[Incidence and clinical features of patients with comorbidity attended in internal medicine areas].
OBJECTIVE
Our objective was to assess the incidence and clinical features of patients with numerous disorders--comorbidity patients (CP)--and to clinically validate the CP criteria defined by a panel of experts (patients with 2 or more chronic diseases, distributed into seven categories).


METHODS
Prospective observational study of all patients, attended in internal medicine areas of a tertiary teaching hospital, during June 2003. Patients were stratified in 3 cohorts: CP, palliative, and general (GE). Incidence of CP, functional evaluation (at baseline, at admission, and at discharge), and burden of hospital care (by means of urgent and programmed visits, as well as episodes of hospitalization) in the last 12 months were analyzed. A multivariate analysis of predictors of survival and functional deterioration (fall in Barthel's scale > or = 10 points between baseline-discharge values) was performed in the CP cohort.


RESULTS
339 patients (CP cohort: 132; palliative: 52; GE: 155) were included. The overall incidence was 38.9/100 admissions/month. CP were older (75 [11] vs 67 [16]); had higher mortality (19.3% vs 6.1%; relative risk [RR]: 3.66 [95% confidence interval [CI], 1.65-8.13]; lower functional ability at baseline (45 vs 95), at admission (20 vs 75), and at discharge (20 vs 95); higher rates of significant functional deterioration (16% vs 7%; RR = 2.47 [95% CI, 1.15-5.35]); and required more burden of hospital care by means of urgent care (3.6 [3.4] episodes vs 2.4 [1.9]), and hospitalizations (1.9 [1.3] vs 1.5 [1]) than GE patients. Chronic digestive/hepatic diseases (odds ratio [OR] = 48.3 [2.4-980.9], peripheric vascular disease/diabetes with visceral involvement (OR = 5.6 [CI 95%, 1.1-28.6]), and better functional ability at admission were associated with survival. Female gender (OR ) 46.6 [CI 95%, 4.5-486.9]), chronic lung disease (OR = 8.9 [CI 95%, 1.2-64]), and neurologic disease with disability (OR = 8 [CI 95%, 1.1-58.9]), were associated with significant functional deterioration during hospital stay.


CONCLUSIONS
The defined CP criteria were highly accurate in detecting a population of patients with high attention in Internal Medicine areas, high mortality rates, clinical frailty (more need of hospital care), and significant functional deterioration. Barthel's scale identified correctly this group of patients, and was independently associated with survival.
García-Morillo
José Salvador
JS
Unidad Clínica de Atención Médica Integral, Servicio de Medicina Interna, Hospitales Universitarios Virgen del Rocío, 41013 Sevilla, España. salvaymar@vodafone.es
Bernabeu-Wittel
Máximo
M
Ollero-Baturone
Manuel
M
Aguilar-Guisad
Manuela
M
Ramírez-Duque
Nieves
N
González de la Puente
Miguel Angel
MA
Limpo
Pilar
P
Romero-Carmona
Susana
S
Cuello-Contreras
José Antonio
JA
D000368:Aged; D002908:Chronic Disease / Q000453:epidemiology; D015331:Cohort Studies; D015897:Comorbidity; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D015994:Incidence; D007388:Internal Medicine / Q000706:statistics & numerical data; D008297:Male; D015999:Multivariate Analysis; D011446:Prospective Studies