Demographics, Diagnoses, Care Patterns, and Outcomes of Patients Admitted to a Cardiac Intensive Care Unit in a High-Volume Referral Tertiary Center in Latin America

Background Single and multi-center studies have described substantial changes in the landscape of health care in cardiac intensive care units (CICU). Few reports have quantitatively characterized current diagnoses in a contemporary CICU in Latin America. This study aims to describe demographics, diagnoses, care patterns, and outcomes in patients admitted to a CICU in a high-volume center in South America. Methods A total of 1629 consecutive patients admitted to CICU from December 2017 to April 2020 were included in a prospective registry. The variables analyzed included demographic data, admission and final diagnoses, management, and outcomes. Results Among 1629 participants, 32.4% were women, and the median age was 62 years (53-71). Admissions were due to primary cardiac causes in 1335 (81.9%), postsurgical care in 13.3%, and a combination of general and cardiac diagnoses in 4.8% of patients. The most frequent diagnosis on admission was acute coronary syndrome (ACS) (35.7%). Primary reasons for CICU admission were postprocedural observation (PPO) (31.8%), diagnosed or suspected ACS (31.7%), heart failure (10.1%), postsurgical management after cardiovascular surgery (8.9%), arrhythmia (5.8%), shock (4.5%) and cardiac arrest (CA) (1.2%). Advanced CICU therapy requirements were ventilatory assistance (19.3%) and vasoactive or inotropic drug use (19.6%). The overall mortality rate was 6.4%. Admission diagnoses associated with the highest mortality rates were CA (52.6%), noncardiogenic shock (39.5%), and cardiogenic shock (32.3%). Notably, patients admitted solely for PPO had a mortality rate of 0.8%. Conclusions In a contemporary CICU from a high-volume reference center in South America, the most frequent diagnosis was an ACS, although it represented only one-third of the admissions. One-fifth of admissions required advanced CICU therapies. CA and shock on admission carried a poor prognosis. We identified PPO as a substantially low-risk population.