Intracranial variables in propofol or sevoflurane-anesthestized dogs subjected to subarachnoid administration of iohexol

Nunes, Newton; Leite, Alessandra Valeiro; Paula, Danielli Parrilha de; Nishimori, Celina Tie; Souza, Almir Pereira de; Santos, Paulo Sérgio Patto dos; Guerrero, Piedad Natalia Henao; Lopes, P.C.F.

doi:10.1590/s0102-09352011000600006

Cited by 2 publications

(1 citation statement)

References 30 publications

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“…Thus, CSF production occurs at a slower rate, and there is probably no time to replace what was collected until the contrast injection, resulting in lower ICP elevation (Löfgren & Zwetnow 1973). In a study in dogs, CSF was collected before the injection of iohexol contrast, resulting in decreased ICP (Nunes et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Non-invasive monitoring of intracranial pressure waveforms using Braincare® BCMM 2000 monitor in dogs with myelopathies undergoing myelography

et al. 2023

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Intracranial pressure (ICP) monitoring is considered the gold standard for optimizing the treatment of humans in intensive care units. However, this procedure is not commonly performed in veterinary medicine because of the limitations and complications of the method. There are some new promising non-invasive techniques for monitoring ICP, but they have not been validated in veterinary medicine. This study aimed to correlate the non-invasive intracranial pressure (NI-ICP) waveforms obtained with the BCMM-2000 Brain4care monitor during myelography in dogs with myelopathies undergoing this exam for diagnostic purposes with the waveforms obtained through invasive monitoring of the subarachnoid pressure (SP). The NI-ICP waveform was monitored in six dogs with myelopathies before (M1), during (M2), and after (M3) contrast medium injection into the subarachnoid space. Cerebrospinal fluid (CSF) was collected before contrast injection. The SP waveform was simultaneously monitored in three of the six dogs. Correlations between the two methods were performed using Pearson’s coefficient. The analysis of the morphology and amplitude of the waves at each moment was performed, and at M2, an increase in the P2:P1 ratio (p<0.05) was observed in both monitoring methods. In M3, the values were similar to those of M1, demonstrating the return of cerebral compliance. The comparison of the NI-ICP and SP had a positive correlation in those moments (Pearson’s coefficient r=0.76; p=0.027). The speed of contrast administration, degree of spinal cord compression, and volume of CSF previously collected may affect P2:P1 and ICP dynamics. The BCMM-2000 Brain4care monitor was effective in detecting changes in ICP dynamics and abnormal pulse waveforms in dogs with meningoencephalitis of unknown origin, vertebral neoplasm and intervertebral disc disease with and without hemorrhagic myelomalacia, suggesting increased ICP induced by myelography.

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Section: Discussionmentioning

confidence: 99%

Non-invasive monitoring of intracranial pressure waveforms using Braincare® BCMM 2000 monitor in dogs with myelopathies undergoing myelography

et al. 2023

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Two levels of the inspired oxygen fraction in propofol-anesthetized dogs with high intracranial pressure: cardiopulmonary function

Lopes¹,

Nunes²,

Belmonte³

et al. 2014

Arq. Bras. Med. Vet. Zootec.

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In the initial stage of traumatic brain injury, the use of 1.0 inspired oxygen fraction (FiO 2 ) is indicated. However, high FiO 2 has been correlated with atelectasis. Thus, the effects of FiO 2 = 1.0 and FiO 2 = 0.6 on the cardiopulmonary function in propofol-anesthetized dogs with high intracranial pressure (ICP) were evaluated. Eight dogs were anesthetized on two occasions, receiving, during controlled ventilation, an FiO 2 = 1 (G100) or an FiO 2 = 0.6 (G60). Propofol was used for induction (10mg.kg -1 ) followed by a continuous rate infusion (0.6mg.kg -1 .minute -1 ). An increase in the ICP was induced by temporary obliteration of the right jugular vein (OJ v ) 50 minutes after induction of anesthesia. The measurement was taken twenty minutes after OJ v (T0) and then at 15-minute intervals (T15 to T60). Alveolar oxygen partial pressure in G60 was lower than in G100 during the whole procedure. Alveolar-arterial oxygen gradient in G100 was greater than in G60 at T0 and at T60. No differences were observed for arterial oxygen partial pressure/inspired oxygen fraction ratio, arterial-to-alveolar oxygen pressure ratio, respiratory index, venous admixture, oxygen delivery, oxygen consumption, oxygen extraction, heart rate, mean pulmonary arterial pressure, pulmonary arterial occlusion pressure, cardiac index, stroke index and systemic vascular resistance index. In G100, mean arterial pressure at T0 was higher than at T45. In dogs with high ICP, the cardiopulmonary function was not influenced by the different FiO 2 used.Keywords: dog, total intravenous anesthesia, cerebral autoregulation, hemodynamic, venous admixture RESUMO No estágio inicial do trauma encefálico, o emprego de fração inspirada de oxigênio (FiO

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Intracranial variables in propofol or sevoflurane-anesthestized dogs subjected to subarachnoid administration of iohexol

Cited by 2 publications

References 30 publications

Non-invasive monitoring of intracranial pressure waveforms using Braincare® BCMM 2000 monitor in dogs with myelopathies undergoing myelography

Non-invasive monitoring of intracranial pressure waveforms using Braincare® BCMM 2000 monitor in dogs with myelopathies undergoing myelography

Two levels of the inspired oxygen fraction in propofol-anesthetized dogs with high intracranial pressure: cardiopulmonary function

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