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Crit Care Med. Author manuscript; available in PMC 2012 June 1.
Published in final edited form as:
PMCID: PMC3180919
NIHMSID: NIHMS285800

Secondary Prevention in the Intensive Care Unit: Does ICU Admission Represent a “Teachable Moment?”

Abstract

Objective

Cigarette smoking and unhealthy alcohol use are common causes of preventable morbidity and mortality that frequently result in admission to an intensive care unit. Understanding how to identify and intervene in these conditions is important because critical illness may provide a “teachable moment.” Furthermore, the Joint Commission recently proposed screening and receipt of an intervention for tobacco use and unhealthy alcohol use as candidate performance measures for all hospitalized patients. Understanding the efficacy of these interventions may help drive evidence-based institution of programs, if deemed appropriate.

Data Sources

A summary of the published medical literature on interventions for unhealthy alcohol use and smoking obtained through a PubMed search.

Summary

Interventions focusing on behavioral counseling for cigarette smoking in hospitalized patients have been extensively studied. Several studies include or focus on critically ill patients. The evidence demonstrates that behavioral counseling leads to increased rates of smoking cessation but the effect depends on the intensity of the intervention. The identification of unhealthy alcohol use can lead to brief interventions. These interventions are particularly effective in trauma patients with unhealthy alcohol use. However, the current literature would not support routine delivery of brief interventions for unhealthy alcohol use in the medical ICU population.

Conclusion

ICU admission represents a “teachable moment” for smokers and some patients with unhealthy alcohol use. Future studies should assess the efficacy of brief interventions for unhealthy alcohol use in medical ICU patients. In addition, identification of the timing and optimal individual to conduct the intervention will be necessary.

“The doctor of the future will give no medicine but will interest his patients in the care of the human frame, in diet, and in the cause and prevention of disease.” - Thomas Edison

Introduction

More than one-fifth of the annual deaths in the United States are attributable to cigarette smoking and alcohol consumption. Despite recent public health efforts, annual healthcare expenditures for these conditions exceed $100 billion and mortality rates remain essentially unchanged (15). Unfortunately, these treatable conditions lead to frequent encounters with critical care providers. Involvement of critical care providers in screening and initiating treatment for tobacco smoking and unhealthy alcohol use is important because admission to the ICU may represent a “teachable moment” wherein patients feel vulnerable and are willing to change their behaviors. We will review the data on the identification of hospitalized and critically ill patients who smoke or have unhealthy alcohol use. Subsequently, we discuss the controversies that surround the utilization of interventions during their hospital stay and whether these therapies can improve morbidity and mortality following discharge, thus leading to secondary prevention. While most studies of intervention focus on hospitalized patients, many successfully incorporate critically ill patients into systematic screening and intervention.

We searched PubMed from 1970 until 2010 for published work relevant to this subject. We entered the terms “brief intervention,” “counseling,” “behavioral counseling,” “intensive counseling,” and “behavioral therapy” into a search. These terms were then grouped together, identifying over 100,000 articles. We then entered search terms specific to unhealthy alcohol use and smoking and individually cross-matched them with intervention or counseling-related articles. We focused on articles published in the past 10 years. Additionally, the references of retrieved articles were reviewed and we selected additional articles deemed to be relevant.

Brief Interventions, Motivational Interviewing, and a “Teachable Moment”

Brief interventions (BIs) refer to 10 to 15 minute sessions in which healthcare professionals (e.g. physicians, nurses, social workers, or psychologists) provide counseling, feedback, advice, and goal-setting (6). Brief interventions have been applied to a number of risky behaviors including cigarette smoking and problem drinking (7). When risky behaviors are identified during a clinical encounter, a BI may be a “teachable moment” for the patient regardless of whether the patient is seeking help for that particular problem (8). While there is no consensus as to the content, BIs frequently incorporate the techniques of motivational interviewing (MI) developed by Miller for the treatment of substance abuse (9). MI is patient-centered, builds trust, and focuses on increasing readiness to change. Readiness to change is classified into five stages based on the transtheoretical model (Figure 1). The techniques of MI include reflective listening and eliciting motivational statements from patients by exploring both sides of a patient's ambivalence (7). An important component of MI is empathy on the part of the healthcare provider. Alcohol consumption one year following the delivery of a brief intervention using MI is inversely correlated to the amount of empathy expressed by the physician (10). Conversely, confrontational approaches have a deleterious correlation with the amount of alcohol consumption at 12 months (11).

Figure 1
The Transtheoretical Model describes a sequence of steps in successful behavior change using stages of change. Patients may not move through the stages in a linear manner and may relapse.

In studies of interventions for cigarette smoking or unhealthy alcohol use that include ICU patients, the intervention is generally delivered following the resolution of critical illness but prior to discharge home (1215). Although interventions have been successfully implemented in critically ill patients, potential barriers exist. Some of these barriers are well-described in the outpatient or emergency department setting and several may be applicable to the ICU. Healthcare providers perceive a lack of time (16) as well as a lack of knowledge and confidence in providing appropriate treatments as barriers to implementation (17). While healthcare providers fear that addressing sensitive issues with patients will upset them (18), patients are generally positive about screening (19). A perceived lack of time as well as a lack of confidence in identification and treatment can and have been overcome in the outpatient clinic as well as in the hospital setting (18, 20). However, future studies will need to address these barriers in the ICU.

Cigarette Smoking

Smoking is the leading cause of preventable morbidity and mortality in the United States and is responsible for 443,000 annual deaths (21). After a period of steady decline, smoking rates have reached an unfortunate plateau for the last 5 years with 20.6% of the US population being current smokers in 2009 (22). To address this epidemic, current guidelines from the United States Department of Health and Human Services recommend that every healthcare provider screen patients for tobacco use at each encounter (23). A 2004 report from the Surgeon General concluded that epidemiologic evidence was sufficient to link smoking with multiple diseases that commonly result in ICU admission (24). The prevalence of smoking in ICU patients is 22–46% in prospective studies where smoking rates are reported. These studies reveal that critical care providers encounter current smokers at a higher rate than the general population (2528). Similarly, epidemiologic studies strongly link smoking with an increased risk and duration of hospitalization. Importantly, this risk is attenuated in former smokers highlighting the potential benefits of smoking cessation (2931)

Diagnosis and Identification

The National Health Interview Survey is used to estimate annual smoking rates in the United States and defines a current smoker as somebody who has smoked more than 100 cigarettes in their lifetime and currently smokes every day or almost every day (32). Although any amount of smoking is considered detrimental to health, there are formal criteria for the diagnosis of nicotine dependence established by the Diagnostic and Statistical Manual IV (DSM IV) and the International Classification of Diseases, 10th Edition (ICD-10) (33). Withdrawal symptoms, difficulty controlling use, higher prioritization of nicotine use, and persistent use despite detrimental effects are central to the diagnostic criteria. In the only study to assess smoking history in critically ill patients, 21% of non-smokers identified by history obtained from a patient, surrogate, or the medical chart were determined to be current smokers by levels of serum cotinine or urine 4-(methylnitosamino)-1-(3-pyridyl)-1-butanol (34). While diagnostic tools for the identification of current smokers in the ICU require further study, all patients who are identified as smokers should be offered smoking cessation therapy.

Treatment

The first step in offering treatment for smoking cessation is to ask about tobacco use. This is emphasized in a brief intervention framed by the “5 A's” model of treating tobacco use and dependence advocated by guidelines from the U.S. Surgeon General (Table 1) (23). Unfortunately, studies demonstrate that documented smoking histories are only obtained in 66–75% of hospitalized patients (3536). Identification of current smokers is important because only 20–30% of smokers who make a quit attempt utilize therapies proven to double or triple abstinence rates (37). Once a current smoker has been identified in the hospital, tobacco use or dependence should be added to the admission problem list and a brief intervention should be performed. However, a brief intervention is only effective when combined with more intensive behavioral counseling for hospitalized patients (3839).

Table 1
The “5 A's” model for treating tobacco use and dependence (Revised from reference 14).

Behavioral counseling in support of a quit attempt for a hospitalized smoker has been studied in numerous randomized controlled trials. There are typically three components of behavioral counseling: skills training, intra-treatment social support, and extra-treatment social support (4041). In most studies conducted in hospitalized patients, a brief intervention is delivered by a physician. Follow-up behavioral counseling is then delivered by a nurse who is typically a member of the study team (39, 4244). The techniques of motivational interviewing and the concepts of the transtheoretical model discussed above are frequently incorporated into smoking cessation counseling for hospitalized patients (4547). A recent systematic review of 27 studies assessing the efficacy of behavioral counseling found that its efficacy is based on intensity (Table 2). Two of these studies explicitly excluded ICU patients (45, 48), three focused on ICU patients (1214), and the remainder do not explicitly exclude ICU patients. Only studies that included intensive counseling with more than 1 month of follow-up post-discharge had a statistically significant effect, with a 65% increase in the odds of successful smoking cessation (49). Although many of the studies were conducted in patients with cardiovascular disease, the effect of intensive counseling on smoking cessation persisted regardless of admission diagnosis and was also independent of the provision of pharmacotherapy. In addition to increasing the rate of smoking cessation, intensive interventions may also decrease the rate of re-hospitalization and improve mortality (50).

Table 2
Behavioral Counseling for smoking cessation. The pooled effects of 27 studies of behavioral counseling for smoking cessation in hospitalized patients.

Although the effect of intensive counseling is not isolated to patients with cardiovascular disease, secondary prevention may be particularly important in this population. Smoking cessation leads to a marked reduction in mortality for patients with coronary artery disease, including patients with left ventricular dysfunction following acute myocardial infarction (43, 5152). Unfortunately, simply complying with the current Joint Commission Standards for the provision of smoking cessation may not be sufficient to affect outcome. In an analysis of a prospective database including nearly 2500 patients with acute MI, there was no correlation between the documentation of smoking cessation counseling and successful smoking cessation at 6 months or 1 year (53). There are several potential reasons for this finding, though one may be the lack of a provision for intensive counseling in the Joint Commission quality performance measures. Recently proposed revisions of these measures address this shortcoming by adding a provision for follow-up after discharge and seeking to extend screening and intervention for smoking to all hospitalized patients.

The gap between current evidence and practice for smoking cessation counseling in hospitalized patients unfortunately persists. In one recent study, only 17% of hospitalized smokers received smoking cessation counseling (54). In a large, urban academic training hospital, only 48% of active smokers received smoking cessation counseling during an admission for a COPD exacerbation (55), despite evidence linking smoking cessation to a decreased rate of COPD exacerbation (56). Strategies including audit and feedback, the use of computers and reminders, substitution of tasks, financial interventions, and patient-mediated interventions may aid in the effective implementation of smoking cessation programs (5758). Another strategy may be to incorporate outpatient providers and quitlines in therapy following hospital discharge (59). The incorporation of ICUs into hospital-wide smoking cessation programs should be considered. ICU nurses specifically requested they be included in training after initial exclusion from the implementation of the inpatient Veteran Administration's Tobacco Tactics program. The training of nurses in this study led to a feeling of empowerment and enthusiasm in delivering smoking cessation to patients (54).

Nicotine replacement therapy (NRT), now available in several different forms, is effective in increasing rates of abstinence in outpatient smokers, though the few studies performed in inpatients have not demonstrated a benefit (6064). However, assessing the risk to benefit ratio of providing NRT to ICU patients may be particularly unique. A retrospective case-control study suggested an increase in mortality (20% vs 7%) in critically ill patients provided NRT when compared to a control group matched based on severity of illness and age (65). Unmeasured confounding may be responsible for these findings and there are no prospective or randomized studies in the ICU population. Additionally, the benefits of NRT in ICU patients may extend beyond smoking cessation. Prospective observational studies demonstrate an association between current smoking and delirium or agitation, potentially mediated by nicotine withdrawal (25, 27). Prospective randomized controlled trials examining the use of NRT in ICU patients to prevent the development of delirium and agitation and improve smoking cessation rates in ICU survivors could help ICU providers more definitively weigh the risks and benefits of NRT.

Unhealthy Alcohol Use

Unhealthy alcohol use is common in patients admitted to the ICU and is responsible for up to 40% of ICU admissions (66). The systemic effects of heavy alcohol use result in an increased risk of hospitalization(29) and predispose to multiple conditions that result in ICU admission including the acute respiratory distress syndrome (67), septic shock (68), and nosocomial infection (6970). However, physicians often fail to recognize alcohol-related problems in patients admitted to the hospital (71). A recent proposal by the Joint Commission to include screening, brief intervention, and referral to treatment for unhealthy alcohol use as a quality measure in all hospitalized patients has been the source of significant controversy because of the mixed effects of BI in various hospitalized patient populations (7274). This proposal, the detrimental effects of alcohol in multiple critical care settings, and the prevalence of unhealthy alcohol use in the ICU demand that critical care providers be familiar with the diagnosis of unhealthy alcohol use and the utility of BI in various ICU populations.

Definitions and Identification

There is a spectrum of alcohol use ranging from abstinence to alcohol dependence (Table 3). Any consumption of alcohol in excess of recommended amounts is referred to as unhealthy alcohol use (6). The severity of unhealthy alcohol use ranges from risky use to the most severe form, alcohol dependence. Alcohol abuse and alcohol dependence are often collectively referred to as alcohol use disorders (AUD). The ICD-10 and DSM-IV contain commonly used criteria for the diagnosis of alcohol abuse, and alcohol dependence (75). The DSM-IV and ICD-10 criteria have high reliability, validity, and concordance for the diagnosis of alcohol dependence (76).

Table 3
The spectrum of unhealthy alcohol use.

The Alcohol Use Disorders Identification Test (AUDIT) is a ten question survey that was developed by the World Health Organization and has been validated in multiple languages and healthcare settings (77). When using a score ≥ 8, the reported sensitivities range from 50–90% and specificity is approximately 80% for the identification of unhealthy alcohol use (76). In trauma patients, a cutoff of 5 for women yields a similar sensitivity and specificity as a cutoff of 8 for men (78). AUDIT surveys completed by a proxy have a high percentage of agreement in trauma patients. The level of agreement is highest in spouses, co-habitating significant others, and those with daily personal contact (79). Several laboratory tests including blood alcohol concentration, liver function tests, mean corpuscular volume, gamma-glutamyltransferase, and carbohydrate deficient transferrin may be abnormal in patients with AUDs, but lack sufficient sensitivity and specificity to be used for screening and diagnostic purposes in the ICU (8083).

Trauma Patients

A blood alcohol level is not sufficiently sensitive nor specific to identify the one-half of hospitalized trauma patients who have an AUD (8486). An AUD increases the rate of complications in trauma survivors including infection or the need for an operation, and increases the length of ICU stay (8788). Whether this is true for patients acutely intoxicated with alcohol is controversial in the trauma literature (8992). Importantly, acute alcohol intoxication and AUDs are the most important predictors of readmission for trauma, conferring a relative risk of 2.5 to 3.7 that of patients without an alcohol-related diagnosis (9394).

The role of alcohol in readmission coupled with the high prevalence of AUDs in patients admitted to the hospital for trauma led to an interest in the role of BIs in trauma patients. In a randomized trial of BI that included ICU patients, trauma patients who received an intervention consumed nearly 15 fewer alcoholic beverages per week than patients in the control group 12 months after discharge. This was coupled with a 47% reduction in injuries. The BI was performed by a psychologist on or near the day of discharge and incorporated the techniques of MI. The effect was mostly confined to patients with risky alcohol use (15). Brief interventions also halve the rate of arrests for driving under the influence following an admission for trauma related to a motor vehicle crash (95). The implementation of screening and BI in trauma centers is feasible (96). Furthermore, screening and BI in trauma centers is cost-effective and leads to an average savings of $89 for each patient screened (97). Based on the high prevalence of AUDs in hospitalized trauma patients and the efficacy, feasibility, and cost-effectiveness of BI, the American College of Surgeons now requires screening and BI services for unhealthy alcohol use for Level I Trauma designation (98).

Medical Patients

There is a high prevalence of patients with alcohol-related problems in the medical ICU and heavy alcohol consumption increases the risk of morbidity and mortality (68). Brief interventions decrease alcohol consumption and healthcare utilization in patients with risky alcohol use when delivered opportunistically to outpatients (99). It would, therefore, seem logical that the period of abstinence offered by a hospitalization for a medical illness may provide a “teachable moment.” Although no studies have specifically assessed the efficacy of BI in medical ICU patients, numerous studies of BI in medical inpatients fail to demonstrate a reduction in alcohol consumption following hospital discharge (100). In a recent large randomized trial in medical inpatients, BI did not increase the proportion of patients receiving alcohol assistance when compared to usual care (44% vs 49%) (101). A potential reason for the lack of efficacy in medical inpatients may be that the spectrum of unhealthy alcohol use in medical inpatients is skewed toward patients with alcohol dependence, a group that may not respond to BI (102). Regardless, the current evidence would not support the systematic implementation of BI for medical inpatients.

Conclusion

Smoking and unhealthy alcohol use are public health problems that commonly result in critical illness. Reliable screening systems can lead to identification of these treatable conditions in patients admitted to the ICU. Addressing smoking through the delivery of intensive interventions and, when appropriate, the use of pharmacotherapy can lead to a significant improvement in smoking cessation rates. Appropriately delivered brief interventions can have a dramatic effect on alcohol consumption in trauma patients and reduce trauma recidivism, but studies do not conclusively show an effect when delivered to medical inpatients. If performance measures are to be evidence-based, the current level of evidence would not completely support the inclusion of medical ICU patients in screening and BI efforts for unhealthy alcohol use (103). Future studies should address the efficacy of BI in medical ICU patients and the optimal timing of these interventions. Potential moderators and mediators of the efficacy of BI, such as the type of healthcare provider providing the intervention, will also be important. The effective implementation of interventions deemed to be efficacious will also need to overcome barriers to implementation – some unique to critical care and others proven to be surmountable in other healthcare settings.

Acknowledgments

This study was funded by the NIH.

Footnotes

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The authors have not disclosed any potential conflicts of interest.

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