Evaluation of emergence agitation after general anaesthesia in rhinoplasty patients: Inhalation anaesthesia versus total intravenous anaesthesia

BackgroundEmergence agitation (EA) is a clinical condition that occurs early in recovery from general anaesthesia, and reduces patient comfort. The aim of this study was to compare the effects of low-flow sevoflurane anaesthesia and total intravenous anaesthesia (TIVA) on agitation in rhinoplasty patients, and to determine the frequency of EA in low flow sevoflurane anaesthesia after rhinoplasty.Material and methodsA total of 90 rhinoplasty patients, under general anaesthesia were included in this prospective randomised study. After induction of anaesthesia, propofol infusion was initiated in the TIVA group (n = 45), and sevoflurane was administered in the SEVO group with a fresh gas flow of 1 l/min and MAC (minimum alveolar concentration) 1–1.1 (n = 45). Early emergence times, Richmond agitation-sedation scale (RASS), Boezaart scale, Likert scale and incidences of nausea/vomiting were recorded at the end of surgery.ResultsEarly emergence time was significantly shorter in the TIVA group, than in the SEVO group (p < 0.001). İntraoperative bleeding was significantly lower in the TIVA group, than in the SEVO group (p = 0.005), and surgical field image quality and surgeon satisfaction were better in the TIVA group (p = 0.016, p < 0.001). The ratio of patients with RASS > +1 for all patients was 35.6% at 0 min, postoperatively. This rate was 12.2% (n = 11) in the TIVA group, and 23.3% (n = 21) in the SEVO group (p = 0.028).ConclusionsIn rhinoplasty, TIVA caused shorter early emergence times, less bleeding, high surgeon satisfaction, and lower EA scores when compared with low flow sevoflurane anaesthesia.     

Nasal packing and transseptal suturing techniques: surgical and anaesthetic perspectives

The objective of this study is to compare the nasal packing and the transseptal suturing techniques regarding the extubation difficulty evaluation scores, follow-up times in post-anaesthesia care unit (PACU), pain scores, and postoperative complications. Two hundred patients who underwent septoplasty from January 2009 to October 2009 were randomly assigned either to have nasal packs (n: 100) or transeptal sutures (n: 100). In the transseptal suture group, extubation was easier and PACU follow-up times were shorter, when compared to the nasal packing group (p < 0.001). Patients with nasal packing had significantly higher pain scores (p < 0.001). Minor bleeding was significantly higher in the transseptal group with seven cases, compared to the nasal packing group without any bleeding cases (p = 0.014). There were two patients who had postoperative major bleeding, and two patients who had septal hematoma in the transseptal suture group. One patient with nasal packing had postoperative infection. Septal perforation was not seen in any of the cases. While patients in both groups experienced postoperative crusting, patients in the transseptal suture group also complained about foreign body sensation. Extubation was more comfortable; post-anaesthesia monitorization duration was shorter, and postoperative pain was less, but minor bleeding was seen more with transseptal sutures. There was no significant difference in terms of major bleeding, hematoma, infection or perforation. Foreign body sensation was the main cause of postoperative discomfort in the transseptal suture group. Transseptal suturing might be a significantly comfortable, cost-effective and reliable alternative to nasal packing.     

The effect of propofol infusion with topical epinephrine on cochlear blood flow and hearing: An experimental study

Background and objectivePropofol is the most commonly used intravenous (IV) anesthetic agent and is associated with hypotension upon induction of anesthesia. Intravenous propofol infusion has several properties that may be beneficial to patients undergoing middle ear surgery. Topical application of concentrated epinephrine is a valuable tool for achieving hemostasis in the middle ear and during mastoid surgery. The purpose of the present study was to determine the effects of propofol infusion with topical epinephrine on cochlear blood flow (CBF) and hearing in rats.Materials and methodsTwenty one male Sprague-Dawley rats were divided into three groups. The rate of intravenous infusion of propofol was 4–6 ml/kg/hour. The first group (control group, n = 7) was given IV infusion of phosphate buffered saline (PBS) with topical application of PBS in the round window. In study group A (n = 7), the effect of topical phosphate buffered saline with IV infusion of propofol on CBF and hearing was evaluated. In study group B (n = 7), additional effects of topical epinephrine with IV infusion of propofol on CBF and hearing were evaluated. The laser Doppler blood flowmeter, CBF, and the mean arterial blood pressure (MAP) were measured and analyzed. Additionally, hearing test using auditory brainstem response (ABR) was performed in both groups.ResultsIn both groups, infusion of propofol induced a time-dependent decrease in MAP. Approximately 30 min after the start of the propofol infusion, the CBF started to decrease slowly. The decrease in CBF was significantly greater in the study group compared to the control group. The threshold was elevated in the study group relative to the control group.ConclusionDuring middle ear surgery, use of IV infusion of propofol with topical epinephrine cotton ball or cottonoid application is not recommended.     

Pain management following myringotomy and tube placement: Intranasal dexmedetomidine versus intranasal fentanyl

Purpose

Despite the brevity of the procedure, bilateral myringotomy and tympanostomy tube placement (BMT) can result in significant postoperative pain and discomfort. As the procedure is frequently performed without intravenous access, non-parenteral routes of administration are frequently used for analgesia. The current study prospectively compares the efficacy of intranasal (IN) dexmedetomidine with IN fentanyl for children undergoing BMT.

Methods

This prospective, double-blinded, randomized clinical trial included pediatric patients undergoing BMT. The patients were randomized to receive either IN dexmedetomidine (1 μg/kg) or fentanyl (2 μg/kg) after the induction of general anesthesia with sevoflurane. All patients received rectal acetaminophen (40 mg/kg) and the first 50 patients also received premedication with oral midazolam. Postoperative pain and recovery were assessed using pediatric pain and recovery scales, and any adverse effects were monitored for.

Results

The study cohort included 100 patients who ranged in age from 1 to 7.7 years and in weight from 8.6 to 37.4 kg. They were divided into 4 groups with 25 patients in each group: (1) midazolam premedication + IN dexmedetomidine; (2) midazolam premedication + IN fentanyl; (3) no premedication + IN dexmedetomidine; and (4) no premedication + IN fentanyl. Pain scores were comparable when comparing groups 2, 3 and 4, but were higher in group 1 (midazolam premedication with IN dexmedetomidine). There was no difference in total time in the post-anesthesia care unit (PACU) or time from arrival in the PACU until hospital discharge between the 4 groups. The heart rate (HR) was significantly lower in group 3 when compared to the other groups at several different times after arrival to the PACU. No clinically significant difference was noted in blood pressure.

Conclusion

Following BMT, when no premedication is administered, there was no clinical advantage when comparing IN dexmedetomidine (1 μg/kg) to IN fentanyl (2 μg/kg). The addition of oral midazolam as a premedication worsened the outcome measures particularly for children receiving IN dexmedetomidine.     

Oxymetazoline plus dexpanthenol in nasal congestion

Aims  To compare the efficacy and tolerability of Oxymetazoline 0.05 % plus Dexpanthanol 5% versus Xylometazoline 0.1 % nasal drops in patients with nasal congestion due to allergic rhinitis and following nasal surgery. Methods  An investigator-blind, randomized, controlled, phase IV clinical trial conducted in 100 patients with acute allergic rhinitis or patients post-nasal surgery. Patients received either Oxymetazoline 0.05% with Dexpanthanol 5% (OD) or Xylometazoline 0.1% (XO) nasal drops. Results  Relief from nasal congestion was significantly better in the OD group then in the XO group (mean nasal scores 1.24 vs 1.86). Significantly more improvement in sneezing and decrease in nasal discharge was seen in the OD group than the XO group. Nasal irritation in the OD group was significantly less as compared to XO group (0.38 v/s 1.12 on second day and 0.10 vs 0.36 on the fourth day). The recovery time for OD group was 1.08 hours, which was significantly (46 min) lesser than that of the XO group. Rebound congestion was significantly less in OD as compared to XO group (6.25% vs 82.98%). 93.75% of the physicians in the OD group and 51.28% in XO group reported response to therapy as good to excellent. 95.83% patients in the OD group and only 52.91% patients in the XO group rated tolerability to therapy as good to excellent. Conclusion  Oxymetazoline and dexpanthenol combination has a better efficacy, shorter recovery time, causes lesser rebound congestion and has better tolerability than xylometazoline.     

Cochlear blood flow modifications induced by anaesthetic drugs in middle ear surgery: comparison between sevoflurane and propofol

OBJECTIVE: Because it is necessary to maintain controlled hypotension during middle ear surgery in order to avoid bleeding and as it is known that cochlear blood flow (CBF) is related to blood pressure (BP), it is useful to evaluate CBF modifications induced by anaesthetics in order to prevent cochlear damage. The aim of this paper is to evaluate, using laser Doppler flowmetry, which anaesthetic drug, out of sevoflurane and propofol, has the smallest effect on CBF. MATERIAL AND METHODS: Twenty consenting adult patients scheduled for myringoplasty under general anaesthesia for simple tympanic membrane perforation were studied. Patients were divided into two groups: the first group was treated with sevoflurane and the second with propofol. For the first group, CBF measurement was carried out on three different occasions: (i) at a basal low drug dosage; (ii) having increased the drug dosage to a higher level; and (iii) having reduced the drug dosage to the basal low level again. For the second group, CBF measurement was carried out on three different occasions: (i) 10 min after injecting a bolus of propofol; (ii) immediately after a second propofol injection; and (iii) 10 min after a third injection of propofol. A probe was placed over the promontory in order to measure CBF levels. RESULTS: In the subjects treated with sevoflurane, after having increased the drug dosage, BP decreased significantly while CBF did not change significantly. In the subjects treated with propofol we recorded a significant reduction in BP, as well as a decrease in CBF. CONCLUSION: The results obtained show that sevoflurane has a hypotensive effect without modifying CBF, while propofol, although having a similar effect on BP to sevoflurane, has less of a protective effect on inner ear microcirculation.     

Cochlear Blood Flow Modifications Induced by Anaesthetic Drugs in Middle Ear Surgery: Comparison Between Sevoflurane and Propofol

Objective --Because it is necessary to maintain controlled hypotension during middle ear surgery in order to avoid bleeding and as it is known that cochlear blood flow (CBF) is related to blood pressure (BP), it is useful to evaluate CBF modifications induced by anaesthetics in order to prevent cochlear damage. The aim of this paper is to evaluate, using laser Doppler flowmetry, which anaesthetic drug, out of sevoflurane and propofol, has the smallest effect on CBF. Material and Methods --Twenty consenting adult patients scheduled for myringoplasty under general anaesthesia for simple tympanic membrane perforation were studied. Patients were divided into two groups: the first group was treated with sevoflurane and the second with propofol. For the first group, CBF measurement was carried out on three different occasions: (i) at a basal low drug dosage; (ii) having increased the drug dosage to a higher level; and (iii) having reduced the drug dosage to the basal low level again. For the second group, CBF measurement was carried out on three different occasions: (i) 10 min after injecting a bolus of propofol; (ii) immediately after a second propofol injection; and (iii) 10 min after a third injection of propofol. A probe was placed over the promontory in order to measure CBF levels. Results --In the subjects treated with sevoflurane, after having increased the drug dosage, BP decreased significantly while CBF did not change significantly. In the subjects treated with propofol we recorded a significant reduction in BP, as well as a decrease in CBF. Conclusion --The results obtained show that sevoflurane has a hypotensive effect without modifying CBF, while propofol, although having a similar effect on BP to sevoflurane, has less of a protective effect on inner ear microcirculation.     

耳大神经阻滞对人工耳蜗植入术后患儿苏醒期谵妄的影响

目的 评价耳大神经阻滞对七氟烷全麻人工耳蜗植入术患儿苏醒期谵妄(ED)的影响。 方法 择期七氟烷全麻下单侧人工耳蜗植入术患儿80例,0~6岁,ASA分级Ⅰ~Ⅱ级。采用随机数字表法分为耳大神经阻滞组(A组)和对照组(B组)。麻醉诱导后,A组在超声引导下耳大神经周围注入0.2%罗哌卡因1 mL,B组在切口周围注射2%利多卡因2 mL。七氟烷维持麻醉。术后使用儿童麻醉苏醒期谵妄量表(PAED)评估ED发生率,使用面部、腿部、活动、哭泣和安慰程度量表(FLACC)评估术后疼痛。PAED≥13分或FLACC≥4分者,给予芬太尼0.5 μg/kg静脉注射。记录患儿七氟烷平均用药浓度、ED持续时间、拔管时间、麻醉后恢复室(PACU)停留时间、芬太尼总用药量、护士满意度评分和术后24 h内不良反应发生率。 结果 与B组比较,A组ED发生率(P=0.036)和PAED(P=0.024)评分降低,FLACC评分(P=0.008)和FLACC≥4分的比率(P=0.006)降低,芬太尼补救镇痛率(P=0.011)降低,PACU停留时间(P=0.040)缩短,护士满意度(P=0.021)得到改善(P均<0.05),PAED≥13分的比率(P=0.289)、ED持续时间(P=0.962)、拔管时间(P=0.913)和术后不良反应发生率(P呕吐=0.737;P呛咳=0.487;P低氧=1.000)差异无统计学意义(P均>0.05)。 结论 耳大神经阻滞能降低七氟烷全麻人工耳蜗植入术后儿童苏醒期谵妄的发生率、减轻术后疼痛且不增加术后不良反应发生率。     

The effects of 5-degree, 10-degree and 20-degree reverse Trendelenburg positions on intraoperative bleeding and postoperative Edemea and ecchymosis around the eye in open rhinoplasty

PurposeIn this study, we investigated the effect of reverse Trendelenburg position (RTP), with five, ten, and twenty degrees, on intraoperative bleeding and postoperative edema and ecchymosis around the eye in open rhinoplasty operations.Materials and methodsNinety patients undergoing open rhinoplasty were divided into three groups, 5° angle RTP (Group 5; n = 30), 10° angle RTP (Group 10; n = 30), and 20° angle RTP (Group 20; n = 30). After 3 min of preoxygenation, anesthesia was induced with 3 mg.kg^?1 propofol, 1 μg.kg^?1 fentanyl, and 0.6 mg/kg rocuronium for muscle relaxation. Maintenance of anesthesia was provided with a minimum alveolar concentration of 1–1.5 with sevoflurane, 1:1 O2/N2O. Hemodynamic variables, intraoperational bleeding, postoperative 1st, 3rd and 7th days ecchymosis and edema around the eyes of the patients were compared between the groups.ResultsEdema changes on postoperative 1st, 3rd and 7th days and ecchymosis changes around the eyes on postoperative 1st and 3rd days in Group 20 were found significantly lower than Group 5 (p < 0.017). Besides, the change of ecchymosis on the postoperative 1st day was found significantly lower in Group 20 compared to Group 10 (p < 0.017). The amount of intraoperative bleeding and surgical field evaluation score were found to be significantly lower in Group 10 and Group 20 compared to Group 5 (p < 0.017).ConclusionWe concluded that in open rhinoplasty surgeries, 20° degree RTP reduces intraoperative blood loss and provides a more bloodless surgical field, as well as reducing edema and ecchymoses around the eyes in the postoperative period.     

Effects of sevoflurane and TIVA with propofol on middle ear pressure

OBJECTIVE: To evaluate the effects of sevoflurane and TIVA with propofol on middle ear pressure and to show the importance of anesthesia without using any inhalational agents during middle ear surgery. STUDY DESIGN: A prospective, randomized controlled clinical study. METHODS: In this study, 25 male children that were scheduled for circumcision were randomised into two groups. Group I (n=13) received TIVA with propofol and group II (n=12) received sevoflurane. Baseline tympanometry reading was performed on each ear just before anesthesia. The next tympanometry reading was taken 10min after applying the laryngeal mask. Data were analysed by Mann-Whitney U (between groups) and Wilcoxon tests (within groups). RESULTS: Mean MEP values in 26 ears of 13 boys in group I did not show any significant difference before and after the anesthesia with propofol (p>0.05). In group II mean MEP values in 24 ears of 12 boys showed a significant increase after the anesthesia with sevoflurane (p<0.001). No significant difference was found between the MEP values of the two groups before the anesthesia (p>0.05), and MEP values measured during the anesthesia were significantly higher in group II (p=0.007). CONCLUSION: Sevoflurane may increase the middle ear pressure and TIVA with propofol may be used in middle ear operations more safely than sevoflurane.     

Prolonged recovery after out-patient pediatric adenotonsillectomy

Objective

To determine variables predictive of recovery room times in pediatric outpatient adenotonsillectomy.

Study design

Retrospective case-control.

Methods

One-hundred ninety consecutive patients undergoing outpatient adenotonsillectomy at an ambulatory surgery center of a tertiary-care free standing pediatric hospital were grouped into upper and lower deciles of recovery room times. Twenty-one variables were analyzed to determine which variables are predictive of prolonged recovery time. Univariate and multivariate analyses were performed.

Results

Of the 190 patients, mean recovery room time was 103 min (SD 53.1), 22 patients were in the lower decile (mean recovery room time of 63 ± 6 min) and 17 patients were in the upper decile (155 ± 40 min, P < 0.0001). Of the 21 variables analyzed, post-anesthesia care unit (PACU) nursing staff was the only significant predictor of prolonged recovery room time. Compared with one PACU nurse, other nurses (N = 5) predicted a longer recovery time (OR = 10.8, 95% CI 2.0-59.5, P = 0.0017). This association remained significant when controlling for anesthesiologist and surgeon (OR = 8.8, 95% CI 1.5-50.9, P = 0.0072). There were no complications in any patients.

Conclusions

Recovery room times after outpatient adenotonsillectomy vary significantly (mean 103 min (SD 53.1), range 50-241 min). Of potential predictors, only the human factor (PACU nursing staff) was associated with prolonged recovery room times, independent of surgeon and anesthesiologist. Development of standardized protocols for nurses to use for discharge has the potential to increase throughput for adenotonsillectomy patients in an outpatient surgery center setting.     

精神病患者白内障手术的麻醉处理

目的 探讨丙泊酚在精神病患者白内障手术麻醉中的应用。方法 2006年6月至2012年7月行白内障手术的精神病患者15例(18眼),入手术室后立即给予鼻导管吸氧,建立静脉通路,连续监测ECG、HR、BP、SpO2、PetCO2、BIS。丙泊酚1~2mg/kg微量泵静脉注射,当BIS值在60以下时开始手术。术中丙泊酚2~5mg/(kg·h)持续微量泵静脉注射维持麻醉,因疼痛体动者静脉注射芬太尼20~50μg, BIS值维持在40~60。手术结束停止泵注丙泊酚。结果 15例患者均顺利完成手术。其中2例出现一过性呼吸抑制,SpO2在正常范围,减少丙泊酚用量后好转,未予特殊处理。余13例均未出现麻醉相关并发症。术后随访未发现麻醉后遗症或精神病病情加重。结论 丙泊酚可以满足精神病患者白内障手术的需求;同时要做好术前访视、术中监护及术后管理工作,使患者安全度过围手术期。     

Tubeless anaesthesia with sevoflurane and propofol in adult laryngeal surgery

The presence of endotracheal intubation tube or jet ventilation cannula can compromise free view and access to operation area in certain endolaryngeal operations. The objective of this prospective study was to test whether adequate level of anaesthesia could be obtained in adults using tubeless sevoflurane inhalation anaesthesia with spontaneous breathing. In 23 ASA 1–2 patients, 31 treatments were included in the study of which 19 were laser-assisted papilloma or other tumour resections and 12 were fascia injection laryngoplasties. Anaesthesia was induced with propofol and maintained by insufflating sevoflurane mixture to the patient’s oropharynx. The adequacy of the anaesthesia level was assessed by monitoring bispectral index, haemodynamic parameters and peripheral oxygen saturation during the anaesthesia. The ENT surgeon estimated operating conditions, whilst the two participating anaesthesiologists assessed the quality of anaesthesia using a 100 mm VAS scale. Sevoflurane contamination in the operating theatre was measured during five treatments. Mean bispectral index was below 40 throughout the operation. Haemodynamic parameters showed only minor changes during the anaesthesia. Both attending anaesthesiologists and operating ENT surgeon were satisfied with the quality of the anaesthesia and operating conditions (VAS 83 ± 15, mean ± SD, range 42–100, and VAS 93 ± 10, range 55–100, respectively). Sevoflurane room air contamination was high in most measured cases. The modification of tubeless inhalation anaesthesia used in this study produced adequate level of anaesthesia with stable haemodynamics and good operating conditions. Sevoflurane contamination can be reduced with more efficient scavenging systems.     

Clinical analysis of delayed epistaxis following endoscopic sinus surgery

ObjectiveTo investigate the clinical characteristics and treatment methods associated with delayed epistaxis following endoscopic sinus surgery.MethodsThe clinical data of 46 patients with delayed epistaxis following endoscopic sinus surgery were retrospectively analyzed. To explore the clinical features, pathogenesis, and treatment plan for delayed epistaxis, the postoperative bleeding time, bleeding inducements, systemic complications, surgical approach, the hemorrhage locations and responsible vessels, and treatment methods were analyzed.ResultsThe average bleeding time was 16.34 ± 9.05 days after the operation, and 76.6% of the cases occurred 6–20 days after the operation. Sphenopalatal artery hemorrhage accounted for 69.6% (32/46), the most common of which was a posterior nasal septal artery hemorrhage (17/32). A total of 45 patients received endoscopic low-temperature plasma hemostasis following ineffective nasal packing, and no rebleeding in the ipsilateral nasal cavity was observed during the postoperative follow-up for 3 to 6 months.ConclusionsThe peak of hemorrhaging in delayed epistaxis following endoscopic sinus surgery occurred at 6–20 days post-operatively. Bleeding of the posterior nasal septal artery from the sphenopalatine artery was the most common. Surgical methods were closely related to delayed postoperative hemorrhage. Treatment with low temperature plasma hemostasis under nasal endoscope was found to be effective.     

Primary endoscopic stapedotomy using 3 mm nasal endoscope: Audiologic and clinical outcomes

ObjectiveTo report the use of a 3 mm rigid nasal endoscope in primary endoscopic stapedotomy and clinical and audiological outcomes.Materials and methodsThirty patients diagnosed with primary otosclerosis underwent endoscopic stapedotomy that was performed using a 3 mm nasal endoscope (Karl Storz). At 6 months follow-up, the patients were evaluated for intraoperative findings, postoperative hearing outcomes and complications.ResultsCanaloplasty was performed in 2 (6.66%) patients, and no curettage of the canal wall was required in 12 (40%) patients. Transposition of the chorda tympani nerve was conducted in 11 (36.66%) patients. The average duration of surgery was 36 min (range 31–65 min). The air-bone gap (ABG) was 35 dB (range 24–50 dB) preoperatively and 14.63 dB (range 9–20 dB) postoperatively (p = 0.00). At 6 months follow-up, <20 dB ABG was achieved in 93.33% of the patients. No major intraoperative/postoperative complications were detected.ConclusionA 3 mm rigid nasal endoscope can be effectively used in stapedotomy to obtain adequate audiological outcomes. It can be considered as a better alternative to the standard microscope or 4 mm endoscope in preserving the posterior canal wall and chorda tympani nerve while minimizing operative time without causing significant complications.     

Quantitative determination of protein, albumin, and antibiotics in nasal secretions of healthy probands (author's transl)

This study on the pharmacokinetics of antibiotics in nasal secretions was carried out with two orally applicable penicillin derivatives which show different resorption patterns. Each of the antibiotics (Ampicillin and Bacampicillin) was given in equimolar doses to 20 healthy young volunteers, with normal mucosa, in a double blind cross over fashion. Nasal secretions were collected 1, 2, 3, 4, 6, and 8 h after the application of a single dose to the overnight fasted persons. In 10 of them blood was taken at 0.5, 1, 1.5, 2, 3, and 4 h after the administration. For the sampling of the nasal secretions cotton wool was weighed together with an airtight vial containing 300 microliter of phosphate buffered saline (PBS). The dry cotton wool stayed in the nasal cavity for 20 min, was then put into the PBS and weighed again. The difference determines the amount of secretions collected. After 30 min the soaked cotton wool was pressed out into a vial with a sterile syringe. One hundred microliters of this solution was taken to determine the antibiotic concentration by a micromodification of the agar diffusion technique. In the remaining fluid total protein and albumin were quantitatively determined. The amount of nasal secretions which have been collected are, on average, independent of the time (Fig. 1). With rising secretion the protein content decreases (Fig. 5) as is the case with the albumin concentration. Regarding all persons, the protein content and albumin (Fig. 4) remain constant during the experiment from 8 a.m. to 4 p.m. The differences between the values shown in the figures are not significant. Comparing the mean concentration for the antibiotic at different times after the application, it is obvious that the agents show different curves (Fig. 6). With ampicillin the maximum of 0.13 microgram/ml is reached at 2 h after the administration whereas with becampicillin the maximum of 0.84 microgram/ml is reached after 1 h. The concentrations in the nasal secretions are clearly dependent of the serum values. In the serum the maximum of the mean values plotted against the time of 2.7 microgram/ml is to be found at 2 h, if ampicillin is given, whereas the maximum of 9.3 microgram/ml is reached at 1 h after bacampicillin administration. In both cases in serum and nasal secretions the mean concentration maximum is about three times higher after bacampicillin as compared with ampicillin. As a reference for the concentration of the antibiotic the total protein content of the sample is more suitable as compared with sample volume and albumin because of its easy and exact determination. The results show that the nasal secretions can be used as a model to evaluate the pharmacokinetics in the mucosa of the upper respiratory tract if an adequate number of test persons is used.     

可乐定对术后恢复室患者的影响

目的 研究可乐定对术后恢复室患者血流动力学及血浆儿茶酚胺的影响.方法 28例择期改良悬雍垂腭咽成形术并留置气管导管入术后恢复室过夜观察的重症阻塞性睡眠呼吸暂停低通气综合征患者28例,随机分为两组,两组患者采用相同方案镇痛镇静治疗,可乐定组14例,入恢复室后预先缓慢静脉注射3 μg/kg可乐定,对照组14例,无预先处理.当出现血压增高和/或心率增快,以血管活性药物进行调整.观察两组血流动力学改变,并记录血管活性药物的用量.分别于术前、入恢复室两小时、出恢复室前采集动脉血测定并比较两组血浆儿茶酚胺水平.结果 可乐定组血流动力学较对照组明显稳定,血管活性药物用量明显少于对照组(P＜0.05).入恢复室两小时及出恢复室前可乐定组病例血浆儿茶酚胺水平明显低于对照组(P＜0.05).结论 可乐定用于恢复室控制血流动力学变化效果较好,并能降低患者应激激素的水平,利于患者术后的恢复.     

Influence of anaesthetic agents on transient evoked otoacoustic emissions and stapedius reflex thresholds

This aim of this study was to determine the effect of anaesthetic agents on stapedius reflex (SR) thresholds and transient evoked otoacoustic emissions (TEOAE). Fifty patients who were scheduled for operation and who had normal hearing were included in the study. All were given midazolam for premedication and propofol for induction. Anaesthesia was maintained in five different ways in each group of 10 patients. Groups I-IV received inhalational anaesthesia: group I received 70 per cent N2O plus 30 per cent O2, group II sevoflurane, group III desflurane and group IV halothane. Group V received total intravenous anaesthesia with propofol plus sufentanil. The SR and TEOAE of the patients were measured four times: on the day before surgery (first measurement), after premedication (second measurement), after induction of anaesthesia (third measurement) and during maintenance of anaesthesia (fourth measurement). Midazolam significantly increased ipsilateral and contralateral SR thresholds and decreased TEOAE wave reproducibility. Propofol significantly increased only the SR thresholds. The other anaesthetic agents significantly increased only the contralateral reflex thresholds. Of these, the highest increase was seen after sevoflurane and the lowest after halothane. The changes in TEOAE wave reproducibility due to anaesthetic agents used for maintenance were not significant. We concluded that midazolam premedication may affect audiological evaluation with SR and TEOAE tests, and sevoflurane should not be used when it is necessary to measure SR under general anaesthesia.     

The efficacy of nasal surgery in obstructive sleep apnea syndrome: a prospective clinical study

The aim of this study was to investigate the effects of surgical intervention for nasal pathologies on obstructive sleep apnea syndrome (OSAS) and continuous positive airway pressure (CPAP) titrations in patients with OSAS. The study was designed as a prospective case control study. Between December 2007 and June 2010, 31 patients (26 men and 5 women) who were diagnosed with OSAS with polysomnography and confirmed to have obstructive nasal pathology were enrolled in the study. The average age of the patients was 53 ± 9.6 (range 33–68 years) and the body mass index ranged from 22 to 40.6 kg/m² with an average of 30.3 ± 4.1. The patients were evaluated with Epworth Sleepiness Scale, OSAS Complaints Questionnaire, visual analog scale, and CPAP titration before and 3 months after nasal surgery. As three patients did not attend the control polysomnography, data analysis was performed on 28 patients. Although there was a significant improvement in the nasal passage and subjective complaints, namely, snoring frequency, apnea and daytime sleepiness, the difference between preoperative and postoperative AHI values was not statistically significant. Postoperative CPAP titration results indicated a decrease both in pressures and in AHI in comparison to preoperative values. These reductions were not statistically significant, although the decrease in CPAP pressures was close to significance (p = 0.062). Nasal pathologies should be treated in all patients with OSAS, particularly those undergoing CPAP treatment. However, patients should be counseled that favorable results might not be achieved after nasal surgery.