Vital Sign Trending

Trend Apply mode lets you change a vital gradually over time, the way real physiology works — SpO2 rising as you bag the patient, HR responding to medications, BP dropping as a patient bleeds out.

Immediate Apply vs. Trend Apply

Next to the Apply New Vitals button is a toggle:

• Immediate Apply (default) — vitals change instantly on Apply
• Trend Apply — vitals animate from current value to target value over a chosen duration

The Trend Time Selector

When Trend Apply is selected, a time selector appears:

• Plus (+) button to increase time
• Minus (−) button to decrease time
• Editable text field — type a duration directly

Range: 3 to 300 seconds. Values outside this range are clamped. Non-numeric input reverts to the last valid value.

How the Math Works

Linear interpolation between current and target values. Example:

• Current HR: 60
• New HR: 100
• Trend time: 40 seconds
• Math: (100 − 60) ÷ 40 = 1 bpm per second

HR climbs 1 bpm per second for 40 seconds, settling at 100.

Multi-Vital Timing

If you stage changes to multiple vitals in one Apply, all trends start at the same moment and finish at the same moment — even though individual vitals change at different per-second rates. One shared trend timer per Apply event.

Trend Controls (Active While a Trend Is Running)

• Pause — freezes the trend timer. Vitals hold at their current mid-trend value. Press again to resume from the same point with the remaining time.
• End Trend — stops the trend immediately. Vitals stay at the current mid-trend value. They do not revert. Trend controls reset, ready for the next Apply.

Visual Indication

While a trend is running:

• Controller shows a countdown ("23s remaining"), target values (e.g. "HR: 60 → 100"), and a directional arrow on each trending vital
• Display Monitor shows the change happening in real time — subtle, not announced

What Cannot Be Trended

Discrete state changes apply immediately even in Trend mode:

• Rhythm changes (e.g. sinus to V-fib)
• Capnography waveform changes
• Pleth morphology changes
• Alarm state changes
• INOP toggles

If a rhythm change is staged alongside numeric vital changes, the rhythm flips instantly while the numbers trend.

Starting a New Apply Mid-Trend

If you click Apply while a trend is already running:

• The existing trend on affected vitals is cancelled
• A new trend starts from the current mid-trend value to the new target over the new duration
• Vitals not included in the new Apply continue their existing trend uninterrupted

Time Field Locked During Trend

The time selector is disabled while a trend is actively running. You can only change the duration before the next Apply. This prevents confusing mid-trend recalculations.

Integration with NIBP

If BP is trending when an NIBP cycle completes, the cuff captures whatever value the trend has reached at that moment — not the target value. Multiple auto-cycles during a trend will capture different points along the trend curve.