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document
Lateral MI Explains the Presence of Prominent R Wave ( R ≥ S ) in V1 . AIMS It is necessary to clarify if the presence of a prominent R wave in V1 , in post-myocardial infarction ( MI ) patients , is due to the involvement of the posterior wall ( currently inferobasal segment ) or the lateral wall ( as has been demonstrated recently by electrocardiographic contrast-enhanced cardiac magnetic resonance [ ECG-CE-CMR ] correlations studies ) . METHODS In 155 patients with inferolateral zone MI , as detected by CE-CMR , the following ECG parameters were evaluated and correlated with MI location according to CE-CMR : R/S ratio in V1 ≥ 1 ( classic criteria for posterior MI ) , R/S ratio in V1 ≥ 0.5 , and R in V1 ≥ 3 mm . RESULTS R/S ≥ 1 criterion : Present in 20 cases : 3 of lateral MI , 17 of inferolateral MI , 0 of inferior MI . Absent in 135 cases , 81 of lateral/inferolateral MI ( 28/53 ) , 54 of inferior MI ( SE 19.8 % , SP 100 % ) . R/S ≥ 0.5 criterion : Present in 47 cases : 6 of lateral MI , 39 of inferolateral MI , 2 of inferior MI . Absent in 108 cases , 56 of lateral/inferolateral MI ( 25/31 ) , 52 of inferior MI ( SE 44.6 % , SP 96.4 % ) . R ≥ 3 mm criterion : Present in 30 cases : 5 of IM lateral , 23 of inferolateral MI , 2 of inferior MI . Absent in 125 cases , 73 lateral/inferolateral MI ( 26/47 ) , 52 inferior MI ( SE 27.7 % , SP 96.4 % ) . CONCLUSIONS The presence of prominent the R wave in V1 is due to the lateral MI and not to the involvement of inferobasal segment of inferior wall ( old posterior wall ) .
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Intervention_Physical
Lateral MI
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Outcome_Physical
Prominent R Wave
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Outcome_Physical
following ECG parameters
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Outcome_Physical
to CE-CMR :
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Outcome_Physical
inferobasal segment
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Participant_Condition
in post-myocardial infarction ( MI ) patients
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Participant_Sample-size
155 patients
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Participant_Condition
inferolateral zone MI