- 1.1 Measuring blood pressure
- 1.2 Diagnosing hypertension
- 1.3 Assessing cardiovascular risk and target organ damage
- 1.4 Lifestyle interventions
- 1.5 Initiating and monitoring antihypertensive drug treatment, including blood pressure targets
- 1.6 Choosing antihypertensive drug treatment
- 1.7 Patient education and adherence to treatment
The following guidance is based on the best available evidence. The full guideline gives details of the methods and the evidence used to develop the guidance.
1.1.1 Healthcare professionals taking blood pressure measurements need adequate initial training and periodic review of their performance. 
1.1.2 Because automated devices may not measure blood pressure accurately if there is pulse irregularity (for example, due to atrial fibrillation), palpate the radial or brachial pulse before measuring blood pressure. If pulse irregularity is present, measure blood pressure manually using direct auscultation over the brachial artery. 
1.1.3 Healthcare providers must ensure that devices for measuring blood pressure are properly validated, maintained and regularly recalibrated according to manufacturers' instructions. 
1.1.4 When measuring blood pressure in the clinic or in the home, standardise the environment and provide a relaxed, temperate setting, with the person quiet and seated, and their arm outstretched and supported. 
1.1.5 If using an automated blood pressure monitoring device, ensure that the device is validated and an appropriate cuff size for the person's arm is used. 
1.1.6 In people with symptoms of postural hypotension (falls or postural dizziness):
measure blood pressure with the person either supine or seated
measure blood pressure again with the person standing for at least 1 minute prior to measurement. [2004, amended 2011]
1.1.7 If the systolic blood pressure falls by 20 mmHg or more when the person is standing:
measure subsequent blood pressures with the person standing
consider referral to specialist care if symptoms of postural hypotension persist. [2004, amended 2011]
1.2.1 When considering a diagnosis of hypertension, measure blood pressure in both arms.
If the difference in readings between arms is more than 20 mmHg, repeat the measurements.
If the difference in readings between arms remains more than 20 mmHg on the second measurement, measure subsequent blood pressures in the arm with the higher reading. 
1.2.2 If blood pressure measured in the clinic is 140/90 mmHg or higher:
Take a second measurement during the consultation.
If the second measurement is substantially different from the first, take a third measurement.
Record the lower of the last two measurements as the clinic blood pressure. 
1.2.3 If the clinic blood pressure is 140/90 mmHg or higher, offer ambulatory blood pressure monitoring (ABPM) to confirm the diagnosis of hypertension. 
1.2.4 If a person is unable to tolerate ABPM, home blood pressure monitoring (HBPM) is a suitable alternative to confirm the diagnosis of hypertension. 
1.2.5 If the person has severe hypertension, consider starting antihypertensive drug treatment immediately, without waiting for the results of ABPM or HBPM. 
1.2.6 While waiting for confirmation of a diagnosis of hypertension, carry out investigations for target organ damage (such as left ventricular hypertrophy, chronic kidney disease and hypertensive retinopathy) (see recommendation 1.3.3) and a formal assessment of cardiovascular risk using a cardiovascular risk assessment tool (see recommendation 1.3.2). 
1.2.7 If hypertension is not diagnosed but there is evidence of target organ damage such as left ventricular hypertrophy, albuminuria or proteinuria, consider carrying out investigations for alternative causes of the target organ damage. 
1.2.8 If hypertension is not diagnosed, measure the person's clinic blood pressure at least every 5 years subsequently, and consider measuring it more frequently if the person's clinic blood pressure is close to 140/90 mmHg. 
1.2.9 When using ABPM to confirm a diagnosis of hypertension, ensure that at least two measurements per hour are taken during the person's usual waking hours (for example, between 08:00 and 22:00). Use the average value of at least 14 measurements taken during the person's usual waking hours to confirm a diagnosis of hypertension. 
1.2.10 When using HBPM to confirm a diagnosis of hypertension, ensure that:
for each blood pressure recording, two consecutive measurements are taken, at least 1 minute apart and with the person seated and
blood pressure is recorded twice daily, ideally in the morning and evening and
blood pressure recording continues for at least 4 days, ideally for 7 days.
Discard the measurements taken on the first day and use the average value of all the remaining measurements to confirm a diagnosis of hypertension. 
1.2.11 Refer the person to specialist care the same day if they have:
accelerated hypertension, that is, blood pressure usually higher than 180/110 mmHg with signs of papilloedema and/or retinal haemorrhage or
suspected phaeochromocytoma (labile or postural hypotension, headache, palpitations, pallor and diaphoresis). [2004, amended 2011]
1.2.12 Consider the need for specialist investigations in people with signs and symptoms suggesting a secondary cause of hypertension. [2004, amended 2011]
For NICE guidance on the early identification and management of chronic kidney disease see 'Chronic kidney disease' (NICE clinical guideline 73, 2008).
1.3.1 Use a formal estimation of cardiovascular risk to discuss prognosis and healthcare options with people with hypertension, both for raised blood pressure and other modifiable risk factors. 
1.3.3 For all people with hypertension offer to:
test for the presence of protein in the urine by sending a urine sample for estimation of the albumin:creatinine ratio and test for haematuria using a reagent strip
take a blood sample to measure plasma glucose, electrolytes, creatinine, estimated glomerular filtration rate, serum total cholesterol and HDL cholesterol
examine the fundi for the presence of hypertensive retinopathy
arrange for a 12-lead electrocardiograph to be performed. [2004, amended 2011]
For NICE guidance on the prevention of obesity and cardiovascular disease see 'Obesity' (NICE clinical guideline 43, 2006) and 'Prevention of cardiovascular disease at population level' (NICE public health guidance 25, 2010).
1.4.1 Lifestyle advice should be offered initially and then periodically to people undergoing assessment or treatment for hypertension. 
1.4.2 Ascertain people's diet and exercise patterns because a healthy diet and regular exercise can reduce blood pressure. Offer appropriate guidance and written or audiovisual materials to promote lifestyle changes. 
1.4.3 Relaxation therapies can reduce blood pressure and people may wish to pursue these as part of their treatment. However, routine provision by primary care teams is not currently recommended. 
1.4.4 Ascertain people's alcohol consumption and encourage a reduced intake if they drink excessively, because this can reduce blood pressure and has broader health benefits. 
1.4.5 Discourage excessive consumption of coffee and other caffeine-rich products. 
1.4.6 Encourage people to keep their dietary sodium intake low, either by reducing or substituting sodium salt, as this can reduce blood pressure. 
1.4.7 Do not offer calcium, magnesium or potassium supplements as a method for reducing blood pressure. 
1.4.8 Offer advice and help to smokers to stop smoking. 
1.4.9 A common aspect of studies for motivating lifestyle change is the use of group working. Inform people about local initiatives by, for example, healthcare teams or patient organisations that provide support and promote healthy lifestyle change. 
1.5.1 Offer antihypertensive drug treatment to people aged under 80 years with stage 1 hypertension who have one or more of the following:
target organ damage
established cardiovascular disease
a 10-year cardiovascular risk equivalent to 20% or greater. 
1.5.2 Offer antihypertensive drug treatment to people of any age with stage 2 hypertension. 
1.5.3 For people aged under 40 years with stage 1 hypertension and no evidence of target organ damage, cardiovascular disease, renal disease or diabetes, consider seeking specialist evaluation of secondary causes of hypertension and a more detailed assessment of potential target organ damage. This is because 10-year cardiovascular risk assessments can underestimate the lifetime risk of cardiovascular events in these people. 
1.5.4 Use clinic blood pressure measurements to monitor the response to antihypertensive treatment with lifestyle modifications or drugs. 
1.5.5 Aim for a target clinic blood pressure below 140/90 mmHg in people aged under 80 years with treated hypertension. 
1.5.6 Aim for a target clinic blood pressure below 150/90 mmHg in people aged 80 years and over, with treated hypertension. 
1.5.7 For people identified as having a 'white-coat effect', consider ABPM or HBPM as an adjunct to clinic blood pressure measurements to monitor the response to antihypertensive treatment with lifestyle modification or drugs. 
1.5.8 When using ABPM or HBPM to monitor response to treatment (for example, in people identified as having a 'white coat effect' and people who choose to monitor their blood pressure at home), aim for a target average blood pressure during the person's usual waking hours of:
below 135/85 mmHg for people aged under 80 years
below 145/85 mmHg for people aged 80 years and over. 
1.6.1 Where possible, recommend treatment with drugs taken only once a day. 
1.6.2 Prescribe non-proprietary drugs where these are appropriate and minimise cost. 
1.6.3 Offer people with isolated systolic hypertension (systolic blood pressure 160 mmHg or more) the same treatment as people with both raised systolic and diastolic blood pressure. 
1.6.4 Offer people aged 80 years and over the same antihypertensive drug treatment as people aged 55–80 years, taking into account any comorbidities. 
1.6.5 Offer antihypertensive drug treatment to women of child-bearing potential in line with the recommendations on Management of pregnancy with chronic hypertension and Breastfeeding in 'Hypertension in pregnancy' (NICE clinical guideline 107). 
1.6.6 Offer people aged under 55 years step 1 antihypertensive treatment with an angiotensin-converting enzyme (ACE) inhibitor or a low-cost angiotensin-II receptor blocker (ARB). If an ACE inhibitor is prescribed and is not tolerated (for example, because of cough), offer a low-cost ARB.
1.6.7 Do not combine an ACE inhibitor with an ARB to treat hypertension. 
1.6.8 Offer step 1 antihypertensive treatment with a calcium-channel blocker (CCB) to people aged over 55 years and to black people of African or Caribbean family origin of any age. If a CCB is not suitable, for example because of oedema or intolerance, or if there is evidence of heart failure or a high risk of heart failure, offer a thiazide-like diuretic. 
1.6.9 If diuretic treatment is to be initiated or changed, offer a thiazide‑like diuretic, such as chlortalidone (12.5–25.0 mg once daily) or indapamide (1.5 mg modified-release once daily or 2.5 mg once daily) in preference to a conventional thiazide diuretic such as bendroflumethiazide or hydrochlorothiazide. 
1.6.10 For people who are already having treatment with bendroflumethiazide or hydrochlorothiazide and whose blood pressure is stable and well controlled, continue treatment with the bendroflumethiazide or hydrochlorothiazide. 
1.6.11 Beta-blockers are not a preferred initial therapy for hypertension. However, beta-blockers may be considered in younger people, particularly:
those with an intolerance or contraindication to ACE inhibitors and angiotensin II receptor antagonists or
women of child-bearing potential or
people with evidence of increased sympathetic drive. 
1.6.12 If therapy is initiated with a beta-blocker and a second drug is required, add a calcium-channel blocker rather than a thiazide-like diuretic to reduce the person's risk of developing diabetes. 
1.6.14 If a CCB is not suitable for step 2 treatment, for example because of oedema or intolerance, or if there is evidence of heart failure or a high risk of heart failure, offer a thiazide-like diuretic. 
1.6.15 For black people of African or Caribbean family origin, consider an ARB in preference to an ACE inhibitor, in combination with a CCB.
1.6.16 Before considering step 3 treatment, review medication to ensure step 2 treatment is at optimal or best tolerated doses. 
1.6.17 If treatment with three drugs is required, the combination of ACE inhibitor or angiotensin II receptor blocker, calcium-channel blocker and thiazide-like diuretic should be used. 
1.6.18 Regard clinic blood pressure that remains higher than 140/90 mmHg after treatment with the optimal or best tolerated doses of an ACE inhibitor or an ARB plus a CCB plus a diuretic as resistant hypertension, and consider adding a fourth antihypertensive drug and/or seeking expert advice.
1.6.19 For treatment of resistant hypertension at step 4:
Consider further diuretic therapy with low-dose spironolactone (25 mg once daily) if the blood potassium level is 4.5 mmol/l or lower. Use particular caution in people with a reduced estimated glomerular filtration rate because they have an increased risk of hyperkalaemia.
Consider higher-dose thiazide-like diuretic treatment if the blood potassium level is higher than 4.5 mmol/l. 
1.6.20 When using further diuretic therapy for resistant hypertension at step 4, monitor blood sodium and potassium and renal function within 1 month and repeat as required thereafter. 
1.6.21 If further diuretic therapy for resistant hypertension at step 4 is not tolerated, or is contraindicated or ineffective, consider an alpha- or beta-blocker. 
1.6.22 If blood pressure remains uncontrolled with the optimal or maximum tolerated doses of four drugs, seek expert advice if it has not yet been obtained. 
1.7.1 Provide appropriate guidance and materials about the benefits of drugs and the unwanted side effects sometimes experienced in order to help people make informed choices. 
1.7.2 People vary in their attitudes to their hypertension and their experience of treatment. It may be helpful to provide details of patient organisations that provide useful forums to share views and information. 
1.7.3 Provide an annual review of care to monitor blood pressure, provide people with support and discuss their lifestyle, symptoms and medication. 
1.7.4 Because evidence supporting interventions to increase adherence is inconclusive, only use interventions to overcome practical problems associated with non-adherence if a specific need is identified. Target the intervention to the need. Interventions might include:
suggesting that patients record their medicine-taking
encouraging patients to monitor their condition
simplifying the dosing regimen
using alternative packaging for the medicine
using a multi-compartment medicines system.
(This recommendation is taken from Medicines adherence [NICE clinical guideline 76].) 
 A list of validated blood pressure monitoring devices is available on the British Hypertension Society's website. The British Hypertension Society is an independent reviewer of published work. This does not imply any endorsement by NICE.
 Clinic blood pressure measurements must be used in the calculation of cardiovascular risk.
 A discrepancy of more than 20/10 mmHg between clinic and average daytime ABPM or average HBPM blood pressure measurements at the time of diagnosis.
 In 2007 the MHRA issued a drug safety update on ACE inhibitors and angiotensin II receptor antagonists: not for use in pregnancy that states 'Use in women who are planning pregnancy should be avoided unless absolutely necessary, in which case the potential risks and benefits should be discussed'. There is also a 2009 MHRA safety update for ACE inhibitors and angiotensin II receptor antagonists: use during breast feeding and related clarification: ACE inhibitors and angiotensin II receptor antagonists.
 Choose a low-cost ARB.
 At the time of publication (August 2011), spironolactone did not have UK marketing authorisation for this indication. Informed consent should be obtained and documented.