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CoDAS

versão On-line ISSN 2317-1782

CoDAS vol.25 no.1 São Paulo  2013

http://dx.doi.org/10.1590/S2317-17822013000100002 

ORIGINAL ARTICLE ARTIGO ORIGINAL

 

Clinical swallowing assessment in intensive care unit

 

 

Aline Rodrigues PadovaniI; Danielle Pedroni MoraesII; Fernanda Chiarion SassiIII; Claudia Regina Furquim de AndradeIII

IGraduate Program (Masters degree) in Rehabilitation Sciences, Department of Physical Therapy, Speech-Language Pathology and Audiology, and Occupational Therapy, School of Medicine, Universidade de São Paulo - USP - São Paulo (SP), Brazil
IIGraduate Program (PhD) in Rehabilitation Sciences, Department of Physical Therapy, Speech-Language Pathology and Audiology, and Occupational Therapy, School of Medicine, Universidade de São Paulo - USP - São Paulo (SP), Brazil
IIIDepartment of Physical Therapy, Speech-Language Pathology and Audiology, and Occupational Therapy, School of Medicine, Universidade de São Paulo - USP - São Paulo (SP), Brazil

Correspondence address

 

 


ABSTRACT

PURPOSE: To report the results of the full clinical swallowing assessment in acute-care population in a large Brazilian teaching hospital.
METHODS: A prospective, descriptive clinical study was conducted during three months in a 30-bed adult clinical emergency ICU from a large Brazilian teaching hospital. Thirty-five patients consecutively referred to the Speech-Language Pathology Service according to our standard clinical practice were included. A full clinical swallowing assessment was completed and includes a Preliminary Assessment Protocol (PAP), a Dysphagia Risk Evaluation Protocol (DREP) and an Oral Feeding Transition Protocol (OFTP).
RESULTS: In this study, the prevalence of OD in the ICU setting was of 63%, most of which were classified as moderate and moderate-severe (39%). Patients submitted to orotracheal intubation were very frequently referred to swallowing assessment (74%). The results of the statistical analyses revealed clinical indicators that could correctly classify patients as either having or not having OD on clinical tests. These include cough strength, coordination between breathing and speaking, dysphonia severity, and laryngeal elevation. Twenty six patients (74%) completed all protocols. Of these total, 38% were able to eat a regular diet.
CONCLUSION: The practice with standardized protocols adds an important option for the management of oropharyngeal dysphagia in intensive care unit.

Keywords: Speech, language and hearing sciences; Deglutition disorders; Intensive care units; Methods; Deglutition


 

 

INTRODUCTION

Oropharyngeal dysphagia (OD) is potentially life-threatening with consequences such as: malnutrition, dehydration, aspiration pneumonia, increased risk of complications, discharge to nursing home and higher mortality(1). There are also financial costs, including longer length of intensive care unit (ICU), expenses for antibiotics, X-rays, increased nursing time and physician consultations(2,3).

As many as 12-30% of hospitalized patients have dysphagia that results in aspiration of oral contents(4,5). The etiologic agents differ according to the studied population, duration of hospital stay, and time after intubation. The development of post-extubation swallowing dysfunction is well documented in the literature with high prevalence in most studies, ranging from 44 to 87%(6-10). Risk factors include age, pulmonary diseases, tracheostomy, neurological diseases, and head and neck cancer. When patients are admitted to the ICU, they are at increased risk of having more frequent aspiration events because of a variety of factors. These factors include depressed level of consciousness (often caused by excessive analgesia and sedation), forced supine position, and the presence of tracheostomy, nasogastric or endotracheal tubes(11-15).

In most cases, medical assessment, therapy, and management of dysphagia start in the ICU environment. The early identification of the disturbance is necessary for the safe provision of foods, liquids and oral medications(5). Clinical bedside assessment currently is the most widely used form of swallowing assessment. It is used frequently by health professionals as a first-line (and on occasion, as the only) means for investigating a clinical suspicion of a swallowing disorder. It is inexpensive, noninvasive, time efficient, and consumes few resources(16,17).

The full clinical swallowing assessment typically includes gathering information regarding the current swallowing problem, reviewing medical history, observing signs relevant to the patient's medical status, conducting a structural/functional examination of speech and swallowing structures, and observing the patient during trial swallows. Generally, this is recognized as one component of the comprehensive evaluation. The results of this examination determine whether further instrumental assessment of dysphagia is warranted(18).

Screening procedures are generally designed to be quick (∼15minutes), relatively noninvasive, with little risk to patient while identifying the symptoms of dysphagia requiring in-depth diagnostic assessment(19). Few data are available on full clinical swallowing assessment in intensive care unit. The aim of this study was to report the results of the full clinical swallowing assessment in acute-care population in a large Brazilian teaching hospital.

 

METHODS

A prospective, descriptive clinical study was conducted during three months in a 30-bed adult clinical emergency ICU from a large Brazilian teaching hospital. Thirty-five patients who were consecutively referred to the Speech-Language Pathology Service were included in the experiment. This research was done in accordance with the appropriate institutional ethics committee and carried out in conformity with the ethical standards set forth in the Helsinki Declaration of 1975.

All patients were treated according to our standard clinical practice. Thus, all patients who were at increased risk for oral dysphagia (OD) were referred to clinical assessment of swallowing. Some independent or associated risk factors are considered for the development of dysphagia in the ICU: orotracheal intubation for more than 48 hours, tracheostomy, neurological diseases, delirium or another elective clinical condition.

Swallowing assessment in Intensive Care Unit (ICU)

A clinical swallowing assessment was completed under some conditions, based on medical records and report of the multidisciplinary team. The full assessment was performed 24 hours after extubation, if the patient was alert and clinically stable. The full clinical swallowing assessment in ICU of our Institution includes a Preliminary Assessment Protocol(PAP)(20), a Dysphagia Risk Evaluation Protocol (DREP)(19) and an Oral Feeding Transition Protocol (OFTP)(21).

The PAP(20) is an instrument that aims to describe overall aspects of breathing, speech, voice and of the orofacial and cervical structures of individuals undergoing a swallowing evaluation. The purpose of the protocol is to conduct the examiner in the decision process of testing different liquid and food consistencies. The protocol also gives support to understanding the pathophysiology of dysphagia.

The clinical measures of the PAP(20) considered for statistical analyses were: diagnosis; vital signs, alertness; tube feeding; orientation status; ability to follow single-step verbal commands; oxygen saturation; breathing pattern; dependence on oxygen; speech intelligibility; coordination between breathing and speaking; dysphonia; orofacial motor ability, dentition; gag reflex, cough quality, laryngeal elevation and saliva.

The DREP(19) is a protocol for the early detection of dysphagia risk. It includes the controlled offer of water and puree volumes. This instrument aims to guide the speech pathologist during the process of identifying and interpreting alterations of the swallowing process. It also characterizes clinical signs that are suggestive of laryngeal penetration or aspiration, the severity of dysphagia and it helps to determine how the case will be conducted. For the statistical analysis the results of pass/fail and the risk level for dysphagia were considered.

According to this protocol, the classification of dysphagia is based on five levels. The examiner should follow the clinical rationale proposed in each item of the protocol based on the signs presented by the patient. For the classification of dysphagia, the patient must present at least one sign that classifies his/hers swallowing as different from what is described on the previous level:

- Level I - Normal swallowing: Normal for liquid and pasty food for all of the assessed items. Oral feeding is recommended.

- Level II - Functional swallowing: Spontaneous compensations are expected, with mild difficulties for at least one food consistency; absence of signs that are suggestive of aspiration. Oral feeding is recommended, but additional time may be necessary to complete this task.

- Level III - Mild oropharyngeal dysphagia: A swallowing disorder is present; cues are given during the act of swallowing. Small diet modifications are necessary; spontaneous and effective cough is present; mild oral alterations are present with adequate compensation.

- Level IV - Mild to moderate oropharyngeal dysphagia: The risk for aspiration is present; however this is reduced with the use of maneuvers and therapeutic techniques. Needs sporadic supervision to perform therapeutic techniques; signs of aspiration and food consistency restriction; involuntary cough is weak and voluntary cough is strong. The time spent with feeding is considerably longer and supplementary nutrition is indicated.

- Level V - Moderate oropharyngeal dysphagia: Significant risk for aspiration exists. Oral feeding is supplemented with the use of alternative feeding methods; signs of aspiration for both of the tested food consistencies. The patient is able to eat a few food consistencies using specific therapeutic techniques to minimize possible aspiration and/or to facilitate swallowing; needs supervision. Involuntary cough is weak or absent.

- Level VI - Moderate to severe oropharyngeal dysphagia: tolerates only one food consistency with supervision at all times; signs of aspiration needing to use clearing strategies; aspiration of two or more food consistencies; absence of involuntary cough; voluntary cough is weak and ineffective. If lung condition is compromised, the suspension of oral feeding is necessary.

- Level VII - Severe oropharyngeal dysphagia: Oral feeding is not possible. Chokes and has difficulty to recover; presence of cyanoses or bronchospasms; silent aspiration for two or more food consistencies; voluntary cough is ineffective; inability to begin the swallowing process.

The OFTP(21) is used for patients who have obtained good scores in the PAP and DREP. The aim of this protocol is to guide the recommendation for oral or non-oral feeding in patients who are at risk for OD. Its methodology incorporates signs and symptoms commonly observed in the clinical practice of clinicians who work with dysphagia. In addition, it provides information regarding oral intake and effectiveness of therapeutic techniques.

The OFTP(21) is based in the model presented by the American Dietetic Association(22) - the National Dysphagia Diet - that established different levels of food and liquids intake by mouth (Chart 1). For statistical analysis the criteria of pass/fail in each level was adopted, considering the use of therapeutic strategies.

 

 

A complete clinical evaluation was conducted in accordance to Figure 1. The instrumental evaluation of swallowing was indicated whenever the results of the protocols were biased.

Data analysis

The Fisher's Exact Test was used to examine the ability of each single variable of PAP to predict fail in clinical trials of swallowing. The adopted value of significance was of 0.05. EpiInfo statistical software was used for this analysis.

A descriptive analysis is presented for the results obtained in the DREP and OFTP.

 

RESULTS

Disposition of patients

A total of 35 patients were referred for clinical swallowing assessment. All patients exhibited Glasgow Coma Scale above fourteen points. No patient received tracheostomy during hospitalization. Patients presented a mean age of 54 years (SD=20.1), and 51% were female. Table 1 presents the clinical characteristics of the 35 participants correlated with the prevalence of OD. The dysphagia severity classification is illustrated in Figure 2.

 

 

 

 

All patients underwent the procedures determined in the PAP and DREP. Sixteen patients failed at least in one of the textures tested in the DREP. The DREP could not be fully completed in 17% of the patients. The main reasons for the interruption of the tests were ineffective airway clearing and nausea.

Table 2 shows the results for the Fisher's Exact Test applied to the correlation between the clinical conditions assessed by the PAP(20) and the fail results of the DREP(19) (Table 3), as described in the methods section. For this analysis, only the common items for both protocols were considered. These items are described in the same table, as well as the distribution of the results obtained for the 35 participants. The statistical analysis indicates that the most relevant items were: coordination between breathing and speech (p=0.01); presence of dysphonia (p=0.01); involuntary cough (p=0.003) and laryngeal elevation (p=0.01). The results suggest that alterations of these items in the PAP can predict possible fail results in the DREP(15).

 

 

The OFTP(21) was not conducted in nine patients (26%). The main reason was the presence of moderate to severe oropharyngeal dysphagia, determined by the DREP(19) (78%). Twenty six patients (74%) completed all protocols. Of these total, 38% were able to eat a regular diet. The remaining 62% failed or could not be tested at all levels. The main reasons that prevented these patients from eating a regular diet were: necessity for compensatory strategies during swallowing (38%), absence of teeth (38%), reduced alertness (13%), dyspnea (6%), and odynophagia (6%). The OFTP was not conducted in nine patients (26%). The most important reason was the presence of moderate-severe OD during the conduction of the DREP (78%). Table 3 shows the results of full clinical evaluation of swallowing in the ICU.

 

DISCUSSION

Until this moment there is no universally accepted standard OD full evaluation protocol(15) For this study, a sequence of bedside protocols comprising clinical measures already described in the literature were used(12).

Traditionally, videofluoroscopy has been considered the gold standard for swallowing evaluation(17). However, the clinical utility of this test is compromised by the need to transport often fairly ill patients to the radiology department and the requirement for specialized equipment and personnel that are not readily available in many hospitals(24). When looking at developing countries, the prolonged intensive medical and nursing care required by many patients places extra demands on an already stretched healthcare budget(5,17,18,25).

Cervical auscultation is increasingly being used to supplement clinical swallowing assessment. The sounds associated with swallowing have been investigated using accelerometers and microphones for acoustic characteristics and possible prediction of aspiration(10,14,17,26,27). The use of cervical auscultation varies in its reported reliability, and validity in terms of comparison to videofluoroscopic swallow study (VFSS)(17,25,27,28). However, VFSS itself has poor reliability for intra- and interjudge rating.

The literature shows that an average of 50% of patients submitted to orotracheal intubation have OD, especially in elderly(29). A lot of emphasis has been placed on the early identification and best management of OD in acute stroke patients(1,14). However, the situation differs significantly when considering ICU patients who require specific skills of professionals experienced in swallowing rehabilitation(5).

Authors(30) revealed some clinical indicators significantly related to aspiration in stroke patients: dysphonia, dysarthria, abnormal gag reflex, abnormal volitional cough, cough after swallow, and vocal changes after swallow. Other authors(26) reported that reduced laryngeal elevation on trial swallows was identified correctly in 70% of the patients classified as having or not a pharyngeal stage disorder. The coordination between breathing and speaking was not examined in these studies. However, incoordination between respiratory and deglutition functions have been described as an increased risk for aspiration(29,30).

The application of the PAP, DREP and OFTP incorporate measures that are usually observed during the clinical practice of speech pathologists who work with dysphagia. The use of these protocols is based on the methodological principles that are considered the background for a complete clinical swallowing assessment. These principles clarify how to gather information and therefore allow the use of the same method when assessing different patients. They also indicate the possibility of introducing different food consistencies with patients who present risk for dysphagia. The application of clinical protocols that guide the practice of speech pathologists favor the standardization of clinical practice, guarantees the quality of services and collaborates with evidence based practice. However, it must be considered that although these instruments are of easy application and have low cost, they still are considered subjective and therefore need specific training for the correct application.

When looking at developing countries, the prolonged intensive medical and nursing care required by many patients place extra demands on an already stretched healthcare budget. Intervention by a speech pathologist could mean that time in the ICU would be reduced as well as the number of re-admissions due to complication(29,30). Early identification of swallowing disorders is overriding to reduce morbidity in this high risk population(10).

 

CONCLUSION

The results indicate a prevalence of 63% of OD in a clinical intensive care unit. Patients who are submitted to orotracheal intubation were very frequently referred in this setting. However, our findings should be confirmed in further studies of larger cohorts by extensive repetition of the current procedures. The practice with standardized protocols adds an important option for the management of oropharyngeal dysphagia in intensive care unit.

 

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Correspondence address:
Claudia Regina Furquim de Andrade
R. Cipotânea, 51, Campus Cidade Universitária
São Paulo (SP), Brasil, CEP: 05360-160
E-mail: clauan@usp.br

Received: 7/6/2011
Accepted: 11/30/2011
Conflict of interests: None

 

 

Study conducted at the Department of Physical Therapy, Speech-Language Pathology and Audiology, and Occupational Therapy, School of Medicine, Universidade de São Paulo - USP - São Paulo (SP), Brazil.
* ARP was responsible for data collection and tabulation; DPM contributed with data collection and tabulation, and supervised data collection; FCS monitored data collection and contributed com data analysis; CRFA was responsible for the study's project and design, and for general supervision of the execution and manuscript elaboration stages.

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