Clinical deterioration in patients with ST-elevation myocardial infarction during and for 24 h after percutaneous coronary intervention: an observational study

Background: In-hospital adverse events such as cardiac arrest are preceded by abnormalities in physiological data and are associated with high mortality. Healthcare institutions have implemented rapid response systems such as the medical emergency team for early recognition and response to clinical deterioration. Yet, most cardiac catheterisation laboratories, have yet to formally implement a rapid response system, so the nature and frequency of clinical deterioration is unclear and no published data exist. Objectives: To explore the nature and frequency of clinical deterioration in ST- elevation myocardial infarction patients in a cardiac catheterisation laboratory without a Medical emergency team, and 24 hours after percutaneous coronary intervention and the immediate nursing responses to clinical deterioration. Method: An exploratory descriptive study using retrospective medical audit was conducted in a public tertiary teaching hospital in Melbourne, Australia. In 2014, there were 327 ST- elevation myocardial infarction presentations of which 75 were randomly selected. Descriptive statistics were used to analyse the data. Results: In the cardiac catheterisation laboratory, 82.6% of patients fulfilled medical emergency team activation criteria and deterioration was predominantly cardiovascular. Respiratory rate was not documented for all patients in cardiac catheterisation laboratory. Post percutaneous coronary intervention, 31% of patients fulfilled medical emergency team activation criteria and this deterioration occurred secondary to hypoxia. There were no documented abnormalities in respiratory rate. Conclusion: The ST- elevation myocardial infarction patients admitted to the cardiac catheterisation laboratory are critically ill patients. Failure to monitor for signs of respiratory dysfunction such as respiratory rate in cardiac catheterisation laboratory may delay recognition of clinical deterioration and timely escalation of care. Further research is required to inform changes in the system to improve patient safety.