Quality and patient safety in anesthesia service: Thai survey.

Background: The Royal College of Anesthesiologists of Thailand (RCAT) performed large-scale epidemiologic study of anesthesia-related complications and national incidents study in 2004 and 2007, respectively. Objectives: Evaluate the anesthesia service in Thailand with regard to status of quality and patient safety. Material and methods: A pre-planned structured questionnaire regarding demographic, administrative, preanesthetic, intraoperative postanesthetic variables and complications were requested to be filled in by nurse anesthetists attending the refresher course lecture of RCAT in February 2008. Descriptive statistics was used. Results: Three hundred fifty questionnaires were given and 341 respondents (97%) returned the questionnaires. Most of the respondents (90%) worked in government section. Thirty percent of respondents practiced in hospital without medical doctor anesthesiologist and 58% of nurse anesthetists worked in hospitals that have been accredited. Forty-six percent of respondents reported unavailability of a 24-hour recovery room. The questionnaires revealed of inadequacy of anesthesia personnel (64%), inadequate supervision during emergency condition (53%), inadequacy of patient information regarding anesthesia (57-69%), and low opportunity for patient to choose choice of anesthesia (19%). The commonly used monitoring were pulse oximeter (92% of respondents) and electrocardiography (63%). One-third (32%) of respondents had to provide of anesthesia for patients with insufficient NPO (non per oral) time. Common problems that the respondents experienced were miscommunication (49%), intraoperative cardiac arrest during the past year (35%), error related to infusion pump (24%) and medication error (8%). Fifty-five percent of respondents had to monitor at least one patient per month receiving spinal anesthesia. Conclusion: Suggested strategies for quality and patient safety improvement in anesthesia service are increasing personnel, increasing 24-hour recovery room, improvement of supervision, improvement of communication, compliance to guidelines and improvement of nurse anesthetist’s training regarding monitoring patient receiving spinal anesthesia and cardiopulmonary resuscitation.

Anesthesia-related cardiac arrest in children: the Thai Anesthesia Incidents Study (THAI Study).

BACKGROUND AND OBJECTIVE: The Thai Anesthesia Incidents study (THAI Study) is the first national study of anesthesia outcomes during anesthesia practice in Thailand. The authors extracted data of 25,098 pediatric cases from the THAI Study in order to examine the incidence, suspected causes, contributory factors, and suggested corrective strategies associated with anesthesia-related cardiac arrest. MATERIAL AND METHOD: A multi-centered prospective descriptive study was conducted among 20 hospitals across Thailand over a year between March 1, 2003 and February 28, 2004. Data of cardiac arrests in children aged 15 years and younger were collected during anesthesia, in the recovery room and 24 hours postoperative period, and reviewed independently by at least two reviewers. RESULTS: Incidence of anesthesia- related cardiac arrest was 5.1 per 10,000 anesthetics, with 46% mortality rate. Infants accounted for 61% of cases. Incidences of overall cardiac arrest and anesthesia-related arrest were significantly higher in infants than older children and in children with ASA physical status 3-5 than those with ASA physical status 1-2. Most of the anesthesia-related arrests occurred in the operating room (61%) during induction or maintenance of anesthesia (84%). Respiratory-related cardiac arrest was the most common suspected cause of anesthesia-related cardiac arrest. Improving supervision, additional training, practice guidelines, efficient blood bank, equipment maintenance, and quality assurance monitoring are suggested corrective strategies to improve the quality of care in pediatric anesthesia. CONCLUSION: The incidence of anesthesia-related cardiac arrest was 5.1:10,000 anesthetics. Major risk factors were children younger than 1 year of age and ASA 3-5. The identifications of airway management and medication-related problems as the main causes of anesthesia-related cardiac arrest have important implications for preventive strategies.

Factors related to intraoperative oxygen desaturation in geriatric patients in a Thai university hospital.

BACKGROUND: As a site of the Thai Anesthesia Incidents Study (THAI Study) of anesthetic adverse outcome, the authors continued the institutional data collection to determine the incidence of intraoperative oxygen desaturation of geriatric patients (age 65 years and over) and relative factors representing a Thai university hospital. MATERIAL AND METHOD: Between July 1, 2003 and March 31, 2007, an anesthesia registry was conducted at King Chulalongkorn Memorial Hospital. Anesthesiologists and anesthesia residents were requested to record perioperative variables and adverse outcomes including oxygen desaturation (SpO2 < or = 90% for 3 minutes or SpO2 < 85%) on a structured data record form. Univariable analysis was used to identify factors related to intraoperative oxygen desaturation. Multivariable generalized linear regression for risk ratio was used to investigate independent factors with significant association to intraoperative oxygen desaturation. A forward stepwise algorithm was chosen. A p-value < 0.05 was considered as statistically significant. RESULTS: Among 54,419 cases in the registry, 8,905 geriatric patients underwent non-cardiac surgery receiving anesthesia. Among these, 21 patients developed intraoperative oxygen desaturation with an incidence of 23.6 (95% CI 10, 30):10000 anesthetics. Variables that predict intraoperative oxygen desaturation by multivariable analysis were ASA physical status 3 [RR 4.6 (95% CI 1.6, 13.6)], ASA physical status 4-5 [RR 29.8 (95% CI 8.7, 102.8)], history of difficult airway [RR 13.1 (95% CI 1.7, 102.2)], recent respiratory failure [RR 6.0 (95% CI 1.2, 29.3)], and anesthetic agents used such as: pethidine [RR 6.2 (95% CI 1.9, 19.9)], and ketamine [RR 5.6 (95% CI 1.2, 25.9)]. CONCLUSION: The incidence of intraoperative oxygen desaturation of geriatric patients who underwent non-cardiac surgery in a Thai university hospital was 23.6:10000 anesthetics, which was comparable to others. The higher ASA physical status, history of difficult intubation and recent respiratory failure were risk factors of intraoperative oxygen desaturation. Pre-anesthetic evaluation particularly airway evaluation and identification of high-risk patients are crucial for prevention of oxygen desaturation.

Factors related to 24-hour perioperative cardiac arrest in geriatric patients in a Thai university hospital.

BACKGROUND: As a site of the Thai Anesthesia Incidents Study (THAI Study) of anesthetic adverse outcome, the authors continued the institutional data collection to determine the incidence and factors related to 24-hour perioperative cardiac arrest in geriatric patients (aged 65 years and over) representing a Thai university hospital. MATERIAL AND METHOD: Between July 1, 2003 and March 31, 2007, an anesthesia registry was conducted at King Chulalongkorn Memorial Hospital. Anesthesiologists and anesthesia residents were requested to record perioperative variables and adverse outcomes including 24-hour perioperative cardiac arrest on a structural data record form. Univariable analysis was used to identify factors related to 24-hour perioperative cardiac arrest. A multivariable generalized linear regression for risk ratio was used to investigate independent factors with significant association to 24-hour perioperative cardiac arrest. A forward stepwise algorithm was chosen. A p-value < 0.05 was considered as statistically significant. RESULTS: Among 54,419 cases in the registry, 8,905 geriatric patients underwent a non-cardiac surgery under anesthesia. Thirty-six patients experienced cardiac arrest. The incidence of intra-operative cardiac arrest, within 24 hours postoperative cardiac arrest, and overall 24-hours perioperative cardiac arrest were 18:10000 (mortality rate of 62.5%), 22.5:10000 (mortality rate of 90%), and 40.4:10000 (mortality rate of 77.8%), respectively. By multivariable analysis, age of 76-85 [RR 2.6 (95% CI: 1.2,5.4)], age > or = 86 [RR 4.4 (95% CI: 1.7, 11.8)], recent respiratory failure [RR 6.6 (95% CI: 1.9, 22.3)], ASA physical status 3-5 [RR 19.9 (95% CI: 4.6, 86)], emergency surgery [RR 2.8 (95% CI: 1.4, 5.6)], intrathoracic surgery [RR 3.7 (95% CI: 1.4, 9.9)], upper abdominal surgery [RR 2.8 (95% CI: 1.3, 5.7)], and administration of ketamine [RR 5.4 (95%CI: 1.8, 15.9)] were factors related to 24-hour perioperative cardiac arrest. CONCLUSION: The incidence of 24-hourperioperative cardiac arrest of geriatric patients in a Thai university in the present study was 40.4:10000 anesthetics, which was comparable to others with high mortality rate. Risk factors for 24-hour perioperative cardiac arrest were older age, ASA physical status 3-5, emergency surgery, intrathoracic surgery, upper abdominal surgery, recent respiratory failure, and administration of ketamine. Pre-anesthetic evaluation is important for finding the risks and optimal preparation for preventing perioperative cardiac arrest in these aging patients.

Multicentered study of model of difficult endotracheal intubation by incident reports from university and non-university hospitals.

OBJECTIVE: To compare the characteristics, causative factors, outcomes, prevention, and suggested preventive strategies of difficult intubation between university (U) and general community (non-U) hospitals. MATERIAL AND METHOD: One thousand nine hundred and ninety-six reports were reviewed from Thai anesthesia incident monitoring study (Thai AIMS) conducted in 51 hospitals nationwide between January and June 2007. Thirty-four cases ofDI were reported from U hospitals and 69 cases from non-U hospitals. The described details on each report on dfficult intubation (DI) in adults undergoing general anesthesia were thoroughly reviewed by three reviewers to give their consensus opinions on causative factors, outcomes, contributing preventive factors, and strategies for corrections. Descriptive statistics were used for data analysis. RESULTS: Patient factors were the most common cause of DI (88% in U and 87% in non-U hospitals). Fifty percent of U and 51% of non-U DI cases were consequences of human errors, which were preventable and mostly based on knowledge (88% vs. 71%) and rules of practice (23% vs. 51%). Substitution of an intubating anesthesiologist, reducing the size of endotracheal tubes, and stylet guided technique were the three commonly used methods after DI. MacCoy laryngoscope, fiber optic-aided intubation, laryngeal mask airway and Frova introducer were commonly used as substitutes for the standard laryngoscope. Inadequate experience was the major problem of U hospitals, which required additional training to gain more skill. The most common problem ofDI in non-U hospitals was inadequate preanesthetic evaluation. Therefore, they required practice guidelines and experienced assistants in difFicult situations. CONCLUSION: Half of DI cases were preventable. DI cases in Non-U hospitals were mostly caused by inadequate preanesthetic evaluation. This indicates the necessities of providing practice guidelines and experienced assistants. In U hospitals, in-training practice of intubation should be performed under supervision. More advanced substitution techniques were applicable in U hospitals.

Incidence and risk factors of emergence agitation in pediatric patients after general anesthesia.

OBJECTIVE: To study the incidence and evaluate factors associated with emergence agitation (EA) in pediatrics after general anesthesia. MATERIAL AND METHOD: A prospective observational study was conducted in 250 pediatric patients aged 2-9 years, who received general anesthesia for various operative procedures in Maharaj Nakorn Chiang Mai Hospital between October 2006 and September 2007. The incidence of EA was assessed Difficult parental-separation behavior, pharmacologic and non-pharmacologic interventions, and adverse events were also recorded Univariate and multivariate analysis were used to determine the factors associated with EA. A p-value of less than 0.05 was considered significant. RESULTS: One hundred and eight children (43.2%) had EA, with an average duration of 9.6 +/- 6.8 minutes. EA associated with adverse events occurred in 32 agitated children (29.6%). From univariate analysis, factors associated with EA were difficult parental-separation behavior, preschool age (2-5 years), and general anesthesia with sevoflurane. However; difficult parental-separation behavior; and preschool age were the only factors significantly associated with EA in the multiple logistic regression analysis with OR = 3.021 (95% CI = 1.680, 5.431, p < 0.001) and OR = 1.857 (95% CI = 1.075, 3.206, p = 0.026), respectively. CONCLUSION: The present study indicated that the incidence of EA was high in PACU. Preschool children and difficult parental-separation behavior were the predictive factors of agitation on emergence. Therefore, anesthesia personnel responsible for pediatric anesthesia should have essential skills and knowledge to effectively care for children before, during, and after an operation, including implementing the methods that minimize incidence of EA.

Multicentered study of model of anesthesia related adverse events in Thailand by incident report (The Thai Anesthesia Incidents Monitoring Study): results.

OBJECTIVE: The Thai Anesthesia Incidents Monitoring Study (Thai AIMS) was aimed to identify and analyze anesthesia incidents in order to find out the frequency distribution, clinical courses, management of incidents, and investigation of model appropriate for possible corrective strategies. MATERIAL AND METHOD: Fifty-one hospitals (comprising of university, military, regional, general, and district hospitals across Thailand) participated in the present study. Each hospital was invited to report, on an anonymous and voluntary basis, any unintended anesthesia incident during six months (January to June 2007). A standardized incident report form was developed in order to fill in what, where, when, how, and why it happened in both the close-end and open-end questionnaire. Each incident report was reviewed by three reviewers. Any disagreement was discussed and judged to achieve a consensus. RESULTS: Among 1996 incident reports and 2537 incidents, there were more male (55%) than female (45%) patients with ASA PS 1, 2, 3, 4, and 5 = 22%, 36%, 24%, 11%, and 7%, respectively. Surgical specialties that posed high risk of incidents were neurosurgical, otorhino-laryngological, urological, and cardiac surgery. Common places where incidents occurred were operating room (61%), ward (10%), and recovery room (9%). Common occurred incidents were arrhythmia needing treatment (25%), desaturation (24%), death within 24 hr (20%), cardiac arrest (14%), reintubation (10%), difficult intubation (8%), esophageal intubation (5%), equipment failure (5%), and drug error (4%) etc. Monitors that first detected incidents were EKG (46%), Pulse oximeter (34%), noninvasive blood pressure (12%), capnometry (4%), and mean arterial pressure (1%). CONCLUSION: Common factors related to incidents were inexperience, lack of vigilance, inadequate preanesthetic evaluation, inappropriate decision, emergency condition, haste, inadequate supervision, and ineffective communication. Suggested corrective strategies were quality assurance activity, clinical practice guideline, improvement of supervision, additional training, improvement of communication, and an increase in personnel.

The Thai Anesthesia Incidents Study (THAI study) of ambulatory anesthesia: II. Anesthetic profiles and adverse events.

BACKGROUND: There is a continuing trend to have more elective surgery performed on an outpatient basis. OBJECTIVE: To determine anesthetic profiles and adverse events in practice of ambulatory anesthesia for elective surgery in different levels of hospitals across Thailand. MATERIAL AND METHOD: A prospective descriptive study was conducted in 20 hospitals comprising seven university, five regional four general and four district hospitals across Thailand. Consecutive patients undergoing anesthesia for elective surgery were included. The included patients, classified as outpatients, were selected and extracted for summary of the result by using descriptive statistics. RESULTS: The authors reported 7786 outpatients receiving anesthesia for elective surgery. The majority of patients were in ASA class 1 and 2 (96.2%) while the rest were in ASA class 3 (3.8%). Nearly 90% of the ASA class 3 patients were in university hospitals. The majority of patients (83.1%) did not receive premedication. Diazepam was used more frequently (11.5% vs. 0.1%) than other drugs. Noninvasive blood pressure monitoring and pulse oximetry were used in greater than 90%, while electrocardiogram (EKG) was used in 67.2% and end tidal CO2 in only 6.8%. The three most common anesthetic techniques were general anesthesia (including inhalation anesthetics), total intravenous anesthesia (TIVA), and monitored anesthesia care (MAC). Regional anesthesia was performed in 12% of cases. The three most common regional anesthetic techniques were brachial plexus block (7.1%), spinal anesthesia (2.21%), and other peripheral nerve blocks (2.06%). Propofol was the most common drug for induction. Succinylcholine was used for intubation in 8.8%. The three most common nondepolaring neuromuscular blocking agents were atracurium, cisatracurium, and vecuronium. Fentanyl was the most common drug used among opioids. The three most common volatile anesthetics were sevoflurane, halothane, and isolurane. Lidocaine was the most frequently used in 29.76% of cases, while bupivacaine in 7.9% and ropivacaine only in 0.05%. The majority of the events relating to respiratory system were hypoxia or oxygen desaturation (18:10,000), reintubation (2.6:10,000) and difficult intubation (2.6:10,000), pulmonary aspiration (2.6:10,000), and esophageal intubation (1.3:10,000). Other adverse events included awareness (1.3:10,000), suspected myocardial infarction or ischemia (1.3:10,000), and drug error (1.3:10,000). Five patients (0.06%) received unplanned hospital admission. No patients developed cardiac arrest or died. CONCLUSION: The incidence of major adverse events was low in ambulatory anesthesia for elective surgery when compared to the incidence in general surgical population. The majority of the events occurred in the respiratory system. The authors did not find any complications relating to regional anesthesia. Despite a low incidence of adverse events in ambulatory anesthesia, anesthesia personnel who are responsible for ambulatory anesthesia should have adequate knowledge and skills in selection and preparation of the patients. Therefore, a system of preanesthesia evaluation is very important.

Multicentered study of model of anesthesia related adverse events in Thailand by incident report (the Thai Anesthesia Incident Monitoring Study): methodology.

OBJECTIVE: Determine the appropriate model for incident study of adverse or undesirable events in more extensive levels from primary to tertiary hospitals across Thailand. MATERIAL AND METHOD: The present study was mainly a qualitative research design. Participating anesthesia providers are asked to report, on anonymous and voluntary basis, by completing the standardized incident report form as soon as they find a predetermined adverse or undesirable event during anesthesia, and until 24 hours after the operation. Data from the incident report will be reviewed by three peer reviewers and analyzed to identify contributing factors by consensus. CONCLUSION: The THAI anesthesia incidents monitoring study can be used as a model for the development of a local system to provide review and feedback information. This should help generate real improvement in the patient care.

Risk factors of intraoperative oxygen desaturation: a case-control study of 152,314 anesthetics.

BACKGROUND: The present study was part of the Thai Anesthesia Incidents Study (THAI Study) of anesthetic adverse outcomes. OBJECTIVE: To determine factors related to intraoperative oxygen desaturation (SpO2 < or =85% or < 90% for more than 3 min). MATERIAL AND METHOD: During a 12-month period (February 1, 2003 - January 31, 2004), a prospective multicentered registry of patients receiving anesthesia was conducted in 20 hospitals across Thailand Anesthesia personnel filled up patient-related, surgical-related, and anesthesia related variables and adverse outcomes including intraoperative oxygen desaturation. A case-control (1:4) study of patients with and without intraoperative oxygen desaturation in the THAI Study database was done. Univariate and multivariate analysis were used to identify factors related to intraoperative oxygen desaturation. A p-value < 0.05 was considered as significant. RESULTS: Among 152,314 patients without preanesthetic desaturation in the database, 328 cases of intraoperative oxygen desaturation were matched with 1312 control patients without desaturation. Variables that predict desaturation by multiple logistic regression were age less than 5 years old [OR 9.3 (95% CI 5.4-16.0)], ASA physical status 3, 4, 5 [OR 3.1 (95% CI 2.2-4.3)], history of upper respiratory tract infection [OR 10 (95% CI 1.9-51.6)], history of asthma [OR 2.9 (95% CI 1.0-9.5)], general anesthesia [OR 4.0 (95% CI 2.4-6.7)] duration of anesthesia 31-90 min [OR 1.9 (95% CI 1.2-3.0)], duration of anesthesia 91-150 min (OR 2.2 (95% CI 1.3-3.6)], and duration of anesthesia >150 min [OR 2.0 (95% CI 1.2-3.4)]. CONCLUSION: Knowing the risk factors of intraoperative oxygen desaturation helps improving personnel to improve preanesthetic conditions and facilitate early detection as well as prompt treatment of intraoperative oxygen desaturation.

A survey of awareness, opinion and reported use of clinical practice guidelines (CPG) of the Royal College of Anesthesiologists of Thailand.

BACKGROUND: Up to the present (2006), The Royal College of Anesthesiologists of Thailand (RCAT) has proposed and revised six practice guidelines. For guidelines to achieve their objectives, anyone who gets involved needs to be aware of the guidelines, be able to accept, and adhere to them. Although the authors did introduce their guidelines by several passive means, the authors have not yet ascertained what the result were. OBJECTIVE: The primary objective of the present study was to assess awareness, opinion, limitation, and reported use of guidelines. The secondary objective was to identify factors associated with variation, agreement, and reported use of guidelines. MATERIAL AND METHOD: A cross sectional, self-report survey study was conducted. An anonymous questionnaire including prepaid-addressed reply envelopes was mailed to 600 anesthesiologists and 1,300 nurse anesthetists, nationwide, based on the college's list. The questions covered respondents' general characteristics: awareness, agreement, and reported use of the existing guidelines; opinion on implementation media, which guidelines the members need, their local guidelines, and the impact of guidelines on their practice. All data were extracted and reported using descriptive statistics. Multiple logistic regression was done to identify factors associated with an agreement with and a reported use of the guidelines. RESULTS: The overall response rate was 33.4% and nurse anesthetists had a higher response than anesthesiologists. Forty-six percent of the respondents were aware of the existing guidelines. This result corresponded to percentage of those who had read the guidelines (41%). Among the six existing guidelines, the least two guidelines reported use of and agreement with, were those for labor analgesia and conscious sedation (23-28%, 24-28%). The guidelines for spinal anesthesia received the most response (46%). For respondents who had read the guidelines, most of them (80% to 94%) rated the level of agreement and reported use as good to excellent. The respondents also rated the announcement of the guidelines during the annual meeting of the Royal College of Anesthesiologists of Thailand as the best implementation strategy. Impracticability, inadequate dissemination, and un-cooperation among colleagues were the three most important obstacles of using the guidelines. In addition, the present study demonstrated three significant factors, anesthesiologists, regional hospitals, and general hospitals, as associated with reporting frequent use of and high agreement with the guidelines. CONCLUSION: The low level of awareness and reported use of the present guidelines among the members reflects poor implementation and dissemination. However the present study reveals some information that will guide the authors to introduce intensive and targeted interventions to encourage the members to comply and adhere to the guidelines designed to improve the quality of patients' care.

The Thai Anesthesia Incidents Study (THAI Study) of ambulatory anesthesia: Part I: Method, geographic distribution and population.

BACKGROUND: There is a continuing trend to have more elective surgical operations performed on an outpatient basis. OBJECTIVE: To determine the proportional distribution of anesthetic procedures performed in ambulatory elective surgery at different levels of hospitals across Thailand. MATERIAL AND METHOD: A prospective and descriptive study was conducted at 20 hospitals comprising seven universities, five regional, four general and four district hospitals across Thailand Consecutive outpatients who were undergoing elective surgical operation were included and their relevant data were selected and extracted for summary by using descriptive statistics. RESULTS: From the database of 118,027 anesthetics performed for elective surgical operation, 7,786 (6.6%) were outpatients. According to this, 7,016 (90.1%) were practiced in university hospitals, 656 (8.4%) in regional or tertiary hospitals, 71 (9%) in general or provincial hospitals, and 43 (0.6%) in district hospitals. The frequency of the ambulatory anesthesia was higher in hospitals in the central region, especially in university hospitals in Bangkok than in other regions. The majority of cases (86%) received their initial pre-anesthetic evaluation in the operating room while 12% were evaluated at the outpatient office. About 28% of the cases presented with pre-anesthetic abnormal conditions. The relatively common pre-anesthetic diseases were hypertension, diabetes mellitus, anemia, arrhythmia, and asthma. CONCLUSION: From the results of the present study, the authors have concluded that the rate of expansion of ambulatory anesthesia in Thailand is relatively slow, and varies according to the type of hospital and its geographic region. This indicates further studies should be formally conducted to determine factors affecting the practice of ambulatory surgery in Thailand. A large proportion of patients receive initial pre-anesthetic evaluation in the operating room on the day of surgery. This indicates that a system of pre-anesthetic evaluation should be set up for outpatients such as a pre-anesthetic care clinic should be set up for outpatients.

The Thai Anesthesia Incidents Study (THAI study) of morbidity after spinal anesthesia: a multi-centered registry of 40,271 anesthetics.

BACKGROUND: The present study was part of the Thai Anesthesia Incidents Study (THAI Study) of anesthetic adverse outcomes. OBJECTIVE: Study complications after spinal anesthesia. MATERIAL AND METHOD: During the 12 month period (March 1, 2003 - February 28, 2004), a prospective multicentered descriptive study was conducted in 20 hospitals comprised of seven university, five tertiary, four general and four district hospitals across Thailand Anesthesia personnel filled up patient-related, surgical-related, and anesthesia-related variables and adverse outcomes of all consecutive patients receiving anesthesia on a structured data entry form. The data were collected during pre-anesthetic, intra-operative, and 24 hr post operative period Adverse event specific forms were used to record when these incidents occurred. Data were reviewed by three independent reviewers and analyzed to identify contributing factors by consensus. RESULTS: This was registry of 40,271 spinal anesthetics from 172,697 anesthetics. The incidence of total spinal anesthesia, neurological complications, suspected myocardial ischemia, or infarction and oxygen desaturation per 10000 spinal anesthetics were 3.48 (95% CI 1.66-5.30), 1.49 (95% CI 0.30-2.68), 2.73 (95% CI 1.12-4.35), 0.99 (95% CI 0.39-2.56), and 6.46 (95% CI 3.98-8.94) respectively. This was not different to the incidence in other countries. Risk factors of oxygen desaturation were shorter in height [OR 0.95 (95% CI 0.92-0.97); p < 0.0011, higher ASA physical status [OR 3.37 (95% CI 1.98-5.72); p < 0.001], and use of propofol [OR 5.22 (95% CI 1.78-15.35); p = 0.003]. Other complications such as seizure, anaphylactic or anaphylactoid reaction, drug error, and pulmonary aspiration were scarce. There was no case of mismatched blood transfusion in the present study. CONCLUSION: Incidence of total spinal block, neurological complication, and suspected myocardial ischemia or infarction was uncommon. Risk factors of oxygen destruction were shorter in height, higher ASA physical status, and use of propofol. Some events were considered avoidable and preventable.

The Thai Anesthesia Incidents Study (THAI Study) of oxygen desaturation.

OBJECTIVES: To examine incidents, contributory factors, treatment and outcomes associated with oxygen desaturation during anesthesia practice in Thailand. MATERIAL AND METHOD: Relevant data were extracted from the Thai Anesthesia Incidents Study (THAI Study) database between February 1, 2003 and January 31, 2004 and analyzed by using mainly descriptive statistics. RESULTS: Four hundred and ninety seven incidents of oxygen desaturation (SpO2 <90 for at least 3min or < or = 85%) were reported. The incidents were widely distributed throughout anesthesia phases. Most of the incidents (92.2%) occurred during general anesthesia, while 23 (4.6%) occurred after regional anesthesia. Anesthesia was the sole contributory factor in 280 patients (56.8%) and a combination of that with other factors in 126 (25.4%). The majority of the incidents (88.4%) was related to respiratory adverse events, whereas, 8% was related to circulatory ones. Sixteen incidents (3.2%) were related to anesthetic machine and equipment failure. Most of the incidents (60.0%) caused minor physiologic changes and were correctable. The management was considered adequate in the majority of patients. As a result, 77.5 % of the patients recovered completely, whereas, death ensued in 5.8%. The cases of death were associated with co-morbidity (ASA class 4 and 5) with an Odds ratio of 12.9 (95% CI:5.4,31.0). The common contributory factors were inexperience, wrong decision, inadequate knowledge and lack ofsupervision. The proposed corrective strategies included improvement in supervision, care improvement, additional training, clinical practice guideline and quality assurance activity. CONCLUSION: Incidents associated with oxygen desaturation were distributed throughout all phases of anesthesia. Most of them were preventable and correctable. Therefore, anesthesia care providers should be alert in looking for incidents, and manage them promptly before they were in serious adverse events.

Cerebral electrical activity as a tool in evaluating anesthetic effect during balanced anesthesia with sevoflurane.

OBJECTIVES: The present study was undertaken to provide basic information about bilateral frontal cerebral electrical activity after induction, before and after skin incision, and at a steady state during sevoflurane anesthesia at the end tidal concentration 1, 1.2, 1.4 and 1.6 MAC and determine the association between the electrical cerebral activity with other clinical end points, i.e. motor responses and post-operative recall. MATERIAL AND METHOD: the Dual Channel Brain Activity, ABM2 (DATEX) was used to continuously monitor frontal EMG and electrical cerebral activities (i.e. frequency and amplitude) of both hemispheres in 20 adult female patients undergoing balanced anesthesia in Maharaj Chiang Mai Hospital. The eligible patients were randomly assigned to receive 1.0 MAC, 1.2MAC, 1.4MAC or 1.6MAC of a mixture of sevoflurane and 66.67% nitrous oxide in oxygen during anesthesia. The anesthesia was induced with 5 mg/kg thiopental and supplemented with 1-1.5 microgram per kilogram of fentanyl. The standard dose of pancuronium or atracurium was given during maintenance. RESULTS: After induction with 5 mg/kg thiopental, the mean (95% confidence interval) of frontal EMG significantly decreased from 2.66 (1.63,4.29) to 1.41 (0.2,1.61). When eyelash reflex was absent, the mean (95%CI) frequency and amplitude of the right frontal EEG was 3.89 (3.29, 4.497) Hz, 39.58 (32.11, 47.05) microvolt and left frontal EEG was 3.84 (3.43, 4.25) Hz, 33.55 (28.59, 38.61) microvolt. The findings were consistent with the raw EEG shown on the monitor, i.e. a progressive decrease in the frequency and an increase in the amplitude. During maintenance with the inhaled anesthetics, there was a statistically significant decrease in frequency of right frontal in those who had received the inhaled anesthetic concentration to reach 1.4 and 1.65 MAC (p < 0.05) (repeated measure ANOVA). At the steady state of end tidal concentration of the sevoflurane there was consistency in decreasing frequencies and increasing amplitudes of both hemispheres of the groups with higher MAC values (p < 0.05) (Table 3). However, the authors failed to demonstrate the relationships between EEG changes and other clinical responses. CONCLUSION: The present study has provided basic information about cerebral electrical activity during the balanced anesthesia with sevoflurane. As anesthesia deepened by increased MAC, the frequency decreased and the amplitude increased.

The Thai Anesthesia Incidents Study (THAI Study) of anesthetic outcomes: I. Description of methods and populations.

BACKGROUND AND RATIONALE: Since anesthesia, unlike medical or surgical specialties, does not constitute treatment, The Royal College of Anesthesiologists of Thailand host the Thai Anesthesia Incidents Study (THAI Study) of anesthetic outcomes to determine factors related to anesthesia related adverse events. MATERIAL AND METHOD: A prospective descriptive study of occurrence screening was conducted in 20 hospitals comprised of 7 university, 4 general and 4 district hospitals across Thailand. Anesthesia personnels were required to fill up patient-related, surgical-related, anesthesia-related variables and adverse outcomes on a strutured data entry form. The data included preanesthetic evaluation intraoperative period and 24 hr postoperative period. Adverse events specific form was recorded when adverse events occurred. All data were keyed in data management unit with double entry technique and descriptive statistics was used in the first phase of this study. RESULTS: A total of 163403 consecutive cases were recorded in one year. The mean (S.D.) of age, weight and height of patients were 38.6(2.3) yrs, 53.9(17.7) kgs and 153.4(22.7) cm respectively. There were more female (52.9%) than male (47. 1%) patients with ASA PS 1, 2, 3, 4, 5 = 50.8%, 36.3%, 10.7%, 2.0%, 0.2% respectively. Hypertension (11.6%), anemia (7.7%) and diabetes melitus (6.8%) were the three most common abnormalities in preanesthetic history taking. Mallampati score of 111870 patients grade 1, 2, 3, 4 were 54.0%, 39.7%, 5.6%, 0.7% and laryngoscopic grade 1, 2, 3, 4 of 74888 patients were 81.0%, 15.5%, 3.0% and 0.5% respectively. CONCLUSION: The first phase of THAI study epidemiological project can represent both the anesthesia and surgical profiles in Thailand. The collected data available should be useful for the improvement of the quality of anesthesia, guidelines for clinical practices, medical education and for further research.

Transfusion errors in the Thai Anesthesia Incidents Study (THAI Study): three cases.

Of 163,403 recorded cases of anesthesia in the Thai Anesthesia Incidents Study (THAI Study), transfusion errors occurred thrice. Case #1: a 68-year-old male, blood group A, undergoing hepatectomy, received two units of PRC and four units of FFP (all units were group A), but two of the FFP units were given to the wrong patient because the caregiver did not check the patient-identification on all of the blood bags. Case #2: a 42-year-old female, blood group A, undergoing emergency exploratory laparotomy, received 250 mL of group B-blood. Skin rashes, a clue for diagnosis of transfusion error were observed in the postoperative period. The error occurred because the caregiver did not check the patient-identification before starting the transfusion. Case #3: a 42-year-old female, blood group O, undergoing hysterectomy, received 430 mL of group AB-blood. More blood was requested in the ICU and it was discovered that the new bag was group O instead of AB. Mislabeling of the blood sample at the first blood request accounted for the error even though blood group O was recorded on the patient's OPD chart. The first two patients developed minor adverse reactions (grade 1) whereas the third developed a severe reaction (grade 3). All of the patients responded well to treatments. Accordingly, the system for preventing transfusion errors has been improved at both hospitals.

The Thai Anesthesia Incidents Study (THAI Study) of anesthetic outcomes: II. Anesthetic profiles and adverse events.

BACKGROUND AND RATIONALE: The purposes of the Thai Anesthesia Incidents Study (THAI Study) of anesthetic outcomes were to survey patients, surgical, anesthetic profiles and determine factors related to adverse events. MATERIAL AND METHOD: A prospective descriptive study of occurrence screening was conducted in 20 hospitals comprised of 7 university, 4 general and 4 district hospitals across Thailand. Anesthesia personnel were required to fill up patient-related, surgical-related, anesthesia-related variables and adverse outcomes on a structured data entry form. The data were collected during the preanesthetic evaluation, intraoperative period and 24 hr postoperative period. Adverse events specific forms were used to record when they occurred. All data were keyed at data management unit with double entry technique and descriptive statistics was used in the first phase of this study. RESULTS: A total of 163403 consecutive cases were recorded during first 12 months. MD. anesthesiologists involved with 82%, 89%, 45% and 0.2% of cases in university hospitals, regional hospitals, general hospitals and district hospitals respectively. Nurse anesthetists took a major involvement in hospitals run by the Ministry of Public Health. Two-thirds of cases did not receive any premedication (67%) and midazolam was most frequent premedication administered (20%). Common monitoring were non invasive blood pressure (NIBP) (97%), pulse oximetry (96%), electrocardiography (80%), urine output (33%), airway pressure (27%) and capnometry (19%) respectively. The choices of anesthesia were general anesthesia (62%), spinal anesthesia (23%), total intravenous anesthesia (6%), monitor anesthesia care (4%), brachial plexus block (3%) and epidural anesthesia (1%). The adverse events were oxygen desaturation (31.9:10000), cardiac arrest (30.8:10000), death within 24 hr. (28.3:10000), difficult intubation (22.5:10000),re-intubation (19.4:10000), unplanned ICU admission (7.2:10000), coma/cva/convulsion (4.8:10000), equipment malfunction/failure (3.4:10000), suspected myocardial ischemia or infarction (2.7:10000), awareness during anesthesia (3.8:10000), late detected esophageal intubation (4.1:10000), failed intubation (3.1:10000), anaphylaxis or anaphylactoid reaction (2.1:10000), nerve injury (2:10000), pulmonary aspiration (2.7:10000), drug error (1.3:10000), hazard to anesthesia personnel (1.5:10000), unplanned hospital admission (0.1:10000), total spinal block (1.3:10000) and mismatch blood transfusion (0.18:10000) CONCLUSION: Respiratory adverse events were common anesthesia direct related events. High incidence of cardiac arrest and death within 24 hr highlighted concerns for prevention strategies. Incidents of adverse events can be used for institutional quality improvement, educational quality assurance and further research for patient safety in anesthesia.