Related Experiment Videos
[Thrombolytic therapy for acute myocardial infarction: circadian sensitivity]
Insights
The effectiveness of streptokinase therapy for acute myocardial infarction depends on factors like Killip class and treatment timing. Morning administration and prompt treatment improve outcomes, highlighting potential adjustments for better patient results.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Thrombolytic therapy (TT) with streptokinase is a treatment for acute myocardial infarction (AMI).
- Identifying factors influencing TT success is crucial for optimizing patient care.
Purpose of the Study:
- To determine additional factors affecting the efficacy of streptokinase in treating acute myocardial infarction.
- To analyze patient characteristics and treatment parameters associated with successful thrombolytic therapy.
Main Methods:
- Analysis of 122 male patient case histories treated with streptokinase for AMI.
- Patients were categorized into effective, probably successful, and unsuccessful treatment groups.
- Statistical analysis, including multiple regression, was used to identify significant determinants of TT success.
Main Results:
- Killip class, time delay from symptom onset to TT, and time of day for TT initiation were significant factors influencing treatment success.
- Higher Killip class and longer delays were associated with less effective TT.
- Circadian variations in efficacy were observed, with higher effectiveness in the evening and lower effectiveness at night.
- Fibrinogen levels and left ventricular ejection fraction (LVEF) post-treatment also differed significantly between effective and unsuccessful groups.
- Smoking was not found to be an independent factor for TT success.
Conclusions:
- Killip class, time delay, and time of day are key independent determinants of streptokinase therapy success in male AMI patients.
- Findings suggest potential clinical implications, such as adjusting streptokinase dosage based on the time of day or considering primary angioplasty in the morning.
- Further research may explore optimizing TT administration based on these identified factors.
Aim:
To identify additional factors which may influence the results of thrombolytic therapy (TT) with streptokinase in acute myocardial infarction (AMI).
Materials And Methods:
122 case histories of males treated with streptokinase for AMI were analyzed. The patients were subdivided into 3 groups according to TT effectiveness: effective (74 patients-60.7%, age 61.3 +/- 11.9 years, group 1); probably successful (13 patients-10.7%, age 68.9 +/- 9.3, group 2), unsuccessful (35 patients-28.6%, age 64.9 +/- 13.6, group 3).
Results:
Between groups 1 and 3 there were no differences by age, AMI location, coronary risk factors (smoking, hypertension, diabetes mellitus, hyperlipidemia, family history of coronary disease), previous MI, Q and non-Q-wave MI prevalence. Significant differences were, on the contrary, obtained for the Killip class (1.82 +/- 0.46 vs 2.26 +/- 0.74, p = 0.0001), fibrinogen level before TT (314.6 +/- 87.2 vs 215.5 +/- 121.9 mg%, p = 0.003), LVEF% (by echo) 24 hours after the treatment (41.9 +/- 6.3 vs 36.5 +/- 7.8, p = 0.0001), time delay of TT from AMI symptoms onset (2.45 +/- 1.14 vs 3.08 +/- 1.73 hours, p = 0.014). Circadian variation has been discovered for efficacy of streptokinase: in the evening (from 16 to 24 pm) the effectiveness of TT was highest--38.0% vs 14.7% (p = 0.005) and at night (from 24 pm to 08 am) the effect was the lowest--22.5% vs 41.2% (p = 0.024). Smoking was not an independent factor for TT success.
Conclusion:
Multiple regression analysis (step by step) has shown that the main independent determinants for TT success in males were: Killip class (p = 0.002), time delay of TT (p = 0.014), day time of TT beginning (p = 0.023) and MI location (p = 0.123). These findings may have several clinical implications, for example: dose adjustment of streptokinase for the time of day or preference for primary coronary angioplasty in the morning.