[Heart failure: critical patients].

Patients with heart failure in the "real world" are often elderly and with multiple comorbid diseases. These conditions create a dilemma for the physician responsible for the treatment of heart failure and are associated with a substantial underutilization of evidence-based treatments. Clarifying the prognostic impact of comorbidities in heart failure could provide more precise risk stratification and optimize the management of these patients. The negative prognostic impact of concomitant diseases has been shown in several studies: in the TEMISTOCLE study, carried out in Italy on patients hospitalized for heart failure in Internal Medicine and Cardiology wards, the presence of comorbidities was associated with higher in-hospital mortality and prolonged length of stay. In the IN-CHF registry, enrolling out patients with heart failure in a cardiological setting, the rate of coexisting diseases is not very high according to the epidemiological characteristics of this population. Renal impairment, particularly in patients >70 years old, and chronic obstructive pulmonary disease (COPD) are frequent comorbid diseases in heart failure. Renal impairment has been recognized as an independent risk factor for morbidity and mortality in heart failure while the role of COPD is controversial. Patients with renal dysfunction and COPD have largely been excluded from randomized controlled trials for safety reasons, so data are scarce. In the IN-CHF registry the prevalence of elderly patients with renal impairment (serum creatinine > or = 2 mg/dl and age > or = 70 years) is 5.1%; this subgroup of patients has an increased risk for both 1-year death (28.1 vs 11.2%) and hospital admission (34.9 vs 22.5%) compared with the remaining population. The prescription pattern has been evaluated in the last years (2003-2005) and shows that angiotensin system inhibitors (angiotensin-converting enzyme inhibitors and angiotensin receptor blockers) as well as beta-blockers are less prescribed in these patients (78.9 vs 86.1% and 42.2 vs 55.9%, respectively). The prevalence of patients with COPD in the registry was 13.2%: considerable differences in COPD prevalence estimates exist in the general population depending on many factors such as method for diagnosis or lack of agreement on diagnostic criteria. COPD patients were older and with more severe symptoms; with respect to the pharmacological treatment, beta-blockers are significantly less prescribed in COPD patients while a similar proportion of patients are receiving angiotensin system antagonists. The adjusted analysis shows that COPD in not an independent predictor of 1-year mortality in this population while it is independently associated with 1-year all-cause hospitalization. Non-cardiovascular hospital admissions seem to be more influenced by the presence of this comorbidity than cardiovascular admissions.