Journal of The Korean Society of Clinical Toxicology

Original Article

Enteral nutrition in mechanically ventilated patients after organophosphate poisoning: Sang U Bark, Jeong Mi Moon, Byeng Jo Chun; J Korean Soc Clin Toxicol. 2024;22(1):1-9. Published online June 28, 2024; DOI: https://doi.org/10.22537/jksct.2024.00001

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Abstract PDF: Purpose: Nutritional therapy is a crucial component of therapy for critically ill patients, but there is a lack of nutritional support guidelines for organophosphate (OP) poisoning, likely due to the gastrointestinal effects of atropine, the main antidote for OP. This study investigated whether enteral nutrition (EN) during atropinization is acceptable for mechanically ventilated patients after OP poisoning.
Methods
This retrospective study classified 82 patients with OP poisoning according to whether they were fed during atropinization while on mechanical ventilation (MV). Data on the baseline characteristics, nutritional support, and clinical outcomes were compared. Univariate and multivariate regression models were constructed to analyze the associations between atropine administration for OP poisoning and feeding intolerance-related EN after adjustment for risk factors.
Results
Eighty-two patients received EN after 72 hours on MV, and 40 of them simultaneously received 2 mg/hr atropine for the first 120 hours after EN initiation. The overall incidence of feeding intolerance was 57.3% during the first 12 days after EN initiation and did not differ according to atropine administration. Appropriate atropinization during EN in regression model 1 and the dosage of atropine administered during EN and the duration of EN during atropinization in model 2 were not associated with feeding intolerance in patients on MV after OP poisoning.
Conclusion
Appropriate atropinization is not associated with feeding intolerance after EN provision in patients on MV after OP poisoning. This study will help establish nutritional guidelines for OP poisoning patients. More research on nutritional support is needed to validate our results.

Case Report

Pulmonary thromboembolism following organophosphate intoxication: a case report: Ji Ho Lee; J Korean Soc Clin Toxicol. 2023;21(1):64-67. Published online June 30, 2023; DOI: https://doi.org/10.22537/jksct.2023.00002

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Abstract PDF: Various symptoms manifest after organophosphate intoxication due to muscarinic, nicotinic, and central nervous system effects. Complications are common, and morbidity occurs due to respiratory center depression, cardiovascular complications, aspiration pneumonia, general weakness, and neurological symptoms. Some studies have reported a statistically significant association between organophosphate intoxication and deep vein thrombosis. However, cases of pulmonary thromboembolism (PTE) resulting from organophosphate poisoning are very rare. A 45-year-old male patient was transferred to our hospital after ingesting an unknown amount of an insecticide and receiving 6 L of gastric lavage at a local hospital. Other than nausea, no symptoms (e.g., dyspnea) were present, but a hemodynamic test showed an elevated lactic acid level, and metabolic acidosis worsened over time. Accordingly, we conducted initial treatment including continuous renal replacement therapy. After 7 hours, the poisoning analysis result was confirmed, and lambda-cyhalothrin and chlorpyrifos (0.441 µg/mL and 0.401 µg/mL, respectively) were detected. We introduced pralidoxime. Although no increase in pseudocholinesterase was found during hospitalization, continuous renal replacement therapy and pralidoxime were discontinued because the patient did not show symptoms of intermediate syndrome, including dyspnea and altered consciousness. The patient complained of abdominal pain on hospital day 8. Abdominal computed tomography was performed to evaluate the possibility of a corrosive injury to the stomach or esophagus, and we confirmed PTE. The D-dimer level was 1.96 mg/L (normal range, 0–0.55 mg/dL). A radiologic examination showed a PTE in the main pulmonary artery leading to the segmental pulmonary artery. After heparinization, the patient was discharged after being prescribed a vitamin K-independent oral anticoagulant. Through this case, we would like to emphasize the need for a thorough evaluation of clinical symptoms because atypical symptoms can occur after poisoning with organophosphate pesticides.

A case of severe organophosphate poisoning used a high-dose atropine: Hyoung Ju Lee, Dae Sik Moon, Young Yun Jung, June Seob Byun, Chong Myung Kim; J Korean Soc Clin Toxicol. 2022;20(1):25-30. Published online June 30, 2022; DOI: https://doi.org/10.22537/jksct.2022.20.1.25

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Abstract PDF

In this study, we report the case of a 59-year-old male patient with organophosphate pesticide poisoning. He visited the local emergency medical center after ingesting 250 ml of organophosphate pesticide. The patient's symptoms improved after the initial intravenous infusion of pralidoxime 5 g and atropine 0.5 mg. However, 18 hours after admission, there was a worsening of the symptoms. A high dose of atropine was administered to improve muscarinic symptoms. A total dose of 5091.4 mg of atropine was used for 30 days, and fever and paralytic ileus appeared as side effects of atropine. Anticholinergic symptoms disappeared only after reducing the atropine dose, and the patient was discharged on the 35th day without any neurologic complications.

Citations

Citations to this article as recorded by

The effects of case management program completion on suicide risk among suicide attempters: A 5-year observational study
Hyun Jo Shin, Gwan Jin Park, Yong Nam In, Sang Chul Kim, Hoon Kim, Suk Woo Lee
The American Journal of Emergency Medicine.2019; 37(10): 1811. CrossRef

Assessment and Methods of Nutritional Support during Atropinization in Organophosphate and Carbamate Poisoning Cases: Jong-uk Park, Young-gi Min, Sangcheon Choi, Dong-wan Ko, Eun Jung Park; J Korean Soc Clin Toxicol. 2020;18(2):123-129. Published online December 31, 2020; DOI: https://doi.org/10.22537/jksct.2020.18.2.123

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Purpose: Atropine is an antidote used to relieve muscarinic symptoms in patients with organophosphate and carbamate poisoning. Nutritional support via the enteral nutrition (EN) route might be associated with improved clinical outcomes in critically ill patients. This study examined the administration of nutritional support in patients undergoing atropinization, including methods of supply, outcomes, and complications. Methods: A retrospective observational study was conducted in a tertiary care teaching hospital from 2010 to 2018. Forty-five patients, who were administered with atropine and on mechanical ventilation (MV) due to organophosphate or carbamate poisoning, were enrolled. Results: Nutritional support was initiated on the third day of hospitalization. Thirty-three patients (73.3%) were initially supported using parenteral nutrition (PN). During atropinization, 32 patients (71.1%) received nutritional support via EN (9) or PN (23). There was no obvious reason for not starting EN during atropinization (61.1%). Pneumonia was observed in both patient groups on EN and PN (p=0.049). Patients without nutritional support had a shorter MV duration (p=0.034) than patients with nutritional support. The methods of nutritional support during atropinization did not show differences in the number of hospital days (p=0.711), MV duration (p=0.933), duration of ICU stay (p=0.850), or recovery at discharge (p=0.197). Conclusion: Most patients undergoing atropinization were administered PN without obvious reasons to preclude EN. Nutritional support was not correlated with the treatment outcomes or pneumonia. From these results, it might be possible to choose EN in patients undergoing atropinization, but further studies will be necessary.

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Enteral nutrition in mechanically ventilated patients after organophosphate poisoning
Sang U Bark, Jeong Mi Moon, Byeng Jo Chun
Journal of The Korean Society of Clinical Toxicology.2024; 22(1): 1. CrossRef

Different Clinical Courses for Poisoning with WHO Hazard Class Ia Organophosphates EPN, Phosphamidon, and Terbufos in Humans: Jong Gu Mun, Jeong Mi Moon, Mi Jin Lee, Byeong Jo Chun; J Korean Soc Clin Toxicol. 2018;16(1):1-8. Published online June 30, 2018; DOI: https://doi.org/10.22537/jksct.2018.16.1.1

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Abstract PDF: Purpose: Extremely hazardous pesticides are classified as World Health Organization (WHO) hazard class Ia. However, data describing the clinical course of WHO class Ia OP (organophosphate) poisonings in humans are very scarce. Here, we compare the clinical features of patients who ingested hazard class Ia OPs. Methods: This retrospective observational case study included 75 patients with a history of ingesting ethyl p-nitrophenol thio-benzene phosphonate (EPN), phosphamidon, or terbufos. The patients were divided according to the chemical formulation of the ingested OP. Data regarding mortality and the development of complications were collected and compared among groups. Results: There were no differences in the baseline characteristics and severity scores at presentation between the three groups. No fatalities were observed in the terbufos group. The fatality rates in the EPN and phosphamidon groups were 11.8% and 28.6%, respectively. Patients poisoned with EPN developed respiratory failure later than those poisoned with phosphamidon and also tended to require longer mechanical ventilatory support than phosphamidon patients. The main cause of death was pneumonia in the EPN group and hypotensive shock in the phosphamidon group. Death occurred later in the EPN group than in the phosphamidon group. Conclusion: Even though all three drugs are classified as WHO class Ia OPs (extremely hazardous pesticides), their clinical courses and the related causes of death in humans varied. Their treatment protocols and predicted outcomes should therefore also be different based on the chemical formulation of the OP.

Implementing Best Practice in Critically Ill Organophosphate Poisoned Patient Through Simulation-Based Learning Program: Ji Hwan Lee, Sung Phil Chung, Hyun Soo Chung; J Korean Soc Clin Toxicol. 2017;15(1):31-39. Published online June 30, 2017; DOI: https://doi.org/10.22537/jksct.2017.15.1.31

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Abstract PDF: Purpose: Despite the clinical and socio-economic impact of acute poisoned patients, many of the treatments are not standardized in Korea. Moreover, no formal training that is specifically focused on clinical toxicology exists. Rather, training and education are conducted case by case in various institutions. This study was conducted to develop a standardized simulation-based clinical toxicology training curriculum for healthcare providers. This program will focus on specific assessment and treatment of critical toxicology patients, specifically those who have been poisoned with organophosphate. Methods: The study was performed using a pre- and post-design to determine the effects of implementation of this program. The study was conducted at eight different urban teaching hospitals in a simulated room in the clinical area. The study was targeted to 19 groups composed of emergency residents and nurses. Simulation-based learning was conducted for each group. Results: All 19 groups achieved the minimum passing score of 75%. Implementation of the program led to improved performance rates for overall management and cooperative moods competency (p<0.01). Inter-rater agreement between the two evaluators was excellent. In general, the participants thought the program was realistic and were able to recognize and improve the competencies needed to care for organophosphate poisoned patients. Conclusion: Simulation-based learning is an effective educational strategy that can be applied to improving and understanding proper care for rare but critical patients. This program was effective at improving team performance and cooperative moods when managing an organophosphate poisoned patient in the Emergency Department.

Hypoalbuminemia as a Predictor of 30-day Mortality in Patients with Acute Organophosphate Insecticide Poisoning: So Yeon Kim, Ryun Kyung Lee, Tae hu Kim, Dong Hoon Kim, Taeyun Kim, Soo Hoon Lee, Jin Hee Jeong, Sang Bong Lee, Changwoo Kang; J Korean Soc Clin Toxicol. 2017;15(1):11-16. Published online June 30, 2017; DOI: https://doi.org/10.22537/jksct.2017.15.1.11

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Abstract PDF: Purpose: The association of hypoalbuminemia with 30-day in-hospital mortality in patients with organophosphate insecticide poisoning (OPI) was studied. Methods: This retrospective cohort study was conducted between January 2006 and November 2013 in the emergency department (ED) after OPI poisoning. A Kaplan-Meier 30-day survival curve and the log-rank test were used to analyze patients stratified according to serum albumin levels on ED admission (hypoalbuminemia or normo-albuminemia). Independent risk factors including hypoalbuminemia for 30-day mortality were determined by multivariate Cox regression analysis. Results: A total of 135 patients were included. Eighty-eight (65%) patients were male and the mean age was $57.3{pm}17.0$ years. Serum albumin, mean arterial pressure, and Glasgow coma scale score were significantly higher in the survival group than the non-survival group. APACHE II score was significantly lower in the non-survival group than the survival group. The mortality of the hypoalbuminemia group (serum albumin <3.5 g/dl) was 68.8%, while that of the normo-albuminemia group (serum albumin ${geq}3.5g/dl$) was 15.1%. The area under the ROC curve of the serum albumin level was 0.786 (95% CI, 0.690-0.881) and the APACHE II score was 0.840 (95% CI, 0.770-0.910). Conclusion: Hypoalbuminemia is associated with 30-day mortality in patients with OPI poisoning.

Initial Blood Glucose Can Predict the Outcome of OP Poisoning: Sung Do Lee, Jeong Mi Moon, Byeong Jo Chun; J Korean Soc Clin Toxicol. 2015;13(2):55-61. Published online December 31, 2015

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Abstract PDF: Purpose: Many studies have examined the mechanisms of impaired glucose homeostasis after organophosphate (OP) exposure, however no study has evaluated the clinical utility of blood glucose measurements in patients with OP poisoning. The current study was conducted to evaluate the initial glucose level at presentation and the glycemic variables during the first 3 days after admission as a predictor of mortality. Methods: This retrospective observational case series included 228 patients with a history of OP poisoning. Among other clinical data, information on the initial glucose level at presentation and mean glucose level, delta glucose level, and the presence of a hypoglycemic event during the first 3 days of admission, was collected. Results: Survivors had lower initial glucose levels at presentation and glucose variability during the first 3 days of admission compared to non-survivors. The frequency of hypoglycemic events was higher in non-survivors. In multivariate analysis, the initial glucose level (> 233 mg/dl) was an independent predictor of mortality, along with age. Conclusion: The initial glucose level at presentation can be helpful in prediction of mortality in cases of OP intoxication at bedside. The physician should pay attention to patients with a glucose level >233 mg/dl at presentation after ingestion of OP.

Evaluation of Cardiac Function by Transthoracic Echocardiography in Patients with Myocardial Injury Secondary to Organophosphate Poisoning: Yoonsuk Lee, Oh Hyun Kim, Hyung Il Kim, Kyoung Chul Cha, Hyun Kim, Kang Hyun Lee, Sung Oh Hwang, Yong Sung Cha; J Korean Soc Clin Toxicol. 2015;13(2):62-70. Published online December 31, 2015

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Abstract PDF: Purpose: Cardiac complications may occur in cases of organophosphate (OP) poisoning. However, a few studies regarding patterns of cardiac toxicity as determined by transthoracic echocardiography (TTE) after exposure to OP have been reported. In the current study, the authors examined cardiac functions using TTE in patients with myocardial injury caused by exposure to OP. Methods: A retrospective review was conducted on 16 consecutive cases of OP poisoning with myocardial injury (defined as elevated troponin I within 48 hours of arrival at the regional emergency center in South Korea and diagnosed and treated at the center from January 2012 to November 2014. Results: TTE was performed in 11 (69%) of the 16 patients with an elevated troponin I (TnI) level within 48 hours. Of these 11 patients, 5 patients (45.5%) exhibited reduced ejection fraction (EF), and 3 exhibited regional wall motion abnormality (RWMA). Two patients (18.2%) had both reduced systolic function and RWMA. Two of the 5 patients with reduced EF returned to normal systolic function, however two patients did not regain normal systolic function after admission. One patient expired due to multiple organ failure, and 4 patients were transferred with a moribund status. Twelve of 15 patients who survived to discharge (at 4 to 35 months) were followed. Five of these patients died during follow-up and 7 survived without further complications. Conclusion: OP can cause reversible cardiac dysfunction including reduced systolic function and RWMA. Serum TnI may be useful for initial assessment of cardiac function during the workup of patients suffering from OP poisoning. After the initial assessment of cardiac enzyme, further evaluation with TTE in patients with abnormal cardiac enzyme will be necessary to understand the cardiac toxicity.

Effect of Alcohol on Death Rate in Organophosphate Poisoned Patients: Yong Hun Min, Seung Min Park, Kui Ja Lee, Young Taeck Oh, Hee Cheol Ahn, You Dong Sohn, Ji Yun Ahn, Young Hwan Lee, Sang Ook Ha, Yu Jung Kim; J Korean Soc Clin Toxicol. 2015;13(1):19-24. Published online June 30, 2015

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Abstract PDF: Purpose: Many patients who are acutely poisoned with organophosphorus pesticides have co-ingested alcohol. The purpose of this study was to identify the factors that influence mortality in organophosphate intoxication and the differences between alcohol coingested patients and non-coingested patients, looking at vital signs, length of admission, cholinesterase activity, complications, and mortality. Methods: All patients visiting one Emergency Department (ED) with organophosphate intoxication between January 2000 and December 2012 were reviewed retrospectively. The patients were divided into two groups, alcohol coingested group and non-coingested group. Results: During the study period, 136 patients (alcohol coingested group, 95 patients; non-coingested group, 41 patients) presented to the ED with organophosphate intoxication. Seventy-one alcohol coingested patients (74.1%) vs. 16 non-coingested patients (39.0%) received endotracheal intubation, with results of the analysis showing a clear distinction between the two groups (p=0.001). Twenty-three alcohol coingested patients (24.2%) vs. 1 non-coingested patient (2.4%) required inotropics, indicating a significant gap (p=0.002). Twenty-eight alcohol coingested patients (29.5%) vs. 2 non-coingested patients (4.9%) died, with results of the analysis showing a clear distinction between the two groups (p=0.002). Conclusion: In cases of organophosphate intoxication, alcohol coingested patients tended to receive endotracheal intubation, went into shock, developed central nervous system complications, and more died.

A Case of Central Nervous System (CNS) Toxicity in Acute Organophosphate Intoxication: Jae Sung Lee, Jin Hui Paik, Sung Hyun Yun, Ji Hye Kim, Seung Baik Han, Jun Sig Kim, Hyun Min Jung; J Korean Soc Clin Toxicol. 2013;11(1):31-35. Published online June 30, 2013

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Abstract PDF: Acute organophosphate intoxication is important because of its high morbidity and mortality. The mortality is still high despite the use of atropine as specific antidotal therapy and oximes for reactivation of acetylcholinesterase. Inhibition of acetylcholinesterase by organophosphate can cause acute parasympathetic system dysfunction, muscle weakness, seizure, coma, and respiratory failure. Acute alteration in conscious state or a coma, which may occur following organophosphate intoxication, is an indication of severe intoxication and poorer prognosis. This acute decline in conscious state often reverses when the cholinergic crisis settles; however, it may be prolonged in some patients. We report on a case of a 60-year-old male who showed prolonged decline in conscious state due to of Central Nervous System (CNS) toxicity after a suicide attempt with organophosphate.

Comparison of Severity in Organophosphate Insecticide Poisoning Patients Treated with Tracheostomy: Dae-Hyuk Choo, Yong-Jin Park, Sun-Pyo Kim, Seog-Jung Kim, Soo-Hyung Cho, Nam-Soo Cho; J Korean Soc Clin Toxicol. 2011;9(2):61-70. Published online December 31, 2011

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Abstract PDF: Purpose: This study investigated the effect on survival rate for organophosphate intoxication patients who received trachostomy. This research was conducted to help identify appropriate treatment of patients who received a trachostomy. Methods: This research was retrospectively conducted using the medical records of 141 patients who arrived at the Chosun University Hospital emergency medical center between Jan 2007 and Dec 2010, suffering from organophosphate intoxication. They were placed in two groups including one which received trachostomy as part of their treatment and one that did not. The effect of each variable on mortality was evaluated by regressionanalysis. Results: Of 141 patients with organophosphate intoxication, 105 of them did not tracheostomy and 16 were dead cohorts (15.2%). Their size of pupil was 1mm. Factors such as amount of organophosphate ingested, PAM time after ingestion, average body temperature, arrival time, atropinization time after ingestion, AST/ALT, Bun/Cr all appeared to be significant factors in death cohorts (P<0.05). 36 patients among the total had tracheostomy and 11 ones of them were in dead cohort (30.6%) and their average age was 58 years. The facts affect the state of patients in dead cohort include the amount of intoxication which between $327.27{pm}194.1ml$, performing intubation 686 mins after intubation, reaching to the hospital after 580mins, injecting PAM 744 mins after intoxication, injecting atropine 627 mins after intoxication. The largest cases of patient's state was found to be stupor with 14 patients (38.9%) the level of Cholinesterase in blood appeared to be significant in dead cohort as $391.00{pm}353.9IU/L$ (P<0.05). Conclusion: Further planned studies are necessary on the use of tracheostomy for treatment of poisoning victims, especially those intoxicated by organophosphorus insecticides.

The Factors that Predict Using Mechanical Ventilation for Patients with Organophosphate Intoxication: Dong-Chan Park, Jung-Bae Park, Yun-Jeong Kim, Soo-Jeong Shin, You-Ho Mun, Sin-Ryul Park, Hyun-Wook Ryoo, Kang-Suk Seo, Jae-Myung Chung; J Korean Soc Clin Toxicol. 2010;8(2):106-112. Published online December 31, 2010

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Abstract PDF: Purpose: The purpose of this study is to investigate the factors that predict using mechanical ventilation for patients with organophosphate intoxication. Methods: We retrospectively reviewed the medical records of 111 patients with acute organophosphate intoxication and who were treated in our emergency center from January 2000 to December 2008. We compared the toxicologic characteristics, the laboratory findings and the APACHE II scores between the Mechanical Ventilation group (MV group) and the non-Mechanical Ventilation group (the non MV group). Results: Sixty three patients were in the MV group and 48 patients were in the non MV group. In the MV group, the patients had an older age (p<0.001), a larger amount of ingestion (p<0.001), a lower initial serum cholinesterase level (p=0.003), a higher APACHE II score (p<0.001) and they ingested a more toxic agent (p=0.001). There were no significant differences in gender, the type of visit and the arrival time between the MV group and the non MV group. Conclusion: We suggest that the patient's age, the amount of organophosphate ingestion, the toxicity of the agent, the initial serum cholinesterase level and the APACHE II score are important factors to determine if mechanical ventilation will be applied for patients with organophosphate intoxication.

A Case of Bentazone Poisoning Mimicking Organophosphate Intoxication: Hyun-Min Jung, Ji-Hye Kim, Seung-Baik Han, Jin-Hui Paik, Ji-Yoon Kim, Jun-Sig Kim; J Korean Soc Clin Toxicol. 2010;8(2):122-124. Published online December 31, 2010

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Abstract PDF: $Basagran^{(R)}$ is a herbicide that is widely used in the field and it acts by interfering with photosynthesis in plants. It consists of bentazone, 2-methyl-4-chlorophenoxyacetic acid (MCPA) and surfactants. Bentazone is commonly used, but poisoning due to Bentazone has not been previously reported in Korea. The patients with toxic effects of bentazone show mild to severe symptoms and various complications. We report here on a case of a woman who intentionally ingested 500 ml of $Basagran^{(R)}$ and she was discharged without complication. As soon as the patient visited the emergency department, we started to treat her as if she had organophosphate intoxication because of the cholinergic symptoms. We could not detect the bentazone in her serum and urine, and we could confirm $Basagran^{(R)}$ ingestion only after getting information from her husband. Bentazone poisoning may induce harmful complications like muscle rigidity, rhabdomyolysis, respiratory failure and cardiac arrest. A detailed history taking, an accurate analysis method and early conservative management will be helpful for patients with acute bentazone poisoning.

A Study on Organophosphate Poisoning Patients: Comparison of the Survivor Group and Dead Group: Youn-Gyu Choi, Dong-Hyeon Lee, Woo-Hyung Kim, Gang-Wook Lee, Sun-Pyo Kim, Seong-Jung Kim, Soo-Hyung Cho, Nam-Soo Cho; J Korean Soc Clin Toxicol. 2010;8(1):16-23. Published online June 30, 2010

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Abstract PDF: Purpose: Organophosphate insecticide poisoning is common in Korea, but there is no definitive guideline for determining the severity of the poisoning and the predictive factors. Therefore, we evaluated the organophosphate poisoned patients and we divided them into two groups, the survivors and the dead, and the results might be useful for treating organophosphate poisoning patients. Methods: We performed a retrospective analysis of 68 organophosphate poisoned patients who visited the Chosun University Hospital Emergency Medical Center during a 24-month period from January, 2007 to December, 2008. We made a work sheet of the patients' characteristics and the collected data was analyzed and we compared this data between the survivor group and the dead patient group. Results: There were significant differences between the survivor group and the dead patient group for the mean age, the alcohol intake state and the typically expressed signs. The dead patients had lower blood pressure, tachycardia and a lower Glasgo Coma Score (GCS) score than the survivor group. On the arterial blood gas analysis, the dead patients had more severe acidemia and they had lower saturations. Increased serum amylase levels were found in the dead patients. The survivors'initial and follow up serum pseudocholinesterase activity (after 6~8 days) was significantly higher than that of the dead group. The total amount of atropine injected to patient was less in the survivors than that in the dead patients. Conclusion: Old age and expressing the typical intoxication signs, a lower GCS score and blood pressure, showing acidosis on the gas analysis and low serum cholinesterase activity may be useful as poor prognostic indicators for patients with organophosphate poisoning. We suggest that physicians must pay careful attention to the signs and prognostic factors of organophosphate insecticide poisoned patients.

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