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[Intracoronary thrombolysis for high risk patients with acute myocardial infarction]
Insights
Percutaneous transluminal coronary recanalization (PTCR) significantly reduces mechanical failure in acute myocardial infarction (AMI) patients with good collaterals or recanalization. Advanced therapies further mitigate risks, though left main trunk occlusion remains a concern.
Area of Science:
- Cardiology
- Interventional Cardiology
- Acute Myocardial Infarction Management
Context:
- Acute myocardial infarction (AMI) poses significant mortality risks.
- Early reperfusion strategies like percutaneous transluminal coronary recanalization (PTCR) are crucial.
- Mechanical complications can arise despite successful recanalization.
Purpose:
- To evaluate the efficacy of PTCR in reducing mechanical failure in AMI patients.
- To assess mortality and causes of death in patients undergoing PTCR.
- To identify factors influencing outcomes and the impact of adjunctive therapies.
Summary:
- PTCR was performed in 54 AMI patients within six hours of symptom onset.
- Mechanical failure occurred in 5 of 6 patients without good collaterals or recanalization (p < 0.001).
- In 94 assessed patients, cardiac deaths (9.6%) included mechanical failure (4) and cardiogenic shock (5).
- Early PTCR had higher mortality (11.3%) mainly due to mechanical failure.
- Recent PTCR outcomes improved (7.3%), with pump failure from left main trunk occlusion being the primary cause.
- Adjunctive therapies like intra-aortic balloon pumping and beta-blockers reduced mechanical failure and cardiogenic shock mortality.
Impact:
- PTCR, especially with adjunctive therapies, significantly reduces mortality from mechanical complications in AMI.
- Left main trunk occlusion remains a critical determinant of mortality in AMI patients undergoing PTCR.
- Improved patient selection and therapeutic strategies enhance PTCR outcomes.
Abstract:
Fifty-four patients with acute myocardial infarction (AMI) were treated by percutaneous transluminal coronary recanalization (PTCR) within six hours after onset of symptoms or at the time of emergency coronary angiography. Of these, six patients had neither good collaterals nor recanalization, and followed by mechanical failure due to rupture of the left ventricular free wall or interventricular septum in five patients despite antihypertensive therapy. In the remaining 48 patients with good collaterals or recanalization, mechanical failure was statistically infrequent and occurred in only two patients (p less than 0.001). Ninety-four patients treated by PTCR were assessed in terms of mortality, cause of death and their hemodynamic findings. Cardiac deaths occurred in nine patients (9.6%); mechanical failure, in four; and cardiogenic shock due to the occlusion of the left main trunk, in five. Cardiac death was more frequently encountered in the era of the initial stage of PTCR (six of 53 cases: 11.3%) and the main cause was mechanical failure (four of six cases). On the other hand, cardiac death in recent years of PTCR was less (three of 41 cases: 7.3%), and all three had pump failure due to the occlusion of the left main trunk. Risk of mechanical failure was successfully resolved using intra-aortic balloon pumping and beta-blocker in addition to antihypertensive therapy. At the present time, PTCR and other supplementary therapy mentioned above reduced the mortality from mechanical failure and cardiogenic shock, but occlusion of the left main trunk remains an important cause of death in patients with AMI.