Track topics on Twitter Track topics that are important to you
Intrathoracic positive pressure may lead to a change hemodynamics, with repercussions for the intracranial compartment, thereby altering intracranial pressure (ICP) and cerebral perfusion pressure (CPP). This effect may become more intense when using high positive end expiratory pressure (PEEP) values. The aim of the present study was to measure the impact of different PEEP values on ICP, CPP and mean arterial pressure (MAP). MAP, whereas high PEEP values increase ICP, although without clinical relevance.
This study is a prospective clinical trial, developed in the neurological intensive care unit approved by the ethics committee and research in humans. The charge of each patient had information about the study through the completion of informed consent and signed him when he agreed. Were the following inclusion criteria: adult patients with acute CVA and presence of ventricular drainage catheter for invasive monitoring of ICP and without intracranial hypertension. Were adopted as exclusion criteria: increased intracranial pressure, hemodynamic instability as a criterion of loss was used to expressions of interest in charge to leave. All patients completed the study. All patients were from the surgical implantation of the ventricular catheter, arriving to the ICU intubated orally and manually ventilated with an Ambu bag. Were subjected to routine procedures: adjusting the mechanical ventilator (Inter5, Intermed, BR) during assisted controlled cycled pressure and facility to monitor vital signs. After thirty minutes of stable ICU patient in a supine position with head elevated 30 °, the protocol was initiated to assess the impact of PEEP on ICP. To perform the evaluation of lung mechanics ventilatory mode was changed to control volume with the following parameters: tidal volume (Vt) = 8ml/kg weight, peak flow (PF) = 6 x minute volume, fraction of inspired O2 (FiO2) = 40%, respiratory rate (RR) = 16 bpm, sensitivity = 1 cmH2O. The following variables were monitored: PIC, Blood Pressure (BP), heart rate (HR), peak pressure in the airways (pp.) and plateau pressure of the respiratory system (Ppl.), these values were monitored with PEEP = 5 cmH2O. During the assessment protocol was changed to pressure control ventilation mode with the following values of ventilatory parameters: Pp = 30 cm H2O, inspiratory time = 1s; FiO2 = 40%, RR = 16 bpm; Sensitivity = 1 cmH2O. PEEP employed ranged from 0 to 14 cmH2O. To eliminate a possible physiological accommodation by the progressive increase of PEEP, the range of values was determined by drawing a sealed envelope for each patient, ranging from 2 to 2 cmH2O. At each value of PEEP the patient was ventilated for a period of five minutes to carry out monitoring of ICP, BP, HR, PPC and peripheral oxygen saturation (SpO2). The ICP monitoring catheter was kept closed for drainage and open for monitoring, since the arrival of the surgical block, was only open for drainage if there was an increase in ICP above 20 mmHg. The monitoring was carried out using the multiparameter monitor (Siemens 7000). For ICP monitoring the ventricular catheter was connected to a pressure transducer and this monitor. After the parameters evaluated with seven different PEEP values, the ventilatory mode was changed again to control volume again to evaluate pulmonary mechanics with the same initial parameters.
Allocation: Randomized, Control: Active Control, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Treatment
lung mechanics ventilatory, Hemodynamic and intracranial pressure
Universidade Federal de Pernambuco
Published on BioPortfolio: 2014-07-24T14:05:59-0400
Mechanical ventilation can cause damage to the lung parenchyma, this is known as ventilatory induce lung injury (VILI).To avoid this damage, ventilatory strategies have been created, focus...
Intracranial pressure is a cornerstone in neurosurgical care used in a variety of diseases. However currently, doubts regarding normal intracranial pressure exist. Few studies have investi...
To explore the stroke mechanism evolution in patients with intracranial atherosclerotic stenosis by magnetic resonance imaging(MRI) from current first stroke to follow up stroke recurrence...
Increased intracranial pressure is a cause of disease progression in patients with brain disease, a common cause of poor prognosis. Intracranial pressure monitoring is the observation of t...
Prone position in spinal surgery can increase airway pressure and decrease dynamic lung compliance by a frame used for postural stabilization. Also, it can increase hemodynamic instability...
It is unknown which is the best ventilatory approach in patients scheduled for gynecological robotic surgery in Deep Trendelenburg position in terms of respiratory mechanics. 40 patients were enrolled...
Intracranial and Hemodynamic Changes after Succinylcholine Administration in Cats. By Cottrell JE, Hartung J, Giffin JP, and Shwiry B. Anesthesia & Analgesia 1983; 62:1006-9. Reprinted with permission...
Headache disorders attributed to low and high intracranial pressure are commonly encountered in specialty headache practices and may occur more frequently than realized. While the headaches resulting ...
Hypoxia challenges left ventricular (LV) function due to reduced energy supply. Conflicting results exist whether high-altitude exposure impairs LV diastolic function and thus contributes to the high ...
The aim of the study was to analyze the long-term recurrence rate in patients with a first-ever ischemic stroke secondary to intracranial large artery atherosclerosis (LAA) in a Brazilian population.
The capability of the LUNGS to distend under pressure as measured by pulmonary volume change per unit pressure change. While not a complete description of the pressure-volume properties of the lung, it is nevertheless useful in practice as a measure of the comparative stiffness of the lung. (From Best & Taylor's Physiological Basis of Medical Practice, 12th ed, p562)
The branch of physics which deals with the motions of material bodies, including kinematics, dynamics, and statics. When the laws of mechanics are applied to living structures, as to the locomotor system, it is referred to as BIOMECHANICS. (From Dorland, 28th ed)
A group of pathological conditions characterized by sudden, non-convulsive loss of neurological function due to BRAIN ISCHEMIA or INTRACRANIAL HEMORRHAGES. Stroke is classified by the type of tissue NECROSIS, such as the anatomic location, vasculature involved, etiology, age of the affected individual, and hemorrhagic vs. non-hemorrhagic nature. (From Adams et al., Principles of Neurology, 6th ed, pp777-810)
Congenital vascular anomalies in the brain characterized by direct communication between an artery and a vein without passing through the CAPILLARIES. The locations and size of the shunts determine the symptoms including HEADACHES; SEIZURES; STROKE; INTRACRANIAL HEMORRHAGES; mass effect; and vascular steal effect.
Manometric pressure of the CEREBROSPINAL FLUID as measured by lumbar, cerebroventricular, or cisternal puncture. Within the cranial cavity it is called INTRACRANIAL PRESSURE.
In a clinical trial or interventional study, participants receive specific interventions according to the research plan or protocol created by the investigators. These interventions may be medical products, such as drugs or devices; procedures; or change...
Bioethics is the study of controversial ethics brought about by advances in biology and medicine. Bioethicists are concerned with the ethical questions that arise in the relationships among life sciences, biotechnology, medicine, politics, law, and philo...