Ricardo Miyasaka de Almeida

• PhD
• Professor (Full) at University of Brasília

Restraint and threat of predation are possibly the most stressful events in wild animals' lives. Management techniques should, therefore, be improved to avoid or minimize suffering in such situations. Body mass and variation in behavior influence the techniques used during containment. Automatic traps are mostly used for small primates living in th...

Background: Anaerobic cellular metabolism causes a series of structural and physiologic changes during storage that could compromise post-transfusion viability, reducing the safety of using blood stored for an extended period. Objective: We aimed to follow the biochemical and hematologic alterations of equine blood stored in plastic bags contain...

RESUMO No Brasil, Mangalarga Marchador é a raça com o maior número de equinos registrados, um total de 600.000 animais. Devido à falta de estudos termográficos, este estudo buscou avaliar alterações superficiais de temperatura corporal de membros torácicos e pélvicos após o esforço de marcha, usando uma câmera termográfica com infravermelho. O estu...

This study aimed to evaluate femoral nerve latency time recorded from both vastus lateralis and vastus medialis muscles, in clinically healthy dogs. Eighteen adult dogs were distributed into 2 distinct body mass ranges (Group 1: 1-4.1 kg, n= 9; Group 2: 4.2-13 kg, n= 8), according to the median body mass (4.1 kg). Distal motor latencies for the fem...

The aim of this study was to determine the minimum anesthetic concentration (MAC) of isoflurane, and to investigate if tramadol changes the isoflurane MAC in white-eyed parakeets (Psittacara leucophthalmus). Ten adult birds weighing 157 ± 9 g were anesthetized with isoflurane in oxygen under mechanical ventilation. Isoflurane concentration for the...

Objective: To investigate the efficacy of a new intravenous (IV) nanoemulsified isoflurane formulation for maintenance of general anesthesia in dogs. Study design: Prospective, crossover, experimental study. Animals: Seven healthy, mature, mixed-breed dogs, three male and four female, weighing 11.5 ± 1.5 kg. Methods: Anesthesia was induced w...

Background: Brachycephalic syndrome is characterized by increased airflow resistance in upper airways due to the combinations of anatomical deformities such as stenotic nares, elongated soft palate, everted laryngeal saccules, and tracheal hypoplasia. There is little information in recent literature about assessment of anatomical, cardiovascular, a...

Sheep herds, especially Santa Ines breed, have grown in the Brazilian Midwest in recent years. Therefore, clinical cases have also grown, and along came the need of conducting major surgeries without pain associated with the use of inhalational anesthesia. This study evaluated the cardiopulmonary and blood gas parameters in sheep under inhalational...

The carotid artery transposition may be used in research when continuous measurements of arterial pressure or serial blood sampling are needed. In sheep, this procedure has usually been performed under inhalational or barbiturate anesthesia; however, these anesthetic techniques may cause cardiorespiratory depression and delayed recovery. Conversely...

The use of human equipment in veterinary medicine is very common; therefore, it is essential that it is tested and validated. In this study, a comparison was made between blood levels of glucose, lactate, triglycerides, and cholesterol obtained by the portable device Accutrend® Plus and those found in laboratory methods considered standard for the...

In the initial stage of traumatic brain injury, the use of 1.0 inspired oxygen fraction (FiO2) is indicated. However, high FiO2 has been correlated with atelectasis. Thus, the effects of FiO2 = 1.0 and FiO2 = 0.6 on the cardiopulmonary function in propofol-anesthetized dogs with high intracranial pressure (ICP) were evaluated. Eight dogs were anest...

Prepulse inhibition (PPI) is the decrease of startle reflex amplitude when a slight stimulus is previously generated. This paradigm may provide valuable information about sensorimotor gating functionality. Here we aimed at determining the inhibited and uninhibited startle response of capuchin monkeys (Sapajus spp.), and to evaluate the role of the...

Chondrocytes obtained from stifle joint of New Zealand White rabbits were cultivated. Half of cells were maintained in culture for later implantation and the others frozen during six months to evaluate viability. A circular osteochondral defect was created in the right stifle of other twenty seven rabbits. The control group (CG) received no treatme...

This study aimed to evaluate the post operative analgesic effects of morphine or ketamine alone or their combination in 24 healthy bitches, weighing 11.01±8.69kg and aging 27±17 months, submitted to elective ovariohysterectomy. The animals were distributed to one of the three treatments after the anaesthetic induction: morphine (GM, n=8, 0.5mg kg-1...

The effects of inspired oxygen fractions (FiO 2) of 1 and 0.6 on bispectral index (BIS) in dogs with high intracranial pressure, submitted to a continuous rate infusion of propofol 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 f...

In large animal research, when frequent sampling of arterial blood is needed, the carotid artery transposition is the most used technique. The objective of this paper is to describe a new technique for carotid artery transposition in sheep and evaluate its effectiveness using the echo-Doppler ultrasound. The animals enrolled in this study had their...

To evaluate and compare the postoperative analgesia provided by epidural lidocaine, lidocaine/morphine or lidocaine/tramadol in dogs following elective orchiectomy. Prospective experimental trial. Thirty-six mongrel dogs aged 2-8 years old, weighing 6.6-22 kg. The dogs received 6.0 mg kg(-1) of lidocaine combined with 1.0 mg kg(-1) of tramadol, 0.1...

To report on the use of a new ventriculoperitoneal shunt (VPS) valve system utilized in a dog with hydrocephalus and to describe the clinical course over 20 months after implantation. A 3-month-old female Lhasa Apso dog was presented with lateral strabismus, domed calvarium, and visual deficits. A lateral skull radiograph revealed a persistent font...

To evaluate the quality of brachial plexus blockade with 0.75% ropivacaine in domestic chickens. Prospective experimental trial. Six 30-week-old female chickens, weighing 4.5 +/- 0.4 kg. Six brachial plexus injections were performed after anesthetic induction with isoflurane. After achieving adequate muscle relaxation, the animals were positioned i...

To report repair of a right proximal tibial Salter-Harris type II fracture in a foal with a hybrid external fixator (HEF). Case report. A 5-month-old male foal. After open surgical reduction, an HEF built with wires, 2 half-rings, 3 half-threaded connecting rods, and Schanz pins was used to stabilize the fracture. Immediately after surgery, the foa...

The influence of 2 different levels of the inspired oxygen fraction (FiO2) on blood gas variables was evaluated in dogs with high intracranial pressure (ICP) during propofol anesthesia (induction followed by a continuous rate infusion [CRI] of 0.6 mg/kg/min) and intermittent positive pressure ventilation (IPPV). Eight adult mongrel dogs were anesth...

The effects of propofol and ketamine on physiological parameters, electrocardiography, and analgesia were evaluated in twelve dogs that received propofol-ketamine (0.4mg/kg/min + 0.2mg/kg/min, n=6, PK group) or propofol-S+ketamine (0.4mg/kg/min + 0.1mg/kg/min, n=6, PKS group) after induction of anesthesia with propofol (8.0mg/kg). Assessments of pa...

The present study was designed to determine whether DMSO causes an inhibition on the development of fever in rabbits. The intravenous administration of LPS (1.5µg.kg-1 body weight) caused fever in both saline+LPS and DMSO+LPS group, but the onset and magnitude of the induced fever were significantly different. The saline+LPS group presented a proto...

To evaluate the cardiorespiratory and behavioural effects of epidural xylazine (XYL) or clonidine (CLO) in horses. Blinded, randomized experimental study. Twelve healthy Arabian yearling horses weighing 117-204 kg were randomly allocated into two groups: XYL (n = 6) and CLO (n = 6). An epidural catheter was inserted and a facial arterial catheter w...

The intravenous administration of halogenated anesthetics can be considered an alternative to the application by the inhalation route, moreover, emulsified formulations have been showing safety, efficiency and appropriated anesthetic depth. The aim of this study was to compare the effects of isoflurane anesthesia by intravenous or inhalational rout...

The alpha-2 agonists have sedative, analgesic and muscle relaxation properties in cattle. The ketamine is useful in anesthetic protocols as an inductor agent and it produces analgesia and anesthesia. The combination of ketamine with other drugs is necessary considering that it causes deleterious effects like catalepsy and muscle spasticity if given...

The amitraz is widely used in veterinary medicine as an acaricide in small and large animals. Several reports showed that the systemic effects caused by epidural administration of this substance are the result of its interaction with a-2 adrenoceptors. In the present study, the effects of epidurally amitraz (0,1 or 0,4 mg.kg-1) or 10% DMSO (5,0 mL)...

The effects of epidurally amitraz (0.4mg/kg), xylazine (0.05mg/kg) or 10% dimethyl sulfoxide (5.0ml) over heart rate (HR), systolic arterial pressure (SAP), respiratory rate (RR), ruminal motility (RM), rectal temperature (RT), head height (HH), and latency to heat-evoked reflexes (LSPR - skin of perineal region; LHWR - hoof withdrawal reflex) were...

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To compare the pre-emptive analgesic effects of epidural ketamine or S(+)-ketamine on post-incisional hyperalgesia. Prospective randomized study. Twenty-four mongrel dogs (1-5 years, weighing 11.9+/-1.8 kg). Dogs were anesthetized with propofol (5 mg/kg intravenously) and a lumbosacral epidural catheter was placed. Dogs were randomly allocated to 3...

Os agonistas alfa-2 são muito utilizados como medicação pré-anestésica na espécie bovina, promovendo sedação, analgesia e miorrelaxamento, enquanto a cetamina, em virtude de suas propriedades analgésicas e simpatomiméticas, tem ótimo uso na indução anestésica. Com isso, estudaram-se os efeitos clínicos e cardiovasculares da indução anestésica intra...