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P waves in acute myocardial infarction

N Kanemoto, T Akizuki, S Ogawa

    Japanese Heart Journal
    |March 1, 1976
    PubMed
    Summary

    P wave abnormalities in lead V1, specifically the magnitude of the P wave terminal force in V1 (PTF-V1), correlate with clinical findings and prognosis in acute myocardial infarction (AMI) patients. PTF-V1 effectively predicts pulmonary capillary wedge pressure and patient outcomes.

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    Area of Science:

    • Cardiology
    • Electrocardiography
    • Critical Care Medicine

    Background:

    • Acute myocardial infarction (AMI) management requires accurate assessment of hemodynamic status and prognosis.
    • P wave abnormalities on electrocardiogram (ECG) may offer insights into cardiac function and patient outcomes.
    • Lead V1 P wave characteristics, particularly the terminal force, have not been fully explored in relation to hemodynamic parameters and prognosis in AMI.

    Purpose of the Study:

    • To investigate the relationship between P wave abnormalities in leads II and V1 and clinical/hemodynamic findings in patients experiencing AMI.
    • To evaluate the prognostic value of P wave terminal force in lead V1 (PTF-V1) in AMI patients.

    Main Methods:

    • Analysis of 27 AMI cases, correlating ECG findings (P wave in leads II and V1) with clinical data, hemodynamic measurements (pulmonary capillary wedge pressure - PCW), and prognostic indices.
    • Specific focus on the magnitude of the P wave terminal force in lead V1 (PTF-V1) and its correlation with PCW and Peel's prognostic index.

    Main Results:

    • Significant correlation found between PTF-V1 magnitude and PCW (r=-0.75, p<0.01), with PTF-V1 accurately identifying normal PCW in 74% of cases.
    • Abnormal PTF-V1 (< -0.03 mm-sec) combined with an elevated Peel's prognostic index (>12) was associated with a 70% mortality rate during hospitalization.
    • Patients with left ventricular failure, bundle branch blocks, frequent premature beats, or a history of old myocardial infarction exhibited larger negative PTF-V1 deflections.

    Conclusions:

    • The magnitude of PTF-V1 is a valuable indicator reflecting PCW levels in AMI patients.
    • PTF-V1 serves as a useful parameter for guiding therapy and evaluating prognosis in acute myocardial infarction.

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