Catherine Birk

Learn More
We recently showed that a single low graft blood-flow measurement (Qa) does not accurately predict graft thrombosis. In this study, we prospectively determined whether percentage of decrease in Qa (DeltaQa) or adjustment of Qa for mean arterial pressure (Qa/MAP; Delta(Qa/MAP)) provides greater predictive accuracy than a single Qa. We monitored 83 grafts(More)
A number of studies have reported that a single low blood flow (Qa) measurement in synthetic hemodialysis grafts predicts thrombosis or failure. In a meta-analysis of these studies, we computed receiver operating characteristic (ROC) curves that evaluated the predictive accuracy of a Qa measurement. The ROC curves plotted sensitivity versus false-positive(More)
For Articles reporting original data (Article; Brief Reports;<lb>Prosthetics, Orthotics, Devices; Clinical Management Re-<lb>views; Clinical Implications of Basic Research) and Review<lb>Articles (including Meta-Analyses), see the Instructions for<lb>Structured Abstracts. For other manuscripts (eg, Clinical<lb>Notes, Commentaries, Special Communications),(More)
We have previously shown that graft blood flow (Qa) has a poor accuracy in predicting graft thrombosis. In this study, we determined whether hemodynamic variation helps explain this poor predictive accuracy. We also determined whether standardized timing of Qa measurements, which is widely recommended, will promote measurement reproducibility. We analyzed(More)
OBJECTIVE To propose a new model of integrated, multidisciplinary postoperative care of the patients with deep brain stimulation (DBS). DESIGN Observational cohort study with follow-up at 3 months and 1 year. SETTING Academic medical center movement disorder clinic. PARTICIPANTS Seventy-three consecutive patients with medically refractory Parkinson's(More)
BACKGROUND The purpose of this study was to determine whether the focused delivery of heparin or recombinant tissue plasminogen activator (rtPA) by rinsing accords protective effects which increases the survival of free groin flaps following fatal secondary venous stasis. METHODS Free microvascular groin flaps (n = 40) were transplanted to the necks of(More)
BACKGROUND There is wide disagreement among studies that have evaluated the accuracy of urea recirculation (UR) in detecting vascular access stenosis. The 3-site method (UR3) has been discredited and replaced by the 2-site method (UR2), but few studies have evaluated UR2. METHODS We compared the accuracies of UR2 and UR3 in detecting stenosis in 59(More)
  • 1