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Physiological Reports, Volume 14, Issue 20, October 2026.Abstract Homeostasis is often taught as steady‐state regulation keeping internal variables within narrow limits—reflecting a mammalian bias. Yet, canonical homeostasis is far from universal. In many animals, including humans, normal physiological states allow some variables to fluctuate cyclically or stochastically while others remain tightly ...
Warren Burggren, Tobis Wang
wiley +1 more source
Pulmonary artery pulsatility index: physiological basis and clinical application
European Journal of Heart Failure, 2020 Pulmonary artery pulsatility index (PAPi) is a haemodynamic parameter that is derived from right atrial and pulmonary artery pulse pressures. A number of reports have described the prognostic value of PAPi in patients with advanced heart failure and ...
Finn Gustafsson
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Homocysteine and Pulsatility Index of Cerebral Arteries [PDF]
Stroke, 2009 Background and Purpose— A pulsatility index (PI) represents vascular resistance distal to an examined artery. The purpose of the present study was to evaluate an association between plasma total homocysteine (tHcy) and PIs of the cerebral arteries in patients with ischemic stroke.
Seul-Ki Jeong
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Acta Obstetricia Et Gynecologica Scandinavica, 2017 Introduction: The pulsatility indices of the umbilical and uterine arteries are used as the surrogate measures of utero-placental perfusion. Combining the two might simplify the evaluation of total placental vascular impedance, possibly improve ...
Saemundur Gudmundsson +2 more
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Use of Pulmonary Artery Pulsatility Index in Cardiac Surgery
Journal of Cardiothoracic and Vascular Anesthesia, 2020This study evaluated whether the pulmonary artery pulsatility index (PAPi) collected before and after cardiopulmonary bypass (CPB) is predictive and diagnostic of new onset right ventricular (RV) failure in the elective cardiac surgical population.This was a prospective observational study of patients who underwent cardiac surgery between 2017 and 2019.
Mario Gaudino +2 more
exaly +3 more sources
Pediatrics, 1983
To the Editor.— The determination of cerebral blood velocity in the newborn infant using transfontanel Doppler ultrasound has been discussed in detail in two recent commentaries.1,2 Whereas the use of the Doppler effect to determine blood velocity is well accepted, it is apparent that considerable controversy exists regarding the ability
D G, Batton, J, Hellmann, M J, Maisels
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To the Editor.— The determination of cerebral blood velocity in the newborn infant using transfontanel Doppler ultrasound has been discussed in detail in two recent commentaries.1,2 Whereas the use of the Doppler effect to determine blood velocity is well accepted, it is apparent that considerable controversy exists regarding the ability
D G, Batton, J, Hellmann, M J, Maisels
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Gosling’s Doppler Pulsatility Index Revisited
Ultrasound in Medicine & Biology, 1998In Doppler sonography, the physiological meaning of Gosling's pulsatility index (PI) as a measure of downstream resistance is still under dispute. We deliver the theoretical derivation of its physiological significance. We present a mathematical model based on the linked theories of critical closing pressure (CCP) and cerebrovascular impedance ...
E, Michel, B, Zernikow
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Homocysteine and pulsatility index in lacunar infarction
Clinical Neurology and Neurosurgery, 2011To evaluate an association between plasma concentration of total homocysteine (tHcy) and pulsatility indexes (PIs) of cerebral arteries in patients with lacunar infarction (LI), comparing control subjects.Consecutive patients referred to a neurovascular ultrasound laboratory were evaluated from March 2007 to February 2008.
Seul-Ki, Jeong +2 more
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Real-time calculation of ultrasonic pulsatility index
Medical & Biological Engineering & Computing, 1981One of the disadvantages of indices derived from ultrasonic Doppler signals is that they are not normally available instantaneously. In an attempt to overcome this problem, a real-time spectrum analyser has been interfaced to an Intel 8085 microprocessor system and programmed to calculate pulsatility index in real time.
D T, Gibbons +3 more
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Peak Systolic Velocity, Resistance Index and Pulsatility Index
Acta Radiologica, 1997Purpose: To study variation in the process of measuring Doppler ultrasound (US) wave forms. Material and Methods: Eleven radiologists measured peak systolic velocity (PSV), resistance index (RI), and pulsatility index (PI) from a pre-recorded videotape. The wave forms were taken from the carotid, brachiàl, celiac, and renal interlobar
Raija Mikkonen +2 more
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