ABSTRACT
Abstract Introduction The cuff of an endotracheal tube seals the airway to facilitate positive-pressure ventilation and reduce subglottic secretion aspiration. However, an increase or decrease in endotracheal tube intracuff pressure can lead to many morbidities. Objective The main purpose of this study is to investigate the effect of different head and neck positions on endotracheal tube intracuff pressure during ear and head and neck surgeries. Methods A total of 90 patients undergoing elective right ear (Group 1: n = 30), left ear (Group 2: n = 30) or head and neck (Group 3: n = 30) surgery were involved in the study. A standardized general anesthetic was given and cuffed endotracheal tubes by the assistance of video laryngoscope were placed in all patients. The pilot balloon of each endotracheal tube was connected to the pressure transducer and standard invasive pressure monitoring was set to measure intracuff pressure values continuously. The first intracuff pressure value was adjusted to 18.4 mmHg (25 cm H2O) at supine and neutral neck position. The patients then were given appropriate head and neck positions before related-surgery started. These positions were left rotation, right rotation and extension by under-shoulder pillow with left/right rotation for Groups 1, 2 and 3, respectively. The intracuff pressures were measured and noted after each position, at 15th, 30th, 60th, 90th minutes and before the extubation. If intracuff pressure deviated from the targeted value of 20-30 cm H2O at anytime, it was set to 25 cm H2O again. Results The intracuff pressure values were increased from 25 to 26.73 (25-28.61) cm H2O after left neck rotation (p = 0.009) and from 25 to 27.20 (25.52-28.67) cm H2O after right neck rotation (p = 0.012) in Groups 1 and 2, respectively. In Group 3, intracuff pressure values at the neutral position, after extension by under-shoulder pillow and left or right rotation were 25, 29.41 (27.02-36.94) and 34.55 (28.43-37.31) cm H2O, respectively. There were significant differences between the neutral position and extension by under-shoulder pillow (p < 0.001), and also between neutral position and rotation after extension (p < 0.001). However, there was no statistically significant increase of intracuff pressure between extension by under-shoulder pillow and neck rotation after extension positions (p = 0.033). Conclusion Accessing the continuous intracuff pressure value measurements before and during ear and head and neck surgeries is beneficial to avoid possible adverse effects/complications of surgical position-related pressure changes.
Resumo Introdução O manguito ou cuff de um tubo endotraqueal sela as vias aéreas para facilitar a ventilação com pressão positiva e reduzir a aspiração de secreção subglótica. Entretanto, o aumento ou diminuição da pressão intracuff do tubo endotraqueal pode levar a muitas morbidades. Objetivo Investigar o efeito de diferentes posições da cabeça e pescoço da pressão intracuff do tubo endotraqueal durante cirurgias de orelha e cabeça e pescoço. Método Participaram do estudo 90 pacientes submetidos à cirurgia eletiva na orelha direita (Grupo 1: n = 30), orelha esquerda (Grupo 2: n = 30) ou cabeça e pescoço (Grupo 3: n = 30). Um anestésico geral padronizado foi administrado e o tubo endotraqueal com cuff foi colocado em todos os pacientes através de videolaringoscopia. O balão-piloto de cada tubo endotraqueal foi conectado ao transdutor de pressão e o monitoramento-padrão da pressão invasiva foi estabelecido para medir continuamente os valores da pressão intracuff. O primeiro valor de pressão intracuff foi ajustado para 18,4 mmHg (25 cm H2O) na posição supina e neutra do pescoço. Em seguida, os pacientes foram colocados nas posições cirúrgicas apropriadas de cabeça e pescoço antes do início da cirurgia. Essas posições foram rotação esquerda, rotação direita e extensão por rotação esquerda/direita com almofada sob o ombro, para os grupos 1, 2 e 3, respectivamente. As pressões intracuff s foram medidas e anotadas após cada posição, aos 15, 30, 60, 90 minutos e antes da extubação. Se a pressão intracuff saísse do valor desejado de 20 ~ 30 cm H2O a qualquer momento, ela era definida em 25 cm H2O novamente. Resultados Os valores de pressão intracuff aumentaram de 25 para 26,73 (25-28,61) cm H2O após a rotação do pescoço para a esquerda (p = 0,009) e de 25 a 27,20 (25,52-28,67) cm H2O após rotação do pescoço para a direita (p = 0,012) nos grupos 1 e 2, respectivamente. No Grupo 3, os valores da pressão intracuff na posição neutra, após extensão com almofada sob o ombro e rotação para a esquerda ou direita, foram 25, 29,41 (27,02-36,94) e 34,55 (28,43-37,31) cm H2O, respectivamente. Houve diferenças significativas entre a posição neutra e a extensão com almofada sob o ombro (p < 0,001) e também entre a posição neutra e a rotação após a extensão (p < 0,001). Entretanto, não houve aumento estatisticamente significante da pressão intracuff entre extensão com almofada sob o ombro e rotação do pescoço após as posições de extensão (p = 0,033). Conclusão As medições contínuas do valor da pressão intracuff antes e durante cirurgias de orelha e cabeça e pescoço são benéficas para evitar possíveis efeitos adversos/complicações de alterações de pressão relacionadas à posição cirúrgica.
ABSTRACT
Background: Postoperative sore throat is the most common and most distressing complaint of patients after general anaesthesia with cuffed endotracheal tube. By this study our aim was to assess the efficacy of intracuff dexamethasone in reducing the incidence of this distressing postoperative symptom.Methods: Patients were divided into two groups D and N depending on cuff filling with dexamethasone and normal saline respectively. The cuff was prefilled with dexamethasone or normal saline one hour prior to intubation to allow time for cuff to be saturated following which the cuff was deflated. General anaesthesia was administered and patients were intubated, and cuff inflated with drug according to group allocated. Patients were assessed and graded for sore throat using VAS scale both at rest and with swallowing. Assessment was done one hour, six, 12 and 24hours post operatively. Presence of hoarseness of voice and cough was assessed on a 2-point scale 0=absent and 1=present, 24hrs after surgery.Results: The incidence of sore throat at 24hours postoperative was reduced in group D than in group N. 4 patients (8%) in group D had sore throat while 27 patients (57%) in group N had sore throat at 24hours. This was statistically significant (p<0.05). The cough incidence was reduced in group D while there was no difference in incidence of hoarseness of voice between the two groups.Conclusions: Intracuff dexamethasone decreases the incidence of postoperative sore throat when compared to intracuff normal saline. Dexamethasone also reduces postoperative cough incidence but does not reduce the incidence of hoarseness of voice.
ABSTRACT
To compare the intra cuff pressure changes during improved and the traditional method of cuff pressure measurement, then evaluate the effects of ventilator-associated pneumonia (VAP) prevention. The results highlighted practical recommendations in the process of ETT cuff pressure measurement. Methods① Experimental studies were carried out on the tracheal model with two groups: traditional pressure measurement group and improved pressure measurement group. The traditional pressure measurement group was connected to a handheld pressure gauge with the indicate cuff to get the intra-cuff pressure. The improved method was to insert a 3-way stopcock between the handheld pressure gauge and the indicate cuff. The 3-way stopcock to stabilize handheld pressure gauge reading at 32 cmH2O (1 cmH2O = 0.098 kPa) before measure the intra-cuff pressure. The pressure loss caused by two pressure measurement methods and the leakage of liquid on the balloon after 10 minutes was compared.② Clinical researches: a historic cohort study, patients with mechanical ventilation (MV) admitted to intensive care unit (ICU) of Guangxi Medical University Cancer Hospital from June 2014 to May 2018 were enrolled. The control group (249 cases) was treated with traditional method during June 2014 to May 2016, and the observation group (314 cases) was treated with improved method during June 2016 to May 2018. Clusters of strategies and actions of VAP prevention were applied in both groups. Incidence of VAP, duration of MV, and the length of ICU stay were compared between the two groups. Results ① Experimental study: the pressure leakage of the traditional pressure measurement group was (10.18±0.47) cmH2O, and that of the improved pressure measurement group was (1.33±0.42) cmH2O, with statistically significant difference between the two groups (t = 32.535, P = 0.000). All fluid on the cuffs leak after 10 minutes of traditional ways of measurement, however, no visible fluid on the cuffs leaked with improved procedures. ② Clinical research: the incidence of VAP in the observation group was slightly lower than that in the control group, however there was no significant difference [5.10% (16/314) vs. 8.43% (21/249), P > 0.05]. The duration of MV and the length of ICU stay in the observation group were significantly shorter than those in the control group (days: 9.93±3.14 vs. 16.77±5.45, 11.63 ±2.28 vs. 19.12±5.10, both P < 0.01). Conclusion The improved procedures of intra-cuff pressure measurement is a practical method to avoid the pressure leakage and fluid leakage, and the clinical course of MV patients can be significantly improved by combining the clusters of nursing strategies and actions.
ABSTRACT
BACKGROUND: The cuff of the laryngeal mask airway (LMA) is preferred to be partially inflated before insertion in pediatric cases. However, it is not known how much inflation is appropriate. In addition, intra-cuff pressure is not routinely monitored in many institutions despite the fact that a neglected high cuff pressure could cause several complications. This study was conducted to determine whether the cuff inflated with its resting volume before insertion could have a clinically tolerable intra-cuff pressure after insertion. METHODS: One hundred fifty unpremedicated children aged 0 to 9 yrs were enrolled. The pilot balloon valve was connected to a piston-free syringe to keep the valve open to the atmosphere and allowing the pressure within the cuff of to LMA to equalize to atmospheric pressure. Anesthesia was induced with 6 vol% of sevoflurane in oxygen. After insertion and final positioning of the LMA, the intra-cuff pressure was measured using a cuff pressure manometer. RESULTS: The mean intra-cuff pressure was 50 +/- 12.9 cmH2O; intra-cuff pressures were 39.1 +/- 9.3, 51.6 +/- 11.2, and 64.6 +/- 12.5 cmH2O for LMAs of sizes 1.5, 2, and 2.5, respectively. Intra-cuff pressure of more than 60 cmH2O was measured in 26 patients, and the median value was 70 cmH2O. There was weak statistical correlation among age, height, and weight with intra-cuff pressure. CONCLUSIONS: The cuff inflated by the resting volume before insertion may be a simple method for guaranteeing tolerable cuff pressure after insertion.
Subject(s)
Aged , Child , Humans , Anesthesia , Atmosphere , Atmospheric Pressure , Inflation, Economic , Laryngeal Masks , Methyl Ethers , Oxygen , SyringesABSTRACT
BACKGROUND: The cuff of the laryngeal mask airway (LMA) is preferred to be partially inflated before insertion in pediatric cases. However, it is not known how much inflation is appropriate. In addition, intra-cuff pressure is not routinely monitored in many institutions despite the fact that a neglected high cuff pressure could cause several complications. This study was conducted to determine whether the cuff inflated with its resting volume before insertion could have a clinically tolerable intra-cuff pressure after insertion. METHODS: One hundred fifty unpremedicated children aged 0 to 9 yrs were enrolled. The pilot balloon valve was connected to a piston-free syringe to keep the valve open to the atmosphere and allowing the pressure within the cuff of to LMA to equalize to atmospheric pressure. Anesthesia was induced with 6 vol% of sevoflurane in oxygen. After insertion and final positioning of the LMA, the intra-cuff pressure was measured using a cuff pressure manometer. RESULTS: The mean intra-cuff pressure was 50 +/- 12.9 cmH2O; intra-cuff pressures were 39.1 +/- 9.3, 51.6 +/- 11.2, and 64.6 +/- 12.5 cmH2O for LMAs of sizes 1.5, 2, and 2.5, respectively. Intra-cuff pressure of more than 60 cmH2O was measured in 26 patients, and the median value was 70 cmH2O. There was weak statistical correlation among age, height, and weight with intra-cuff pressure. CONCLUSIONS: The cuff inflated by the resting volume before insertion may be a simple method for guaranteeing tolerable cuff pressure after insertion.
Subject(s)
Aged , Child , Humans , Anesthesia , Atmosphere , Atmospheric Pressure , Inflation, Economic , Laryngeal Masks , Methyl Ethers , Oxygen , SyringesABSTRACT
Esta pesquisa teve como objetivos observar a realização das pressões do cuff; mensurar as pressões do cuff; identificar as potenciais complicações e sua repercussão nos clientes. Trata-se de uma pesquisa quase experimental, quantitativa, descritiva e com abordagem positivista. A partir da análise dos dados, foi evidenciado que as pressões iniciais estavam alteradas, expondo os pacientes às possíveis complicações relacionadas às altas pressões. Observou-se que a mensuração da pressão intra-cuff não está inserida na prática da equipe.
Subject(s)
Humans , Male , Female , Adult , Nursing Care/methods , Nursing, Team , Intubation, IntratrachealABSTRACT
Objective To evaluate the effect of nitrous oxide(N2O) on the cuff pressure of ProSeal laryngeal mask airway(PLMA) in pediatric anesthesia. Methods Thirty-two pediatic patients were enrolled and divided into two groups randomly.PLMA cuffs were inflated with air(Group A) or 50% N2O/oxyen(Group N) to 20 mmHg as initial pressure.The intracuff pressure was monitored during anesthesia with 50% N2O in oxygen. Results Intracuff pressure increased to(40.6?9.3) mmHg in Group A and slightly decreased in Group N.Deflation volume in Group A was much more than that in Group N[(4.4?2.3) mL vs(2.6?1.0) mL,P
ABSTRACT
BACKGROUND: Elevated blood pressures during emergence from general anesthesia in patients with hypertension often result in undesirable complications such as myocardial ischemia, intracranial hemorrhages. The aim of this study was to assess the effect of intracuff 4% lidocaine on the dosage of nitroglycerine required to maintain the stable blood pressure during peri-extubation period in patients with hypertension. METHODS: Forty-nine patients scheduled for elective surgery were randomly allocated to group 1 and 2. We filled endotracheal tube's cuff with normal saline for group 1 and with 4% lidocaine for group 2. Blood pressures and heart rates were recorded before operation, during emergence, and after extubation. Nitroglycerine infusion was adjusted to maintain systolic blood pressure below 150 mmHg. Total infused dosages of nitroglycerine were recorded during operation and after stop of inhalational anesthetics for comparison of both groups' hemodynamic stability. RESULTS: Mean infused volume (microg/kg/min) of nitroglycerine during peri-extubation period was less in the group 2 than group 1. CONCLUSIONS: Intra-cuff 4% lidocaine in patients with hypertension during emergence from general anesthesia reduces the nitroglycerine dosage required to maintain hemodynamic stability.
Subject(s)
Humans , Anesthesia, General , Anesthetics , Blood Pressure , Heart Rate , Hemodynamics , Hypertension , Intracranial Hemorrhages , Lidocaine , Myocardial Ischemia , NitroglycerinABSTRACT
BACKGROUND: Uncuffed endotracheal tubes are commonly used in pediatrics even when the risk of gastric aspiration is significant. But cuffed endotracheal tubes effectively protect the risk of pulmonary aspiration and completely seal the airway. This study was designed to determine the appropriate cuff volume and pressure with low risk of ischemic injury to children's airway. METHODS: We intubated cuffed endotracheal tube (internal diameter 4.5, 5.0, 5.5 mm) in 90 surgical pediatric patient from 16 to 118 months of age. After intubation, initial cuff volume and pressure were measured at the level of complete sealing in each group. Each group was administrated 50% nitrous oxide and 67% nitrous oxide and measured cuff pressure at 20 minutes, 40 minutes. RESULTS: 1) The mean initial cuff volume and pressure of 4.5 ID tube were 0.59 +/- 0.16 ml and 14.5 +/- 0.31 cmH2O (n=30). 2) The mean initial cuff volume and pressure of 5.0 ID tube were 1.00 +/- 0.38 ml and 14.3 +/- 3.55 cmH2O (n=30). 3) The mean initial cuff volume and pressure of 5.5 ID tube were 1.06 +/- 0.26 ml and 14.28 +/- 2.01 cmH2O (n=30). 4) The cuff pressure increased significantly in the course of time, but no pressure in three groups was above 30 cmH2O. CONCLUSIONS: We could determine the appropriate cuff volume of cuffed endotracheal tube in pediatric patients. Also we concluded that nitrous oxide concentration affect little intracuff pressure in brief operation.
Subject(s)
Humans , Anesthesia, General , Intubation , Nitrous Oxide , PediatricsABSTRACT
Although cuffed tracheal tubes are available in various sizes(ranging from 5 to 11 mm I.D.), many anesthesiologists are apt to use a limited range of sizes in adult patients. In making a selection, we prefer the ease of insertion of a smaller tube and the better gas flow characteristics of a larger tube. However, when the tube in small perimeter of cuff or over-large cuffed tube is selected to seal the trachea, intracuff pressure exceeds tracheal capillary perfusion pressure and results in tracheal complication during prolonged general anesthesia with N2O-O2 mixture. This study was performed to determine the appropriate size of tubes for men(Group A, n=30) and women(Group B, n=30), using the large-volume, low-pressure cuffed tubes(Portex-Blue Line Tubes, U.K.) during prolonged general anesthesia with N2O-O2 mixture. They were subdivided into A-l(7.5 mm I.D.), A-2(8.0 mm I.D.), A-3(8.5 mm I.D.) in men and B-l(6.5 mm I.D.), B-2(7.0 mm I.D.), B-3(7.5 mm I.D.) in women. Each subgmup included 10 patients in number. They were compared in several factors; residual volume of each tube, sealing volume, sealing pressure and the intracuff pressure changes with time. The results were as follows 1) There were no significant differences in age, height, and weight among the subgroups in men and women respectively. 2) There were significant changes of intracuff pressure every 20 minutes in both groups and the changes of slope of pressure were significantly steep in 7.5 mm I.D. in men and 6.5 mm I.D. in women. 3) Although the values of sealing pressure of all groups were less than 22 mmHg, the intracuff pressure were increased and maintained over 22 mmHg after 100 minutes in 7.5 mm I.D. in men and 20 minutes in 6.5 mm I.D. in women. 4) The changes in volumes(delta V) after 2 hours among 6 subgroups were not statistically significant, but the changes in pressures(delta P) were higher in 7.5 mm I.D.in men and 6.5 mm I.D. in women. 5) According to Spearman's Correlation Coeffients, the smaller the residual volume of tube, the higher the sealing pressure to seal the trachea and the larger the pressure changes to volume changes. In conclusion, intracuff pressure of 7.5 mm I.D. in men and that of 6.5 mm 1.D. in women can easily exceed the tracheal capillary perfusion pressure during prolonged general anesthesia with N2O-O2 mixture and when considering the changes of intracuff pressure alone, it seems that 8.0, 8.5 mm I.D. in men and 7.0, 7.5 mm I.D. in women are preferable to seal the trachea.
Subject(s)
Adult , Female , Humans , Male , Anesthesia, General , Capillaries , Perfusion , Residual Volume , TracheaABSTRACT
The development of endotracheal tubes with high-volume and low-pressure cuffs has decreas ed the incidence of associated tracheal injury. If room air used for inflation of the cuff during general anesthesia using N2O-O2, mixtures, however, endotracheal tube cuff result in distention and potential pressure changes. Therefore, tracheal pressure injury may occur during long general anesthesia(especially, head and neck surgery). For the prevention of this problems and the determination of proper methods, we performed this study relating to nitrous oxide diffusion into a gas filled endotracheal tube cuff.
Subject(s)
Anesthesia, General , Diffusion , Head , Incidence , Inflation, Economic , Neck , Nitrous OxideABSTRACT
A few postulated methods of regulating cuff pressure (filling anesthetic gas in the cuff, filling saline in the cuff, connecting cuff to a pressure regulating device) were compared each other after determining compliance curve of cuffs. Although there were no significant difference among slopes of linear regression curve of compliance curves of each condition, pressure range, standard deviation were most acceptable with the use of a pressure regulating device.