Search

Radiofrequency ablation (RFA) has become an accepted alternative for treating intrathoracic malignancies; however, the incidence and characteristics of peri‐ and postprocedural complications are not well described. The purpose of the study was to assess the safety and technical feasibility of percutaneous RFA in unresectable intrathoracic malignancies.Percutaneous RFA was performed in patients with intrathoracic malignancies between June 2001 and December 2004. In total, 366 tumors were treated in 137 patients in 211 sessions. All patients were nonsurgical candidates or had refused surgery. Three hundred and thirty‐six lesions were subjected to RFA for the treatment of metastases and 30 lesions for primary lung carcinoma.Although no procedural mortality occurred, 2 patients died during the course of the study because of intractable pneumothorax and massive hemoptysis (0.9%). The overall major complication rate was 17.1% (pneumothoraces requiring tube drainage in 25, pleuritis in 6, pleural effusion requiring tube drainage in 4, lung abscess in 1, and intrapulmonary hemorrhage with hemothorax in 1). Minor complications included pneumothoraces not requiring tube drainage in 108 sessions, pleural effusion without drainage in 34, hemosputum in 9, nausea and/or vomiting in 3, subcutaneous emphysema in 3, cough in 2, skin burn in 2, atelectasis in 1, and subileus in 1. High fever and/or chest pain were seen in 33.8% and 39.3% of patients, respectively.With over 200 procedures, RFA appears to be a safe and minimally invasive option with negligible mortality and little morbidity in selected patients with unresectable intrathoracic malignancies. Cancer 2007. © 2007 American Cancer Society. [ABSTRACT FROM AUTHOR]

We fabricated three types of high luminous efficacy white light emitting diodes (LEDs). The first was a white LED with a high luminous efficacy (eL) of 249 lm W[?]1 and a high luminous flux (phv) of 14.4 lm at a forward-bias current of 20 mA. This eL was approximately triple that of a tri-phosphor fluorescent lamp (90 lm W[?]1). The blue LED used as the excitation source in this white LED had a high output power (phe) of 47.1 mW and a high external quantum efficiency (eex) of 84.3%. The second was a high-power white LED, fabricated from the above high-power blue LED, and had a high phe of 756 mW at 350 mA. phv and eL of the high-power white LED were 203 lm and 183 lm W[?]1 at 350 mA, respectively. The third was a high-power white LED fabricated from four high-power blue LED dies. phv and eL of the high-power white LED were 1913 lm and 135 lm W[?]1 at 1 A, respectively. The white LED had a higher flux than a 20 W-class fluorescent lamp and 1.5 times the luminous efficacy of a tri-phosphor fluorescent lamp (90 lm W[?]1). [ABSTRACT FROM AUTHOR]