Qualitative Holter monitor assessments
Twenty-four hour HM recordings were evaluated
qualitatively
for simple counts of abnormalities and severity, (mild, 1 point;
medium, 2 points; or severe, 3 points). Tachycardia
at rest (.100
per minute) was assessed as mild ,6 hours/24 hours;medium
.6 and 10 hours/24 hours; or severe .10 hours/24
hours). Oscillating abnormal T-wave flattenings and T-wave
inversions were evaluated as mild (occasional), medium
(intermittent), or severe (frequent) and given severity point
scores of 1, 2, or 3, respectively. Deep inverted T-waves,
multiple and multifocal ventricular premature contractions,
and bigeminal rhythms were evaluated by count and severity.
Thus, HM recordings had two numeric evaluations, ie, a
simple numeric count of types of abnormality and a severity
score. For example, a patient with an HM showing T-wave
flattening (severity score 1), mild supraventricular tachycardia
(severity score 1), but with no inverted T-waves would
equate to a severity score of 2 with an abnormality count of
2. Another patient with an HM and moderate supraventricular
tachycardia (severity score 2) “abnormal count 1”, and both
moderate numbers of oscillating T-wave flattenings (severity
score 2) “abnormal count 1”, multifocal ventricular premature
contractions (severity score 2) “abnormal count 1”, and
a bigeminal rhythm (severity
score 3) “abnormal count 1.”
The latter HM would have a total severity score of 9 and an
abnormal simple occurrence count of 4.