Impact of patient communication problems on the risk of preventable adverse events in acute care settings

Background

Up to 50% of adverse events that occur in hospitals are preventable. Language barriers and disabilities that affect communication have been shown to decrease quality of care. We sought to assess whether communication problems are associated with an increased risk of preventable adverse events.

Methods

We randomly selected 20 general hospitals in the province of Quebec with at least 1500 annual admissions. Of the 145 672 admissions to the selected hospitals in 2000/01, we randomly selected and reviewed 2355 charts of patients aged 18 years or older. Reviewers abstracted patient characteristics, including communication problems, and details of hospital admission, and assessed the cause and preventability of identified adverse events. The primary outcome was adverse events.

Results

Of 217 adverse events, 63 (29%) were judged to be preventable, for an overall population rate of 2.7% (95% confidence interval [CI] 2.1%–3.4%). We found that patients with preventable adverse events were significantly more likely than those without such events to have a communication problem (odds ratio [OR] 3.00; 95% CI 1.43–6.27) or a psychiatric disorder (OR 2.35; 95% CI 1.09–5.05). Patients who were admitted urgently were significantly more likely than patients whose admissions were elective to experience an event (OR 1.64, 95% CI 1.07–2.52). Preventable adverse events were mainly due to drug errors (40%) or poor clinical management (32%). We found that patients with communication problems were more likely than patients without these problems to experience multiple preventable adverse events (46% v. 20%; p = 0.05).

Interpretation

Patients with communication problems appeared to be at highest risk for preventable adverse events. Interventions to reduce the risk for these patients need to be developed and evaluated.Patient safety is a priority in modern health care systems. From 3% to 17% of hospital admissions result in an adverse event,^1–8 and almost 50% of these events are considered to be preventable.^3,9–12 An adverse event is an unintended injury or complication caused by delivery of clinical care rather than by the patient''s condition. The occurrence of adverse events has been well documented; however, identifying modifiable risk factors that contribute to the occurrence of preventable adverse events is critical. Studies of preventable adverse events have focused on many factors, but researchers have only recently begun to evaluate the role of patient characteristics.^2,9,12,13 Older patients and those with a greater number of health problems have been shown to be at increased risk for preventable adverse events.^10,11 However, previous studies have repeatedly suggested the need to investigate more diverse, modifiable risk factors.^{3,6,7,10,11,14–16}Language barriers and disabilities that affect communication have been shown to decrease quality of care;^16–20 however, their impact on preventable adverse events needs to be investigated. Patients with physical and sensory disabilities, such as deafness and blindness, have been shown to face considerable barriers when communicating with health care professionals.^20–24 Communication disorders are estimated to affect 5%–10% of the general population,²⁵ and in one study more than 15% of admissions to university hospitals involved patients with 1 or more disabilities severe enough to prevent almost any form of communication.²⁶ In addition, patients with communication disabilities are already at increased risk for depression and other comorbidities.^27–29 Determining whether they are at increased risk for preventable adverse events would permit risk stratification at the time of admission and targeted preventive strategies.We sought to estimate the extent to which preventable adverse events that occurred in hospital could be predicted by conditions that affect a patient''s ability to communicate.