Neumonía aspirativa en pacientes adultos mayores / Aspiration pneumonia in the elderly patients

En la neumonía aspirativa hay evidencia radiológica de infiltrado parenquimal pulmonar en diferentes segmentos, como consecuencia del paso de secreciones contaminadas por agentes patógenos que proceden de la región orofaríngea o gastroesofágica hacia el árbol traqueobronquial. Se presenta principalmente en adultos mayores y en pacientes con alteraciones neurodegenerativas. Los mecanismos implicados en la aspiración son: la disfagia orofaríngea funcional y las alteraciones gastroesofágicas. Los gérmenes implicados son Streptococcus pneumoniae, Haemophilus influenza y S. aureus cuando la neumonía aspirativa ocurre en la comunidad y bacilos gramnegativos si es de ocurrencia intrahospitalaria. Los anaerobios pocas veces son agentes responsables. La historia clínica, radiografía pulmonar y otros procedimientos como la videofluroscopia orofaríngea, resultan útiles para el diagnóstico. El tratamiento está basado en el uso de antibióticos principalmente contra gérmenes aeróbicos grampositivos y gramnegativos y, excepcionalmente, contra anaerobios en situaciones especiales; y, medidas para disminuir las condiciones que favorecen la broncoaspiración.

In aspiration pneumonia there is radiological evidence of an infiltrate in the pulmonary parenchyma, in different segments, as a result of the passage of secretions contaminated by pathogens that come from the region of oropharyngeal or gastroesophageal tube to the tracheobronchial tree. It occurs mainly in the elderly and in patients with neurodegenerative disorders. The involved mechanisms in the aspiration are: functional oropharyngeal dysphagia and gastroesophageal alterations. The involved germs are Streptococcus pneumoniae, Haemophilus influenza and Staphylococcus aureus when the aspiration pneumonia occurs in the community and gram-negative bacilli in hospital occurrence. Anaerobic bacteria are rarely responsible agents. The clinical history, pulmonary x-ray and other procedures such as oropharyngeal videofluoroscopy are useful for diagnosis. Treatment is mainly based on the use of antibiotics against gram-positive and gram-negative aerobic germs and, exceptionally, against anaerobes in special situations; and, measures to reduce the conditions that favor the aspiration into lungs.

Persistent Pneumonia: Underlying Cause and Outcome.

Objective. To identify the causes and contributing factors of persistent pneumonia in children. Methods. 41 cases with persistent pneumonia were investigated (biochemical, microbiological, histopathological, immunological and radiological tests) to find out the underlying cause. Results. Out of 41 cases, 8 had pulmonary tuberculosis and 12 had Gram negative bacterial infections, 12 had aspiration due to gastroesophageal reflux disease or oil instillation, 3 had immunodeficiency due to HIV infection, 2 had congenital lung malformation, 2 had cardiac disorders and one had foreign body aspiration as causes of persistent pneumonia. The etiology could not be established in one case. Conclusion. The most common underlying cause of persistent pneumonia were persistent infection followed by aspiration and acquired immunodeficiency.

Effects of Metoclopramide and Ranitidine on Preoperative Gastric Contents in Day-Case Surgery

This prospective, randomized, double-blinded study was performed to evaluate the effects of intravenous metoclopramide and ranitidine on preoperative gastric contents in outpatients receiving intravenous anesthesia for laparoscopic gynecologic surgery. Fifteen minutes before the induction of anesthesia, the Z-M group (n=20) received 50mg ranitidine and 10mg metoclopramide intravenously and the control group (n=20) received the same volume of normal saline. Before the surgery, a 14-F multiorifice nasogastric tube was inserted to aspirate the gastric contents of patients under sedation with propofol and midazolam. The mean pH values of the gastric fluid were 2.7+/-2.0 (SD) [median 1.6 (range: 1.2-7.2)] in the control group, and 6.1+/-1.9 [median 6.8 (range 1.4-7.8)] in the Z-M group. The mean aspirated volumes (mL) were 15.3+/-10.4 (SD) [median 11.0 (range: 5.0-44.0)] in the control group, and 6.9+/-10.0 (SD) [median 4.5 (range: 0-38.0)] in the Z-M group. There were significantly more high-risk (gastric fluid volumes > 25mL and pH < 2.5) patients in the control group (4/20, 20%) than in the Z-M group (1/20, 5%). In conclusion, intravenous prophylactic ranitidine and metoclopramide may be an easy and useful method to decrease the volume while increasing the pH of gastric contents, and therefore may reduce the number of patients at risk for aspiration pneumonitis in ambulatory laparoscopic procedures who receive an anesthesia.

Effects of Metoclopramide and Ranitidine on Preoperative Gastric Contents in Day-Case Surgery

This prospective, randomized, double-blinded study was performed to evaluate the effects of intravenous metoclopramide and ranitidine on preoperative gastric contents in outpatients receiving intravenous anesthesia for laparoscopic gynecologic surgery. Fifteen minutes before the induction of anesthesia, the Z-M group (n=20) received 50mg ranitidine and 10mg metoclopramide intravenously and the control group (n=20) received the same volume of normal saline. Before the surgery, a 14-F multiorifice nasogastric tube was inserted to aspirate the gastric contents of patients under sedation with propofol and midazolam. The mean pH values of the gastric fluid were 2.7+/-2.0 (SD) [median 1.6 (range: 1.2-7.2)] in the control group, and 6.1+/-1.9 [median 6.8 (range 1.4-7.8)] in the Z-M group. The mean aspirated volumes (mL) were 15.3+/-10.4 (SD) [median 11.0 (range: 5.0-44.0)] in the control group, and 6.9+/-10.0 (SD) [median 4.5 (range: 0-38.0)] in the Z-M group. There were significantly more high-risk (gastric fluid volumes > 25mL and pH < 2.5) patients in the control group (4/20, 20%) than in the Z-M group (1/20, 5%). In conclusion, intravenous prophylactic ranitidine and metoclopramide may be an easy and useful method to decrease the volume while increasing the pH of gastric contents, and therefore may reduce the number of patients at risk for aspiration pneumonitis in ambulatory laparoscopic procedures who receive an anesthesia.

The Thai Anesthesia Incidents Study (THAI Study) of pulmonary aspiration: a qualitative analysis.

OBJECTIVES: To examine the risk factors, outcomes, and contributing factors associated with perioperative pulmonary aspiration. MATERIAL AND METHOD: Pulmonary aspiration incidents were extracted from the Thai Anesthesia Incidents Study (THAI Study) database conducted between March 1, 2003, and February 28, 2004, and analyzed using descriptive statistics. RESULTS: Thirty-two incidents of aspiration were reported. Passive regurgitation occurred more frequently than active vomiting. Aspiration occurred more commonly in elective rather than emergency surgery, with 59% of incidents taking place during the induction of anesthesia and intubation period. While a major immediate physiological disturbance was common, long term morbidity was not. Death ensued in 5 cases, most of which had significant co-morbidities. Most cases (62.5%) were appropriately treated. The majority of incidents occurred in ASA class 2 (56.3%), age group 15-64 years (59.4%), non obese (92.9%) and non-difficult intubation (71.9%). Most cases were incomplete fasted or had prolonged gastric emptying time. Nasogastric aspiration and rapid sequence induction with cricoid pressure were infrequently used (12.5, 25%). Factors reported as contributing to the incidents included failure of technique and error of judgement. Additional training, continuing medical education and quality assurance tended to minimize the incidents. CONCLUSION: Aspiration occurred commonly in patients with incomplete fasted or had prolonged gastric emptying time and underwent elective surgery. Additional training, continuing medical education and quality assurance tended to minimize the incidents.

Muertes inesperadas de niños en el hogar / Unespected death of children at home

Reevaluar la causa de muerte en infantes fallecidos en el hogar, aparentemente por neumonia según el informe médico legal. Se revisaron mediante un protocolo de diagnóstico anatomopatológico estándar diseñado para el propósito por 4 anatomopatólogos certificados, la causa de muerte originalmente descrita como neumonia en los informes médico legales en 56 lactantes fallecidos en forma brusca e inesperada, sin síntomas previos, en el hogar. Para ello se hizo reestudiar las muestras de los pulmones obtenidas en la necropsia. En 24 (42,9 porciento) de los 56 casos de pacientes aparentemente asintomáticos, cuya muerte fue originalmente atribuida a neumonia, no se encontró en la histopatología pulmonar una causa que explicase la muerte y fueron calificados finalmente como sugerentes de muerte súbita. En 11 (19,6 porciente) se encontró evidencia de broncoaspiración como causa de la muerte y solo en 10 (17,9 porciento) se confirmó la neumonia como explicación del deceso. Nuestros resultados alertan sobre la posibilidad de subnotificación de muerte por neumonia y muerte súbita en los registros oficiales