(Circulation. 1997;96:2987-2991.)
© 1997 American Heart Association, Inc.
Articles |
Prospective Prognostic Assessment of Blood Pressure Response During Exercise in Patients With Hypertrophic Cardiomyopathy
From the Department of Cardiological Sciences, St George's Hospital Medical School, London, UK.
Correspondence to W.J. McKenna, MD, Department of Cardiological Sciences, St George's Hospital Medical School, Cranmer Terrace, London SW17 0RE, UK.
Background Previous studies revealed that an abnormal blood pressure response (ABPR) during exercise was common in young hypertrophic cardiomyopathy (HCM) patients and was associated with a family history of premature sudden cardiac death (SCD). This study was performed prospectively to assess the prognostic significance of blood pressure response during exercise in young patients with HCM.
Methods and Results Maximum symptom-limited treadmill exercise testing with continuous blood pressure monitoring was performed in 161 consecutive patients 8 to 40 years old (27±9). A normal blood pressure response, defined as an increase in the systolic pressure of at least 20 mm Hg from rest to peak exercise in the absence of a fall of >20 mm Hg from peak pressure, was seen in 101 (63%). In 60 (37%), the blood pressure response was abnormal. There was no significant difference in patients with normal blood pressure response and ABPR in terms of age, sex, follow-up, or recognized risk factors for SCD. During the follow-up period (mean, 44±20 months), SCD occurred in 12 patients: 3 (3%) in the normal blood pressure response group versus 9 (15%) in the ABPR group (P<.009). ABPR had a sensitivity of 75%, a specificity of 66%, a negative predictive value of 97%, and a positive predictive value of 15% for the prediction of SCD. There was no significant difference in the incidence of other recognized risk factors between patients with SCD and the survivors.
Conclusions A normal exercise blood pressure response identifies low-risk young patients with HCM. An ABPR identifies the high-risk cohort; the low positive predictive accuracy, however, indicates that further risk stratification is warranted.
Key Words: hypertrophy • cardiomyopathy • risk factors • death, sudden • exercise
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