Default QRS Width for Cardiac Rhythms

[tanjera]

Since implementing adjustable QRS and QTc times, some rhythms have unrealistic default times. Needs hard-coded default range (add to existing sets of defaults) specifically for QRS and/or QTc.

Most notable for reproducing: from default settings, select SVT... waveform presents w/ extremely narrow QRS, extended QTc, and has an unrealistic elongated isoelectric ST segment. Noted this issue only began after implementation of adjustable QRS/QTc and can be fixed by elongating the QRS (which auto-calculates a shorter QTc; can be achieved using the reverse process too).

Suggested fix:

• [x] Add default QRS & QTc (normal) along with default normal vital sign ranges
• [ ] Only apply default QRS/QTc if "use default ranges" is selected!
• [x] For SVT and other extreme rates, would be useful to have a narrower default heart rate for more predictable QRS-QTc calculations
• [x] Ensure default QRS width is implemented from rhythm selection through to Tracing drawing

[tanjera]

Redacting "Only apply default QRS/QTc if "use default ranges" is selected!" ... I don't think this is a good idea. It will cause unwanted behavior. People may not want vital signs to change, but may expect cardiac morphology to follow cardiac rhythm changes.

[tanjera]

"Ensure default QRS width is implemented from rhythm selection through to Tracing drawing" involves redrawing some rhythms geometrically (specifically plotted ECG rhythms. Making a new issue for this

[tanjera]

Implemented in 66511cb