hyperventilation/cárie dentária

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[Oxygen hyperventilation of the surgical cavity in the postoperative treatment of the ears].

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Exhaled breath temperature in asthmatics and controls after eucapnic voluntary hyperventilation and a methacholine challenge test.

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BACKGROUND It has been suggested that exhaled breath temperature (EBT) is increased in asthmatic subjects. OBJECTIVE Our aim was to investigate EBT in asthmatics compared to healthy controls before and after eucapnic voluntary hyperventilation (EVH) and a methacholine challenge test (MCT). METHODS A

Activating effect of nasal and oral hyperventilation on epileptic electrographic phenomena: reflex mechanisms of nasal origin.

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In experiments on animals, airflow through the nasal cavity elicits rhythmic synchronized activity that can trigger and/or elicit epileptic electrographic activities in the limbic structures of the brain. This could be demonstrated in studies of lower vertebrates (frogs and turtles). In the turtle

Evaluating the physiological significance of hypoxic hyperventilation in larval zebrafish (Danio rerio).

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In water-breathing fishes, the hypoxic ventilatory response (HVR) represents an increase in water flow over the gills during exposure to lowered ambient O₂ levels. The HVR is a critical defense mechanism that serves to delay the negative consequences of hypoxia on aerobic respiration.

Principles of treatment and indications for surgery in severe multiple trauma.

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Despite major advances, pitfalls in diagnosis and emergency treatment influence the survival chances of multitraumatized patients considerably. Diagnosis of traumatic shock cannot be made by blood pressure, pulse rate and shock index. Immediate shock therapy is indicated in all cases with severe

[Postoperative air embolism caused by pneumatocephalus following occlusion of the posterior fossa. A rare complication indicative of a bridging vein disruption].

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Many neurosurgeons prefer the sitting position for patients undergoing surgery in the posterior fossa because of the easier access and better conditions for haemostasis. Pneumatocephalus is a possible consequence of surgery in the posterior fossa with the patient in the sitting position. When this

[A cured case of hypertensive intracerebellar hematoma (author's transl)].

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A case of hypertensive intracerebellar hematoma surgically treated and cured was reported. The 41-year-old male had two cerebrovascular attacks with headache and vomiting followed by left hemiparesis. Drowsiness and dysarthria appeared the next day. The patient was admitted to a hospital, where

Intraoperative improvement of somatosensory evoked potentials and local spinal cord blood flow in patients with syringomyelia.

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This report is the first to correlate data concerning intraoperative somatosensory evoked potentials (SSEPs) and local spinal cord blood flow (ISCBF) in patients with syringomyelia. In a consecutive study, bilateral median nerve SSEPs were recorded intraoperatively in 13 patients undergoing a syrinx

Chest wall motion during spontaneous breathing and mechanical ventilation in dogs.

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We measured the volume change of the thoracic cavity (delta Vth) and the volumes displaced by the diaphragm (delta Vdi) and rib cage (delta Vrc) in six pentobarbital-anesthetized dogs lying supine. A high-speed X-ray scanner (dynamic spatial reconstructor) provided three-dimensional images of the

Can manual hyperinflation maneuvers cause aspiration of oropharyngeal secretions in patients under mechanical ventilation?

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OBJECTIVE To evaluate whether manual hyperinflation maneuvers can cause aspiration of oropharyngeal secretions in patients under mechanical ventilation. METHODS Adult patients under mechanical ventilation in whom a dye was injected in the oropharyngeal cavity and had their tracheal secretion

Measurement and regulation of nasal airflow resistance in man.

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A method for measuring human nasal airflow resistance (Rnaw) is described. Air flows at constant pressure through both nasal cavities via a face mask and out through the mouth. Airflow is inversely related to Rnaw. The method has several advantages over many other methods for measuring Rnaw, in

Activation of epileptic electrographic phenomena in the human EEG by nasal air flow.

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The activating effect of deep oral breathing (with the nose closed) and nasal hyperventilation (with mouth closed) was examined in 62 patients with three different kinds of epileptic EEG abnormalities: unilateral localized temporal (fronto-temporal, occipito-temporal) abnormalities - group F,

Reducing the deleterious effects of intrauterine CO2 during fetoscopic surgery.

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The fetoscopic approach to fetal intervention is a promising minimally invasive technique for correcting congenital anomalies in utero. However, expansion of the amniotic cavity with CO2 to visualize the fetus causes fetal hypercarbia and acidosis. We assessed whether maternal hyperventilation

Carbon dioxide absorption and gas exchange during pelvic laparoscopy.

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Twelve ASA physical status I-II patients undergoing pelvic laparoscopy for infertility were enrolled in a study to quantify the effects of CO2 insufflation and the Trendelenburg position on CO2 elimination and pulmonary gas exchange, and to determine the minute ventilation required to maintain

[Apnea and oxygen desaturation following nitrous oxide inhalation].

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Apnea and desaturation following nitrous oxide inhalation were studied in seven adult volunteers breathing spontaneously. Arterial oxygen saturation (SpO2), end-tidal CO2 concentration in the nasal cavity and respiratory patterns were measured in volunteers breathing air after N2O (50% or 67%) + O2.

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