BACKGROUND/AIMS: The purpose of this study was to assess the value of acoustic radiation force impulse (ARFI) for predicting the extent of radiofrequency ablation (RFA) in hepatocellular carcinoma (HCC) by correlating the elasticity of HCC and peritumoral parenchyma (as measured by ARFI) with the extent of ablation determined by computed tomography (CT). METHODS: From September 2009 to June 2011, 158 patients underwent RFA ablation for HCC (single, < or =3 cm). We evaluated the data of a total of 38 prospectively enrolled patients who underwent both ARFI imaging and contrast-enhanced CT after one session of 12 minutes of RFA without a change in needle position. The ARFI imaging indices, including the mean shear wave velocity (SWV) of HCC, mean SWV of the peritumoral parenchyma and tumor size, were evaluated to determine the statistical correlation with RFA extent after one session of 12 minutes of RFA. RESULTS: A stiffer liver parenchyma in patients with cirrhosis results in a smaller ablation zone. CONCLUSIONS: SWV of ARFI in liver parenchyma was well correlated with RFA extent. After evaluating the correlation between ARFI and RFA extent, we suggest that the SWV in liver parenchyma might be a non-invasive supplementary tool for predicting the extent of RFA.
Acoustics ; Carcinoma, Hepatocellular ; Elasticity ; Elasticity Imaging Techniques ; Fibrosis ; Humans ; Liver ; Needles ; Prospective Studies

OBJECTIVE: This study was conducted to investigate satisfaction surveys of the emergency medical system in Korea administered to both members of the Korean Society of Emergency Medicine and patients and their guardians. METHODS: The joint survey was conducted by the Korea Scientist Journalists Association and the Public Affairs Committee of the Korean Society of Emergency Medicine. Questionnaires administered to each group included questions about the general environment, safety, and overcrowding. Satisfaction of medical staffs and awareness of cardiopulmonary resuscitation were only included in the patient questionnaire, while public health was only surveyed in the member questionnaire. The satisfaction was evaluated on a 5-point scale. RESULTS: Patient questionnaires were answered by 20 of 413 national emergency medical centers, and about 4.3% of the medical institutions participated in the questionnaire. A total of 704 reply sheets were returned by patients. Member questionnaires were answered by 280 of the 1,108 members (25%). Among patients, the lowest satisfaction was the item of “medical expenses,” followed by “waiting time”. Among providers, the lowest satisfaction was “appropriateness of medical staff”, while the highest complaint was “overcrowding.” CONCLUSION: Emergency care users had the lowest satisfaction with “medical expenses,” while members had the lowest satisfaction with “lack of manpower” and were most dissatisfied with “violence” and “overcrowding.”
Cardiopulmonary Resuscitation ; Emergencies* ; Emergency Medical Services ; Emergency Medicine* ; Health Care Surveys ; Humans ; Job Satisfaction ; Joints* ; Korea* ; Medical Staff ; Patient Satisfaction ; Public Health