Clinical and experimental applications of chest ultrasound in respiratory medicine: early diagnosis of pleural and pulmonary diseases

Lung ultrasound use is increasing in respiratory medicine thanks to its development in the latest years. Actually it allows to study diseases of the chest wall (traumas, infections, neoplasms), diaphragm (paralysis, ipokinesis), pleura (effusions, pneumothorax, thickenings, neoplasms) and lung parenchyma (consolidations, interstitial syndromes, peripheral lesions). One of the most useful application of chest ultrasound is the evaluation of effusions. However, no standardized approach for ultrasound-guided thoracenthesis is available. Our study showed that our usual ultrasonographic landmark (“V-point”) could be a standard site to perform thoracenthesis: in 45 thoracenthesis no pneumothorax occurred, drainage was always successful at first attempt. Values of maximum thickness at V-point and drained fluid volume showed a significative correlation. Proteins concentration of ultrasound patterns of effusions (anechoic, ipoechoic, moving echoic spots, dense moving spots, hyperechoic) were compared to those of the macroscopic features of fluids showing connection between light-yellow fluid and echoic moving spots pattern and between ipoechoic/dense moving spots and cloudy-yellow/serum-haematic fluids. These observations suggest that ultrasound could predict chemical-physical features of effusions. Lung ultrasound provides useful information about many disease of the lung, but actually there is not useful in obstructive bronchial diseases. Analysing diaphragmatic kinetics using M-mode through transhepatic scan we described a similarity between diaphragm excursion during an expiratory forced maneuver and the volume/time curve of spirometry. This allowed us to identify the M-mode Index of Obstruction (MIO), an ultrasound-analogue of FEV1/VC. We observed MIO values of normal subjects (9) and obstructed patients (9) comparing the two groups. FEV1/VC and MIO showed a significant correlation suggesting that MIO may be affected by airways obstruction; MIO values were significatively different between normal and obstructed so that it could identify an obstructive syndrome. The data show that it is possible to suspect the presence of obstructive syndrome of the airways using ultrasonography of the diaphragm

Completely dielectric E-field sensor based on a Lithium Niobate MZI

We report an IO electric field sensor based on a particular cofiguration of Mach-Zehnder interferometer. The device, fabricated on a Lithium Niobate substrate, is totally dielectric, without any presence of metallic electrodes. The Mach-Zehnder was achieved through soft proton exchange and poling technologies. A modulation depth of 92% and an half wave voltage of 107.8 V were measured using a triangular voltage signal

Sensore di campo elettrico completamente dielettrico in ottica integrata.

We report an electric field sensor based on a particular cofiguration of Mach-Zehnder interferometer (MZI). The device, fabricated on a Lithium Niobate substrate, is totally dielectric, without any presence of metallic electrodes. A modulation depth of 92% and an half wave voltage of 107.8 V were measured using a triangular voltage signal

Time Required to Rectify Inhaler Errors Among Experienced Subjects With Faulty Technique

BACKGROUND: Regardless of the device used, many patients have difficulty maintaining proper inhaler technique over time. Repeated education from caregivers is required to ensure persistence of correct inhaler technique, but no information is available to evaluate the time required to rectify inhaler errors in experienced users with a baseline faulty technique and whether this time of re-education to restore inhaler mastery can differ between devices.METHODS: This was a multi-center, single-visit, open-label, cross-sectional study in a large group of 981 adult subjects (mean ± SD age 64 ± 15 y) experienced with inhaler use, mainly suffering from COPD and asthma, who showed faulty inhaler technique at a follow-up visit in chest clinics. These subjects received face-to-face practical education from trained caregivers until proper inhaler use could be demonstrated, and the time of instruction was recorded.RESULTS: The mean times (95% CIs) in minutes of instruction required for rectifying misuse and demonstrating inhaler mastery were 5.0 (3.6-6.4) min for the Diskus (n = 199), 5.3 (3.7-6.8) min for the HandiHaler (n = 219), 8.1 (5.6-10.5) min for the metered-dose inhaler (MDI) (n = 532), and 6.0 (5.0-7.0) min for the Turbuhaler (n = 169). The time to demonstrate good inhaler use for MDIs was higher (P < .05) than for all dry powder inhalers (DPIs). Between the DPIs, only the HandiHaler required more time for achieving mastery than the Diskus (P = .005). The variables associated with increasing time for correcting inhaler errors were an older age (0.05 min/y, 95% CI 0.03-0.07), a lower level of education (0.4 min/schooling level, 95% CI 0.7-0.1), and no reported previous instruction in inhaler use (1.96 min, 95% CI 1.35-2.58).CONCLUSIONS: In experienced subjects with baseline faulty inhaler use, the mean time of education required to achieve and demonstrate mastery with DPIs was lower than with MDIs

B-lines:to count or not to count

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Combining L-Arginine with vitamin C improves long-COVID symptoms: The LINCOLN Survey

Recent evidence suggests that oxidative stress and endothelial dysfunction play critical roles in the pathophysiology of COVID-19 and Long-COVID. We hypothesized that a supplementation combining L-Arginine (to improve endothelial function) and Vitamin C (to reduce oxidation) could have favorable effects on Long-COVID symptoms