Proportion of CRI among patients with AMI:
Out of the 744 AMI patients enrolled during the entire study duration,
84 (11.3%) had reported having CRI during the week prior to AMI onset
(Table 2). The majority of participants reporting CRI (77/84; 91.7%)
had developed CRI within three days of AMI onset. The most common
respiratory symptoms reported during the week preceding AMI were fever
(17.9%), cough (16.5%), and runny nose (10.6%). The prevalence of CRI
among AMI cases and subgroups varied between influenza and non-influenza
seasons, with the highest prevalence observed during the 2017 influenza
season (35.7%). During the 2018 influenza season, CRI was more common
in recurrent than new onset AMI cases (11.9% vs. 7.3%; p=0.3).
Furthermore, during the 2017 influenza season, the prevalence of CRI was
higher among STEMI cases than NSTEMI cases (36.8% vs. 33.3%; p=0.8),
and prevalence of CRI was higher in STEMI than in NSTEMI cases during
the non-influenza season (14.2% vs. 7.3%; p=0.2) and during the 2018
influenza season (7.9% vs. 6.5%;
p=0.7).
The high-troponin AMI cases had
higher rates of CRI compared to low-troponin cases during 2017 (37.5%
vs. 35.0%; p=0.9) and during 2018 influenza season (11% vs. 8.7%;
p=0.6). Lastly, the percentage of
CRI within three days of onset of AMI was higher in recurrent than new
onset AMI cases (p=0.15), in high-troponin than low-troponin AMI cases
(p=0.6) during 2018 influenza season and higher in STEMI than NSTEMI
cases (p>0.05) during both non-influenza and 2018 influenza
season.