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https://www.readbyqxmd.com/read/29515001/smartphone-based-blood-pressure-monitoring-via-the-oscillometric-finger-pressing-method
#1
Anand Chandrasekhar, Chang-Sei Kim, Mohammed Naji, Keerthana Natarajan, Jin-Oh Hahn, Ramakrishna Mukkamala
High blood pressure (BP) is a major cardiovascular risk factor that is treatable, yet hypertension awareness and control rates are low. Ubiquitous BP monitoring technology could improve hypertension management, but existing devices require an inflatable cuff and are not compatible with such anytime, anywhere measurement of BP. We extended the oscillometric principle, which is used by most automatic cuff devices, to develop a cuff-less BP monitoring device using a smartphone. As the user presses her/his finger against the smartphone, the external pressure of the underlying artery is steadily increased while the phone measures the applied pressure and resulting variable-amplitude blood volume oscillations...
March 7, 2018: Science Translational Medicine
https://www.readbyqxmd.com/read/29318729/validation-of-modelflow-estimates-of-cardiac-output-in-hemodialysis-patients
#2
Clare MacEwen, Sheera Sutherland, Jonathan Daly, Christopher Pugh, Lionel Tarassenko
Volume-clamp technology (e.g. Finometer) has become a popular method of collecting continuous, non-invasive, hemodynamic information during hemodialysis. There is minimal data validating the technique in this patient group. A gold standard cardiac output measurement can be obtained using ultrasound dilution in patients with arterio-venous fistulae. Continuous cardiac output was measured in 124 hemodialysis sessions in 27 patients using a volume-clamp device (Finometer PRO). Ultrasound dilution measurement was first taken at baseline (Transonic HD03), then used to calibrate the Finometer...
January 10, 2018: Therapeutic Apheresis and Dialysis
https://www.readbyqxmd.com/read/29210137/hyperoxia-does-not-affect-oxygen-delivery-in-healthy-volunteers-while-causing-a-decrease-in-sublingual-perfusion
#3
Bob Smit, Yvo M Smulders, Etto C Eringa, Harry P M M Gelissen, Armand R J Girbes, Harm-Jan S de Grooth, Hans H M Schotman, Peter G Scheffer, Heleen M Oudemans-van Straaten, Angelique M E Spoelstra-de Man
OBJECTIVE: To determine the human dose-response relationship between a stepwise increase in arterial oxygen tension and its associated changes in DO2 and sublingual microcirculatory perfusion. METHODS: Fifteen healthy volunteers breathed increasing oxygen fractions for 10 minutes to reach arterial oxygen tensions of baseline (breathing air), 20, 40, 60 kPa, and max kPa (breathing oxygen). Systemic hemodynamics were measured continuously by the volume-clamp method...
February 2018: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29204425/continuous-non-invasive-arterial-pressure-assessment-during-surgery-to-improve-outcome
#4
REVIEW
Alena Stenglova, Jan Benes
Blood pressure (BP) is one of the most important variables evaluated during almost every medical examination. Most national anesthesiology societies recommend BP monitoring at least once every 5 min in anesthetized subjects undergoing surgical procedures. In most cases, BP is monitored non-invasively using oscillometric cuffs. Although the risk of arterial cannulation is not very high, the invasive BP monitoring is usually indicated only in the case of high-risk patients or in complex surgical procedures...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/29189276/perioperative-noninvasive-blood-pressure-monitoring
#5
Kai Kuck, Philip D Baker
The most commonly monitored variable for perioperative hemodynamic management is blood pressure. Several indirect noninvasive blood pressure monitoring techniques have been developed over the last century, including intermittent techniques such as auscultation (Riva-Rocci and Korotkoff) and oscillometry (Marey) and continuous techniques. With the introduction of automated noninvasive blood pressure devices in the 1970s, the oscillometric technique quickly became and remains the standard for automated, intermittent blood pressure measurement...
November 17, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29108815/noninvasive-bp-monitoring-in-the-critically-ill-time-to-abandon-the-arterial-catheter
#6
REVIEW
Karim Lakhal, Stephan Ehrmann, Thierry Boulain
Although its reliability is often questioned, noninvasive BP (NIBP)-monitoring with an oscillometric arm cuff is widely used, even in critically ill patients in shock. When correctly implemented, modern arm NIBP devices can provide accurate and precise measurements of mean BP, as well as clinically meaningful information such as identification of hypotension and hypertension and monitoring of patient response to therapy. Even in specific circumstances such as arrhythmia, hypotension, vasopressor infusion, and possibly in obese patients, arm NIBP may be useful, contrary to widespread belief...
November 3, 2017: Chest
https://www.readbyqxmd.com/read/28937241/preejection-period-as-a-sympathetic-activity-index-a-role-of-confounding-factors
#7
J Krohova, B Czippelova, Z Turianikova, Z Lazarova, I Tonhajzerova, M Javorka
In previous studies, one of the systolic time intervals - preejection period (PEP) - was used as an index of sympathetic activity reflecting the cardiac contractility. However, PEP could be also influenced by several other cardiovascular variables including preload, afterload and diastolic blood pressure (DBP). The aim of this study was to assess the behavior of the PEP together with other potentially confounding cardiovascular system characteristics in healthy humans during mental and orthostatic stress (head-up tilt test - HUT)...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28688009/comparing-volume-clamp-method-and-intra-arterial-blood-pressure-measurements-in-patients-with-atrial-fibrillation-admitted-to-the-intensive-or-medium-care-unit
#8
G F N Berkelmans, S Kuipers, B E Westerhof, A M E Spoelstra-de Man, Y M Smulders
International guidelines highlight the importance of blood pressure (BP) in patients with atrial fibrillation (AF). However, BP measurement in AF is complicated by beat-to-beat fluctuation. Automated BP measurement devices are not validated for patients with AF and no consensus exists on how to measure BP in AF manually. Beat-to-beat BP measurement using the volume-clamp method (VCM) could represent a non-invasive method to accurately assess BP, but has not been validated in AF. 31 admitted patients with sustained AF and 10 control patients with sinus rhythm underwent simultaneous intra-arterial and non-invasive BP measurement using a VCM monitor (Nexfin(®), BMEYE, Amsterdam, The Netherlands)...
July 7, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28540614/a-comparison-of-volume-clamp-method-based-continuous-noninvasive-cardiac-output-cnco-measurement-versus-intermittent-pulmonary-artery-thermodilution-in-postoperative-cardiothoracic-surgery-patients
#9
Julia Y Wagner, Annmarie Körner, Leonie Schulte-Uentrop, Mathias Kubik, Hermann Reichenspurner, Stefan Kluge, Daniel A Reuter, Bernd Saugel
The CNAP technology (CNSystems Medizintechnik AG, Graz, Austria) allows continuous noninvasive arterial pressure waveform recording based on the volume clamp method and estimation of cardiac output (CO) by pulse contour analysis. We compared CNAP-derived CO measurements (CNCO) with intermittent invasive CO measurements (pulmonary artery catheter; PAC-CO) in postoperative cardiothoracic surgery patients. In 51 intensive care unit patients after cardiothoracic surgery, we measured PAC-CO (criterion standard) and CNCO at three different time points...
May 24, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28113793/continuous-blood-pressure-measurement-from-invasive-to-unobtrusive-celebration-of-200th-birth-anniversary-of-carl-ludwig
#10
Xiao-Rong Ding, Ni Zhao, Guang-Zhong Yang, Roderic Pettigrew, Benny Lo, Fen Miao, Ye Li, Jing Liu, Yuan-Ting Zhang
The year 2016 marks the 200th birth anniversary of Carl Friedrich Wilhelm Ludwig (1816-1895). As one of the most remarkable scientists, Ludwig invented the kymograph, which for the first time enabled the recording of continuous blood pressure (BP), opening the door to the modern study of physiology. Almost a century later, intra-arterial BP monitoring through an arterial line has been used clinically. Subsequently, arterial tonometry and volume clamp method were developed and applied in continuous BP measurement in a noninvasive way...
October 25, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28113184/continuous-blood-pressure-measurement-from-invasive-to-unobtrusive-celebration-of-200th-birth-anniversary-of-carl-ludwig
#11
REVIEW
Xiao-Rong Ding, Ni Zhao, Guang-Zhong Yang, Roderic I Pettigrew, Benny Lo, Fen Miao, Ye Li, Jing Liu, Yuan-Ting Zhang
The year 2016 marks the 200th birth anniversary of Carl Friedrich Wilhelm Ludwig (1816-1895). As one of the most remarkable scientists, Ludwig invented the kymograph, which for the first time enabled the recording of continuous blood pressure (BP), opening the door to the modern study of physiology. Almost a century later, intraarterial BP monitoring through an arterial line has been used clinically. Subsequently, arterial tonometry and volume clamp method were developed and applied in continuous BP measurement in a noninvasive way...
November 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28039242/non-invasive-assessment-of-fluid-responsiveness-using-cnap%C3%A2-technology-is-interchangeable-with-invasive-arterial-measurements-during-major-open-abdominal-surgery
#12
J Renner, M Gruenewald, M Hill, L Mangelsdorff, H Aselmann, C Ilies, M Steinfath, O Broch
BACKGROUND: Dynamic variables of fluid responsiveness (FR), such as pulse pressure variation (PPV), have been shown to predict the response to a fluid challenge accurately. A recently introduced non-invasive technology based on the volume-clamp method (CNAP™) offers the ability to measure PPV continuously (PPVCNAP). However, the accuracy regarding the prediction of FR in the operating room has to be proved. METHODS: We compared PPVCNAP with an invasive approach measuring PPV using the PiCCO technology (PPVPiCCO)...
January 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/27939486/changes-in-cerebral-autoregulation-in-the-second-half-of-pregnancy-and-compared-to-non-pregnant-controls
#13
Teelkien R van Veen, Ronney B Panerai, Sina Haeri, Paul P van den Berg, Gerda G Zeeman, Michael A Belfort
OBJECTIVE: The mechanism by which pregnancy affects the cerebral circulation is unknown, but it has a central role in the development of neurological complications in preeclampsia, which is believed to be related to impaired autoregulation. We evaluated the cerebral autoregulation in the second half of pregnancy, and compared this with a control group of healthy, fertile non-pregnant women. METHODS: In a prospective cohort analysis, cerebral blood flow velocity of the middle cerebral artery (determined by transcranial Doppler), blood pressure (noninvasive arterial volume clamping), and end-tidal carbon dioxide (EtCO2) were simultaneously collected for 7min...
October 2016: Pregnancy Hypertension
https://www.readbyqxmd.com/read/27195632/blood-pressure-monitoring-for-the-anesthesiologist-a-practical-review
#14
REVIEW
Karsten Bartels, Stephen A Esper, Robert H Thiele
Periodic, quantitative measurement of blood pressure (BP) in humans, predating the era of evidence-based medicine by over a century, is a component of the American Society of Anesthesiologists standards for basic anesthetic monitoring and is a staple of anesthetic management worldwide. Adherence to traditional BP parameters complicates the ability of investigators to determine whether particular BP ranges confer any clinical benefits. The BP waveform is a complex amalgamation of both antegrade and retrograde (reflected) pressure waves and is affected by vascular compliance, distance from the left ventricle, and the 3D structure of the vascular tree...
June 2016: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/26998648/noninvasive-hemodynamic-measurements-during-neurosurgical-procedures-in-sitting-position
#15
Patrick Schramm, Irene Tzanova, Tilman Gööck, Frank Hagen, Irene Schmidtmann, Kristin Engelhard, Gunther Pestel
BACKGROUND: Neurosurgical procedures in sitting position need advanced cardiovascular monitoring. Transesophageal echocardiography (TEE) to measure cardiac output (CO)/cardiac index (CI) and stroke volume (SV), and invasive arterial blood pressure measurements for systolic (ABPsys), diastolic (ABPdiast) and mean arterial pressure (MAP) are established monitoring technologies for these kind of procedures. A noninvasive device for continuous monitoring of blood pressure and CO based on a modified Penaz technique (volume-clamp method) was introduced recently...
July 2017: Journal of Neurosurgical Anesthesiology
https://www.readbyqxmd.com/read/26531867/reduced-baroreflex-sensitivity-in-patients-with-vasovagal-syncope
#16
P Mitro, M Simurda, L Evin, P Murin, E Muller
OBJECTIVES: The evidence is conflicting regarding the role of baroreflex in patients with vasovagal syncope. The aim of the study was to measure baroreflex sensitivity (BRS) and hemodynamic parameters during head up tilt test (HUT) with nitroglycerine stimulation. METHODS: Nitroglycerine stimulated HUT was performed in 51 patients with the history of recurrent syncope (mean age 46±19 years, 18 men, 23 women). Cardiac output (CO), stroke volume (SV), left-ventricular ejection time (LVET) and total peripheral resistance (TPR) were assessed during HUT by volume-clamp method using a beat-to-beat photopletysmography...
2015: Bratislavské Lekárske Listy
https://www.readbyqxmd.com/read/26335905/noninvasive-pulse-pressure-variation-and-stroke-volume-variation-to-predict-fluid-responsiveness-at-multiple-thresholds-a-prospective-observational-study
#17
Jaap Jan Vos, Marieke Poterman, Pieternel Papineau Salm, Kai Van Amsterdam, Michel M R F Struys, Thomas W L Scheeren, Alain F Kalmar
BACKGROUND: Pulse pressure variation (PPV) and stroke volume variation (SVV) are dynamic preload variables that can be measured noninvasively to assess fluid responsiveness (FR) in anesthetized patients with mechanical ventilation. Few studies have examined the effectiveness of predicting FR according to the definition of FR, and assessment of inconclusive values of PPV and SVV around the cut-off value (the "grey zone") might improve individual FR prediction. We explored the ability of noninvasive volume clamp derived measurements of PPV and SVV to predict FR using the grey zone approach, and we assessed the influence of multiple thresholds on the predictive ability of the numerical definition of FR...
November 2015: Canadian Journal of Anaesthesia, Journal Canadien D'anesthésie
https://www.readbyqxmd.com/read/26286887/blood-pressure-monitoring-during-exercise-comparison-of-pulse-transit-time-and-volume-clamp-methods
#18
Thomas Wibmer, Coy Denner, Christoph Fischer, Benedikt Schildge, Stefan Rüdiger, Cornelia Kropf-Sanchen, Wolfgang Rottbauer, Christian Schumann
During physical exercise, pulse transit time (PTT), expressed as the interval between ventricular electrical activity and peripheral pulse wave, may provide a surrogate estimate for blood pressure by the use of specific calibration procedures. The objective of this study was to determine systolic blood pressure (SBP) values derived from the PTT method and from an established method of non-invasive continuous blood pressure measurement based on the volume clamp technique, and to compare their agreement with sphygmomanometry during exercise tests...
2015: Blood Pressure
https://www.readbyqxmd.com/read/26286382/advances-in-photoplethysmography-beyond-arterial-oxygen-saturation
#19
REVIEW
Karsten Bartels, Robert H Thiele
PURPOSE: Photoplethysmography permits continuous measurement of heart rate and peripheral oxygen saturation and has been widely used to inform clinical decisions. Recently, a myriad of noninvasive hemodynamic monitoring devices using this same technology have been increasingly available. This narrative review aims to summarize the principles that form the basis for the function of these devices as well as to comment on trials evaluating their accuracy and clinical application. PRINCIPAL FINDINGS: Advanced monitoring devices extend photoplethysmography technology beyond measuring oxygen concentration and heart rate...
December 2015: Canadian Journal of Anaesthesia, Journal Canadien D'anesthésie
https://www.readbyqxmd.com/read/26230147/blood-pressure-monitoring-during-exercise-comparison-of-pulse-transit-time-and-volume-clamp-methods
#20
Thomas Wibmer, Coy Denner, Christoph Fischer, Benedikt Schildge, Stefan Rüdiger, Cornelia Kropf-Sanchen, Wolfgang Rottbauer, Christian Schumann
During physical exercise, pulse transit time (PTT), expressed as the interval between ventricular electrical activity and peripheral pulse wave, may provide a surrogate estimate for blood pressure by the use of specific calibration procedures. The objective of this study was to determine systolic blood pressure (SBP) values derived from the PTT method and from an established method of non-invasive continuous blood pressure measurement based on the volume clamp technique, and to compare their agreement with sphygmomanometry during exercise tests...
July 31, 2015: Blood Pressure
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