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History & Trends

How Blood Pressure is Displayed

Learn how Sunu presents blood pressure readings with both systolic and diastolic values in one convenient view.

Because blood pressure consists of two numbers (systolic and diastolic), Sunu handles it specially to make it easy to read and understand.

Understanding Blood Pressure

The Two Numbers

Systolic (Top Number):

  • Pressure when heart beats and pumps blood
  • Higher of the two numbers
  • Typically ranges from 90-140 mmHg for adults
  • Example: In "120/80", 120 is systolic

Diastolic (Bottom Number):

  • Pressure when heart rests between beats
  • Lower of the two numbers
  • Typically ranges from 60-90 mmHg for adults
  • Example: In "120/80", 80 is diastolic

In the History List

How Readings Appear

When you see a blood pressure reading in your main health timeline, it will be displayed in the familiar "Systolic/Diastolic" format.

Example displays:

  • 120/80 mmHg (optimal)
  • 135/85 mmHg (elevated)
  • 110/70 mmHg (normal)

Intelligent Grouping

Even though Systolic and Diastolic are technically two separate data points in Apple Health, Sunu intelligently finds and groups them together based on their timestamp.

How it works:

  • Searches for matching timestamps
  • Pairs systolic and diastolic readings
  • Displays as single entry
  • Maintains data accuracy

Timestamp matching:

  • Readings taken within seconds of each other
  • Automatically paired by the app
  • No manual intervention needed
  • Works with all blood pressure devices

In the Trend Chart

Dual-Line Display

When you tap on a blood pressure reading to view its detail screen, the trend chart will show two sets of data points on the same graph.

Visual representation:

  • Upper line/points: Systolic values (usually blue or darker color)
  • Lower line/points: Diastolic values (usually red or lighter color)
  • Legend: Shows which line represents which value
  • Single chart: Both values visible simultaneously

Why This Helps

Convenience:

  • See both numbers at once
  • No need to switch between separate charts
  • Understand complete blood pressure picture

Pattern recognition:

  • Compare how both values trend together
  • Identify if one changes more than the other
  • Spot concerning patterns faster

Analysis:

  • Pulse pressure (difference) visible at a glance
  • Both values' response to interventions
  • Relationship between systolic and diastolic

Reading Blood Pressure Trends

Normal Patterns

Both trending together:

  • Systolic and diastolic rise or fall together
  • Common with weight changes
  • Response to medication adjustments
  • General fitness improvements

Systolic changes more:

  • Systolic rises while diastolic stays steady
  • Can occur with stress or age
  • May indicate arterial stiffness
  • Worth monitoring over time

Diastolic changes more:

  • Less common pattern
  • May need medical attention
  • Could indicate vascular changes
  • Consult healthcare provider

Blood Pressure Categories

The chart may color-code or indicate these ranges:

Normal:

  • Systolic: Less than 120 mmHg
  • Diastolic: Less than 80 mmHg
  • Display: Usually green indicators

Elevated:

  • Systolic: 120-129 mmHg
  • Diastolic: Less than 80 mmHg
  • Display: May show yellow indicators

Hypertension Stage 1:

  • Systolic: 130-139 mmHg
  • Diastolic: 80-89 mmHg
  • Display: May show orange indicators

Hypertension Stage 2:

  • Systolic: 140+ mmHg
  • Diastolic: 90+ mmHg
  • Display: May show red indicators

Hypertensive Crisis:

  • Systolic: Higher than 180 mmHg
  • Diastolic: Higher than 120 mmHg
  • Display: Red alert indicators
  • Seek immediate medical attention

Data Sources and Accuracy

Where Data Comes From

Apple Health:

  • Manual entries in Health app
  • Connected blood pressure monitors
  • Smart watches with BP capability
  • Other health apps that write to Health

Manual Entry in Sunu:

  • Can add readings directly
  • Both numbers entered together
  • Timestamp recorded automatically

Ensuring Accuracy

Measurement tips:

  • Sit quietly for 5 minutes before measuring
  • Rest arm at heart level
  • Don't cross legs
  • Take multiple readings
  • Average the results

Device calibration:

  • Use validated BP monitors
  • Check device accuracy regularly
  • Follow manufacturer instructions
  • Compare with clinical readings

Analyzing Your Blood Pressure

Using the AI

Ask specific questions:

  • "Is my blood pressure improving?"
  • "What's my average BP this month?"
  • "Are my readings in a healthy range?"
  • "How do stress and BP correlate?"

AI insights:

  • Trend analysis over time
  • Comparison to healthy ranges
  • Identification of patterns
  • Suggestions for improvement

Time Window Selection

Day view:

  • See multiple readings in one day
  • Identify daily patterns
  • Morning vs. evening differences

Week view:

  • Track week-to-week changes
  • See response to interventions
  • Identify specific days with high/low readings

Month view:

  • Overall trend direction
  • Success of medication changes
  • Lifestyle intervention effects

Year view:

  • Long-term control
  • Seasonal patterns
  • Big picture health assessment

Sharing Blood Pressure Data

With Healthcare Providers

What to share:

  • Trend chart showing both values
  • Average readings for period
  • Highest and lowest readings
  • Notes about circumstances (stress, medications)

How to share:

  • Export chart as PDF
  • Email or print for appointment
  • Show on phone during visit
  • Include AI analysis summary

Tracking Progress

Before and after comparisons:

  • Medication adjustments
  • Diet and exercise changes
  • Stress management interventions
  • Weight loss efforts

Common Questions

Why Are My Numbers Separate Sometimes?

Possible reasons:

  • Readings weren't taken simultaneously
  • Different devices used
  • Manual entry at different times
  • Sync issues between devices

How to fix:

  • Always measure both together
  • Use same device for both readings
  • Enter manually as pair if needed
  • Check device synchronization

What Is Pulse Pressure?

Definition: The difference between systolic and diastolic

Calculation: Systolic - Diastolic

Example: 120/80 = pulse pressure of 40

Normal range: 40-60 mmHg

What it means:

  • Wide pulse pressure (>60): May indicate arterial stiffness
  • Narrow pulse pressure (<40): Could indicate heart issues
  • Monitor trends, not just values

When Should I Be Concerned?

Contact healthcare provider if:

  • Consistently elevated readings (>130/80)
  • Sudden increases in BP
  • Symptoms like headache, chest pain, or vision changes
  • Readings consistently outside your normal range
  • One number elevated while other is normal

Tips for Better Tracking

Consistency Is Key

Measure at the same time daily:

  • Morning before medication
  • Evening before bed
  • Or both for complete picture

Same conditions:

  • Same arm
  • Same position (seated)
  • Same device
  • Same environment

Create Context

Add notes to readings:

  • How you felt
  • Stress levels
  • Medication timing
  • Physical activity before measurement

Track related factors:

  • Sleep quality
  • Stress events
  • Diet (sodium intake)
  • Exercise

🩺 Medical Note

Blood pressure can vary throughout the day and in response to many factors. Single high readings don't necessarily mean you have hypertension. Consistent patterns over time are what matter most. Always consult with your healthcare provider about your blood pressure management.

📊 Tracking Tip

Take blood pressure at the same time each day for the most accurate trend analysis. Morning readings (before medication and breakfast) are often used as the baseline. Evening readings can show how your day affected your BP.