View clinical trials related to Anesthesia, Pediatric.
Filter by:The incidence of atelectasis is high in patients undergoing general anesthesia. This may cause oxygenation impairment and further contribute to post-operative pulmonary complications. As important airway management devices for general anesthesia, few studies have compared the impact of laryngeal mask airway and spontaneous breathing on atelectasis. Through the study, the distribution of the pulmonary ventilation of children undergoing an elective and standard procedure in our center (H.U.D.E.R.F.) will be studied using electric impedance tomography. Children from 1 year-old to 6-year-old, ASA physical status I or II who will undergo elective circumcisions under general anesthesia associated with regional anesthesia (Penile Block10) at the One Day Clinic of H.U.D.E.R.F. (Hôpital des Enfants Reine Fabiola - Brussels - Belgium). Patients will be allocated to three different group in a ration of 1:1:1. - Group 1: spontaneous mask ventilation (20 patients). - Group 2: spontaneous laryngeal mask (LMA) ventilation (20 patients). - Group 3: spontaneous-pressure support LMA ventilation (LMA SV-PS) (20 patients). - Standard monitoring for the inductions of the anesthesia will include non-invasive blood pressure (NIBP), pulse oximetry (SpO2), Electrocardiogram (ECG), End-Tidal CO2 (EtCO2), End Tidal Sevoflurane concentration (EtSev %), inspired fraction of oxygen (FiO2), body temperature (rectal thermometer). Induction is based as well on the local routine protocols using an inhalation induction of the patient with Sevoflurane (Fet of 6-8%) and a recommended FiO2 from 80-90% maximum until the stabilization of the induction. Then the FiO2 will be decreased at least under 40% and Sevoflurane adapted to the need of the deepness of the anesthesia (both at the discretion of the anesthesiologist in charge of the patient). Depending on the randomization, the patient will undergo the surgery either with spontaneous face mask ventilation (group 1), LMA spontaneous ventilation (group 2), or LMA SV-PS (group 3) (during which the pressure support will be adapted at the discretion of the anesthesiologist but with a tidal volume included in the range of 6-10ml/kg). Electrical impedance tomography measurements: The effects of the spontaneous breathing (mask ventilation or LMA) or the pressure support ventilation (LMA SV-PS) on atelectasis formations and the distribution of the ventilation will be assessed using electrical impedance tomography. The device used during the study will be the "PulmoVista 500"; it will be provided by Dräger (Lübeck, Germany) free of charge and without any obligation or results/conclusions requested by Dräger. The device is approved CE (European regulation) and will be used in the conditions for which it has been designed. A reusable belt with 16 evenly spaced electrodes will be placed around the chest of each patient included in the study between the 4th and 6th ribs as recommended by Dräger. The EIT measurements will be taken of 4 different moments: T1: Before induction of the anesthesia in the preoperatory waiting room (and at least 30 min after the premedication). T2: After the induction of anesthesia (GA and penile block), just before the beginning of the surgical procedure. T3: After the end of the surgical procedure, just before discontinuing the general anesthesia. T4: Before the discharge of the PACU.
The timing of extubation following surgery and anesthesia in young children is a complex decision frequently guided by the experience of the clinician. The clinician frequently must make a decision based on assimilating multiple cues that may or may not demonstrate that the patient is ready for extubation such as eye opening, conjugate gaze, spontaneous ventilation, and end tidal agent concentration. At this time there is no published data on the predictive ability of individual extubation criteria for young patients undergoing anesthesia for surgery so most practice is based solely on experience and anecdotal teaching. In some cases if the timing is misjudged and the patient is extubated too early negative airway reflexes such as breath holding and laryngospasm may take over creating a critical situation in which the patient forgoes gas exchange and rapidly desaturates with the potential for bradycardia and further cardiovascular collapse. Routine criteria used to determine fitness for extubation have been primarily described in the intensive care unit literature and may be less relevant in the operating room in the setting of routine general anesthetics. Most predictors including adequate tidal volume, presence of conjugate gaze, eye opening, patient movement purposeful or otherwise, low end tidal anesthetic agent concentration, response to physical or verbal stimulation and the laryngeal stimulation test have not previously been evaluated to determine their individual predictive value in deciding if the presently anesthetized patient now emerging is ready to be extubated. In order to perform a laryngeal stimulation test the patient must be breathing spontaneously and practitioner will gently move the endotracheal tube up and down stimulating the larynx. In patients in stage 2 of anesthesia, the clinician will typically observe a cough or series of coughs followed by a respiratory pause of greater than 5 seconds. In this situation the patient has not adequately passed through stage 2 and remains at increased risk for apnea, breath holding, or laryngospasm. If the patient is in stage 1 of anesthesia the clinician will observe a cough followed by a brief pause (less than 5 seconds) or almost immediate return to spontaneous ventilation. In conclusion, their exist no quantitative data on the predictive value of these various criteria for extubation and the goal of our study is determine the indivdual predictive value of different criteria in determing fitness for extubaion in young pediatric patients by recording the presence or absence of various criteria in pediatric patients at the time of extubation during routine anesthetic care.