Objective:To evaluate the safety and efficacy of dosing transdermal fentanyl patch by patient-controlled intravenous anal-gesia (PCIA) with fentanyl to treat opioid-naive patients suffering from cancer-related pain. Methods:In this open non-controlled trial, 30 patients with moderate to severe cancer pain were enrolled in the study. Titration conditions, pain score (NRS), and pain of life im-pact scores were assessed and recorded during four periods of treatment, as follows:before fentanyl-PCIA;during fentanyl-PCIA treat-ment;during Duragesic with fentanyl-PCIA treatment;and during Duragesic treatment. Adverse reactions were assessed and recorded during the two periods of treatment (the period before fentanyl-PCIA and the period after fentanyl-PCIA). Results:A total of 20 cases of titration were a success, whereas 10 cases failed. The general pain score, the most serious pain score, activity pain score, resting pain score, and the pain of life impact scores were all significantly reduced during fentanyl-PCIA treatment, during Duragesic with fen-tanyl-PCIA treatment, and during Duragesic treatment compared with the period before fentanyl-PCIA treatment (P<0.05). Nausea was the only adverse reaction that occurred during treatment. Obvious muscle rigidity, loss of consciousness, cough, respiratory depres-sion, and bradycardia were not observed. Conclusion:Dose titration of transdermal fentanyl patch with fentanyl administrated by PCIA for opioid-naive patients provides an effective and convenient method for pain relief treatment.

Volatility can influence the lifetime of particles in the atmosphere, and provide useful information on the formation of secondary aerosol. The previous studies generally utilized thermodenuder ( TD ) to investigate the volatility behavior of particles. Using TD, semivolatile species are vaporized at different temperature, and the vaporized gas is adsorpted by activated charcoal. However, carbon might be emitted from activated charcoal under high temperature or activated charcoal ageing. In this study, a new method was developed for the measurement of particle volatility by coupling a thermodiluter system to an online single particle aerosol mass spectrometer ( SPAMS) . Aerosol particles were passed into two different channels, and then analyzed by SPAMS. Through Channel 1, aerosol particles were heated to different temperature by heating tube, then non-volatile particles and volatile gas entered into the diluter. After diluting and cooling by diluent air, the non-volatile particles were analyzed by SPAMS. Through Channel 2, aerosol particles were analyzed directly by SPAMS without the heating process. Particle volatility was obtained by comparing the information ( particle size, particle number and mass spectrum ) of particles through Channels 1 and 2. Laboratory tests showed that the diluter could avoid the re-condensation of volatiles to the particles. This developed method was applied in the real time measurement of individual particle volatility in the spring of Guangzhou. The results showed that these particles were primarily comprised of highly volatile and moderate volatile species.