Table 4.

Acute diagnoses present on index admission and on unplanned readmissions among patients with an unplanned readmission

Diagnosis, % (95% CI)a	Index admissions that preceded readmission n=1,161	Unplanned readmissions n=1,161
Adverse event or complication	6.1 (4.7–7.5)	6.4 (5–7.8)
Arrest, cardiac or respiratory	4.8 (3.6–6.1)	4.2 (3.1–5.4)
Cardiovascular, any	17.1 (15–19.3)	19.8 (17.5–22.1)
Arrhythmia	3.1 (2.1–4.1)	4.7 (3.4–5.9)
Heart failure	2.8 (1.9–3.8)	3.5 (2.5–4.6)
Hypertension, systemic†	2.2 (1.3–3)	3.8 (2.7–4.9)
Hypotension without shock	2 (1.2–2.9)	2.3 (1.4–3.2)
Shock	2.9 (2–3.9)	2.7 (1.7–3.9)
Fluid/electrolyte abnormality	9.6 (7.9–11.3)	9.2 (7.5–10.9)
Gastrointestinal, any	13.4 (11.5–15.4)	14.3 (12.3–16.3)
Liver failure	0.6 (0.2–1)	0.4 (0.1–0.8)
Infection, any	34.2 (31.5–36.9)	35.8 (33.1–38.6)
CNS	3.2 (2.2–4.2)	3.4 (2.4–4.5)
Gastrointestinal	1.1 (0.5–1.7)	1 (0.4–1.5)
Respiratory	23.6 (21.2–26)	24.1 (21.7–26.6)
Sepsis, bacteremia, viremia, fungemia	6.2 (4.8–7.6)	6 (4.7–7.4)
Neurological, any*	20.7 (18.3–23)	27.7 (25.2–30.3)
Cerebrovascular event	3.2 (2.2–4.2)	4.7 (3.5–6)
Encephalopathy†	6.3 (4.9–7.7)	9.3 (7.6–11)
Increased intracranial pressure/cerebral edema	2.5 (1.6–3.4)	2.2 (1.3–3)
Seizure*	13.2 (11.2–15.1)	19.6 (17.3–21.8)
Renal, any	5.2 (3.9–6.4)	6.5 (5–7.9)
Renal failure	2.4 (1.5–3.3)	2.6 (1.7–3.5)
Respiratory, any*	45.5 (42.6–48.3)	55.6 (52.8–58.5)
ARDS/ALI	18 (15.8–20.2)	15.8 (13.7–18)
Bronchospasm	4.1 (3–5.3)	3.6 (2.5–4.7)
Pneumothorax/pleural effusion†	4.4 (3.2–5.6)	7.2 (5.7–8.7)
Upper airway obstruction†	3.4 (2.4–4.5)	5.5 (4.2–6.8)

ALI, acute lung injury; ARDS, acute respiratory distress syndrome; CNS, central nervous system; CI, confidence interval

^†P < 0.05;

^*P < 0.001 by chi² test

^aPatients may have had more than one acute diagnosis