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Troponin-T in patients with unstable and stable angina pectoris undergoing coronary bypass surgery
1Department of Thoracic Surgery, Karolinska Hospital, Stockholm, Sweden. staffan.bjessmo@swipnet.se
Insights
Troponin-T levels indicate myocardial damage after coronary bypass surgery. Patients with severe unstable angina (Braunwald class IIIC) experienced significant heart cell damage, unlike those with stable angina.
Area of Science:
- Cardiology
- Cardiac Surgery
- Biomarker Research
Background:
- Troponin-T is a sensitive biomarker for myocardial damage.
- Assessing Troponin-T is crucial in cardiac surgery contexts.
Purpose of the Study:
- To evaluate Troponin-T levels post-coronary bypass surgery.
- To correlate Troponin-T levels with angina stability and patient outcomes.
Main Methods:
- Troponin-T levels measured pre- and post-surgery (64 hours) in 200 patients (100 unstable, 100 stable angina).
- Patients categorized by angina class (Braunwald IIIC).
Main Results:
- Postoperative Troponin-T levels peaked within 6 hours, declining by 64 hours.
- Braunwald class IIIC unstable angina patients showed significantly elevated and persistent Troponin-T levels.
- 27% of IIIC patients experienced perioperative myocardial infarction; 67% had elevated pre-operative Troponin-T.
Conclusions:
- Coronary bypass surgery in Braunwald class IIIC unstable angina patients leads to substantial myocardial cell damage.
- Troponin-T monitoring is vital for identifying high-risk patients and assessing perioperative cardiac injury.
Background:
Troponin-T is a sensitive indicator of minor myocardial damage during coronary bypass surgery.
Methods:
Troponin-T levels were assessed before and repeatedly for 64 hours after coronary bypass surgery in 100 patients with unstable and 100 with stable angina pectoris.
Results:
Postoperative troponin-T levels rose significantly within 6 hours followed by a decline until 64 hours. In unstable patients who had pain within two days and an acute myocardial infarction within two weeks before the operation (Braunwald class IIIC), Troponin-T rose to high levels that persisted for 64 h. Sixty-seven percent of these patients had an elevated troponin-T >0.10 microg/l already before the operation and a perioperative myocardial infarction was recorded in 27%. In contrast, postoperative troponin-T levels in remaining patients classified as unstable were similar to those in patients with stable angina. Elective operations in the control group were performed with a low risk of adverse postoperative events.
Conclusions:
Patients with Braunwald class IIIC unstable angina suffered to a great extent myocardial cell damage following coronary bypass surgery.