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Posts Tagged ‘tissue plasminogen activator’

  • Diabetes mellitus is a pro-coagulant state,especially so in severe uncontrolled states.(1)
  • This is mediated by increased  levels of   plasminogen  activator Inhibitor.(PAI 1 and 2
  • This tilts  anti-fibrinolytic  forces towards thrombosis.
  • High PAI-1 is an Independent risk factor for MI in young individuals (3)
  • During STEMI the success rate of  fibrinolysis is significantly lower in diabetic population because high levels of PAI 1 .
  • The triad of DM,Obesity, Insulin resistance is a powerful predictor of  poor  response to thrombolysis.

 

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Differential response of thrombolysis between left and right coronary system

  • Thrombolysis is the specific treatment for acute myocardial infarction. ( Privileged few , get primary PCI))
  • Failed thrombolysis occurs in significant number of patients ( 30-40%).
  • Persistent ST elevation  120 minutes after thrombolysis is best indicator of failed thrombolysis.
  • It has been a consistent observation  failed  thromolysis  is more frequent in anterior   or LAD myocardial infarction.

In a simple study we have documented  patients  with inferior MI  rarely had persistent ST elevation and thrombolysis  was   successful in vast majority  of  patients  ( Except in few patients associated lateral MI)

 

The mechanism of better thrombolysis in right coronary artery  is simple.The success of thrombolysis , apart from early time window , is directly correlated with pressure head  and the duration of contact between the thrombolytic agent and the thrombus. In right coronary circulation the  blood flow is continuous ,  occurs  both in systole and diastole that facilitates the maximum delivery of the thrombolytic agent . Further there is a favorable  pressure gradient  across RV myocardium  as the transmural occluding pressure across RV is considerably less then LV myocardium.

This paper was presented in the  “Annual cardiological society of India scientific sessions”

at Chennai, Tamil Nadu.India December 2000

Click to down load PPT full presentation

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