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Posts Tagged ‘stemi nstemi’

When a culprit thrombus keep the  myocardium as hostage . . . don’t storm the coronary artery  indiscriminately   !

When a single gun men  keeps 100 innocent people as hostages , threatening their  lives, rescue mission should start .No can can afford to wait. But, without knowing  the  culprit’s true nature the process of rescue mission is always going to be tricky .There are so many instances Newton’s third law  was reversed , when reactions  evoke more chaos  than the index action.

In the recent world terrorist events ,  the  rescue missions  were so delicate and  it was very  unfortunate we  lost  many   innocent hostages !  The reasoning is ,there  is no way we can avoid these. I wonder is it really true ? !

rescue missionNot all culprit lesions  are true ones.They simply threaten  our myocardium with  thrombus and plaques  in various forms .Don’t show aggression to pseudo threats  you may  ultimately end up with more damage.(What I call as crazy culprits!)

(  Read here , why unstable angina even though thrombus is sitting right inside the coronary artery attempting to lyse it causes more  damage !)

After thought

Iam sure ,bulk of  the Interventionists wouldn’t agree with this thought . They would decry , watching a person  silently when the myocardium  is on  fire is a serious crime !

But . . . we  need to  remember the process of extinguishing  the fire  with some more fire arms is a delicate game played in undefined  philosophical turf.

The only way to introspect  such events in life is , to accept any eventuality    arising out of “not pursuing”  a  presumed rescue mission with vigor. No need to be guilty about that,after all , it can be a myth !

Modern human cognition , growing with a staple  scientific  feed  on a 24/7  basis  is  unlikely to realise , restraint can be an effective tool  even in critical moments !

Oh,is all that I have  scribbled so far  is just a repetition  of 1000 year concept of  “Primum non nocere”

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We know  acute coronary syndrome  presents* with  either  STEMI or NSTEMI. (*It actually doesn’t present , it is our understanding and interpretation ).  Bifurcating  ACS into two is more by convention and convenience .Does  the intra-coronary  plaque  dynamics  really  permit us to divide ACS in to two distinct ECG  entities ?

Are we oversimplifying it ?  Probably yes.

The following paper was presented in the cardiological society annual scientific session in New Delhi few years ago (2006)

It generated an intense debate  , finally the chair person  reluctantly concluded such events are  possible. . .

but need more proof   . What is your take on this issue ?

DUAL   ACUTE   CORONARY SYNDROME

S.Venkatesan ,G.Gnanavelu,V.Jaganathan,

Department of cardiology . Madras Medical College. Chennai

Acute coronary syndrome (ACS)  is  classified into  STEMI  and NSTEMI and has gained universal acceptance. The classification was done by   clinical & electro physiological   findings    with   some   pathological basis. The   classification   came into vogue primarily to simplify the decision making process of thrombolysis. ( STEMI –Thrombolysis eligible .NSTEMI  Thrombolysis ineligible.) The limitation of this classification is well   exposed   as   we   now know,    STEMI can evolve into NSTEMI and NSTEMI can evolve into STEMI .   Identifying the culprit artery in ACS is   not straight forward especially in NSTEMI. Adding further complexity   is   the newer   observations that diffuse vessel inflammation,  and  multiple active plaques(MAP) are responsible for many of the episodes of  ACS.

In this scenario   there   could be two are more pathological processes   one   resulting   in  a total occlusion   and other sub total occlusion resulting in both patterns of ACS simultaneously .(STEMI & NSTEMI  Dual ACS)

We   describe two  patients  who had   presented to our CCU  . Both had STEMI one in  lateral  other in anterior wall . They   were thrombolysed   as per  criteria. Both patients had gross ST depression (>4mm)  elsewhere. In one patient it  corresponded  to the reciprocal  leads .The outcome of  thrombolysis  was turbulent .Both patients worsened and one developed  recurrent VT . Paradoxically the ST elevation   regressed   indicating a successful   thrombolysis  in the STEMI  territory  even as the ST depression  was worsening in the other leads. Angiogram   revealed   multivessel CAD with   recannalised  LAD  lesion with eccentric , thrombus containing  lesion in RCA/LCX. One patient expired and other was referred for revascularisation.

We   believe   both of our   patients  experienced  Dual ACS.

When to suspect dual ACS ?

Dual ACS is likely , when  STEMI is associated with ST depression  in at least 5mm in any two leads  or   when there is disproportionate  reciprocal ST depression ( > 2mm of primary). The reason for the poor outcome could be due to a therapeutic conflict between   STEMI & NSTEMI as the former  is  thrombolysis friendly while the later is not . Role of   thrombolysis in  such situations were ACS wanders between STEMI & NSTEMI is not defined. Another possibility is the concept of reciprocal ST elevation,   where in the index event  could be NSTEMI and STEMI is a secondary response  and  thrombolysis is apparently  contraindicated.

We conclude that in patients with ACS,   two or more   plaques can simultaneously get  activated  and  present  as a combination  of STEMI / NSTEMI   in the same  patient  in two different coronary arteries.(Dual ACS) .We suggest   that in every  patient who present with  STEMI  a possibility of   dual ACS  is to specifically considered,  as  thrombolysis could be disastrous  and  instead  they  should  reach   the  cath  lab directly.  .

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