Objective
To evaluate the prevalence and impact of respiratory infections in cardiogenic shock complicating acute myocardial infarction (AMI-CS).
Methods
Using the National Inpatient Sample (2000–2017), this study identified adult (≥18 years) admitted with AMI-CS complicated by respiratory infections. Outcomes of interest included in-hospital mortality of AMI-CS admissions with and without respiratory infections, hospitalization costs, hospital length of stay, and discharge disposition. Temporal trends of prevalence, in-hospital mortality and cardiac procedures were evaluated.
Results
Among 557,974 AMI-CS admissions, concomitant respiratory infections were identified in 84,684 (15.2%). Temporal trends revealed a relatively stable trend in prevalence of respiratory infections over the 18-year period. Admissions with respiratory infections were on average older, less likely to be female, with greater comorbidity, had significantly higher rates of NSTEMI presentation, and acute non-cardiac organ failure compared to those without respiratory infections (all
p
< 0.001). These admissions received lower rates of coronary angiography (66.8% vs 69.4%,
p
< 0.001) and percutaneous coronary interventions (44.8% vs 49.5%,
p
< 0.001), with higher rates of mechanical circulatory support, pulmonary artery catheterization, and invasive mechanical ventilation compared to AMI-CS admissions without respiratory infections (all
p
< 0.001). The in-hospital mortality was lower among AMI-CS admissions with respiratory infections (31.6% vs 38.4%, adjusted OR 0.58 [95% CI 0.57–0.59],
p
< 0.001). Admissions with respiratory infections had longer lengths of hospital stay (12
7
,
8
,
9
,
10
,
11
,
12
,
13
,
14
,
15
,
16
,
17
,
18
,
19
,
20
vs 6
3
,
4
,
5
,
6
,
7
,
8
,
9
,
10
,
11
days,
p
< 0.001), higher hospitalization costs and less frequent discharges to home (27.1% vs 44.7%,
p
< 0.001).
Conclusions
Respiratory infections in AMI-CS admissions were associated with higher resource utilization but lower in-hospital mortality.