Blood pressure basics, explained plainly
What systolic and diastolic actually measure, how to read a BP chart, how to get an accurate reading at home, and more — the fundamentals behind every number CardiLog logs.
Guide
Blood Pressure Chart: Normal, Elevated, High & Crisis Ranges
Every blood pressure reading falls into one of five general ranges, from Normal to Hypertensive Crisis. Here's what each range means under the AHA guideline, and why the same numbers can be staged differently depending on which guideline your doctor uses.
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Normal Blood Pressure by Age: What the Numbers Look Like Over Time
Blood pressure guidelines don't set a different "normal" for every age group — but population averages do shift as arteries naturally stiffen over time, and systolic pressure in particular tends to climb faster than diastolic after middle age.
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Understanding Your Blood Pressure Reading: Systolic, Diastolic & Pulse
A blood pressure monitor shows three numbers — systolic, diastolic, and pulse — usually written as "120/80, pulse 72." Here's what each one actually measures and why all three matter together, not just the top number.
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What Is Systolic Blood Pressure?
Systolic blood pressure — the top number in a reading — measures the force in your arteries at the exact moment your heart contracts and pushes blood out. It's the number most guidelines lean on most heavily when tracking cardiovascular risk over time.
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What Is Diastolic Blood Pressure?
Diastolic blood pressure — the bottom number in a reading — measures the pressure in your arteries between heartbeats, while your heart relaxes and refills with blood. It's a key part of your stage classification, not just a supporting figure.
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What Is Pulse Pressure and Why It Matters
Pulse pressure is the gap between your systolic and diastolic numbers — systolic minus diastolic. For a 120/80 reading, that's a pulse pressure of 40. It's a number most people never look at, but it can add useful context to a single reading.
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What Is Mean Arterial Pressure (MAP)?
Mean Arterial Pressure (MAP) is the average pressure in your arteries across a full heartbeat cycle — weighted toward diastolic, since your heart spends more time resting between beats than contracting. Clinicians often use it as a single number for how well your organs are being perfused.
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How to Take an Accurate Blood Pressure Measurement at Home
A single mistake — talking mid-reading, a cuff over your sleeve, a full bladder — can shift a reading by 10 mmHg or more. Here's the routine that home blood pressure guidelines generally recommend for getting a number you can actually trust.
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Free Blood Pressure Log: Printable PDF vs. a Digital Log
A paper blood pressure log is better than no log at all — but it's also easy to lose, easy to forget, and hard to turn into a trend your doctor can actually use. Here's what a good log needs, whether you keep it on paper or in an app.
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Best Time to Take Blood Pressure Medication: Morning or Night?
Researchers have studied morning-versus-evening dosing for years, with mixed and sometimes contradictory results across different trials. The honest short answer: consistency matters more than the specific hour, and any timing change should go through your prescribing doctor first.
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