Detection of spontaneous episodes in post-infarction angina. Comparison between CCU and Holter monitoring
Insights
Coronary Care Unit (CCU) monitoring underestimates ischemic episodes and arrhythmias post-myocardial infarction (MI). Holter monitoring provides a more precise evaluation of these phenomena in patients with Q-wave MI or non-Q-wave MI.
Area of Science:
- Cardiology
- Clinical Medicine
- Diagnostic Monitoring
Background:
- Early post-infarction angina is a significant complication following myocardial infarction (MI).
- Distinguishing between transmural (Q-wave MI) and sub-endocardial (no Q-wave MI) infarction is crucial for patient management.
- Continuous cardiac monitoring is essential for detecting ischemic events and arrhythmias.
Purpose of the Study:
- To evaluate the incidence of early post-infarction angina in patients with Q-wave MI and no Q-wave MI.
- To compare the diagnostic accuracy of Coronary Care Unit (CCU) monitoring versus Holter monitoring for detecting ischemic episodes and arrhythmias.
- To assess the underestimation of cardiac events by CCU monitoring.
Main Methods:
- A study involving 107 patients (55 with Q-wave MI, 52 with no Q-wave MI) hospitalized for acute MI.
- Data collection through CCU monitoring and 24-hour Holter ECG recordings.
- Comparative analysis of ischemic episodes and ventricular arrhythmias detected by both monitoring methods.
Main Results:
- CCU monitoring significantly underestimates ischemic episodes (4.5 vs 13.7 before MI, 2 vs 6.8 after MI) compared to Holter monitoring.
- The incidence of angina post-MI varied between Q-wave MI and no Q-wave MI groups.
- Ventricular arrhythmias also appeared less frequent with CCU monitoring than with Holter monitoring.
Conclusions:
- Holter monitoring is crucial for accurate assessment of ischemic and arrhythmic phenomena in post-MI patients, even when admitted to a CCU.
- CCU monitoring alone may lead to underdiagnosis of cardiac events.
- Comprehensive monitoring strategies are necessary for optimal patient care after myocardial infarction.
Abstract:
The objects of this study are: to evaluate the incidence of early post-infarction angina in patients who developed transmural infarction (Q-AMI) or sub-endocardial infarction (no Q-AMI) during hospitalization; to compare data obtained from patients monitored in Coronary Care Unit (CCU) with those obtained from Holter monitoring. The 107 patients under study (55 with Q-AMI and 52 with no Q-AMI) presented the acute event on average 7.4 and 5.1 days after admittance in the CCU, respectively. A history of angina was present in all except 1 patient with Q-AMI and in all with no Q-AMI. After AMI the angina disappeared in 22 of the patients with Q-AMI and in 31 with no Q-AMI, while it continued in 33 and 21 of these patients, respectively. Twenty-one patients underwent ECG recording according to the Holter technique while in CCU, for an average of 4.4 days before and 5.2 days after the onset of AMI. The comparative analysis of the results obtained from the CCU and from Holter monitoring shows that the CCU greatly underestimates the number of ischaemic episodes, even when pain is present (4.5 episodes per patient per day before AMI and 2 after, versus 13.7 and 6.8 with Holter monitoring). The number of ventricular arrhythmias also seemed lower when analysing data from CCU monitoring. These data demonstrate the importance of Holter monitoring, even in patients admitted to a CCU, for a precise evaluation of the ischaemic and arrhythmic phenomena.
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