Irene Farquhar

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A comparison of the cardiac responses to a variety of maneuvers that modify cardiac vagal tone was made in nondiabetic and diabetic subjects. We concluded that assessment of heart rate variability by reference to standard deviation of R-R intervals is unhelpful; that a single deep breath is a more potent stimulus for heart rate change than repeated deep(More)
Continuous noninvasive blood pressure measurement is of great potential use in the critically ill. This study was designed to find out whether measurements of blood pressure by a Finapres accurately represented intra-arterial pressure. Comparisons were made between readings from a radial artery line and from a Finapres finger cuff in 10 critically ill(More)
  • I Farquhar
  • JPEN. Journal of parenteral and enteral nutrition
  • 1987
Total parenteral nutrition lines are commonly tunneled subcutaneously to decrease rates of sepsis. The history of line tunneling is discussed briefly, noting that to date a surgical approach, a detachable hub catheter or more recently a tunneling rod and 'peel away' introducer have been necessary for this form of central venous access. These systems have(More)
1. Cardiovascular responses to three different interventions, namely the Valsalva manoeuvre, deep breathing and a cold stimulus on the face, were studied in two ethnic groups (European and Bangladeshi) that have been shown to differ in the prevalence of hypertensive-vascular disease. The data obtained consisted of systolic blood pressure, diastolic blood(More)
The loss of somatosensory evoked potentials (SSEP's) was investigated in a feline model of intracranial hypertension. Threshold values of cerebral perfusion pressure (CPP) and cerebral blood flow (CBF) required for maintenance of SSEP's are defined using a mathematical model. The model describes loss of amplitude of SSEP's using the form of a dose-response(More)
A flowmeter is described which may be used to measure gas flow in experimental situations. It may be adapted for use with any gas or gas mixture and be used to provide flows as small as 50 ml min-1. A mercury-in-glass manometer (sphygmomanometer) is used to measure the gas pressure proximal to a flow restrictor (consisting of a hypodermic needle hub) and it(More)