A previously validated computer model of the normal pulmonary circulation is adapted to simulate pulmonary arterial hypertension (PAH) in humans. Model predictions are used to explore the suitability of currently accepted criteria for diagnosing PAH by correlating hemodynamic data with the degree of vascular compromise (disease severity). Model predictions demonstrate a hyperbolic relationship between vascular compromise, mean pulmonary artery pressure (PAPm) and pulmonary vascular resistance (PVR). PAPm and PVR change very little from disease initiation until a vascular compromise of 65% to 70% (surface area of 0.35 to 0.3 of baseline, respectively) is reached. Following that, further compromise is associated with a steep rise in PAPm and PVR. The relationship between vascular compromise and hemodynamics may explain the relative stability of cardiac output early in this disease process and, therefore, the lack of symptoms. It also explains the rapid deterioration following diagnosis if the disease remains untreated. Model predictions demonstrate the inadequacy of the current hemodynamic criteria for diagnosing PAH over a wide range of left atrial pressure and cardiac output combinations and for early detection of disease. The model provides an alternative approach to diagnosing PAH by translating hemodynamic data to degree of vascular compromise.
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http://dx.doi.org/10.1155/2012/764545 | DOI Listing |
Ageing Res Rev
January 2025
Vascular Cognitive Impairment and Neurodegeneration Program, Dept. of Neurosurgery, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA; Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA; International Training Program in Geroscience, Doctoral College, Health Sciences Program/Institute of Preventive Medicine and Public Health, Semmelweis University, Budapest, Hungary; Department of Health Promotion Sciences, College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, OK. Electronic address:
Endothelial colony-forming cells (ECFCs), a unique endothelial progenitor subset, are essential for vascular integrity and repair, providing significant regenerative potential. Recent studies highlight their role in cerebrovascular aging, particularly in the pathogenesis of vascular cognitive impairment and dementia (VCID). Aging disrupts ECFC functionality through mechanisms such as oxidative stress, chronic inflammation, and cellular senescence, leading to compromised vascular repair and reduced neurovascular resilience.
View Article and Find Full Text PDFEnviron Pollut
January 2025
Heart Center and Beijing Key Laboratory of Hypertension, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China; Department of Cardiology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China. Electronic address:
Microplastics (MPs) have been found to interfere with the gut microbiota and compromise the integrity of the gut barrier. Excessive exposure to MPs markedly elevates the risk of cardiovascular disease, yet their influence on hypertension remains elusive, calling for investigation into their potential impacts on blood pressure (BP) regulation. In the present study, an increase in the concentration of MPs was observed in the fecal samples of individuals suffering from hypertension, as compared to the controls.
View Article and Find Full Text PDFJ Neurotrauma
January 2025
Department of Neurosurgery, the First Medical Centre, Chinese PLA General Hospital, Beijing, China.
Following traumatic brain injury (TBI), inhibition of the Na-K-Cl cotransporter1 (NKCC1) has been observed to alleviate damage to the blood-brain barrier (BBB). However, the underlying mechanism for this effect remains unclear. This study aimed to investigate the mechanisms by which inhibiting the NKCC1 attenuates disruption of BBB integrity in TBI.
View Article and Find Full Text PDFAust Crit Care
January 2025
School of Nursing, The University of Auckland, Auckland, New Zealand; Cardiothoracic and Vascular Intensive Care Unit, Te Whatu Ora Te Toka Tumai Auckland, Auckland, New Zealand. Electronic address:
Background: Clinical practice guidelines endorse family involvement in ward rounds to improve communication and engagement between patients, whānau (family), and healthcare teams, yet the practice has not been universally implemented. Whānau inclusion in adult bedside rounds is often met with hesitation by intensive care unit (ICU) healthcare clinicians, and reasons for this have not been explored in Aotearoa, New Zealand.
Objectives: The aim of this study was to assess attitudes and perceptions of ICU clinicians towards whānau-family inclusion in adult ICU ward rounds in Aotearoa New Zealand.
Eur J Surg Oncol
January 2025
Program in Peritoneal Surface Malignancy, Washington Cancer Institute, Washington, DC, USA. Electronic address:
Postoperative pancreatitis is an unusual complication of upper abdominal surgery that can result in severe morbidity and has been associated with postoperative death. It can be caused by trauma to the surface of the gland, injury to pancreatic ducts, vascular compromise, ductal obstruction within the pancreas parenchyma or because of duodenal stagnation. Our database of peritoneal surface malignancy patients was surveyed in a search for patients who manifested signs and symptoms of severe postoperative pancreatitis.
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