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1.
JAMA Surg ; 159(7): 756-764, 2024 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-38717762

RESUMO

Importance: Older adults with recent injuries can have impaired long-term biopsychosocial function and may benefit from interventions adapted to their needs. Objective: To determine if a collaborative care intervention, Trauma Medical Home (TMH), improved the biopsychosocial function of older patients in the year after injury. Design, Setting, and Participants: This was a single-blinded, randomized clinical trial conducted at 4 level I trauma centers in Indianapolis, Indiana, and Madison, Wisconsin. Between October 2017 and October 2021, patients aged 50 years and older with an Injury Severity Score (ISS) of 9 or greater and without traumatic brain or spinal cord injury were enrolled. Exclusions were significant brain injury or a spinal cord injury with a persistent neurologic deficit at the time of enrollment, extensive burns, pregnancy, incarceration, neurodegenerative disease, visual or auditory impairment that would preclude study participation, a life expectancy of less than 1 year, significant alcohol or drug use history, and acute stroke during admission. Of 10 276 patients screened, 430 were randomized and 299 completed 12-month follow-up. Data were analyzed from March to July 2023. Intervention: Intervention patients received 6 months of TMH delivered by a nurse care coordinator guided by an interdisciplinary team (trauma surgeon, pulmonary critical care and geriatrician physicians, nurses, and psychologist) in partnership with primary care. The care coordinator used standard protocols to monitor and treat biopsychosocial symptoms. Main Outcomes and Measures: Primary outcomes were Medical Outcome Study Short Form-36 (SF-36) score and Short Physical Performance Battery (SPPB) score at 12 months. Secondary outcomes were Patient Health Questionnaire-9 (PHQ-9) score, the Generalized Anxiety Disorder scale-7 (GAD-7) score, and health care utilization. Results: A total of 429 participants (228 [53.1%] female; mean [SD] age, 69.3 [10.8] years; mean [SD] ISS, 12.3 [4.6]) completed baseline assessments and were randomized. Follow-up was 76% (n = 324) at 6 months and 70% (n = 299) at 12 months. There were no differences between the TMH and usual care groups at 12 months in SF-36 Physical Component Summary score (mean [SD], 40.42 [12.82] vs 39.18 [12.43]), SF-36 Mental Component Summary score (mean [SD], 53.92 [10.02] vs 53.21 [10.82]), or SPPB score (mean [SD], 8.00 [3.60] vs 8.28 [3.88]). Secondary outcomes were also no different. Planned subgroup analysis revealed patients with baseline symptoms of anxiety or depression (high GAD-7 and PHQ-9 scores) experienced improvement in the Mental Component Summary score when randomized to the TMH intervention. Conclusions and Relevance: The TMH intervention did not significantly influence quality of life, depressive and anxiety symptoms, or physical function of older adults with injury at 12 months. Subgroup analysis showed positive impact in patients with a high burden of anxiety and depression symptoms at enrollment. Collaborative care interventions may improve long-term outcomes of select patients, but further research is needed. Trial Registration: ClinicalTrials.gov Identifier: NCT03108820.


Assuntos
Ferimentos e Lesões , Humanos , Feminino , Masculino , Idoso , Pessoa de Meia-Idade , Método Simples-Cego , Ferimentos e Lesões/terapia , Assistência Centrada no Paciente , Centros de Traumatologia , Escala de Gravidade do Ferimento , Equipe de Assistência ao Paciente , Idoso de 80 Anos ou mais
2.
J Surg Res ; 298: 222-229, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38626720

RESUMO

INTRODUCTION: Anticholinergic medications are known to cause adverse cognitive effects in community-dwelling older adults and medical inpatients, including dementia. The prevalence with which such medications are prescribed in older adults undergoing major surgery is not well described nor is their mediating relationship with delirium and dementia. We sought to determine the prevalence of high-risk medication use in major surgery patients and their relationship with the subsequent development of dementia. METHODS: This was a retrospective cohort study which used data between January 2013 and December 2019, in a large midwestern health system, including sixteen hospitals. All patients over age 50 undergoing surgery requiring an inpatient stay were included. The primary exposure was the number of doses of anticholinergic medications delivered during the hospital stay. The primary outcome was a new diagnosis of Alzheimer's disease and related dementias at 1-y postsurgery. Regression methods and a mediation analysis were used to explore relationships between anticholinergic medication usage, delirium, and dementia. RESULTS: There were 39,665 patients included, with a median age of 66. Most patients were exposed to anticholinergic medications (35,957/39,665; 91%), and 7588/39,665 (19.1%) patients received six or more doses during their hospital stay. Patients with at least six doses of these medications were more likely to be female, black, and with a lower American Society of Anesthesiologists class. Upon adjusted analysis, high doses of anticholinergic medications were associated with increased odds of dementia at 1 y relative to those with no exposure (odds ratio 2.7; 95% confidence interval 2.2-3.3). On mediation analysis, postoperative delirium mediated the effect of anticholinergic medications on dementia, explaining an estimated 57.6% of their association. CONCLUSIONS: High doses of anticholinergic medications are common in major surgery patients and, in part via a mediating relationship with postoperative delirium, are associated with the development of dementia 1 y following surgery. Strategies to decrease the use of these medications and encourage the use of alternatives may improve long-term cognitive recovery.


Assuntos
Antagonistas Colinérgicos , Delírio , Demência , Complicações Pós-Operatórias , Humanos , Antagonistas Colinérgicos/efeitos adversos , Feminino , Masculino , Estudos Retrospectivos , Idoso , Delírio/epidemiologia , Delírio/induzido quimicamente , Delírio/etiologia , Demência/epidemiologia , Demência/etiologia , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/etiologia , Pessoa de Meia-Idade , Idoso de 80 Anos ou mais , Fatores de Risco , Procedimentos Cirúrgicos Operatórios/efeitos adversos , Prevalência
3.
Trials ; 24(1): 634, 2023 Oct 03.
Artigo em Inglês | MEDLINE | ID: mdl-37789461

RESUMO

BACKGROUND: Delirium is a complex neuropsychiatric syndrome which consists of acute and varying changes in cognition and consciousness. Patients who develop delirium are at increased risk for a constellation of physical, cognitive, and psychological disabilities long after the delirium has ended. Collaborative care models integrating primary and specialty care in order to address patients with complex biopsychosocial needs have been demonstrated to improve outcomes in patients with chronic diseases. The purpose of this study is to evaluate the ability of a collaborative care model on the neuropsychologic recovery of delirium survivors following emergency surgery. METHODS: This protocol describes a multicenter (eight hospitals in three states) randomized controlled trial in which 528 patients who develop delirium following emergency surgery will be randomized to either a collaborative care model or usual care. The efficacy of the collaborative care model on cognitive, physical, and psychological recovery in these delirium survivors will then be evaluated over 18 months. DISCUSSION: This will be among the first randomized clinical trials in postoperative delirium survivors evaluating an intervention designed to mitigate the downstream effects of delirium and improve the neuropsychologic recovery after surgery. We hope that the results of this study will add to and inform strategies to improve postoperative recovery in this patient group. TRIAL REGISTRATION: ClinicalTrials.gov NCT05373017. Registered on May 12, 2022.


Assuntos
Delírio , Humanos , Delírio/diagnóstico , Delírio/etiologia , Delírio/psicologia , Resultado do Tratamento , Cognição , Estado de Consciência , Ensaios Clínicos Controlados Aleatórios como Assunto , Estudos Multicêntricos como Assunto
4.
Res Sq ; 2023 Sep 07.
Artigo em Inglês | MEDLINE | ID: mdl-37720054

RESUMO

Background: Delirium is a complex neuropsychiatric syndrome which consists of acute and varying changes in cognition and consciousness. Patients who develop delirium are at increased risk for a constellation of physical, cognitive, and psychological disability long after the delirium has ended. Collaborative care models integrating primary and specialty care in order to address patients with complex biopsychosocial needs has been demonstrated to improve outcomes in patients with chronic diseases. The purpose of this study is to evaluate the ability of a collaborative care model on the neuropsychologic recovery of delirium survivors following emergency surgery. Methods: This protocol describes a multicenter (eight hospitals in three states) randomized controlled trial in which 528 patients who develop delirium following emergency surgery will be randomized to either a collaborative care model or usual care. The efficacy of the collaborative care model on cognitive, physical, and psychological recovery in this delirium survivors will then be evaluated over eighteen months. Discussion: This will be among the first randomized clinical trials in postoperative delirium survivors evaluating an intervention designed to mitigate the downstream effects of delirium and improve the neuropsychologic recovery after surgery. We hope that the results of this study will add to and inform strategies to improve postoperative recovery in this patient group. Trial registration: NCT05373017 (clinicaltrials.gov).

5.
Artigo em Espanhol | LILACS-Express | LILACS | ID: biblio-1390675

RESUMO

Objetivo: Analizar los cuidados de enfermería en pacientes portadores de VIH con diagnóstico de Bronco Neumonía. Método: Se realizó una revisión bibliográfica de documentos científicos basados en los cuidados de enfermería en pacientes portadores de VIH con diagnóstico de Bronco Neumonía. Resultados: Se seleccionaron 15 artículos científicos que van en el rango de publicación del 2020 - 2021 con aportaciones relevantes. Conclusión: La función del profesional de enfermería es atender tanto a la persona sana como enferma, en todo tipo de actividades que contribuyen a su salud o a recuperarla, se estima que del 5 al 20% son afectados, de esta manera es la etiología más frecuente en la población infectada por el Virus de Inmunodeficiencia Humana con mayor incidencia en la población masculina joven.


Objective: To analyze nursing care in HIV patients with a diagnosis of Bronchopneumonia. Methods: A literature review of scientific papers based on nursing care in HIV patients with a diagnosis of Bronchopneumonia was carried out. Results: 15 scientific articles with relevant contributions were selected within the publication range of 2020 - 2021. Conclusion: The role of the nursing professional is to care for both the healthy and sick person, in all types of activities that contribute to their health or to recover it, it is estimated that 5 to 20% are affected, in this way it is the most frequent etiology in the population infected by the Human Immunodeficiency Virus with higher incidence in the young male population.

6.
Ann Surg Open ; 3(4): e217, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36590891

RESUMO

To compare differences in baseline depression and anxiety screenings between older injured patients with pre-existing diagnoses and those without. Background: Little is known about the prevalence and impact of psychiatric comorbidities on early postinjury depression and anxiety in nonneurologically injured older adults. Methods: This was a retrospective post-hoc analysis of data from the Trauma Medical Home, a multicenter randomized controlled trial (R01AG052493-01A1) that explored the effect of a collaborative care model on postinjury recovery for older adults compared to usual care. Results: Nearly half of the patients screened positive for at least mild depressive symptoms as measured by the Patient Health Questionnaire-9. Forty-one percent of the patients screened positive for at least mild anxiety symptoms as measured by the Generalized Anxiety Disorder Scale. Female patients with a history of concurrent anxiety and depression, greater injury severity scores, and higher Charlson scores were more likely to have mild anxiety at baseline assessment. Patients with a history of depression only, a prior history of depression and concurrent anxiety, and higher Charlson scores (greater medical comorbidity) had greater odds of at least mild depression at the time of hospital discharge after traumatic injury. Conclusions: Anxiety and depression are prevalent in the older adult trauma population, and affect women disproportionately. A dual diagnosis of depression and anxiety is particularly morbid. Mental illness must be considered and addressed with the same importance as other medical diagnoses in patients with injuries.

7.
J Surg Res ; 270: 327-334, 2022 02.
Artigo em Inglês | MEDLINE | ID: mdl-34731730

RESUMO

BACKGROUND: Delirium is among the most common complications following major surgery. Delirium following medical illness is associated with the development of chronic cognitive decline. The objective of this study was to determine the association of postoperative delirium with dementia in the year following surgery. MATERIALS AND METHODS: This was a retrospective cohort study in a large health network (January 2013 to December 2019). All patients over age 50 undergoing surgery requiring an inpatient stay were included. Our main exposure was an episode of delirium. The primary outcome was a new dementia diagnosis in the 1 y following discharge. Secondary outcomes included hospital length of stay, non-home discharge destination, mortality and rehospitalizations in 1 y. RESULTS: There were 39,665 patients included, with a median age of 66. There were 4156 of 39,665 emergencies (10.5%). Specialties were general surgery (12,285/39,665, 31%) and orthopedics (11,503/39,665, 29%). There were 3327 (8.4%) patients with delirium. Delirious patients were older and were more likely to have comorbid conditions and undergone complex procedures. There were 1353 of 39,665 (3.5%) patients who developed dementia in the year following their surgery; 4930 of 39,665 (12.4%) who died; and 8200 of 39,665 (20.7%) who were readmitted. Delirium was associated with a new dementia diagnosis after adjusting for baseline characteristics (Odds ratio [OR] 13.9; 95% CI, 12.2-15.7). Similarly, delirium was also associated with 1 y mortality (OR 3.1; 95% CI 2.9-3.4) and readmission (OR 1.9, 95% CI 1.7-2.0). CONCLUSIONS: Postoperative delirium is the strongest factor associated with development of dementia in the year following a major operation. Strategies to prevent, identify, and treat delirium in the postoperative setting may improve long-term cognitive recovery.


Assuntos
Delírio , Demência , Cognição , Delírio/diagnóstico , Delírio/epidemiologia , Delírio/etiologia , Demência/complicações , Demência/etiologia , Humanos , Pessoa de Meia-Idade , Alta do Paciente , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/prevenção & controle , Estudos Retrospectivos , Fatores de Risco
8.
J Surg Res ; 260: 38-45, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33316758

RESUMO

BACKGROUND: Urgent guidance is needed on the safety for providers of percutaneous tracheostomy in patients diagnosed with COVID-19. The objective of the study was to demonstrate that percutaneous dilational tracheostomy (PDT) with a period of apnea in patients requiring prolonged mechanical ventilation due to COVID-19 is safe and can be performed for the usual indications in the intensive care unit. METHODS: This study involves an observational case series at a single-center medical intensive care unit at a level-1 trauma center in patients diagnosed with COVID-19 who were assessed for tracheostomy. Success of a modified technique included direct visualization of tracheal access by bronchoscopy and a blind dilation and tracheostomy insertion during a period of patient apnea to reduce aerosolization. Secondary outcomes include transmission rate of COVID-19 to providers and patient complications. RESULTS: From April 6th, 2020 to July 21st, 2020, 2030 patients were admitted to the hospital with COVID-19, 615 required intensive care unit care (30.3%), and 254 patients required mechanical ventilation (12.5%). The mortality rate for patients requiring mechanical ventilation was 29%. Eighteen patients were assessed for PDT, and 11 (61%) underwent the procedure. The majority had failed extubation at least once (72.7%), and the median duration of intubation before tracheostomy was 15 d (interquartile range 13-24). The median positive end-expiratory pressure at time of tracheostomy was 10.8. The median partial pressure of oxygen (PaO2)/FiO2 ratio on the day of tracheostomy was 142.8 (interquartile range 104.5-224.4). Two patients had bleeding complications. At 1-week follow-up, eight patients still required ventilator support (73%). At the most recent follow-up, eight patients (73%) have been liberated from the ventilator, one patient (9%) died as a result of respiratory/multiorgan failure, and two were discharged on the ventilator (18%). Average follow-up was 20 d. None of the surgeons performing PDT have symptoms of or have tested positive for COVID-19. CONCLUSIONS: and relevance: PDT for patients with COVID-19 is safe for health care workers and patients despite higher positive end-expiratory pressure requirements and should be performed for the same indications as other causes of respiratory failure.


Assuntos
Broncoscopia/efeitos adversos , COVID-19/terapia , Transmissão de Doença Infecciosa do Paciente para o Profissional/prevenção & controle , Complicações Pós-Operatórias/epidemiologia , Respiração Artificial/efeitos adversos , Traqueostomia/efeitos adversos , Adulto , Idoso , Extubação/estatística & dados numéricos , Broncoscopia/instrumentação , Broncoscopia/métodos , Broncoscopia/normas , COVID-19/diagnóstico , COVID-19/mortalidade , COVID-19/transmissão , Teste de Ácido Nucleico para COVID-19/estatística & dados numéricos , Feminino , Seguimentos , Mortalidade Hospitalar , Humanos , Transmissão de Doença Infecciosa do Paciente para o Profissional/estatística & dados numéricos , Unidades de Terapia Intensiva/normas , Unidades de Terapia Intensiva/estatística & dados numéricos , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias/etiologia , Respiração Artificial/instrumentação , Respiração Artificial/métodos , Respiração Artificial/estatística & dados numéricos , Estudos Retrospectivos , SARS-CoV-2/isolamento & purificação , Índice de Gravidade de Doença , Fatores de Tempo , Traqueostomia/instrumentação , Traqueostomia/métodos , Traqueostomia/normas , Resultado do Tratamento
9.
J Surg Res ; 256: 31-35, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-32683053

RESUMO

BACKGROUND: Psychiatric illness is an independent risk factor for trauma and recidivism and is often comorbid in the trauma population. There is no current standard for the delivery of mental health services in trauma care. The purpose of this study was to gauge trauma surgeon perceptions of needed and currently available resources for this patient population at level 1 trauma centers in the United States. MATERIALS AND METHODS: A 10-question survey was developed to capture the estimated volume of psychiatric patients admitted to level 1 trauma centers, their available psychiatric services, and perceived need for resources. It was sent to 27 trauma surgery colleagues at different level 1 trauma centers across the United States using a public survey tool. Descriptive analyses were performed. RESULTS: Twenty-two of 27 trauma surgeons responded (81% response rate). Ten centers (48%) estimated admitting 1-5 patients with preexisting serious mental illness weekly, whereas others admitted more. Eight (36%) reported not having acute situational support services available. Ten respondents (46%) did not know how many psychiatric consultants were available at their institution. Twelve surgeons (55%) reported no designated outpatient follow-up for psychiatric issues. Sixteen trauma surgeons (73%) stated that expanded psychiatric services are needed at their trauma center. CONCLUSIONS: Trauma patients frequently present with preexisting serious mental illness and many struggle with psychological sequelae of trauma. Over half of the surveyed surgeons reported no outpatient follow-up for these patients, and almost three quarters perceived the need for expansion of psychiatric services. In addition to a lack of resources, these findings highlight an overlooked gap in high-quality patient-centered trauma care.


Assuntos
Recursos em Saúde/estatística & dados numéricos , Acessibilidade aos Serviços de Saúde/estatística & dados numéricos , Transtornos Mentais/terapia , Serviços de Saúde Mental/estatística & dados numéricos , Ferimentos e Lesões/epidemiologia , Assistência ao Convalescente/estatística & dados numéricos , Comorbidade , Humanos , Transtornos Mentais/epidemiologia , Serviços de Saúde Mental/organização & administração , Admissão do Paciente/estatística & dados numéricos , Assistência Centrada no Paciente/organização & administração , Assistência Centrada no Paciente/estatística & dados numéricos , Lacunas da Prática Profissional/estatística & dados numéricos , Fatores de Risco , Cirurgiões/estatística & dados numéricos , Inquéritos e Questionários/estatística & dados numéricos , Centros de Traumatologia/organização & administração , Centros de Traumatologia/estatística & dados numéricos , Estados Unidos/epidemiologia , Ferimentos e Lesões/psicologia , Ferimentos e Lesões/terapia
10.
Ochsner J ; 15(2): 183-6, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-26130983

RESUMO

BACKGROUND: Allergic reactions including anaphylaxis resulting from isosulfan blue dye are rare but warrant a thorough review given that lymph node mapping has become an increasingly common procedure, putting more patients at risk. CASE REPORT: Our patient was an 82-year-old female who underwent elective excision of a right forearm melanoma and right axillary sentinel lymph node mapping and suffered an anaphylactic reaction approximately 15 minutes after injection of isosulfan blue dye. The procedure was aborted. She was intubated; diphenhydramine and dexamethasone were administered; her blood pressure was stabilized with phenylephrine, epinephrine, and intravenous fluids; and she was transferred to the intensive care unit. She was extubated on postoperative day 1 and discharged home on postoperative day 2. CONCLUSION: Sentinel lymph node biopsy is the standard of care for staging several cancers, and isosulfan blue is the dye most commonly used for this procedure. Reactions to the dye occur in some patients; however, we recommend the continued use of isosulfan blue dye for lymph node mapping given the low incidence of adverse effects, with no reported mortalities. Physicians should be prepared for the potential risk of anaphylactic shock.

11.
Ann Vasc Surg ; 29(7): 1451.e17-20, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-26122419

RESUMO

We present the case of a patient with a complicated medical history, which included stent grafting as a life-saving measure for an iatrogenic inferior vena cava (IVC) injury. For persistent sepsis secondary to stent-graft infection, the patient underwent extraction of 2 IVC stent grafts, primary repair of a duodenal-caval fistula, and repair of the IVC with an allograft vein patch. Discussion of this case sought to shed light on the intricacies involved in medical decision making in an era of advanced medical technology.


Assuntos
Implante de Prótese Vascular/efeitos adversos , Prótese Vascular/efeitos adversos , Procedimentos Endovasculares/efeitos adversos , Infecções Relacionadas à Prótese/cirurgia , Sepse/cirurgia , Stents/efeitos adversos , Lesões do Sistema Vascular/cirurgia , Veia Cava Inferior/cirurgia , Implante de Prótese Vascular/instrumentação , Remoção de Dispositivo , Duodenopatias/microbiologia , Duodenopatias/cirurgia , Procedimentos Endovasculares/instrumentação , Feminino , Humanos , Doença Iatrogênica , Fístula Intestinal/microbiologia , Fístula Intestinal/cirurgia , Pessoa de Meia-Idade , Flebografia/métodos , Desenho de Prótese , Infecções Relacionadas à Prótese/diagnóstico , Infecções Relacionadas à Prótese/microbiologia , Reoperação , Sepse/diagnóstico , Sepse/microbiologia , Tomografia Computadorizada por Raios X , Resultado do Tratamento , Lesões do Sistema Vascular/diagnóstico , Lesões do Sistema Vascular/etiologia , Veia Cava Inferior/diagnóstico por imagem , Veia Cava Inferior/lesões , Veia Cava Inferior/microbiologia
12.
Acta méd. costarric ; 55(2): 96-102, abr.-jun. 2013. tab
Artigo em Espanhol | LILACS | ID: lil-700702

RESUMO

Se conoce que la transmisión perinatal del VIH es prevenible con la toma de algunas medidas generales y otras específicas. La acción fundamental para lograr esta prevención es identificar temprano durante el embarazo, cuáles mujeres embarazadas están infectadas por VIH. Para conseguir este objetivo es necesario realizar la prueba del ELISA para VIH, a toda embarazada, en su primera consulta prenatal. Las guías para la prevención de la transmisión perinatal de VIH se desarrollaron con el fin de facilitar la aplicación de todas las acciones necesarias para prevenir la transmisión perinatal de VIH en Costa Rica, brindando una óptima atención médica a la madre y al recién nacido. Los elementos fundamentales de estas guías incluyen: tratamiento con 3 antirretrovirales a las mujeres embarazadas VIH+, a apartir de la 12ava semana de gestación, uso intravenoso de Zidovudina en labor, vía de parto por cesárea, suspensión de la lactancia materna, profilaxis con Zidovudina al recién nacido a partir de las 8 horas de edad. Las guías proveen también recomendaciones para proceder en situaciones especiales relacionadas con la embarazada VIH+ y su hijo...


Assuntos
Humanos , Feminino , Gravidez , Transmissão de Doença Infecciosa , Relações Mãe-Filho , Gravidez , Síndrome da Imunodeficiência Adquirida/prevenção & controle , Síndrome da Imunodeficiência Adquirida/tratamento farmacológico , Zidovudina
13.
P. R. health sci. j ; 17(3): 243-52, Sept. 1998. graf, tab
Artigo em Inglês | LILACS | ID: lil-234834

RESUMO

OBJECTIVE: This study assesses the antitubercular potential of natural products obtained from plants reputed to have medicinal properties and collected from the tropical flora of Puerto Rico. BACKGROUND: The increase in persons infected with Mycobacterium tuberculosis (MTB) the world over and the development of resistance to antibiotics by this microbe and other infectious bacteria has created the need for new drugs to replace those which have lost effectiveness. METHOD: In Phase I of this study, ethanolic leaf extracts of fifty local plants were submitted to preliminary screening to assess their in vitro Mycobacterium smegmatis inhibitory activity using the Bauer-Kirby disk diffusion method. In Phase II, the definitive screening of the six most promising extracts which inhibited M. smegmatis were assayed for their MTB inhibitory activity using the BACTEC 460 susceptibility test method. The brine shrimp bioassay was used as a toxicity bioassay and the mice inoculation test was used to determine mice tolerance to the effect of the daily intraperitoneal inoculations of the plant extracts. RESULTS: MTB showed varying degrees of susceptibility to each plant extract. This effect was dependent upon the plant species, dose and time of exposure. Evidence is provided suggesting that: (1) Six crude plant extracts (12 per cent) tested possessed inhibitory capacity at the amount of 500 micrograms per disc; (2) Mammea americana extract yielded the strongest inhibitory effect at 50 micrograms per disc, followed by Marchantia polymorpha, Mangifera indica, Callistemon citrinus, Syzygium jambos and Momordica charantia; (3) the bactericidal inhibitory pattern of MTB growth, exposed to Mammea americana extract, was comparable to streptomycin; and (4) the transitory reduction pattern of MTB growth, produced by Callistemon citrinus, Marchantia polymorpha extracts at 100 micrograms and 250 micrograms, was similar to that of bacteriostatic agents. CONCLUSION: Of 50 plants screened six extracts tested for their anti-MTB activity yielded positive results with varying degrees of inhibition. Mammea americana showed the greatest inhibitory activity suggesting that certain plant species yield valuable anti-Mycobacterium tuberculosis substances. The procedures employed in this study, including the BACTEC 460 modified method, are useful for in vitro screening of plant extracts with potential antitubercular activity.


Assuntos
Animais , Camundongos , Antituberculosos/farmacologia , Mycobacterium tuberculosis/efeitos dos fármacos , Extratos Vegetais/farmacologia , Antituberculosos/administração & dosagem , Antituberculosos/toxicidade , Artemia/efeitos dos fármacos , Bioensaio , Tolerância a Medicamentos , Injeções Intraperitoneais , Testes de Sensibilidade Microbiana , Mycobacterium/efeitos dos fármacos , Extratos Vegetais/administração & dosagem , Extratos Vegetais/toxicidade , Porto Rico , Avaliação Pré-Clínica de Medicamentos
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