RESUMO
BACKGROUND: We explored the experience of clinicians from the Spanish Society of Anesthesiology (SEDAR) in airway management of COVID-19 patients. METHODS: An software-based survey including a 32-item questionnaire was conducted from April 18 to May 17, 2020. Participants who have been involved in tracheal intubations in patients with suspected or confirmed COVID-19 infection were included anonymously after obtaining their informed consent. The primary outcome was the preferred airway device for tracheal intubation. Secondary outcomes included the variations in clinical practice including the preferred video laryngoscope, plans for difficult airway management, and personal protective equipment. RESULTS: 1125 physicians completed the questionnaire with a response rate of 40,9%. Most participants worked in public hospitals and were anesthesiologists. The preferred device for intubation was the video laryngoscope (5.1/6), with the type of device in decreasing order as follows: Glidescope, C-MAC, Airtraq, McGrath and King Vision. The most frequently used device for intubation was the video laryngoscope (70,5%), using them in descending order as follow: the Airtraq, C-MAC, Glidescope, McGrath and King Vision. Discomfort of intubating wearing personal protective equipment and the frequency of breaching a security step was statistically significant, increasing the risk of cross infection between patients and healthcare workers. The opinion of senior doctors differed from younger physicians in the type of video-laryngoscope used, the number of experts involved in tracheal intubation and the reason that caused more stress during the airway management. CONCLUSIONS: Most physicians preferred using a video-laryngoscope with remote monitor and disposable Macintosh blade, using the Frova guide.
Assuntos
COVID-19 , Laringoscópios , Médicos , Manuseio das Vias Aéreas , Humanos , Intubação Intratraqueal , Laringoscopia , SARS-CoV-2 , Espanha , Inquéritos e QuestionáriosRESUMO
BACKGROUND: We explored the experience of clinicians from the Spanish Society of Anesthesiology in airway management of COVID-19 patients. METHODS: An software-based survey including a 32-item questionnaire was conducted from April 18 to May 17, 2020. Participants who have been involved in tracheal intubations in patients with suspected or confirmed COVID-19 infection were included anonymously after obtaining their informed consent. The primary outcome was the preferred airway device for tracheal intubation. Secondary outcomes included the variations in clinical practice including the preferred video laryngoscope, plans for difficult airway management, and personal protective equipment. RESULTS: 1125 physicians completed the questionnaire with a response rate of 40,9%. Most participants worked in public hospitals and were anesthesiologists.The preferred device for intubation was the video laryngoscope (5.1/6), with the type of device in decreasing order as follows: Glidescope, C-MAC, Airtraq, McGrath and King Vision. The most frequently used device for intubation was the video laryngoscope (70,5%), using them in descending order as follow: the Airtraq, C-MAC, Glidescope, McGrath and King Vision.Discomfort of intubating wearing personal protective equipment and the frequency of breaching a security step was statistically significant, increasing the risk of cross infection between patients and physicians. The opinion of senior doctors differed from younger physicians in the type of video-laryngoscope used, the number of experts involved in tracheal intubation and the reason that caused more stress during the airway management. CONCLUSIONS: Most physicians preferred using a video-laryngoscope with remote monitor and disposable Macintosh blade, using the Frova guide.
RESUMO
The current COVID-19 pandemic has rendered up to 15% of patients under mechanical ventilation. Because the subsequent tracheotomy is a frequent procedure, the three societies mostly involved (SEMICYUC, SEDAR and SEORL-CCC) have setup a consensus paper that offers an overview about indications and contraindications of tracheotomy, be it by puncture or open, clarifying its respective advantages and enumerating the ideal conditions under which they should be performed, as well as the necessary steps. Regular and emergency situations are displayed together with the postoperative measures.
Assuntos
Betacoronavirus , Consenso , Infecções por Coronavirus/epidemiologia , Pneumonia Viral/epidemiologia , Sociedades Médicas , Traqueostomia/normas , Anestesiologia , Broncoscopia/efeitos adversos , Broncoscopia/normas , COVID-19 , Contraindicações de Procedimentos , Unidades de Cuidados Coronarianos , Procedimentos Cirúrgicos Eletivos/normas , Emergências , Humanos , Unidades de Terapia Intensiva , Otolaringologia , Procedimentos Cirúrgicos Otorrinolaringológicos , Pandemias , Cuidados Pós-Operatórios/métodos , Cuidados Pós-Operatórios/normas , Respiração Artificial/normas , Ressuscitação , SARS-CoV-2 , Espanha/epidemiologia , Fatores de Tempo , Traqueostomia/efeitos adversos , Traqueostomia/métodosRESUMO
The current COVID-19 pandemic has rendered up to 15% of patients under mechanical ventilation. Because the subsequent tracheotomy is a frequent procedure, the three societies mostly involved (SEMICYUC, SEDAR and SEORL-CCC) have setup a consensus paper that offers an overview about indications and contraindications of tracheotomy, be it by puncture or open, clarifying its respective advantages and enumerating the ideal conditions under which they should be performed, as well as the necessary steps. Regular and emergency situations are displayed together with the postoperative measures.
Assuntos
Betacoronavirus , Consenso , Infecções por Coronavirus/epidemiologia , Pneumonia Viral/epidemiologia , Sociedades Médicas , Traqueostomia/normas , Anestesiologia , Broncoscopia/efeitos adversos , Broncoscopia/normas , COVID-19 , Contraindicações de Procedimentos , Unidades de Cuidados Coronarianos , Procedimentos Cirúrgicos Eletivos/normas , Emergências , Humanos , Unidades de Terapia Intensiva , Otolaringologia , Procedimentos Cirúrgicos Otorrinolaringológicos , Pandemias , Cuidados Pós-Operatórios/métodos , Cuidados Pós-Operatórios/normas , Respiração Artificial/normas , Ressuscitação , SARS-CoV-2 , Espanha/epidemiologia , Fatores de Tempo , Traqueostomia/efeitos adversos , Traqueostomia/métodosRESUMO
The aim of this article was to report the emergence of patient infections with linezolid-resistant Staphylococcus epidermidis (LRSE) in a tertiary university hospital. Our objectives were to determine the molecular mechanism of the resistance, set up the genetic relationship among isolates, and analyze the relations between linezolid usage, period of treatment, and emergence of resistance in the hospital. The emergence of infection with linezolid-resistant S. epidermidis affecting 20 patients in a tertiary university hospital was investigated using repetitive sequence-based PCR (rep-PCR, DiversiLab System; BioMérieux, Inc., France). The presence of the G2576T mutation of 23S rRNA was screened by pyrosequencing. We determined the pattern of linezolid usage in the hospital as a whole and in the critical care unit that was most affected. G2576T mutation of 23S rRNA was detected in all linezolid-resistant S. epidermidis studied. Of these, 90% were genetically related and had been recovered from patients admitted to the same critical care unit. There had been an increase in linezolid usage in the hospital and in the critical care unit in the 2 years prior to the emergence of resistant strains. More strict control measures in hand washing and linezolid prescription were subsequently established, but no reduction in LRSE rates have yet been observed. Linezolid-resistant S. epidermidis emerged at our hospital, probably from a single strain originating in the critical care unit. The most likely explanation is that person-to-person spread of linezolid-resistant S. epidermidis led to skin colonization and, after linezolid treatment, this resistant staphylococci became the dominant cutaneous flora causing infection in some critical patients. In order to preserve the usefulness of this antibiotic as a therapeutic agent and to avoid a situation similar to methicillin-resistant Staphylococcus aureus, judicious use of antibiotics is essential.
Assuntos
Acetamidas/farmacologia , Antibacterianos/farmacologia , Infecção Hospitalar/microbiologia , Farmacorresistência Bacteriana , Oxazolidinonas/farmacologia , Infecções Estafilocócicas/microbiologia , Staphylococcus epidermidis/efeitos dos fármacos , Análise por Conglomerados , Estado Terminal , Infecção Hospitalar/epidemiologia , Impressões Digitais de DNA , DNA Bacteriano/química , DNA Bacteriano/genética , Uso de Medicamentos , Feminino , Genótipo , Humanos , Unidades de Terapia Intensiva , Linezolida , Masculino , Testes de Sensibilidade Microbiana , Epidemiologia Molecular , Mutação Puntual , RNA Ribossômico 23S/genética , Análise de Sequência de DNA , Infecções Estafilocócicas/epidemiologia , Staphylococcus epidermidis/classificação , Staphylococcus epidermidis/genética , Staphylococcus epidermidis/isolamento & purificaçãoRESUMO
On the occasion of the bicentennial of the first ovariectomy, we reviewed the beginnings of abdominal gynecologic surgery in Spain in order to shed light on aspects that are still unclear in medical historiography and that are often wrongly presented. We consulted a large number of sources that allowed us to follow events in the last quarter of the nineteenth century, discovering information we consider definitive and that confirmed our initial hypotheses. The work of Dr Federico Rubio, the first to perform an ovariectomy in Spain, is highlighted among the early experiences of our Spanish surgeons. Emphasis is placed on the high mortality rate associated with this operation at the beginning. We also analyze the problems of anesthesia and antisepsis and the influence of each on the surgical procedure. The events uncovered were the work of a group of forward-thinking surgeons who made considerable progress against opposing groups with more conservative views and whose contributions to Spanish surgery were far less brilliant.
Assuntos
Anestesia Geral/história , Antissepsia/história , Procedimentos Cirúrgicos em Ginecologia/história , Laparotomia/história , Ovariectomia/história , Dissidências e Disputas/história , Feminino , Procedimentos Cirúrgicos em Ginecologia/métodos , História do Século XIX , História do Século XX , Humanos , Kentucky , Cistos Ovarianos/história , Cistos Ovarianos/cirurgia , Ovariectomia/métodos , Ovariectomia/mortalidade , Ovariectomia/estatística & dados numéricos , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/mortalidade , Complicações Pós-Operatórias/prevenção & controle , Choque Séptico/etiologia , Choque Séptico/mortalidade , Choque Séptico/prevenção & controle , EspanhaRESUMO
Helium is a noble gas whose low density decreases airway resistance. This property is utilized when a mixture of helium and oxygen (heliox) is employed in certain clinical situations, particularly in the context of airway obstruction. We report the case of a woman with severe upper airway obstruction due to bilateral vocal cord paralysis after thyroidectomy. Heliox was used temporarily to reduce respiratory effort and avoid the need for tracheal intubation while the obstruction was being treated with antiinflammatory drugs.
Assuntos
Obstrução das Vias Respiratórias/tratamento farmacológico , Hélio/uso terapêutico , Oxigenoterapia , Oxigênio/uso terapêutico , Complicações Pós-Operatórias/tratamento farmacológico , Tireoidectomia , Paralisia das Pregas Vocais/etiologia , Trabalho Respiratório/efeitos dos fármacos , Obstrução das Vias Respiratórias/etiologia , Anti-Inflamatórios/uso terapêutico , Estimulação Encefálica Profunda , Dexametasona/uso terapêutico , Dispneia/etiologia , Emergências , Feminino , Hélio/farmacologia , Humanos , Edema Laríngeo/tratamento farmacológico , Edema Laríngeo/etiologia , Pessoa de Meia-Idade , Oxigênio/farmacologia , Doença de Parkinson/complicações , Doença de Parkinson/terapia , Complicações Pós-Operatórias/etiologia , Paralisia das Pregas Vocais/tratamento farmacológicoRESUMO
Intracardiac thrombosis is a rare complication in patients receiving haemodynamic support with venous-arterial extracorporeal membrane oxygenation (VA-ECMO), but it has a high risk of mortality. This case report describes a patient who suffered cardiogenic shock after a ST-segment elevation myocardial infarction (STEMI) and who presented with intracardiac thrombosis during VA-ECMO support on two occasions after mitral valve replacement. The first one was after the insertion of a mechanical prosthesis, and the second, after replacing it with a biological valve.
Assuntos
Oxigenação por Membrana Extracorpórea/efeitos adversos , Cardiopatias/etiologia , Trombose/etiologia , Idoso , Ecocardiografia , Oxigenação por Membrana Extracorpórea/métodos , Cardiopatias/diagnóstico por imagem , Cardiopatias/patologia , Humanos , Masculino , Trombose/diagnóstico por imagem , Trombose/patologiaRESUMO
Superior vena cava syndrome (SVCS) results from superior vena cava obstruction, causing a decrease in venous return from the head, neck, and upper extremities. Although the most frequent cause is still malignant tumour processes, in recent years an increase has been observed in non-tumour causes, such as thrombosis of intravascular devices or iatrogenic causes during cardiac surgery. A case is presented of SVCS after cardiac surgery treated satisfactorily by an endovascular technique and systemic anticoagulation.
Assuntos
Anticoagulantes/uso terapêutico , Procedimentos Endovasculares/métodos , Implante de Prótese de Valva Cardíaca/efeitos adversos , Complicações Pós-Operatórias/terapia , Síndrome da Veia Cava Superior/terapia , Idoso de 80 Anos ou mais , Valva Aórtica/cirurgia , Estenose da Valva Aórtica/cirurgia , Veias Braquiocefálicas/diagnóstico por imagem , Veias Braquiocefálicas/lesões , Feminino , Humanos , Doença Iatrogênica , Complicações Intraoperatórias/diagnóstico por imagem , Complicações Intraoperatórias/etiologia , Valva Mitral/cirurgia , Insuficiência da Valva Mitral/cirurgia , Complicações Pós-Operatórias/diagnóstico por imagem , Síndrome da Veia Cava Superior/diagnóstico por imagem , Trombose/diagnóstico por imagem , Veia Cava Superior/diagnóstico por imagem , Veia Cava Superior/lesõesRESUMO
OBJECTIVES: To evaluate the preference in the anaesthetic technique by anaesthesiologists for the management of inguinal hernia surgery in Galicia. MATERIAL AND METHODS: Using the National Catalogue of Hospitals of the Ministry of Health and Consumer Affairs in Galicia, a questionnair was sent to the Heads of Anaesthesiology Service and Coordinators of the Postanaesthesia Care Unit (PACU) with 11 questions on the anaesthetic technique chosen by anaesthesiologists in the management of patients for inguinal hernia surgery, as well as their reasons. RESULTS: The questionnaire was sent to 11 hospitals: 8 with PACU and 3 District. A total of 94 professionals responded, 56% with more than 10 years of experience, who performed between 8-10 procedures/month (58%) on an outpatient basis (61.54%). The most used anaesthetic technique was intradural in 52.8%, compared to 41.8% of general anaesthesia. Respondents with more than 10 years of experience preferred spinal anaesthesia in 38.6% of cases, compared to those with less experience (6.8%) (P=.037). One in 4 of those who chose general anaesthesia used ultrasound-guided interfascial blocks (27.5%). The local anaesthetic most used in intradural anaesthesia was hyperbaric bupivacaine (70.8%) at doses higher than 7mg. CONCLUSION: Intradural anaesthesia with hyperbaric bupivacaine was the technique most chosen by anaesthesiologists for the management of inguinal hernia surgery. The anaesthetic techniques chosen among the different hospitals did not follow a homogenous distribution. In this survey, there was a tendency to choose the technique associated with the experience of the anaesthesiologist.
Assuntos
Anestesiologistas , Hérnia Inguinal/cirurgia , Herniorrafia , Padrões de Prática Médica/estatística & dados numéricos , Procedimentos Cirúrgicos Ambulatórios , Analgesia/métodos , Anestesia Geral/estatística & dados numéricos , Raquianestesia/estatística & dados numéricos , Anestésicos Locais/administração & dosagem , Bupivacaína/administração & dosagem , Pesquisas sobre Atenção à Saúde , Humanos , Injeções a Jato , Ambulatório Hospitalar/estatística & dados numéricos , Dor Pós-Operatória/tratamento farmacológico , Utilização de Procedimentos e Técnicas/estatística & dados numéricos , EspanhaRESUMO
We report a case of a 35-years-old man who presented a massive haemothorax and hypovolemic shock following cardiac surgery, from spontaneous rupture of a phrenic artery. A quick diagnosis and immediate intervention is crucial to manage the patient.
Assuntos
Procedimentos Cirúrgicos Cardíacos , Diafragma/irrigação sanguínea , Hemotórax/etiologia , Complicações Pós-Operatórias/etiologia , Doenças Vasculares/complicações , Adulto , Artérias , Humanos , Masculino , Ruptura EspontâneaRESUMO
OBJECTIVE: To describe the anaesthesia/sedation complications during gastrointestinal endoscopy, as well as comparing scheduled procedures versus urgent procedures. METHODS: A protocol was developed to define the anaesthesia/sedation in gastrointestinal endoscopy, where the anaesthetist should always be present. These include ASA 3 and 4 patients, complex tests such as polypectomies, endoscopic retrograde cholangiopancreatography (ERCP) or endoscopic ultrasound, deep sedation, or patients with probable difficult airway management. An analysis was made of the safety based on the complications recorded from the data directly collected automatically from the monitors, both during the sedation and in the recovery unit. An analysis was also performed on the risk factors associated with cardiorespiratory complications, the effectiveness based on the completed tests and the overall level of satisfaction through an interview using a satisfaction scale. RESULTS: The study included a total of 3746 patients over a 7 year-period. The incidence of major complications was low, especially haemodynamic and respiratory complications. An incidence of hypoxaemia of 3% was found in scheduled endoscopy versus 5.7% in urgent endoscopy (P<.05). The rate of hypotension was also low, with significant differences between scheduled and urgent endoscopy (6.4% vs. 18.8%, P<.001). In present study, no test had to be suspended due to poor patient tolerance, and the satisfaction was high in more than 99% of cases. CONCLUSION: The participation of the anaesthetist in sedation for gastrointestinal endoscopy has shown excellent results in this study, in terms of safety and efficacy, mainly in the most serious patients and complex tests, as well as a high level of satisfaction.
Assuntos
Anestesiologia , Sedação Profunda/efeitos adversos , Endoscopia Gastrointestinal , Satisfação do Paciente , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Resultado do TratamentoRESUMO
Lateral approaches to the sciatic nerve through the popliteal fossa have recently been described as useful for providing adequate anesthesia and postoperative analgesia for foot and ankle surgery. Numerous publications have appeared on the approach in recent years, proposing new anatomical landmarks to facilitate location of the nerve, reduce the rate of complications, and increase the rate of success. When the lateral popliteal approach has been compared to other approaches to the sciatic nerve, similar success rates have been observed. However, when this technique is used certain factors must be borne in mind because they can influence both latency time and success. This review describes the lateral popliteal approach, its main variations, the factors that can affect latency time or success, and the possibility of providing continuous analgesia. We also sought to compare this approach to other techniques for blocking the sciatic nerve.
Assuntos
Bloqueio Nervoso/métodos , Nervo Isquiático , HumanosRESUMO
Corticosteroids been used frequently in pain treatments since the middle of last century (1952). Due to a review of the complications as a result of their application in epidural injections, the United States of America Food and Drug Administration (FDA) issued an «alert controversy¼ requesting that a warning label should be added to injectable corticosteroids, where risks must be described (loss of sight, brain damage, paralysis and death) when administering by this route. It must be mentioned that there are different types of corticosteroids with diverse characteristics, which as a result, may produce different side-effects. Due to the aforementioned developments, the controversies that have arisen, and the lack of well-conducted studies on the use of steroids in epidural injections, we must begin by reviewing their indications in different pain conditions.
Assuntos
Dor Crônica/tratamento farmacológico , Corticosteroides , Glucocorticoides , Humanos , Injeções Epidurais , Estados Unidos , United States Food and Drug AdministrationRESUMO
La alta incidencia de insuficiencia respiratoria aguda en el contexto de la pandemia por COVID-19 ha conllevado el uso de ventilación mecánica hasta en un 15%. Dado que la traqueotomía es un procedimiento quirúrgico frecuente, este documento de consenso, elaborado por 3 Sociedades Científicas, la SEMICYUC, la SEDAR y la SEORL-CCC, tiene como objetivo ofrecer una revisión de las indicaciones y contraindicaciones de traqueotomía, ya sea por punción o abierta, esclarecer las posibles ventajas y exponer las condiciones ideales en que deben realizarse, y los pasos que considerar en su ejecución. Se abordan situaciones regladas y urgentes, así como los cuidados postoperatorios
The current COVID-19 pandemic has rendered up to 15% of patients under mechanical ventilation. Because the subsequent tracheotomy is a frequent procedure, the three societies mostly involved (SEMICYUC, SEDAR and SEORL-CCC) have setup a consensus paper that offers an overview about indications and contraindications of tracheotomy, be it by puncture or open, clarifying its respective advantages and enumerating the ideal conditions under which they should be performed, as well as the necessary steps. Regular and emergency situations are displayed together with the postoperative measures
Assuntos
Humanos , Traqueotomia/métodos , Infecções por Coronavirus/cirurgia , Síndrome Respiratória Aguda Grave/cirurgia , Coronavírus Relacionado à Síndrome Respiratória Aguda Grave/patogenicidade , Insuficiência Respiratória/cirurgia , Pandemias/estatística & dados numéricos , Respiração Artificial/métodos , Manuseio das Vias Aéreas/métodosRESUMO
A patient with carcinoma of the lower third of esophagus suffered an extensive tracheal tear during transhiatal esophagectomy without thoracotomy, with severe impairment of ventilatory and hemodynamic status. A right thoracotomy was required for the repair of the tracheal lesion, which extended to the origin of left bronchus. During the maneuvers for bronchial intubation, the hypoxia worsened and cardiac arrest caused by ventricular fibrillation appeared. The arrhythmia was reverted. Operative mortality of transhiatal esophagectomy without thoracotomy is 8%. Pneumothorax is the most common operative complication. Tracheal laceration is reported in 1% of cases; usually it is not severe and is easily treated, although it can have significant severity and result in death as in the present case. After the operation, the patient persisted hemodynamically unstable, developing a new gasometric deterioration and bilateral pleural effusion, with impairment of coagulation. The patient died 39 hours after operation. The anesthetic management of peroperative tracheal tear is reviewed.
Assuntos
Anestesia , Carcinoma de Células Escamosas/cirurgia , Neoplasias Esofágicas/cirurgia , Complicações Intraoperatórias/etiologia , Traqueia/lesões , Esôfago/cirurgia , Humanos , Masculino , Pessoa de Meia-Idade , RupturaRESUMO
Even though peripheral nerve blocks (PNB) on the lower limb offer advantages over neuroaxial blockades and general anesthesia, their use has not been fully established. The infrequency with which PNBs are used may be due to inadequate learning, the need to make several injections, the time until onset of block, or anesthesiologists' and surgeons' lack of familiarity with the benefits of regional blocks. Interest seems to have increased in recent years, as numerous publications have focused on lower limb PNBs for surgery and postoperative analgesia. Our aim was to review the main approaches used and the indications for each.
Assuntos
Analgesia , Anestesia , Perna (Membro)/cirurgia , Bloqueio Nervoso , Dor Pós-Operatória/prevenção & controle , Nervos Periféricos , Humanos , Perna (Membro)/inervaçãoRESUMO
Transoesophageal echocardiography is a new technique that allows continuous and noninvasive assessment of cardiac function during surgery. More recently this technique is being used to detect the presence of external objects into the cardiac cavities. We report a case of Swan-Ganz catheter knotting confirmed by this echocardiography technique. He was a 57 year old male with previous history of arterial hypertension and ischemic heart disease who was scheduled for surgery because poor response to medical therapy. After anesthetic induction a thermodilution catheter was introduced percutaneously into the right internal jugular vein under continuous pressure monitoring from the distal catheter hole. In view of the difficulties in introducing the catheter into the pulmonary artery an intravascular catheter knotting was suspected and a bidimensional transesophageal echocardiogram confirmed the diagnosis. During extracorporeal circulation the catheter was withdrawn through a right auriculotomy. Monitoring with a Swan-Ganz catheter, as other invasive monitoring techniques, is followed by a certain degree of complications which should be avoided by a careful manipulation. Echocardiography is a valuable diagnostic procedure to identify the position of monitoring catheters into the cardiac cavities.
Assuntos
Cateterismo de Swan-Ganz/efeitos adversos , Ecocardiografia/métodos , Monitorização Intraoperatória , Átrios do Coração/cirurgia , Humanos , Anastomose de Artéria Torácica Interna-Coronária , Masculino , Pessoa de Meia-IdadeRESUMO
Classically, the cardiac output is measured by the thermodilution method, employing a standard volume of 5% D/W at 4 degrees C. Recently, however, a room-temperature (17-24 degrees C) measurements have been used, in such a way that a lower gradient between the injectate and the patient temperature is established. This lact could question the sensitivity and reliability of the technique evaluated. We have studied 20 patients undergoing different operations, in whom the cardiac output was measured by injecting a standard volume of 5 ml 5% D/W at room-temperature or at 5 degrees C, randomly assigned, in order to evaluate any difference between the two techniques. Over a total of 100 cardiac output determinations taken in normothermic conditions (19-24 degrees C) the mean was 4.24 +/- 1.13 l/min (means +/- SD). In hypothermic conditions the cardiac output was 4.28 +/- 1.14 l/min (means +/- SD). Results showed no statistical difference between both methods.