Purpose: CT volumetrics are used to investigate energy applied to volume of ablated liver parenchyma in patients who underwent single antenna, single application (SA-SA) microwave ablation (MWA). Methods: Retrospective review was performed of all patients undergoing hepatic MWA. Two groups were identified: patients with hepatocellular carcinoma and cirrhosis and those with other malignancies without cirrhosis. Ablation volumes were calculated using open source imaging software. Results: 192 patients underwent 338 different tumor ablations. 16 patients with 23 lesions were included. Linear and non-linear regression models were calculated. Evaluation of the cirrhotic group with non-linear logarithmic regression yielded the best fit model of volume achieved to energy applied (MSE 145, R2=0.78). No predictive model was calculated in non-cirrhotics(MSE 615, R2=0.02). Conclusions: Volume ablated to energy applied ratio in cirrhotics yielded a strongly correlated predictive model; nocorrelation was found in non-cirrhotics.
In late years, microwave endometrial ablation (MEA) has been attracting attention as an effective and minimally invasive treatment alternative to hysterectomy. Microwave irradiation removes whole endometrium including its basal layer and reduces the amount of menstrual bleeding. We performed MEA for 103 patients with hypermenorrhea from August in 2007 to October in 2012. As a note, all patients had no hope of delivering. Among those patients, 72 cases were able to be enrolled for the evaluation. Then, the effectiveness of MEA for the excessive menstruation was evaluated. As a result, we have reached the conclusion that MEA is a new effective treatment with safety and good cost performance for excessive menstruation. MEA should be considered as a standard treatment for the conservative therapy-resistant excessive menstruation.
An estimated 6 million women in Japan suffer from excessive menstruation and the treatment of this disorder has been undergoing dramatic changes recently. In April 2012, microwave endometrial ablation (MEA) was approved for insurance coverage as a K863-3: a hysteroscopic endometrial ablation (17810 points). Since the introduction of MEA to Shimane University Hospital in August 2007, we have performed the procedure in 96 patients with excessive menstruation. Authors evaluate and report its safety, its effcacy, and its complication.