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Intrahospital transport of patients on invasive ventilation: cardiorespiratory repercussions and adverse events

Abstracts

OBJECTIVE: To determine the occurrence of cardiorespiratory alterations and to identify adverse events during the intrahospital transport of patients on invasive ventilation. METHODS: A prospective observational non-randomized study was conducted at two tertiary hospitals between April of 2005 and December of 2006. We included patients on invasive ventilation who required intrahospital transport during the study period. Exclusion criteria were as follows: being under suspicion of brain death; being submitted to alternate periods of mechanical ventilation/nebulization via a T-piece; and being transported to the operating room. Prior to and after transport, we evaluated blood gas analysis results, vital signs, use of medications by means of a continuous infusion pump, parameters regarding the mechanical ventilator, duration of transport, transport distance and number of professionals involved. RESULTS: We included 48 patients in a total of 58 intrahospital transports. Relevant cardiorespiratory alterations were identified in 39 transports, totaling 86 episodes, as well as 16 adverse events related to equipment or personnel failure, such as problems related to batteries and to miscommunication. CONCLUSIONS: During the intrahospital transport of patients on invasive ventilation, cardiorespiratory alterations were common (67.2%), and adverse events occurred in 75.7% of the transports.

Patient transfer; Intensive care; Respiration, artificial; Ventilators, mechanical


OBJETIVO: Verificar a ocorrência de alterações cardiorrespiratórias e identificar eventos adversos durante o transporte intra-hospitalar de pacientes sob ventilação invasiva. MÉTODOS: Estudo observacional prospectivo não-randomizado, conduzido em dois hospitais terciários, entre abril de 2005 e dezembro de 2006. Foram incluídos pacientes sob ventilação invasiva que necessitaram de transporte intra-hospitalar durante o período do estudo. Os critérios de exclusão foram: estar sob suspeita de morte encefálica; ter sido submetido a períodos de ventilação mecânica e de nebulização em tubo T; e ter sido transportado para o centro cirúrgico. Antes e após o transporte, os seguintes parâmetros foram avaliados: gasometria arterial, sinais vitais, uso de medicamentos através de uma bomba de infusão contínua, parâmetros do ventilador mecânico, duração do transporte, distância percorrida e número de profissionais envolvidos. RESULTADOS: Foram incluídos 48 pacientes, num total de 58 transportes. Observou-se alteração cardiorrespiratória importante em 39 transportes, totalizando 86 episódios, assim como 16 eventos adversos relacionados à falha de equipamento e falha da equipe, dentre eles problemas com baterias e falhas de comunicação. CONCLUSÕES: Durante o transporte intra-hospitalar de pacientes submetidos à ventilação invasiva, alterações cardiorrespiratórias foram frequentes (67,2%), e eventos adversos ocorreram em 75,7% dos transportes realizados.

Transferência de pacientes; Cuidados intensivos; Respiração artificial; Respiradores mecânicos


ORIGINAL ARTICLE

Intrahospital transport of patients on invasive ventilation: cardiorespiratory repercussions and adverse events*

Lea Tami Suzuki ZucheloI; Paulo Antônio ChiavoneII

IProfessor. Centro Universitário da Capital - UNICAPITAL, Capital University Center - São Paulo, Brazil

IIAssistant Professor. Faculdade de Ciências Médicas da Santa Casa de São Paulo - FCMSCSP, Santa Casa School of Medical Sciences in São Paulo - São Paulo, Brazil

Correspondence to

ABSTRACT

OBJECTIVE: To determine the occurrence of cardiorespiratory alterations and to identify adverse events during the intrahospital transport of patients on invasive ventilation.

METHODS: A prospective observational non-randomized study was conducted at two tertiary hospitals between April of 2005 and December of 2006. We included patients on invasive ventilation who required intrahospital transport during the study period. Exclusion criteria were as follows: being under suspicion of brain death; being submitted to alternate periods of mechanical ventilation/nebulization via a T-piece; and being transported to the operating room. Prior to and after transport, we evaluated blood gas analysis results, vital signs, use of medications by means of a continuous infusion pump, parameters regarding the mechanical ventilator, duration of transport, transport distance and number of professionals involved.

RESULTS: We included 48 patients in a total of 58 intrahospital transports. Relevant cardiorespiratory alterations were identified in 39 transports, totaling 86 episodes, as well as 16 adverse events related to equipment or personnel failure, such as problems related to batteries and to miscommunication.

CONCLUSIONS: During the intrahospital transport of patients on invasive ventilation, cardiorespiratory alterations were common (67.2%), and adverse events occurred in 75.7% of the transports.

Keywords: Patient transfer; Intensive care; Respiration, artificial; Ventilators, mechanical.

Introduction

Technological advances have led to considerable improvement in intensive care medicine, in terms of treatment aspects as well as diagnostic techniques. Despite the current sophistication of intensive care units (ICUs), neither all necessary care nor all appropriate exams can be offered at the bedside.(1-5) During prolonged transport, the patient does not receive the same level of intensive care, and this can result in complications.(1,3-18)

When deciding to transport a critically ill patient, the potential benefits should be weighed against the risks to which the patient will be exposed.(5,19-21) Due to these factors, appropriate planning, a well-trained team and the use of reliable equipment are indispensible during the intrahospital transport of critically ill patients, since this is a population at high risk for complications and instability inherent to the underlying disease.

The objective of the present study was to identify cardiorespiratory alterations occurring in patients transported to diagnostic units or during transfers between sectors, as well as to identify the adverse events that occur during intrahospital transport, with the aim of assisting the patient during this phase necessary to the treatment.

Methods

This was an operational study, with a prospective non-randomized design, carried out in the ICUs and in the Semi-intensive Care Units (SICUs) of the Santa Casa Central Hospital in São Paulo, in the period between July and December of 2006, as well as in the ICU and in the SICUs (general and emergency) of the Ipiranga Hospital between April and September of 2005 and between September and December of 2006. Both hospitals are located in the city of São Paulo.

Written informed consent was obtained from the patients, their guardians or family members. The research project and the informed consent form were both approved by the research ethics committees of the institutions involved.

We included all patients on invasive ventilation who required intrahospital transport during the study period.

The exclusion criteria were as follows: being under investigation of brain death; being submitted to alternating periods of mechanical ventilation/nebulization via a T-piece; and having been transported to the operating room due to access-related difficulties in collecting the necessary data within the ICU.

After the medical team had made the decision to transport a patient, the following data were collected: identification; diagnosis; Glasgow coma scale or Ramsay sedation scale score; Acute Physiologic and Chronic Health Evaluation (APACHE) II score; lung injury score; duration of intubation or tracheotomy; medication delivered via a continuous infusion pump (CIP); and transport destination.

The pre-transport period was defined as the moment before initiating the preparation of the patient for transport (prior to the disconnection of the mechanical ventilator and the discontinuation of medication delivered via the CIP).

The post-transport period was defined as the moment after the return of the patient to the ICU and admission by the nursing team (resumption of monitoring, medication delivery and mechanical ventilation).

In the pre-transport and the post-transport periods, the maximum tolerance period for data collection was 15 min.

For patients transported in order to undergo tests, post-transport data were evaluated upon their return to the original units. In the case of one-way transports (transfers between sectors), the post-transport evaluation was conducted upon the arrival of the patient at the destination.

In the pre-transport and post-transport periods, the following parameters were evaluated: blood gas; heart rate (HR); respiratory rate (RR); systolic blood pressure (SBP); diastolic blood pressure (DBP); mean arterial pressure; SpO2; medications delivered via the CIP; mechanical ventilator parameters; the PaO2/FiO2 ratio; transport duration; distance covered; professionals involved (intensivists, residents, physical therapists, nurses and nursing assistants/technicians); and complications.

All units involved in this study presented a similar pattern of transport, and the patients were submitted to intrahospital transport according to the routine of the sector. The type of ventilation used was decided by the team itself, according to the clinical status of the patient and the availability of the equipment in the sector.

Adverse events were defined as any event, expected or not, that affected patient stability. The following criteria were used in order to define cardiorespiratory alterations: > 20 bpm change in HR; > 10 breaths/min change in RR; > 20 mmHg change in SBP; > 20 mmHg change in DBP; > 5% decrease in SpO2; > 0.07 change in pH; > 10 mmHg change in PaCO2; > 10 mmHg decrease in PaO2; > 5% decrease in SaO2; and > 20% decrease in PaO2/FiO2 ratio.

The statistical analysis was conducted using the Mann-Whitney and Kruskal-Wallis tests for comparisons among two and three groups, respectively.

In all tests, the level of significance was set at 5% (p < 0.05).

Results

We evaluated 48 patients, in a total of 58 transports, of which 30 occurred at the Santa Casa Central Hospital in São Paulo and 28 occurred at the Ipiranga Hospital. However, not all variables were considered in the 58 transports. In some cases, these data were not included on the data collection form. In other cases, the data had to be excluded from the analysis. For example, since venous blood gas analysis findings were considered inappropriate and only arterial blood gas analysis results were included, these data were evaluated in only 46 cases.

The descriptive analyses of the demographic and clinical variables are shown in Table 1.

The APACHE II score was used for patient stratification in the characterization of the sample regarding the severity of the patients, without the objective of evaluating pre- and post-transport alterations.(22) Patient scores ranged from 6 to 30, with a mean value of 18.4, which characterizes a varied sample in terms of patient severity.

Neurology patients accounted for 38 (65.5%) of the 58 transports, followed by pulmonology patients (n = 6, 10.3%), gastroenterology patients (n = 4, 6.9%), vascular patients (n = 3, 5.2%) and other patients (n = 7, 12.1%).

Figure 1 shows the origin and destination sectors, as well as the type of ventilation used during transport.


Among the 58 transports, there were 39 cases (67.2%) in which the patient presented at least one episode of relevant cardiorespiratory alteration. A detailed description is shown in Table 2.

Among the 58 transports, there were 13 cases (22.4%) in which the patient was using vasoactive drugs (noradrenaline, dobutamine, dopamine or sodium nitroprusside) delivered via the CIP, which was turned off in only 1 case. In that case, the patient presented a decrease in HR of 25 bpm, an increase in SBP of 80 mmHg and an increase in DBP of 30 mmHg.

The patients were also divided in subgroups and compared regarding the following cardiorespiratory variables: HR, RR, SBP, DBP, SpO2, pH, PaCO2, PaO2, SaO2 and PaO2/FiO2. The subgroups analyzed and the differences found are described in Table 3.

All of the transport teams included at least one physician, and there were two physicians present in one of the transports. In addition, there were nursing assistants/technicians present in all of the transports. In 11 cases and in 1 case, the patients were transported by two assistants/technicians and three assistants/technicians, respectively. A physiotherapist was present in 22 transports, and a nurse was present in 8.

The mean transport duration was 52 min, and the mean distance covered was 325 m.

In 44 of the transports, adverse events (n = 112) were reported. The divisions regarding the nature of the complications were classified as follows: equipment failure; human error; and adverse effects directly related to the patient status (Table 4).

Discussion

The intrahospital transport of critically ill patients for complimentary tests is currently indispensible, and this process must be well planned and executed, in order to minimize the risks to which the patients are exposed. However, in the present study, we found that the appropriate precautions were not always taken.

One of the most alarming results found in the present study was the high incidence of cardiorespiratory alterations-relevant alterations occurred in more than 67% of the transports (total, 86 episodes). This is a worrisome result, not only due to the fact per se-since the population was composed of critically ill patients with instability inherent to the pathology presented-but also due to the poor monitoring of the patients. During most of the transports, we used a pulse oximeter to monitor the patient. However, the oximeter often became imprecise due to interference, temperature drops or decreased perfusion, making its reading impossible or unreliable. In such cases, there was a gap in the monitoring, since there was no other device available to register SpO2.

Continuous and systematized monitoring throughout the transport should be mandatory, so that the magnitude and duration of these alterations, as well as the occurrence of arrhythmias and other electrocardiographic alterations, can be registered with greater precision. Thus, the appropriate measures could be taken as soon as possible, as they are in the ICUs.

In a study evaluating a total of 103 transports,(9) 113 episodes of significant intratransport alterations (requiring intervention) were reported, which underscores the importance of maintaining the level of care and monitoring offered in the ICUs.

In most studies evaluating blood gas alterations, a change in pH, tending toward alkalosis, and a decrease in PaCO2(10,23,24) have been reported. This can be explained by the anxiety or pain of the patient, which increases spontaneous ventilation, or even due to the inability of some transport ventilators to maintain the established tidal volume.

In our study, there were 10 transports (17.2%) in which the patients presented variations in pH of > 0.07, presenting a tendency toward alkalosis in 8 of those 10 cases, and 5 transports (8.6%) in which the patients presented variations in PaCO2 of > 10 mmHg, also presenting hypocapnia in 4 of those 5 cases.

Since, on most occasions, blood gases were collected by the medical team and the nurse, delays in their collection might have occurred in the post-transport period. Such delays could have influenced the post-transport PaCO2, giving the impression that it had been stable.

Some authors reported a tendency toward a decrease in oxygenation during transport.(3,4,13) However, we observed a tendency on the part of the transport team to increase the FiO2 prior to transport, as was done in 20 of the transports. This could explain why we found no statistically relevant alterations in PaO2 or SaO2.

Despite the fact that FiO2 was increased in more than 34% of the transports, we observed a decrease in PaO2 in 56.5% of the patients. Even if we consider that blood gases were not collected immediately after transport, the aim of the team as a whole should be to optimize ventilation and, especially, oxygenation. Therefore, this value might have been even higher than 56.5%.

Nearly half of the patients (44.8%) presented a decrease in the PaO2/FiO2 ratio; in 27.6% of the cases, this decrease represented a change of > 20% in relation to the baseline value.

In the hospitals where the research was conducted, the use of manual ventilation during transport to diagnostic units is not common, since the radiology units are distant from the ICUs. Therefore, in the interest of patient safety, a transport ventilator was used, or the mechanical ventilator itself was employed. Therefore, there were few transports involving manual ventilation, which was primarily used only during transport within the unit.

One group of authors observed a high incidence of complications during patient transports to the tomography sector, which, according to the authors, might be attributed to the physical isolation of the patient during the procedure.(11)

The type of ventilation used seems to affect patient stability during transport.(10,23-26) However, in the present study, no statistically significant differences were found among the types of ventilation used, according to the variables studied. However, the number of transports involving manual ventilation was very small (n = 5).

We found no differences between the use of the transport ventilator and that of the mechanical ventilator itself. It is of note that, in our study, most of the patients presented neurological rather than respiratory complications. The latter group of patients would probably benefit from transport with the mechanical ventilator itself, which would favor the pulmonary mechanics, since it would not be necessary to disconnect/reconnect the patient from the mechanical ventilator/to the transport ventilator, and depressurization of the respiratory system would therefore be avoided.

In one case, the sodium nitroprusside CIP was shut off, due to the technical unfeasibility of transporting the patient together with the CIP. This patient presented major alterations in HR, SBP and DBP. The SBP increased by 80 mmHg, from 140 mmHg to 220 mmHg. This shows that, when technical conditions or the equipment used do not offer total safety to the patients, it is probably better to wait for a more appropriate time to transport the patient. It is important to give the safety and stability of the patient priority over hospital routines and bureaucratic procedures. The patients whose CIPs remained activated did not present relevant variations and, when compared with a group of patients who made no use of vasoactive drugs, no statistical differences were found regarding blood gas or hemodynamic alterations, showing that the patients transported while receiving vasoactive drugs presented the same alterations as did those not receiving such drugs. Therefore, the use of vasoactive drugs, if maintained, is not a contraindication to transport.

Another interesting fact is that, although the CIPs of some patients under sedation had to be switched off during the transport, there was no statistically significant difference, in terms of blood gas and hemodynamic alterations, between those in whom the sedation was maintained and those in whom it was not. This shows that CIP-delivered sedation can safely be discontinued during transport, thereby decreasing the amount of equipment and facilitating the management of the patient.

In the present study, we identified 112 adverse events, of which 16 were related to equipment failure or human error (problems with batteries or communication). These episodes could have been avoided by better planning, especially regarding the batteries for the equipment used during the transport, as well as by better guidelines regarding communication among the teams involved.

One group of authors found that complications were reported in 176 transport reports; there were 191 episodes, 61% of which were attributed to human error; the authors suggested better training of the team.(21)

In another study,(18) intrahospital transport was described as a high-risk procedure associated with possible complications, since, in 33% of the 64 transports evaluated, the patients presented major alterations, evolving to cardiorespiratory arrest in 2 cases. The authors of that study discussed the need for standardizing the transport and the precautions taken during this procedure.

Another group of authors stated that patient transport is safe, and that, in fact, the patients who require transport are those who are more critically ill and therefore evolve to death more rapidly, regardless of whether they undergo intrahospital transport.(27)

In our study, it would have been of interest to include a control group composed of non-transported patients with APACHE II scores equivalent to those of the transported patients, so that we could have determined whether the alterations found in the transported patients were related to patient severity or to the transport itself.

As for the professionals involved in the transport, we observed that a physician was present in all of the transports. However, according to the literature, such physicians should be trained in advanced life support and capable of promptly establishing an artificial airway,(22,23,28-30) which was not always the case in the transports we evaluated. In addition, although all of the transports were also conducted in the presence of a resident, this was often a first-year resident without sufficient experience to deal with critically ill patients.

We conclude that, during intrahospital transport of patients on invasive ventilation, cardiorespiratory alterations often occur. Adverse events occurred in 75.7% of the transports evaluated.

Ideally, all transports would be carried out by trained professionals, principally physicians specialized in intensive care, and the appropriate monitoring of patient vital signs, through the use of an electrocardiograph, pressure monitor, pulse oximeter, etc., would be uninterrupted. In addition, equipment to deal with complications, such as a defibrillator, should routinely be transported together with the patient.

We recommend that additional studies be conducted, and that such studies involve continuous intratransport monitoring of patient vital signs, as well as evaluation and quantification of alterations occurring during transport, so that a protocol for intrahospital transport can be developed.

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  • Endereço para correspondência:
    Léa Tami Suzuki Zuchelo
    Rua Coronel Joaquim Ferreira de Souza, 212, Alto do Mandaqui
    CEP 02419-070, São Paulo, SP, Brasil
    Tel 55 11 2236-3871
    E-mail:
  • *
    Trabalho realizado na Faculdade de Ciências Médicas da Santa Casa de São Paulo - FCMSCSP - São Paulo (SP) Brasil.
  • Publication Dates

    • Publication in this collection
      19 May 2009
    • Date of issue
      Apr 2009

    History

    • Accepted
      23 Sept 2008
    • Received
      14 Mar 2008
    Sociedade Brasileira de Pneumologia e Tisiologia SCS Quadra 1, Bl. K salas 203/204, 70398-900 - Brasília - DF - Brasil, Fone/Fax: 0800 61 6218 ramal 211, (55 61)3245-1030/6218 ramal 211 - São Paulo - SP - Brazil
    E-mail: jbp@sbpt.org.br