparticles with different magnetic properties were prepared by coprecipitation of Fe3+ and Fe2+ with aqueous NaOH solution. The inductive heat properties of Fe3O4 nanoparticles in an alternating current (AC) magnetic field were investigated for local hyperthermia. The maximum saturation magnetization Ms of Fe3O4 nanoparticles is 65.53 emu·g-1 under the optimum conditions of Fe3+: Fe2+ molar ratio at 1.8:1. The Ms of Fe3O4 nanoparticles decreased as the Fe3+/Fe2+ molar ratio increased. But the coercivity Hc increases with the increasing of Fe3+/Fe2+ molar ratio. Exposed in the AC magnetic field for 29 min, the temperatures of physiological saline suspension containing Fe3O4 nanoparticles were 42-97.5 ℃. The inductive heat property of Fe3O4 nanoparticles in AC magnetic field decreases as Hc increases, but increases with the increasing of Ms. The Fe3O4 nanoparticles would be useful as good thermoseeds for localized hyperthermia treatment of cancers.
文摘BACKGROUND Undifferentiated pleomorphic sarcoma(UPS)is a type of soft tissue sarcoma,the histologic origin and differentiation direction of which are still unclear.There are few treatment options for UPS other than surgery.Herein we describe a patient who had multiple recurrences of UPS postoperatively,but R0 resection was achieved by local hyperthermia combined with chemotherapy,thus providing a new treatment approach for similar situations.CASE SUMMARY A 65-year-old man sought evaluation from a physician for a mass on his right back.After surgery,the pathologic diagnosis was fibrosarcoma.During the follow-up evaluations until 2021,the patient had four relapses of varying degrees.Postoperative pathology confirmed the recurrence of UPS on the right back.In March 2021,he underwent local hyperthermia combined with two cycles of chemotherapy for recurring lesions.After magnetic resonance imaging reexamination and preoperative examination,the patient chose surgery again.During the operation,the tumors were easy to excise,the amount of bleeding decreased significantly,and the pathologic evaluation confirmed that one of the specimens was an R0 excision.CONCLUSION Local hyperthermia combined with chemotherapy enables R0 resection to be achieved in patients with advanced UPS recurrence.
文摘Average size of hematite and magnetite micro and nanopowders and polydispersity index, zeta potential and distribution of particles were studied. Analysis showed that average size of the obtained particles for magnetite is 740.9 nm, for hematite particles 30 - 35 nm. Alternate current feed source was created for hyperthermia. Proceeding from the requirements of the objectives, the U type MnZn material magneto conductors were selected, in which 10.0 and 8.0 mm width gaps were cut and glass test tubes with magnetite or hematite suspensions were placed in them. Series of experiments at various field intensity and frequencies showed that for efficient magnetic hyperthermia therapy more powerful device was needed with frequency of up to 10 Mega Hertz to achieve the temperature 43°C - 45°C necessary for full activation of Neel and Brown mechanisms in particles. At the next stage, on the basis of experimental material the anticancer mono-therapeutic effect of hyperthermia and its adjuvant action in poly chemotherapeutic treatment was presented by the use of a device created by us “Lezi”. As a result of the experiment it was shown that in all animals (outbred albino mice, 3 months old) inhibition of cancer growth was fixed and intratumoral necrosis was developed, while after 7 and 10 sessions tumors were ulcerated, which refers to positive effect of the experiment (Conclusion of Pathologicanatomical Laboratory “PATGEO”, Tbilisi, Georgia ).
文摘The mechanisms of epidural-associated fever remain incompletely understood [1-3]. We propose that action of local anesthetic on TPRV1. The transient receptor potential cation channel subfamily V member 1 (TRPV1), also known as the capsaicin receptor and the vanilloid receptor can explain this effect and explain mechanism of burning sensation on local anesthetic injected subcutaneously or intramuscular. Role of TRPV1 receptor was not discussed previously in Obstetric Anesthesia literature. Based on available data, we propose that Local Anesthetics work as agonist/antagonist on TPRV1 receptors. Antagonist action may cause hyperthermia through modifying thermoregulation [4], agonist action may cause hyperthermia thru release of IL-6 and other mediators of inflammation [5-10]. Agonist action may explain burning sensation on injection of Local Anesthetics. Burning sensation can be diminished by increasing pH of Local Anesthetic solution, because vanillin receptors are stimulated by acidification through lower pH [11,12].
文摘Nanotechnology applications, which aid radiotherapy and chemotherapy, have revolutionized diagnosis, treatment planning, imaging, and medical machinery. The ability of nanoparticles to kill or freeze cancer cells by raising heat locally is a prominent application of nanoparticles. This paper will review the research on clinical applications of hyperthermia using nanoparticles stimulated by an alternating magnetic field and electromagnetic waves such as microwave and laser, as well as the foundation of the theoretical model used in bio-thermal applications.
