How to reliably detect ischemia in the intensive care unit and operating room
1Division of Cardiothoracic Anesthesiology, Columbia University College of Physicians & Surgeons, New York, NY, USA. jss2128@columbia.edu
Insights
Detecting perioperative myocardial ischemia aids intervention, preventing heart attacks. Early detection using methods like ECG or echocardiography is crucial for predicting adverse cardiovascular outcomes.
Area of Science:
- Cardiology
- Anesthesiology
- Critical Care Medicine
Background:
- Perioperative myocardial ischemia detection is vital for preventing myocardial infarction and adverse cardiovascular outcomes.
- Risk stratification using cardiovascular disease predictors is essential before monitoring.
- Electrocardiographic (ECG) monitoring is a noninvasive, inexpensive tool for ischemia detection, though not universally applicable or perfectly sensitive/specific.
Purpose of the Study:
- To review methods for detecting perioperative myocardial ischemia.
- To compare the efficacy and limitations of different monitoring techniques.
Main Methods:
- Review of existing literature on perioperative myocardial ischemia detection.
- Comparison of Electrocardiography (ECG), hemodynamic monitoring (central venous and pulmonary artery pressures), and Transesophageal Echocardiography (TEE).
Main Results:
- ECG monitoring is inexpensive and noninvasive but has limitations in sensitivity and specificity.
- Hemodynamic monitoring via central venous and pulmonary artery pressures is insensitive for ischemia detection.
- Transesophageal echocardiography (TEE) detects ischemia earlier and more frequently than ECG through regional wall motion analysis, but requires specialized expertise.
Conclusions:
- Various methods exist for perioperative myocardial ischemia detection, each with unique advantages and disadvantages.
- ECG and TEE are primary methods, with TEE offering earlier detection but requiring higher skill levels.
- Informed selection of monitoring techniques based on patient risk and available resources is critical for optimal perioperative cardiac care.
Abstract:
Detection of myocardial ischemia in the perioperative period is important because it allows for intervention that may prevent progression of ischemia to myocardial infarction. Perioperative ischemia is also an important predictor of adverse cardiovascular outcomes. Patients should first be stratified according to their risk of having cardiovascular disease by identifying major, intermediate, and minor predictors of adverse cardiovascular outcome. Electrocardiographic (ECG) monitoring for ischemia is inexpensive and noninvasive, but may not be applicable to all patients and is not perfectly sensitive or specific. Modern operating room monitors can automate ST segment monitoring and be set to alarm if changes occur. Increases in central venous pressure and pulmonary artery pressure can be caused by myocardial ischemia, but have been shown to be very insensitive compared to ECG. Also, detection of these hemodynamic changes requires insertion of invasive monitoring devices. Transesophageal echocardiography can be used to detect myocardial ischemia by identifying changes in regional wall motion. These transesophageal echocardiography changes occur sooner and more frequently than ECG changes, but require greater knowledge and skill to properly interpret.
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