Blood pressure: how to measure, manage, and treat high blood pressure (AMA #48 rebroadcast)

What It Covers

Peter Attia covers blood pressure comprehensively — from the physiology of systolic and diastolic readings to the SPRINT trial's findings on aggressive treatment targets. He addresses accurate home measurement protocols, the cardiovascular, renal, and cognitive consequences of hypertension, lifestyle interventions with quantified effects, and the four first-line medication classes with their specific trade-offs.

Key Questions Answered

• •Measurement Protocol: Office blood pressure readings are unreliable. Accurate home measurement requires sitting quietly for five minutes with back supported, feet flat, legs uncrossed, and arm at heart level before taking three readings five minutes apart. Crossed legs add 5–8 mmHg, talking adds 10–15 mmHg, a full bladder adds 10–15 mmHg, and skipping the rest period can inflate readings by 10–20 mmHg.
• •SPRINT Trial Targets: The 2015 SPRINT trial demonstrated that treating systolic blood pressure to below 120 mmHg versus the standard below 140 mmHg produced a 25% relative reduction in cardiovascular events and a 27% reduction in all-cause mortality over roughly three years. Current guidelines define normal as below 120/80, with Stage 1 hypertension starting at 130 systolic or 80 diastolic.
• •Organ Damage Beyond the Heart: Elevated blood pressure damages three primary organs — the heart, brain, and kidneys. Each 20 mmHg rise in systolic pressure doubles mortality risk from stroke and vascular disease. The SPRINT MIND sub-study found intensive blood pressure control reduced dementia risk by 16% with a 0.6% absolute risk reduction, and kidney filtration rate declines accelerate significantly with chronic hypertension.
• •Exercise Prescription: Aerobic exercise at 65–75% of maximum heart rate for 90–150 minutes weekly reduces systolic blood pressure by up to 8 mmHg and diastolic by 5 mmHg within four weeks. Dynamic resistance training adds roughly 2–3 mmHg further reduction. Isometric resistance exercise produces an additional 6 mmHg systolic reduction, making combined training the most effective exercise strategy for blood pressure management.
• •Weight and Sodium: Every kilogram of weight loss reduces systolic blood pressure by approximately 1 mmHg and diastolic by nearly 1 mmHg. Sodium sensitivity varies by individual — higher in older adults, African Americans, and those with metabolic syndrome. Reducing sodium below 1,500 mg daily may lower systolic by 5–6 mmHg but is associated with increased all-cause mortality per Institute of Medicine meta-analyses, making extreme restriction inadvisable.
• •Medication Selection: Four first-line drug classes each reduce systolic blood pressure by 12–15 mmHg: ACE inhibitors, ARBs, thiazide diuretics, and calcium channel blockers. ARBs are marginally preferable to ACE inhibitors across efficacy and side-effect profiles. Thiazide diuretics are avoided in gout, hyperlipidemia, or type 2 diabetes. Calcium channel blockers are contraindicated in heart failure with reduced ejection fraction. African Americans respond better to diuretics or calcium channel blockers.