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Cuff deflation

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https://www.readbyqxmd.com/read/29136608/variation-of-the-korotkoff-stethoscope-sounds-during-blood-pressure-measurement-analysis-using-a-convolutional-neural-network
#1
Fan Pan, Peiyu He, Chengyu Liu, Taiyong Li, Alan Murray, Dingchang Zheng
Korotkoff sounds are known to change their characteristics during blood pressure (BP) measurement, resulting in some uncertainties for systolic and diastolic pressure (SBP and DBP) determinations. The aim of this study was to assess the variation of Korotkoff sounds during BP measurement by examining all stethoscope sounds associated with each heartbeat from above systole to below diastole during linear cuff deflation. Three repeat BP measurements were taken from 140 healthy subjects (age 21 to 73 years; 62 female and 78 male) by a trained observer, giving 420 measurements...
November 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/29135491/agreement-analysis-of-oscillometric-devices-in-the-measure-of-resting-heart-rate-in-breast-cancer-survivors
#2
Mariana R Palma, Luiz C M Vanderlei, Fernanda E Ribeiro, Rafaela C C de Andrade, Cristina E P T Fregonesi, Ismael F Freitas Júnior, Diego G D Christofaro
OBJECTIVE: The aim of this study was to verify the reproducibility of an oscillometric device in the measurement of resting heart rate (RHR) in breast cancer survivors. METHODS: This study included 85 breast cancer survivors with a mean age of 58.87±10.03 years. For the RHR evaluation, the equipment used was the Omron HEM 742, electronic and digital arm device, for measurement of blood pressure and heart rate (HR), with automatic cuff inflation and deflation. At the same time as the oscillometric measurement, HR was measured by the HR monitor Polar RS800 CX, which has been validated previously for HR uptake...
November 10, 2017: Blood Pressure Monitoring
https://www.readbyqxmd.com/read/29119549/a-prototype-small-bore-ventilation-catheter-with-a-cuff-cuff-inflation-optimizes-ventilation-with-the-ventrain
#3
M W P de Wolf, T van der Beek, A E Hamaekers, M Theunissen, D Enk
BACKGROUND: Ventilation through small-diameter tubes typically precludes use of a cuff as this will impede the necessary passive outflow of gas alongside the tube's outer surface. Ventrain assists expiration and enables oxygenation and normoventilation through small-bore cannulas or catheters, particularly in obstructed airways. A small-bore ventilation catheter (SBVC; 40 cm long, 2.2 mm inner diameter) with a separate pressure monitoring lumen and a cuff was developed. Efficacy of oxygenation and ventilation with Ventrain through this catheter was investigated in sealed and open airways in a porcine cross-over study...
November 8, 2017: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/29118964/development-of-a-blood-pressure-measurement-instrument-with-active-cuff-pressure-control-schemes
#4
Chung-Hsien Kuo, Chun-Ju Wu, Hung-Chyun Chou, Guan-Ting Chen, Yu-Cheng Kuo
This paper presents an oscillometric blood pressure (BP) measurement approach based on the active control schemes of cuff pressure. Compared with conventional electronic BP instruments, the novelty of the proposed BP measurement approach is to utilize a variable volume chamber which actively and stably alters the cuff pressure during inflating or deflating cycles. The variable volume chamber is operated with a closed-loop pressure control scheme, and it is activated by controlling the piston position of a single-acting cylinder driven by a screw motor...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29089581/central-blood-pressure-monitoring-via-a-standard-automatic-arm-cuff
#5
Keerthana Natarajan, Hao-Min Cheng, Jiankun Liu, Mingwu Gao, Shih-Hsien Sung, Chen-Huan Chen, Jin-Oh Hahn, Ramakrishna Mukkamala
Current oscillometric devices for monitoring central blood pressure (BP) maintain the cuff pressure at a constant level to acquire a pulse volume plethysmography (PVP) waveform and calibrate it to brachial BP levels estimated with population average methods. A physiologic method was developed to further advance central BP measurement. A patient-specific method was applied to estimate brachial BP levels from a cuff pressure waveform obtained during conventional deflation via a nonlinear arterial compliance model...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29018632/patient-specific-oscillometric-blood-pressure-measurement-validation-for-accuracy-and-repeatability
#6
Jiankun Liu, Hao-Min Cheng, Chen-Huan Chen, Shih-Hsien Sung, Jin-Oh Hahn, Ramakrishna Mukkamala
Oscillometric devices are widely used for automatic cuff blood pressure (BP) measurement. These devices estimate BP from the oscillometric cuff pressure waveform using population average methods. Hence, the devices may only be accurate over a limited BP range. The objective was to evaluate a new patient-specific method, which estimates BP by fitting a physiologic model to the same waveform. One-hundred and forty-five cardiac catheterization patients and normal adults were included for study. The oscillometric cuff pressure waveform was obtained with an office device, while reference BP was measured via brachial artery catheterization or auscultation, during baseline and/or nitroglycerin administration...
2017: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/28980297/remote-ischemic-preconditioning-of-human-myocardium-ripe-study-protocol-for-a-double-blinded-randomized-controlled-trial
#7
Marek A Deja, Ryszard Wiaderkiewicz, Piotr Czekaj, Ewa Czech, Marcin Malinowski, Leszek Machej, Andrzej Węglarzy, Adam Kowalówka, Magda Piekarska, Bartosz Szurlej, Tomasz Latusek
BACKGROUND: Remote preconditioning was showed to be a potent protective phenomenon in many animals. Several studies aimed to demonstrate it was feasible in humans by trying to show its protective effect during cardiac surgery. Of these studies some small studies and one bigger trial were positive while two other bigger studies showed no effectiveness of remote preconditioning as assessed by levels of postoperatively released cardiac markers. Recently two large clinical trials also failed to prove the benefit of remote preconditioning in cardiac surgery...
October 5, 2017: Kardiologia Polska
https://www.readbyqxmd.com/read/28972197/coherent-averaging-of-pseudorandom-binary-stimuli-is-the-dynamic-cerebral-autoregulatory-response-symmetrical
#8
Emmanuel Katsogridakis, David M Simpson, Glen Bush, Lingke Fan, Anthony A Birch, Robert Allen, John F Potter, Ronney B Panerai
Previous studies on cerebral autoregulation have shown the existence of hemispheric symmetry, which may be altered in stroke and traumatic brain injury. There is a paucity of data however on whether the response is symmetrical between those disturbances that cause cerebral hyperperfusion, to those that cause hypoperfusion. Our aim was to investigate whether the responses of cerebral autoregulation to haemodynamic stimuli of different directions are symmetrical. Approach: Using a previously described assessment method, we employed coherent averaging of the cerebral blood flow velocity (CBFV) responses to thigh cuff inflation and deflation, as driven by pseudorandom binary sequences, whilst simultaneously altering the inspired CO2...
October 3, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28940873/fetal-head-position-and-perineal-distension-associated-with-the-use-of-the-bd-odon-device%C3%A2-in-operative-vaginal-birth-a-simulation-study
#9
S M O'Brien, C Winter, C A Burden, M Boulvain, T J Draycott, J F Crofts
OBJECTIVE: To investigate (1) the placement of the BD Odon Device on the model fetal head and (2) perineal distention during simulated operative vaginal births conducted with the BD Odon Device. DESIGN: Observational simulation study. SETTING: North Bristol NHS Trust, UK. POPULATION OR SAMPLE: Four hundred and forty simulated operative vaginal births. METHODS: Three bespoke fetal mannequins were developed to represent (1) bi-parietal diameter of the 50th centile at term, (2) bi-parietal diameter at the 5th centile at term, and (3) 50th centile head with 2 cm of caput...
September 2017: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28893433/effects-of-remote-ischemic-preconditioning-in-patients-with-concentric-myocardial-hypertrophy-a-randomized-controlled-trial-with-molecular-insights
#10
Young Song, Jong Wook Song, Sak Lee, Ji-Hae Jun, Young-Lan Kwak, Jae-Kwang Shim
BACKGROUND: Efficacy of remote ischemic preconditioning (RIPC) for cardioprotection in cardiac surgery is controversial. We aimed to evaluate the clinical and molecular effects of RIPC on the concentrically hypertrophied myocardium. METHODS: Seventy-two aortic stenosis patients receiving aortic valve replacement (AVR) under sevoflurane anesthesia were randomly allocated to RIPC (3cycles of 5-min inflation [300mmHg] and deflation on the left arm) or control (deflated cuff placement) group...
December 15, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28866975/influence-of-changing-endotracheal-tube-cuff-management-on-antibiotic-use-for-ventilator-associated-pneumonia-in-a-tertiary-intensive-care-unit
#11
Jai N Darvall, Irani Thevarajan, Simon Iles, Thomas Rechnitzer, Tim Spelman, Nerina Harley
BACKGROUND: Routine deflation of the endotracheal tube (ETT) cuff of critically ill patients receiving MV is common in Australia and New Zealand. Literature about ventilatorassociated pneumonia (VAP) and antibiotic use rates with different ETT cuff maintenance practices is lacking. OBJECTIVE: To determine the impact of a change in ETT cuff maintenance from a minimal leak technique to pressure manometry on the administration of antibiotics for VAP. DESIGN, SETTING AND PARTICIPANTS: A prospective, pre- post observational study conducted in a metropolitan tertiary referral intensive care unit...
September 2017: Critical Care and Resuscitation: Journal of the Australasian Academy of Critical Care Medicine
https://www.readbyqxmd.com/read/28860964/inter-individual-relationships-between-sympathetic-arterial-baroreflex-function-and-cerebral-perfusion-control-in-healthy-males
#12
Trevor Witter, Yu-Chieh Tzeng, Terry O'Donnell, Jessica Kusel, Bridget Walker, Mary Berry, Chloe E Taylor
Maintenance of adequate cerebral perfusion during normal physiological challenges requires integration between cerebral blood flow (CBF) and systemic blood pressure control mechanisms. Previous studies have shown that cardiac baroreflex sensitivity (BRS) is inversely related to some measures of cerebral autoregulation. However, interactions between the sympathetic arterial baroreflex and cerebral perfusion control mechanisms have not been explored. To determine the nature and magnitude of these interactions we measured R-R interval, blood pressure, CBF velocity, and muscle sympathetic nerve activity (MSNA) in 11 healthy young males...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28704612/blood-flow-in-humans-following-low-load-exercise-with-and-without-blood-flow-restriction
#13
J Grant Mouser, Gilberto C Laurentino, Scott J Dankel, Samuel L Buckner, Matthew B Jessee, Brittany R Counts, Kevin T Mattocks, Jeremy P Loenneke
Blood flow restriction (BFR) in combination with exercise has been used to increase muscle size and strength using relatively low loads (20%-30% 1-repetition maximum (1RM)). In research, the range of applied pressures based on a percentage of arterial occlusion pressure (AOP), is wide. The purpose of the study is to measure the blood flow response before exercise, following each set of exercise, and postexercise to low-load elbow flexion combined with no restriction (NOBFR), 40% of AOP (40BFR), and 80% of AOP (80BFR)...
July 13, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28699322/a-respiratory-marker-derived-from-left-vagus-nerve-signals-recorded-with-implantable-cuff-electrodes
#14
Cristian Sevcencu, Thomas N Nielsen, Benedict Kjaergaard, Johannes J Struijk
OBJECTIVE: Left vagus nerve (LVN) stimulation (LVNS) has been tested for lowering the blood pressure (BP) in patients with resistant hypertension (RH). Whereas, closed-loop LVNS (CL-LVNS) driven by a BP marker may be superior to open-loop LVNS, there are situations (e.g., exercising) when hypertension is normal. Therefore, an ideal anti-RH CL-LVNS system requires a variable to avoid stimulation in such conditions, for example, a respiratory marker ideally extracted from the LVN. As the LVN conducts respiratory signals, this study aimed to investigate if such signals can be recorded using implantable means and if a marker to monitor respiration could be derived from such recordings...
July 11, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28648106/pressure-autoregulation-measurement-techniques-in-adult-traumatic-brain-injury-part-i-a-scoping-review-of-intermittent-semi-intermittent-methods
#15
Frederick A Zeiler, Joseph Donnelly, Leanne Calviello, David K Menon, Peter Smielewski, Marek Czosnyka
The purpose of this study was to perform a systematic, scoping review of commonly described intermittent/semi-intermittent autoregulation measurement techniques in adult traumatic brain injury (TBI). Nine separate systematic reviews were conducted for each intermittent technique: computed tomographic perfusion (CTP)/Xenon-CT (Xe-CT), positron emission tomography (PET), magnetic resonance imaging (MRI), arteriovenous difference in oxygen (AVDO2) technique, thigh cuff deflation technique (TCDT), transient hyperemic response test (THRT), orthostatic hypotension test (OHT), mean flow index (Mx), and transfer function autoregulation index (TF-ARI)...
September 26, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28635221/-treatment-of-intractable-aspiration-after-partial-laryngectomy-by-cuffed-tracheostomy-tube-with-inner-cannula
#16
P Wang, Y H Liu, Q S Xu, Z S Zheng
Objective: To evaluate the efficacy of cuffed tracheostomy tube with inner cannula for the treatment of intractable aspiration after partial laryngectomy. Methods: From May 2010 to June 2015, 15 patients with intractable aspiration after partial laryngectomy of laryngeal and hypopharyngeal carcinoma were enrolled. Cuffed tracheostomy tube with inner cannula was used in the 15 patients for treatment of intractable aspiration. The patients and their family were trained to manage the cuffed tracheostomy tube with inner cannula and to eat since the 14th day after surgery...
June 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/28611896/pain-perception-in-latino-vs-caucasian-and-male-vs-female-patients-is-there-really-a-difference
#17
Molly Aufiero, Holly Stankewicz, Shaila Quazi, Jeanne Jacoby, Jill Stoltzfus
INTRODUCTION: Pain is a common emergency department (ED) complaint. It is important to understand the differences in pain perception among different ethnic and demographic populations. METHODS: We applied a standardized painful stimulus to Caucasian and Latino adult patients to determine whether the level of pain reported differed depending on ethnicity (N=100; 50 Caucasian [C], 50 Latino [L] patients) and gender (N=100; 59 female, 41 male). Patients had an initial pain score of 0 or 1...
June 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28590309/comparison-of-laryngeal-mask-airway-insertion-methods-including-the-external-larynx-lift-with-pre-inflated-cuff-on-postoperative-pharyngolaryngeal-complications-a-randomised-clinical-trial
#18
Ling-Qun Hu, Olga S Leavitt, Christine Malwitz, Haisook Kim, Robert A Doty, Robert J McCarthy
BACKGROUND: Postoperative pharyngolaryngeal complications are commonly reported following laryngeal mask airway (LMA) insertion. After induction of anaesthesia, the airway structures fall backwards under the influence of gravity, and this may contribute to difficulty in placement of a LMA. External airway alignment by lifting the larynx during insertion of an airway may avoid collision of the airway with laryngeal structures. OBJECTIVE(S): To compare pharyngolaryngeal complications after either conventional airway insertion with or without cuff semi-inflation and a method, including an external larynx lift...
July 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/28533100/effects-of-remote-ischaemic-conditioning-on-heart-rate-variability-and-cardiac-function-in-patients-with-mild-ischaemic-heart-failure
#19
Long Chen, Qianxing Zhou, Hong Jin, Kongbo Zhu, Hong Zhi, Zhongpu Chen, Genshan Ma
BACKGROUND: Cardioprotective effects of remote ischaemic conditioning (RIC) in the setting of ischaemic heart disease have been shown recently. But the effects of RIC on heart rate variability (HRV) and cardiac function in patients with stable ischaemic heart failure (IHF) are still unknown. METHODS: Fifty patients with stable IHF were enrolled and randomly divided into RIC group and control group. Remote ischaemic conditioning treatment was performed twice a day for six weeks...
May 3, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28515120/remote-ischemic-perconditioning-to-reduce-reperfusion-injury-during-acute-st-segment-elevation-myocardial-infarction-a-systematic-review-and-meta-analysis
#20
REVIEW
Shelley L McLeod, Alla Iansavichene, Sheldon Cheskes
BACKGROUND: Remote ischemic conditioning (RIC) is a noninvasive therapeutic strategy that uses brief cycles of blood pressure cuff inflation and deflation to protect the myocardium against ischemia-reperfusion injury. The objective of this systematic review was to determine the impact of RIC on myocardial salvage index, infarct size, and major adverse cardiovascular events when initiated before catheterization. METHODS AND RESULTS: Electronic searches of Medline, Embase, and Cochrane Central Register of Controlled Trials were conducted and reference lists were hand searched...
May 17, 2017: Journal of the American Heart Association
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