Research Topics
| John AllenSummaryAffiliation: Freeman Hospital Country: UK Publications
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Detail Information
Publications
Thermography and colour duplex ultrasound assessments of arterio-venous fistula function in renal patientsJohn Allen
Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK
Physiol Meas 27:51-60. 2006..In summary, we have now demonstrated the potential clinical value of medical infrared thermography for assessing AVF function in renal patients...- Photoplethysmography and its application in clinical physiological measurementJohn Allen
Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne, UK
Physiol Meas 28:R1-39. 2007..The review then focuses on the applications of PPG in clinical physiological measurements, including clinical physiological monitoring, vascular assessment and autonomic function... 
A prospective comparison of bilateral photoplethysmography versus the ankle-brachial pressure index for detecting and quantifying lower limb peripheral arterial diseaseJohn Allen
Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne, United Kingdom
J Vasc Surg 47:794-802. 2008..This study prospectively assessed the diagnostic accuracy of a novel bilateral photoplethysmography toe pulse measurement technique for the detection of significant lower limb peripheral arterial disease...- Laser Doppler assessment of dermal circulatory changes in people with coronary artery diseaseSharad C Agarwal
Department of Cardiology, Freeman Hospital, Newcastle upon Tyne, UK
Microvasc Res 84:55-9. 2012..We studied and compared microcirculatory changes in response to acetylcholine iontophoresis (ACh), local heating of the skin and reactive hyperaemia in patients with coronary artery disease (CAD)... - Determination of aortic valve opening time and left ventricular peak filling rate from the peripheral pulse amplitude in patients with ectopic beatsDingchang Zheng
Medical Physics Department, Newcastle University, Freeman Hospital, Newcastle upon Tyne, UK
Physiol Meas 29:1411-9. 2008.... - Microvascular optical assessment confirms the presence of peripheral autonomic dysfunction in primary biliary cirrhosisSam Stevens
Microvascular Diagnostics, Regional Medical Physics Department, Freeman Hospital, Newcastle University, Newcastle upon Tyne, UK
Liver Int 29:1467-72. 2009..Currently, AD in PBC is considered to be central in origin. The aim of this study was to examine peripheral mechanisms in the pathogenesis of AD in PBC using novel microvascular optical assessments for this patient group... - Increased pulse wave velocity and blood pressure in children who have undergone cardiac transplantationAnnette Klinge
Department of Paediatric Cardiology, Freeman Hospital, Newcastle upon Tyne, UK
J Heart Lung Transplant 28:21-5. 2009..Arterial stiffness is associated with cardiovascular risk in adults. Pulse wave velocity (PWV) may be used as a surrogate for arterial rigidity. In this study we investigate PWV in children after cardiac transplantation... - Photoplethysmography detection of lower limb peripheral arterial occlusive disease: a comparison of pulse timing, amplitude and shape characteristicsJohn Allen
Regional Medical Physics Department Freeman Hospital, Newcastle upon Tyne, UK
Physiol Meas 26:811-21. 2005..The low-cost and simplicity of this optical-based technology could offer significant benefits to healthcare, such as in primary care where non-invasive, accurate and simple-to-use (de-skilled) diagnostic techniques are desirable... - Chronic fatigue syndrome and impaired peripheral pulse characteristics on orthostasis--a new potential diagnostic biomarkerJohn Allen
Microvascular Diagnostics, Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK
Physiol Meas 33:231-41. 2012..Pulse wave abnormalities have been observed in CFS and represent a potential objective measure to help differentiate between CFS patients and healthy controls... - Comparative reproducibility of dermal microvascular blood flow changes in response to acetylcholine iontophoresis, hyperthermia and reactive hyperaemiaSharad C Agarwal
Departments of Cardiology, Freeman Hospital, Newcastle upon Tyne NE77DN, UK
Physiol Meas 31:1-11. 2010..Relative change in perfusion had relatively poor reproducibility. The change in perfusion and time-to-peak perfusion for local skin heating were the most reproducible overall... - Age-related changes in the characteristics of the photoplethysmographic pulse shape at various body sitesJohn Allen
Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK
Physiol Meas 24:297-307. 2003..Age-matched normal ranges must be considered when evaluating pulses from patients with possible vascular disease... - Non-invasive in vivo assessment of changes in peripheral arterial properties with estimation of arterial volume complianceDingchang Zheng
Cardiovascular Physics and Engineering Research Group, Medical Physics Department, Newcastle University, Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK
Physiol Meas 28:1317-27. 2007..In conclusion, we have demonstrated that dynamic changes in arterial characteristics can be detected at a beat-to-beat level by the measurement of the arm pulse propagation time... - Characterization of the Korotkoff sounds using joint time-frequency analysisJohn Allen
Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK
Physiol Meas 25:107-17. 2004..Ultimately, exploiting the joint time and frequency characteristics of the sounds may improve blood pressure measurement and help to assess the stiffness of the peripheral arteries... - Reduced heart rate variability and baroreflex sensitivity in primary biliary cirrhosisJulia L Newton
Cardiovascular Investigation Unit, School of Clinical Medical Sciences, University of Newcastle, Newcastle upon Tyne, UK
Liver Int 26:197-202. 2006..We have assessed heart rate variability (HRV) and baroreflex sensitivity (BRS) risk factors associated with cardiovascular mortality, in 57 PBC patients and age- and sex-matched normal controls... - Microvascular blood flow and skin temperature changes in the fingers following a deep nspiratory gaspJohn Allen
Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne, UK
Physiol Meas 23:365-73. 2002..001) and skin temperature and PPG of 23.5 s (P < 0.001). The vascular responses of skin temperature, LDF and PPG to an inspiratory gasp were repeatable, with temperature change repeatable to within 10% of the median subject change... - Renal diseases in John Allen's 'Synopsis Universae Medicinae Practicae...'Antonio Mezzogiorno
Human Anatomy Unit, Department of Public Health, Faculty of Medicine and Surgery, Second University of Naples, Naples, Italy
J Nephrol 19:S98-101. 2006b>John Allen, a British physician of the eighteenth century, deserves being remembered for a series of inventions, but most importantly -- from a 'medical' point of view -- for his highly praised manuscript, the 'Universae Medicinae .. - Autonomic function is impaired in elderly stroke survivorsAndrew McLaren
Institute for Ageing and Health, Newcastle General Hospital, Westgate Road, Newcastle upon Tyne NE4 6BE
Stroke 36:1026-30. 2005..We sought to determine if autonomic function is impaired after stroke recovery in older patients...