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Anesthesia Monitoring and Management
Published in Michele Barletta, Jane Quandt, Rachel Reed, Equine Anesthesia and Pain Management, 2023
Automatic oscillometric technique It uses an air-filled cuff placed around the tail or leg (Figure 7.10).Good equivalence for mean arterial pressure was found between oscillometric technique and invasive measurements when the cuff width-to-tail circumference ratio was 0.25 and the cuff was placed on the tail.The cuff is inflated to a pressure in excess of systolic blood pressure, then slowly released. Arterial pressure pulsations cause pressure oscillations within the cuff as the pressure falls. These oscillations are superimposed over a declining pressure curve. Systolic pressure is where the fluctuations begin to increase in size and MAP is where the fluctuations are the largest. These devices are automatic and give a digital readout.They become less accurate when the MAP is < 65 mmHg.
Wearable Sensors for Blood Perfusion Monitoring in Patients with Diabetes Mellitus
Published in Andrey V. Dunaev, Valery V. Tuchin, Biomedical Photonics for Diabetes Research, 2023
Evgenii A. Zherebtsov, Elena V. Zharkikh, Yulia I. Loktionova, Angelina I. Zherebtsova, Viktor V. Sidorov, Alexander I. Krupatkin, Andrey V. Dunaev
Blood flow oscillations are of hemodynamic significance. An increase in the amplitudes of oscillations in the active tone-forming frequency ranges is accompanied by a decrease in the effective resistance to blood flow.
Ards Treatment
Published in Stephen M. Cohn, Alan Lisbon, Stephen Heard, 50 Landmark Papers, 2021
Bruck Or, Kodela Jennifer, Kopec Scott
In the 20 years since the publication of the ARDSnet trial, low tidal volume and lung-protective ventilation strategies have become the standard of care for managing patients with acute lung injury. Its findings have been supported in several follow-up studies, including a Cochrane meta-analysis [11]. Not only have we seen a drop in the mortality rate from around 36% to 25% for patients with acute lung injury [7], this landmark study helped open the door to further understanding of the effects of mechanical ventilation on the injured lung, and the management of patients with acute lung injury. Since its publication, other studies have demonstrated the positive effects of using higher PEEP values and maintaining lower driving pressures [12]. On the other hand, other novel ventilatory strategies, such as high-frequency oscillation, where tidal volumes should be low, have been shown to be without benefit compared to traditional low volume mechanical ventilation.
Biodegradable gemcitabine-loaded microdevice with sustained local drug delivery and improved tumor recurrence inhibition abilities for postoperative pancreatic tumor treatment
Published in Drug Delivery, 2022
Xiangming Kong, Miao Feng, Lihuang Wu, Yiyan He, Hongli Mao, Zhongwei Gu
Microdevices were designed into several groups with different molecular weights of PEG and different raw material ratios, as shown in Table S1. Weigh all the materials according to the designed ratio and dissolve them in DMF, then filter them once with a 0.45 μm filter membrane, and finally remove all DMF by rotary evaporation to obtain a mixture of materials. The rheological properties of the mixture at 150 °C were tested with a rheometer. The shear rate varied from 1 to 100 s−1 in dynamic viscosity test, and the constant oscillation frequency was chosen as 1 Hz in modulus test. The blend material was melted and processed under the condition of 150 °C by the laboratory preparation method, and the microdevices were prepared into a cylindrical rod with a length of 10 mm and a diameter of 1 mm.
Development of a device to measure adherence and pressure characteristics of positive expiratory pressure therapies used by adults with cystic fibrosis
Published in Physiotherapy Theory and Practice, 2022
Nathan Ward, Bruce Ward, Kathy Stiller, Amanda Kenyon, Anne E Holland
The oscillation frequencies seen in the current study (Table 3) for the Acapella DH® were slightly higher than those identified previously during supervised use by adults with CF (McCarren and Alison, 2006), but were similar to those found in laboratory studies when 20–30lpm flow rates were used (Dos Santos, Guimaraes, de Carvalho, and Gastaldi, 2013; Franks et al., 2019; Suggett, Meyer, Costella, and Mitchell, 2014). While we found statistically significant differences in mean oscillation frequency and amplitude between the Acapella DH® and Aerobika®, these were small in magnitude and so of questionable clinical importance. Both OscPEP devices demonstrated significant between-participant variability in oscillation frequency and amplitude, suggesting user technique may affect the pressure properties. This reinforces the importance of proper instruction in use of the OscPEP devices. Further studies are required to determine if differences in oscillation frequency and amplitude between OscPEP devices affect clinical outcomes.
Can Individuals with Down Syndrome Benefit from Hippotherapy? An Exploratory Study on Gait and Balance
Published in Developmental Neurorehabilitation, 2020
Simona Portaro, Alberto Cacciola, Antonino Naro, Filippo Cavallaro, Gaetano Gemelli, Barbara Aliberti, Rosaria De Luca, Rocco Salvatore Calabrò, Demetrio Milardi
The stabilometric variables assessed were: i) CoP, as a quantitative assessment of postural control, in quiet stance, such as postural sway and postural area; ii) mediolateral velocity of oscillations; iii) anteroposterior velocity of oscillations. Each test, lasting 30 seconds, was alternately recorded for each condition (EC and EO), since it has been demonstrated that walking is strictly influenced by vision, which is essential for the position of the body in the space during the walk cycle and the postural control.24 For both baropodometric and stabilometric evaluations, DS patients were instructed to maintain an upright bi-podalic standing position, with feet wide apart at 30°, arms at their sides and with gaze straight ahead to a 3 meters distant achromatic target in EO.