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A novel breath pattern model and analysis to minimize patient discomfort in medical ventilators.
Sci Rep
January 2025
Department of Mechanical Engineering, PSG Institute of Technology and Applied Research, Coimbatore, 641026, India.
Typical waveforms used for the simulation of pressure and volume-controlled ventilation in medical ventilators have been extensively studied in the literature. The majority of simulation studies reported employ the step pattern or ramp pattern to model the pressure and flow variations in pressure/volume-controlled ventilation. It was observed that the above waveforms tend to add to the discomfort level of patients due to the presence of jerks in derivatives of pressure/flow variations; the pressure/flow variation of air and oxygen mixture should be smooth so that the patient discomfort is kept at a minimal level.
View Article and Find Full Text PDFCerebrovascular Compliance during Progressive Hypotension in Patients with Autonomic Failure.
J Appl Physiol (1985)
January 2025
School of Kinesiology, Western University, London, Ontario, Canada.
The compliant nature of cerebral blood vessels may represent an important mechanical protection for sustained cerebral perfusion during reductions in arterial blood pressure (ABP). However, whether the rise in cerebrovascular compliance (Ci) with falling ABP persists and exhibits a threshold effect remains unknown. Therefore, we analyzed Ci changes during graded head-up tilt (HUT) in individuals with autonomic failure (AF), a group that tolerates graded and progressive reductions in ABP.
View Article and Find Full Text PDFCan switching stimulus polarity identify Meniere's disease? A preliminary investigation on ABR.
Acta Otolaryngol
January 2025
School of Audiology and Speech Language Pathology, Bharati Vidyapeeth (Deemed to be University), Pune, India.
Background: Meniere's disease (MD) affects 0.2% to 0.5% of the global population, with regional variations.
View Article and Find Full Text PDFCurrent Concepts in Fluid Resuscitation and Vasopressor Use in Cirrhosis.
Semin Liver Dis
January 2025
Hepatology, University of Pennsylvania, Philadelphia, United States.
Critically ill patients with cirrhosis and liver failure not uncommonly have hypotension due to multifactorial reasons, that include hyperdynamic state with increased cardiac index, low systemic vascular resistance due to portal hypertension, following the use of beta blocker or diuretic therapy, and severe sepsis. These changes are mediated by microvascular alterations in the liver, systemic inflammation, activation of renin angiotensin aldosterone system, and vasodilatation due to endothelial dysfunction. Hemodynamic assessment includes measuring inferior vena cava indices, cardiac output and systemic vascular resistance using point-of-care ultrasound (POCUS), in addition to arterial waveform analysis, or pulmonary artery pressures, and lactate clearance to guide fluid resuscitation.
View Article and Find Full Text PDFIncreased Afferent Nerve Firing Is Correlated With the Detection of Bladder Wall Micromotion in a Perfused Ex-Vivo Porcine Model.
Neurourol Urodyn
January 2025
Department of Surgery, Division of Urology, Virginia Commonwealth University Health System, Richmond, Virginia, USA.
Introduction And Objective: Observable autonomous rhythmic changes in intravesical pressure, termed bladder wall micromotion, is a phenomenon that has been linked to urinary urgency, the key symptom in overactive bladder (OAB). However, the mechanism through which micromotion drives urinary urgency is poorly understood. In addition, micromotion is inherently difficult to study in human urodynamics due to challenges distinguishing it from normal cyclic physiologic processes such as pulse rate, breathing, rectal contractions, and ureteral jetting.
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