1.The change of nasal airway resistance after rapid maxillaryexpansion.
Jeung Gweon LEE ; Joo Heon YOON ; Young Seok CHUNG ; Hyung Seon BAIK
Korean Journal of Otolaryngology - Head and Neck Surgery 1991;34(3):544-552
No abstract available.
Airway Resistance*
2.Comparison of measurements of airway resistance during panting and quiet breathing.
Seon Hee CHEON ; Woo Hyung LEE ; Kee Young LEE ; Se Kyu KIM ; Joon CHANG ; Sung Kyu KIM ; Won Young LEE
Tuberculosis and Respiratory Diseases 1993;40(3):267-273
No abstract available.
Airway Resistance*
;
Respiration*
3.Impulse oscillometry as a method measuring airway resistance.
Korean Journal of Medicine 2000;59(6):683-683
No abstract available.
Airway Resistance*
;
Oscillometry*
4.Research of Disposable Respiratory Filter to the Measurement of Impulse Oscillometery.
Chinese Journal of Medical Instrumentation 2020;44(1):76-79
OBJECTIVE:
To study the influence of disposable respiratory filter on the results of impulse oscillometery.
METHODS:
90 healthy subjects were randomly selected and impulse oscillometery results were taken repeatedly through disposable respiratory filter and control device. All results were statistically analyzed.
RESULTS:
When using the disposable respiratory filter, respiratory impedance (Zrs) and resistance at all frequency (R5Hz-R35Hz) were significantly increased compared with the control device (P<0.01). The two measurements had a significant linear correlation (P<0.01) and a regression equation was established. The disposable respiratory filter did not exist in statistic difference to response frequency (Fres) and the elastic resistance (X5Hz-X15Hz) at all frequency(P>0.05).
CONCLUSIONS
The disposable respiratory filter can be used when testing pulmonary compliance, chest wall disease and obstruction outside the airway in impulse oscillometery system to avoid infection and ensure quality.
Airway Resistance
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Filtration/instrumentation*
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Humans
;
Oscillometry
5.Airway Obstruetion after Endotracheal Intubation .
Sun Jong KI ; Jun Rae LEE ; Sirk Goo CHONG ; Huhn CHOE
Korean Journal of Anesthesiology 1980;13(4):421-425
Endotracheal intubation has been a routine practice in general anesthesia and is accepted by anesthetiste and surgeons as an integral part of airway management during anesthesia and operation. Paradoxically however, there have been several cases of obstruction of the airway which occurred due to endotracheal intubation. The authors experienced two cases of airway obstruction due tendotracheal and endobronchial techniques, using tubes with malfunctioning cuffs. The lumen of an endotracheal tube was collapsed by intracuff pressure, shortly after inflation of the cuff and resulted in extremely high airway resistance. In the other case, gradual leakage of air from the distal cuff of a Carlens tube led to collapse of the distal cuff. This promoted the movement of blood, secretions, and pus from the diseased right lung to the normal healthy left lung in association with the left lateral recumbent position, which in turn resulted in total airway obstruction.
Airway Management
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Airway Obstruction
;
Airway Resistance
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Anesthesia
;
Anesthesia, General
;
Inflation, Economic
;
Intubation, Intratracheal*
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Lung
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Suppuration
;
Surgeons
6.Awake cephalometric analysis of posterior airway space and calculated resistance related to respiratory disturbance index before and after maxillomandibular advancement for obstructive sleep apnea.
Journal of the Korean Association of Oral and Maxillofacial Surgeons 2001;27(2):157-161
The purpose of this study cephalometrically evaluated changes in the posterior airway space for patients with obstructive sleep apnea syndrome(OSAS) before and after surgical advancement of the maxilla and mandible. The change in calculated airway resistance was correlated with the respiratory disturbance index(RDI). Twenty cephalometric radiographs were traced before and after surgery to determine the posterior airway area and calculate resistance. Polysomnograms of each patient were obtained before and after surgery. All patients had a decrease in calculated airflow resistance in the airway. The mean amount of resistance was 865.15 before surgery, decreasing to 192.65 after surgery (p<0.01). Eighty-five percent of the patients experienced improvement in their RDI. Reduction in the RDI appears to be due to an increase in the posterior airway space and decrease in flow resistance.
Airway Resistance
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Humans
;
Mandible
;
Maxilla
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Polysomnography
;
Sleep Apnea, Obstructive*
7.The Change of SaO2, PFT and ABGA During the Bronchofiberscopy.
Jong Seon KIM ; Jeon Eun SHIN ; Tae Hee KIM ; Jung Hyun CHANG ; Seon Hee CHEON
Tuberculosis and Respiratory Diseases 1998;45(3):574-582
BACKGROUND: Bronchofiberscopy is a procedure with a chance of airway irritation and it may cause pathophysiologic changes of respiratory system. So we tried to evaluate the influence of bronchofibercopy on O2 saturation, ABGA and PET by patient's basal status and procedure type. METHOD: O2 saturation was measured every 1 minute from the left index finger tip with percutaneous oximetry. ABGA was done before and right after the bronchofiberscopy and PFT was done before and within 10 minutes after the bronchofiberscopy. RESULTS: The mean time for bronehofiberscopy procedure was 14.5mim and SaO2 maximally fall to 89.0 below 8% of the baseline after mean time of 8.4mm, which was recorvered at the end of the procedure. SaO2 change amount was 8.4% on Non-O2 supply group, which was lower compared to 6.4% of the O2-supply group without statistically significance. Biopsy Group and BAL group showed more SaO2 fall than washing only group. The level of PaO2 and FEV1 of the patient didn's influence significantly on SaO2 fall during the procedure. ABGA taken before and after the bronchofiberscopy showed mild fall of Pa02 and mild rise of PaCO2. Whereas PET showed decrease of FEV1(P<0.05) and increase of RV without changes in airway resistance and pulmonary diffusion capacity. Comparing before and after the bronchofiberscopy, the washing group showed no significant changes on PET, while the biopsy group and the BAL group showed increase of RV & decrease of FEV1 after the bronchofiberscopy. BAL group showed more changing tendency rather than biopsy group although not statistically significant. CONCLUSION: Bronchofiberscopy is considered as a relatively safe procedure, but it would be better to be done with O2 supply especially in the patient with low PaO2 and in the case of biopsy and BAL
Airway Resistance
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Biopsy
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Diffusion
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Fingers
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Humans
;
Oximetry
;
Respiratory System
8.A case of HME obstruction by distilled water from incidentally mounted heated wire circuit kit: A case report.
Chae In JEONG ; Sang Il LEE ; Yeo Hyun AHN ; Ji Yeon KIM ; Kyung Tae KIM ; Jang Su PARK ; Jung Won KIM
Korean Journal of Anesthesiology 2009;57(3):358-360
Heat-moisture exchanger (HME) is an inexpensive and effective device used to prevent respiratory complications that can be caused by endotracheal tube insertion during general anesthesia. But, HME can increase airway resistance and be occluded by the patient's secretions. Whether a HME could be occluded by clear fluids such as condensate in the airway circuit is not certain yet. In vitro, a case of HME occlusion by normal saline was reported. We report a case of HME obstruction by distilled water came from the heated wire circuit which was unintentionally connected to the HME.
Airway Resistance
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Anesthesia, General
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Hot Temperature
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Porphyrins
;
Water
9.Proseal Laryngeal Mask Airway for the Resection of a High Grade Upper Tracheal Stenosis: A case report.
Chan Hong PARK ; Ho Seung HYUN ; Jin Yong CHUNG ; Woon Seok ROH ; Bong Il KIM ; Sang Hoon JHEON
Korean Journal of Anesthesiology 2005;48(3):315-319
Laryngeal mask airways (LMAs) have several advantages compared with conventional endotracheal tube (ETT) in tracheal surgery. LMAs cannot penetrate the airway below the level of the glottis, but enable the access to the larynx and tracheobronchial tree while avoiding airflow impairment, tracheal stimulation, trauma, and the interference of tracheal mucosal blood flow. Moreover, LMAs have lower airway resistance than ETTs. We describe the use of a proseal laryngeal mask airway (PLMA) in patients with high grade upper tracheal stenosis. We suggest that PLMA might have advantages over the classic LMA by preventing aspiration and by allowing the evacuation of air from the stomach in high-grade upper tracheal stenosis.
Airway Resistance
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Glottis
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Humans
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Laryngeal Masks*
;
Larynx
;
Stomach
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Tracheal Stenosis*
10.A Study of Nasal Airway Resistance and Nasal Airflow in Augmentation Rhinoplasty.
Perapun JAREONCHARSRI ; Phadej DACHPUNPOUR ; Kittirat UNKANONT ; Chaweewan BUNNAG
Journal of Rhinology 1997;4(1):34-37
Active anterior rhinomanometry (AAR) was performed in 42 patients with low-profile or saddle noses before augmentation rhinoplasty (AR) and after AR. The purpose was to measure nasal airway resistance (NAR) and nasal airflow (NAF). There were 38 females and 4 males, whose ages ranged from 15 to 42 years (mean 29.6 years). Preoperative total NAR at 75 Pascals (Pa) was 0.24+/-0.09 and 0.20+/-0.06 Pa/ml/sec for the non-decongested and decongested value respectively. Two weeks postoperatively, the total NAR was 0.19+/-0.06 and 0.15+/-0.05 Pa/ml/sec for the non-decongested and decongested value respectively, which was significantly less than the preoperative value. The postoperative total NAF was 422.31+/-137.05 cm3 and 514. 57+/-152.45 cm3 for the non-decongested and decongested value respectively, which was significantly increased when compared to the preoperative value (342.57+/-109.27 cm3 and 399.90+/-106.98 cm3 for the non-decongested and decongested value respectively). The comparison between the changes in NAR and subjective nasal breathing showed that the postoperative NAR decreased in 88.10% of patients while subjective nasal breathing improved in only 52.38%. Postoperative NAR increased in 9.52% of patients, while subjective nasal breathing was worsened in 2.38%. The results of this study indicate that AR has decreased the NAR and increased NAF, and thus improving the nasal breathing. From this preliminary study it is concluded that AR is useful not only for the aesthetic aspect but also for its effect on the function of the nose, especially on the improvement of nasal breathing.
Airway Resistance*
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Female
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Humans
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Male
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Nose
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Respiration
;
Rhinomanometry
;
Rhinoplasty*