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Development of short-term potentiation (STP) of respiration, which leads to the respiratory 'afterdischarge', was studied in anesthetized, paralyzed, vagotomized and glomectomized cats. Phrenic nerve activity was used as an index of respiratory output. Respiratory output was increased and the potentiating mechanism activated by electrical stimulation of a(More)
We recorded phrenic nerve activity and thalamic single unit firing in unanesthetized, suprathalamically decerebrated, paralyzed and ventilated cats, in which vagi and carotid sinus nerves (CSN) had been ablated. Seventy-six (14%) of 545 neurons in regions of the thalamus related to the ascending reticular system, which had been tonically firing at low(More)
1. We recorded phrenic nerve activities and single unit firing of mesencephalic neurones in unanaesthetized supracollicularly decerebrated, paralysed and ventilated cats, in which vagi and carotid sinus nerves had been ablated. We made these measurements first at low levels of respiratory drive associated with normal PCO2 levels, then with increased(More)
BACKGROUND Plasma exchange is the main therapy for thrombotic thrombocytopenic purpura (TTP). No treatments other than plasma exchange have been documented to be effective nor are approved for treatment of TTP. The anti-von Willebrand factor (VWF) aptamer ARC1779 effectively inhibits VWF activity in plasma samples of TTP patients and thus shear-dependent(More)
BACKGROUND In thrombotic thrombocytopenic purpura (TTP), ultralarge von Willebrand factor (VWF) multimers bind platelet (PLT) glycoprotein Ib and lead to the formation of disseminated fibrin-poor, VWF-rich PLT thrombi. The aptamer ARC1779 blocks binding of the VWF A1 domain to PLT glycoprotein Ib. We evaluated whether ARC1779 inhibits the excessive VWF(More)
We studied the effect of changing drive on resetting of respiratory rhythm in anesthetized cats and in a model (Van der Pol) of a limit-cycle oscillator. In cats, rhythm was perturbed by brief mesencephalic stimuli. Stimulus time in the cycle (old phases) and times of onset of rescheduled breaths (cophases) were measured. Previous study [Paydarfar and(More)
ARC1779 is an aptamer, which blocks binding of the von Willebrand Factor (VWF) A1 domain to platelet GPIb receptors. VWF is increased in the elderly an in the setting of acute myocardial infarction (AMI), as reflected by increased shear-dependent platelet function. We hypothesized that ARC1779 concentration-dependently inhibits ex vivo platelet function,(More)
We studied the effects on breathing of seizures induced by focal injection of penicillin G into the parietal cortex in 13 anesthetized cats. Electrocorticograms, ventilation, end-tidal PCO2, and intrapleural and arterial pressures were monitored; changes of these variables were related to the stages of motor seizure. The first respiratory responses,(More)
Seizure activity can lead to profound respiratory stimulation in spontaneously breathing animals with intact respiratory feedback mechanisms (Paydarfar et al., Am. J. Physiol. 260, R934, 1991). The present study was designed to test the hypothesis that peripheral respiratory feedback mechanisms are not important for the genesis of seizure-induced hyperpnea.(More)
The recently released drug buspirone is an anxiolytic agent that appears not to have the sedating effects of barbiturates and benzodiazepines, both known to have respiratory depressant effects. Because of its increasing clinical use, we desired to study the effects of buspirone on respiratory control. We therefore determined central neural respiratory(More)