Table 2 Concepts Assessed by Measurement Tools

Heart discomfort

X

Heart discomfort/palpitation

X

X

Heart discomfort (unusual awareness of heartbeat, heart skipping, heart racing, tightness)

X

X

X

Heart discomfort/cardiac symptoms

X

Cardiac symptoms (palpitations, racing heartbeat, irregular beats, tightness in chest)

X

X

X

Palpitations/heart palpitations

X

Palpitation of heart, excitable/anxiety

X

Palpitations and butterflies

X

X

Breathlessness and palpitations

X

Palpitations (heart beating quickly or strongly)

X

X

X

Irregular heart beats

X

Tachycardia

X

Rapid heartbeat

X

Heart pounding (or racing)

X

X

Heart beating quickly and heart discomfort

X

X