Recording of bioelectrical activity changes in sheep cerebral cortex

Cwynar, Przemysław; Zawadzki, Wojciech

doi:10.4067/s0301-732x2010000200006

Cited by 5 publications

(5 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the presented results of our experiments were based on the same practice. It was found that there are both beta waves, confirmed earlier by Cwynar and Zawadzki (2010), and also intermittent theta and delta rhythms. Pellegrino and Sica (2004) believe that dogs under sedation, without access to visual stimuli, may be characterised by the appearance of alpha waves, thus having lower values of neural voltage potentials, as well as lower frequencies.…”

Section: Eeg Interpretationsupporting

confidence: 54%

“…Yoshida et al (2004) discussed these kinds of inventions and recommended that great attention should be paid towards the interpretation of animal experimental methods. Even so, most authors try to maintain the current convention in wave classification in frequency bands regardless of the EEG wave recording methods (Cwynar and Zawadzki 2010). It was also noted that during the EEG recording in dogs the interpretation and classification of rhythms were made according to the criteria of human medicine, as in the study by Pellegrino and Sica (2004) and Brauer et al (2011).…”

Section: Eeg Interpretationmentioning

confidence: 99%

See 1 more Smart Citation

Electroencephalographic recordings of physiological activity of the sheep cerebral cortex

Cwynar¹,

Kołacz²,

Walerjan³

2014

Polish Journal of Veterinary Sciences

View full text Add to dashboard Cite

This paper presents the physiological activity of the cerebral cortex in sheep in electroencephalographic findings. The study was performed to evaluate and improve understanding of brain monitoring methods in freely moving animals without the use of any anaesthetic methods during the acquisition stage. The aim of the study was to determine the physiological activity of the cerebral cortex in animals in a sheep model (using clinically healthy Polish Merino rams, aged 1 yr.) to determine its clinical EEG protocol. The EEG was registered using an in-lab EEG device as well as ambulatory systems (Holter EEG). The bioelectrical activity of the sheep cerebral cortex was recorded using gold disc and needle electrodes placed on experimentally determined locations on the scalp. The main finding of this study was the rhythmic EEG activity of the sheep brain in wakeful and conscious states (eyes open). The rhythm was bilaterally synchronous and determined a basic pattern in the registration of physiological activity of the cerebral cortex. The acquired rhythm may correspond to the theta rhythm in humans, which is a normal activity controlled by the hippocampus. This background activity comprised intermittent episodic slow waves and synchronous beta waves.

show abstract

Section: Eeg Interpretationsupporting

confidence: 54%

Section: Eeg Interpretationmentioning

confidence: 99%

Electroencephalographic recordings of physiological activity of the sheep cerebral cortex

Cwynar¹,

Kołacz²,

Walerjan³

2014

Polish Journal of Veterinary Sciences

View full text Add to dashboard Cite

show abstract

“…However, in case 1, the voltage was significantly higher (median: 45 µV) than in cases 2 and 4. Also in literature, two studies reported lower voltage values in healthy sheep (Cwynar and Zawadzki 2010;Cwynar et al 2014). Moreover, as reported by Cwynar et al (2014), in case 2, the EEG activity varied depending on the area of the skull in which it was recorded: the beta rhythm had a greater expression in the posterior area while the delta rhythm had a greater expression in the most cranial zones.…”

Section: Discussionmentioning

confidence: 60%

“…Channels located near the temporal line also detected delta wave activity and the activity recorded near the occipital lobes was characterised by a beta rhythm (Cwynar et al 2014). In Polish Merino sheep aged 3-4 years, the EEG were characterised by a beta rhythm with a mean voltage value of 26.5 µV (Cwynar and Zawadzki 2010). There are two mechanisms producing EEG abnormalities in the hydrocephalus: the https://doi.org/10.17221/8/2021-VETMED increased intracranial pressure that induces disturbances in the blood supply -either generally or focally -and cerebral oedema, and degenerative brain lesions secondary to the chronic increase of the intracranial pressure (Klemm and Hall 1971;Redding and Knecht 1984;Armasu et al 2014).…”

Section: Discussionmentioning

confidence: 97%

Congenital hydrocephalus in three sheep: Clinical, electroencephalographic and pathological features

Masucci¹,

Capucchio²,

Buttitta³

et al. 2022

Vet. Med. - Czech

View full text Add to dashboard Cite

The clinical, electroencephalographic and neuro-pathological features of three cases (cases 1, 2 and 3) of congenital hydrocephalus in sheep were described. The observed neurological signs reflected damage in the telencephalon and brain stem. The electroencephalogram performed in case 1 and case 2 showed different patterns: symmetric and synchronous high-voltage slow-activity in case 1, and low-voltage slow-activity in case 2. By the post-mortem examination, in all the animals, dilatation of the ventricular system, especially of the lateral ventricles, associated with a glial reaction surrounding the dilated ventricles was observed. Only in case 3, a monolateral meningeal thickening at the left cerebellopontine angle seemed to be responsible for the obstructive hydrocephalus. In the other two brains (case 1 and 2), no potential anatomical cause for the hydrocephalus were detected, even if, in case 2, a compensatory form was not excluded due to the moderate hypoplasia of the cerebrum and the presence of the non-suppurative inflammation. The results of this work provide a contribution to the EEG characterisation in ovine hydrocephalus cases; nevertheless further multidisciplinary studies of a larger number of sheep could permit to better characterise the EEG pattern in ovine hydrocephalus cases.

show abstract

“…In general, sedation may be used alone or in combination with a general anesthetic and as a premedication in anesthesia induction [7] [8]. Electroencephalogram record electrical activity from the scalp surface using conduction media of metal electrode [9]. EEG waves are distinguished by frequency, amplitude and morphology [3].…”

Section: Resultsmentioning

confidence: 99%

Electroencephalogram recording in Garut sheep: effect of the use of xylazine in small ruminants

Vidiastuti¹,

Soehartono²,

Novianto³

2018

Proceedings of the 1st International Conference in One Health (ICOH 2017)

View full text Add to dashboard Cite

Minor procedures which are not painfull but require the animal to be relatively immobile may be performed with the aid of a sedative. In practical terms, sedative agent cause some degree of drowsiness until lost of consciousness. Xylazine used as a sedative and anaesthetic induction by inhibiting the release of norepinephrine in the brain, especially the locus coeruleus. Electroencephalogram (EEG) isa non-invassive procedureto record electrical activity from the scalp surface conduction media using metal electrodes. Garut sheep is an germ plasm asset of West Java and have a good potential to be developed as a source of meat, fighting sheep and laboratory animal in Indonesia. The aim of this study was to determine the condition of the brain electrical activity of Garut sheep by xylazine. Four healthy female Garut sheeps, age of 1-2 years old, 25-35kg body weight were used in this studies. They received xylazine bolus injection with a dose of 0.1 mg/kg body weight. Recording of the brain's electrical conduction was done using EEG. The placement of the electrodes on the head of sheep was performed at the point FP 1 -F 7 and FP 2 -F 2 . Monitoring was conducted before induced and recording was done continuously starting before, during and after the induction of xylazine. Recorded data was collected for 60 minutes. The results showed that 15 minutes before injection brain waves presented gamma waves (30-70 Hz).However, one minutes after injection turned into beta waves (13-30 Hz) with a sharp wave morphology. Then 45 minutes later it entered the recovery phase, where the brain waves returned back to the gamma waves. These effect might occur that xylazine affect α2 receptors in locus coeruleus and it is involved the regulation of sleep or wakefulness.

show abstract

Recording of bioelectrical activity changes in sheep cerebral cortex

Cited by 5 publications

References 58 publications

Electroencephalographic recordings of physiological activity of the sheep cerebral cortex

Electroencephalographic recordings of physiological activity of the sheep cerebral cortex

Congenital hydrocephalus in three sheep: Clinical, electroencephalographic and pathological features

Electroencephalogram recording in Garut sheep: effect of the use of xylazine in small ruminants

Contact Info

Product

Resources

About