The prevalence masked hypertension hypertension in a large 24hr ABPM outpatient population.
David WJ Armstrong, Michael Nault, Daniel Brouillard. Murray F. Matangi,
Kingston Heart Clinic, Kingston, Canada.
Purpose. To determine the prevalence of masked hypertension in patients presenting to the Kingston Heart Clinic for a 24hr ABPM.
Methods. 24hrBPfile, the 24hr ABPM modules of CARDIOfile, our cardiology database was searched for all patients who had a 24hr ABPM. Masked hypertension was defined as an office systolic BP ≤140mmHg with an average daytime 24hr ABPM systolic BP >135mmHg. Hypertension was defined as an office systolic BP >140mmHg with an average daytime systolic BP >135mmHg. White coat hypertension as an office SBP >140mmHg and an average daytime systolic BP ≤135mmHg. Normotensive was defined as office systolic BP ≤140mmHg with an average daytime systolic BP ≤135mmHg. There were 12,880 patients who had 15,945 24hr ABPMs. Only the very first 24hr ABPM was used in this analysis.
Conclusions: Masked hypertension makes up only 2% of the total 24hr ABPM population.
However, masked hypertension makes up 11.9% of the apparently normotensive population. This
means 1 in 8 patients where the office systolic BP is normal have an abnormal systolic BP at home.
Our data in a very large population supports the wider use of 24hr ABPM for the diagnosis of