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The role of raphe and tractus solitarius neuronal structures in the modulation of respiratory pattern in rabbits

100%
Budzinska K., Romaniuk J. R.
Acta Neurobiologiae Experimentalis
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1995
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vol. 55
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issue 3
155-164
EN
We studied the effects of MNR stimulation on phrenic (Phr) electroneurogram and external intercoastal muscles (EI)electromiogram in spontaneously breathing rabbits.Additionally, experiments were performed before and after lignocaine blockade of nucleus tractus solitarii (NTS) to determine whether the information from MNR is transmitted via NTS neurones.The completness of the blockade of NTS region was checked by studying the Hering-Breuer reflex.Stimulation at the rostral part of this region produced inhibition of phasic inspiratory activity, whereas stimulation in the caudal part elicited tonic activity throughout the respiratory cycle.These effects were more pronounced on EI than on Phr.Responses to MNR stimulation were attenuated after lignocaine blockade, suggesting that the neurones located in NTS take part inthe transmission of the modulatory information from the MNR to respiratory motoneurones.
2
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The role of pulmonary stretch receptor activation during cough in dogs

81%
Romaniuk J. R., Kowalski K. E., Dick T. E.
Acta Neurobiologiae Experimentalis
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1997
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vol. 57
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issue 1
21-29
EN
The role of pulmonary stretch receptors in the modulation of expiratory muscle activity during cough is controversial. To evaluate their potential influence on expiratory effort during cough, we compared expiratory muscle activity during unobstructed cough to that during obstructed cough in which the trachea was occluded at the end inspiration and maintained throughout the subsequent expiration. Cough was evoked by mechanical stimulation of the intrathoracic trachea in 9 anesthetized, tracheotomized dogs. Peak triangularis sterni (TS), internal intercostal (IIC) and transversus abdominis (TA) muscle EMG were monitored to assess both rib cage and abdominal muscle activation during expiration. During cough, expiratory activity increased and peak activity shifted from Stage II to Stage I expiration. Peak expiratory muscle activation during unobstructed and occluded coughs were not significantly different. These data indicate that enhanced vagal stimulation resulting from airway occlusion does not affect expiratory activity during cough. We suggest that during cough, the expiratory muscles are activated in a stereotypical pattern by the neural network generating the cough and this pattern of activation is not affected by phasic vagal input. input.
3
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Respiratory response to stimulation of spinal or medullary locomotor structures in decerebrate cats

81%
Romaniuk J. R., Kasicki S., Kazennikov O., Selionov V. A.
Acta Neurobiologiae Experimentalis
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1994
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vol. 54
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issue 1
11-17
4
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Load compensatory response of external intercostal muscles during assisted ventilation in rabbits

81%
Romaniuk J. R., Celichowski J., Kowalski K.
Acta Neurobiologiae Experimentalis
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1993
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vol. 53
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issue 4
557-561
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