Praecordial Electrocardiograms: a Comparison of Cf and V Lead Connections.

In the Michael Reese Heart Station, leads CF2, CF4, and CF5 are used to record the precordial electrocardiogram. This has been found to be satisfactory for ordinary clinical use (Katz, 1946). Other chest positions have been used and the chest electrode has been combined with different distant electrodes by others. Wilson and his school (Wilson et al., 1944) have been recommending a special electrode to be combined with the chest electrode; this is the central terminal which connects the three limb electrodes (each through 5000 ohms resistance): the leads so obtained are called V leads. The theoretical advantages of these leads have been questioned (Katz, 1946, and Wolforth and Livesey, 1944). Precordial electrocardiograms recorded by V leads and by CF leads obtained from chest positions 2, 4, CF V CF V