| INTRODUCTIONCurrent guidelines on hypertension now accept that ambulatory blood pressure (BP) measurement (ABPM) is the measurement method of choice for diagnosing hypertension. The technique has been shown to be more accurate and more cost effective than office BP (OBPM) or self-measurement of BP (SBPM). The diagnostic superiority of ABPM derives mainly from the ability of the technique to identify sustained hypertension by allowing for the exclusion of white-coat hypertension and by demonstrating the presence of masked hypertension. ABPM also offers diagnostic insights into nocturnal patterns of BP, and, despite less attention being given to nighttime BP in clinical practice, the increased risk of stroke with elevated nocturnal BP makes it important to assess the response to BP-lowering medication during sleep. Surprisingly, although current guidelines give detailed recommendations on the diagnostic potential and use of ABPM, there are scant recommendations on the benefits and application of the technique for the initiation of BP-lowering therapy in clinical practice and virtually no recommendations as to how it might be used to assess the efficacy of drug treatment and guide the prescribing physician on the most appropriate drug administration and dosage over time. Furthermore, the limited availability of ABPM to date has confined its use to the diagnosis of hypertension, rather than applying the technique to gauging more reliably the response to treatment, especially in patients at high risk, who may be taking a number of BP-lowering drugs. The increasing approval of ABPM for reimbursement in many countries is an overdue and welcome initiative, which, although incurring substantial initial short-term costs, will lead to improved BP control in the longer term and substantial savings in the prevention of the cardiovascular (CV) consequences of hypertension, most especially the prevention of stroke. However, we are now faced with a responsibility to use ABPM to achieve the maximum benefit, without applying the technique excessively.
| ABPM FOR THE DIAGNOSIS OF HYPERTENSIONThe US Preventive Services Task Force, with out-of-office measurement is sustained and not due to a whitecoat reaction, as may occur in some 25% of patients. 5 Therefore, there is no disagreement but that ABPM should be offered to all patients before prescribing BP-lowering medication.
| ABPM TO DETERMINE EFFICACY OF TREATMENTWe now move into uncharted waters as none of the guidelines make definitive recommendations regarding how to use ABPM to initiate and assess the response to antihypertensive drug treatment in spite of there being sound evidence that ABPM can be extremely helpful in this regard. The largest study to date on the use of ABPM to guide treatment in primary care comes from Spain, where a nationwide project to promote the use of ABPM in primary care settings was established a decade ago. 6 This study showed that ABPM identified the patients for whom medication was needed and resulted in an overall reduction in the number of pa...