John Allen

Summary

Affiliation: Freeman Hospital
Country: UK

Publications

  1. ncbi request reprint Thermography and colour duplex ultrasound assessments of arterio-venous fistula function in renal patients
    John Allen
    Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK
    Physiol Meas 27:51-60. 2006
  2. ncbi request reprint Photoplethysmography and its application in clinical physiological measurement
    John Allen
    Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne, UK
    Physiol Meas 28:R1-39. 2007
  3. doi request reprint A prospective comparison of bilateral photoplethysmography versus the ankle-brachial pressure index for detecting and quantifying lower limb peripheral arterial disease
    John Allen
    Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne, United Kingdom
    J Vasc Surg 47:794-802. 2008
  4. ncbi request reprint Finger microvascular responses to deep inspiratory gasp assessed and quantified using wavelet analysis
    John Allen
    Microvascular Diagnostics, Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne, NE7 7DN, UK
    Physiol Meas 34:769-79. 2013
  5. doi request reprint Laser Doppler assessment of dermal circulatory changes in people with coronary artery disease
    Sharad C Agarwal
    Department of Cardiology, Freeman Hospital, Newcastle upon Tyne, UK
    Microvasc Res 84:55-9. 2012
  6. doi request reprint Determination of aortic valve opening time and left ventricular peak filling rate from the peripheral pulse amplitude in patients with ectopic beats
    Dingchang Zheng
    Medical Physics Department, Newcastle University, Freeman Hospital, Newcastle upon Tyne, UK
    Physiol Meas 29:1411-9. 2008
  7. doi request reprint Microvascular optical assessment confirms the presence of peripheral autonomic dysfunction in primary biliary cirrhosis
    Sam Stevens
    Microvascular Diagnostics, Regional Medical Physics Department, Freeman Hospital, Newcastle University, Newcastle upon Tyne, UK
    Liver Int 29:1467-72. 2009
  8. doi request reprint Increased pulse wave velocity and blood pressure in children who have undergone cardiac transplantation
    Annette Klinge
    Department of Paediatric Cardiology, Freeman Hospital, Newcastle upon Tyne, UK
    J Heart Lung Transplant 28:21-5. 2009
  9. doi request reprint Chronic fatigue syndrome and impaired peripheral pulse characteristics on orthostasis--a new potential diagnostic biomarker
    John Allen
    Microvascular Diagnostics, Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK
    Physiol Meas 33:231-41. 2012
  10. ncbi request reprint Photoplethysmography detection of lower limb peripheral arterial occlusive disease: a comparison of pulse timing, amplitude and shape characteristics
    John Allen
    Regional Medical Physics Department Freeman Hospital, Newcastle upon Tyne, UK
    Physiol Meas 26:811-21. 2005

Collaborators

Detail Information

Publications19

  1. ncbi request reprint Thermography and colour duplex ultrasound assessments of arterio-venous fistula function in renal patients
    John 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...
  2. ncbi request reprint Photoplethysmography and its application in clinical physiological measurement
    John 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...
  3. doi request reprint A prospective comparison of bilateral photoplethysmography versus the ankle-brachial pressure index for detecting and quantifying lower limb peripheral arterial disease
    John 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...
  4. ncbi request reprint Finger microvascular responses to deep inspiratory gasp assessed and quantified using wavelet analysis
    John Allen
    Microvascular Diagnostics, Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne, NE7 7DN, UK
    Physiol Meas 34:769-79. 2013
    ..The response measures were repeatable. This pilot study has successfully shown the feasibility of using wavelet analysis to characterize the cardiovascular waveforms and quantify their changes with DIG. ..
  5. doi request reprint Laser Doppler assessment of dermal circulatory changes in people with coronary artery disease
    Sharad 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)...
  6. doi request reprint Determination of aortic valve opening time and left ventricular peak filling rate from the peripheral pulse amplitude in patients with ectopic beats
    Dingchang Zheng
    Medical Physics Department, Newcastle University, Freeman Hospital, Newcastle upon Tyne, UK
    Physiol Meas 29:1411-9. 2008
    ....
  7. doi request reprint Microvascular optical assessment confirms the presence of peripheral autonomic dysfunction in primary biliary cirrhosis
    Sam 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...
  8. doi request reprint Increased pulse wave velocity and blood pressure in children who have undergone cardiac transplantation
    Annette 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...
  9. doi request reprint Chronic fatigue syndrome and impaired peripheral pulse characteristics on orthostasis--a new potential diagnostic biomarker
    John 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...
  10. ncbi request reprint Photoplethysmography detection of lower limb peripheral arterial occlusive disease: a comparison of pulse timing, amplitude and shape characteristics
    John 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...
  11. doi request reprint Novel assessment of microvascular changes in idiopathic restless legs syndrome (Willis-Ekbom disease)
    Kirstie N Anderson
    Department of Neurology, Royal Victoria Infirmary, Newcastle upon Tyne, UK
    J Sleep Res 22:315-21. 2013
    ..The protocol also provides an experimental paradigm to test therapeutic interventions for the future...
  12. ncbi request reprint Microvascular blood flow and skin temperature changes in the fingers following a deep nspiratory gasp
    John 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...
  13. doi request reprint Comparative reproducibility of dermal microvascular blood flow changes in response to acetylcholine iontophoresis, hyperthermia and reactive hyperaemia
    Sharad 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...
  14. ncbi request reprint Characterization of the Korotkoff sounds using joint time-frequency analysis
    John 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...
  15. ncbi request reprint Age-related changes in the characteristics of the photoplethysmographic pulse shape at various body sites
    John 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...
  16. ncbi request reprint Non-invasive in vivo assessment of changes in peripheral arterial properties with estimation of arterial volume compliance
    Dingchang 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...
  17. ncbi request reprint Reduced heart rate variability and baroreflex sensitivity in primary biliary cirrhosis
    Julia 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...
  18. ncbi request reprint 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. 2006
    b>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 ..
  19. ncbi request reprint Autonomic function is impaired in elderly stroke survivors
    Andrew 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...