RESULTS part 2

Hemodynamics

Change in PW Precordial Leads Vt through V4: A fair to poor correlation between R- and S-wave changes and changes in PW did not reach significance (r = .333, p= .055; r= .316, p= .069, respectively). However, an increase in R wave of more than 5 mm identified patients (n = 8) with rises in PW of 20.1 ± 7.9 mm Hg as compared with 13.3 ±7.6 mm Hg in the rest (p= .033). There was a significant fair correlation between ST elevations and changes in PW (Fig 4). Patients (n = 10) with total ST elevations of more than 15 mm had rises in PW of 21.0 ± 5.7 mm Hg compared with 11.9 ±7.5 mm Hg in the rest (p= .002).

Maximum: There was a fairly significant correlation between changes in R wave and changes in PW (r=.379, p=.027). The correlation between changes in S wave and PW was not significant (r= .3, p = .085). Still, a decrease in S wave of 9 mm or greater identified patients (n = 7) with changes in PW of 21.7 ±6.0 mm Hg as compared with 12.3 ±7.7 mm Hg in the rest (p = .0i9). A fair correlation persisted between ST elevation and PW change (r= .455, p = .007). Peak ST elevations of more than 5 mm identified patients (n=12) with rises in PW of 18.9±7.3 mm Hg as compared with 12.3 ±7.7 mm Hgin the rest (p=.019).
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FIGURE 4. The correlation between ST segment elevations and changes in PW Changes are in millimeters.

Lead V5: Little to no correlation was seen between changes in R and S wave and changes in PW (r = .068, p= .701; r= .189, p= .284). Patients (n = 5) with a loss of S wave of 3 or greater had changes in PW of 21.4  ±4.6 mm Hg compared with 13.7±8.1 mm Hg (p= .049) in the rest. There was no significant corre­lation between changes in ST segment and PW (r= .246, p= .162). However, patients (n = 8) with ST elevations of more than 1 mm had a rise of PW of 20.5  ±8.1 mm Hg compared with 13.2 ±7.4 mm Hg in the rest (p=.022).

Batients with no ECG Evidence of Anterior Injury

A subgroup of patients (n = 22) with no ECG abnor­malities suggestive of anterior wall injury, ie, ischemia or infarction, were evaluated separately. Patients in this group tended to have closer R-wave but poorer S- wave correlations with ST deviations. The correlations with change in PW were in the same range as in the total population, but because of the fewer patients involved, the p values were higher.