Transient left atrial dysfunction is a feature of Takotsubo syndrome

Table 2 Left atrial size and function

Variable	TTS (n = 124)	Anterior STEMI (n = 125)	p
LA area 2-chamber view (cm²)
Ventricular end-systole	21 (18–24)	22 (19–25)	0.03
Ventricular end-diastole	14 (12–19)	14 (12–18)	0.78
LA area 4-chamber view (cm²)
Ventricular end-systole	23 (20–28)	23 (20–27)	0.90
Ventricular end-diastole	16 (12–20)	15 (12–19)	0.26
LA volume biplane (ml)
Ventricular end-systole	72 (55–93)	74 (61–93)	0.36
Immediately before atrial contraction^a	56 (39–70)	55 (46–68)	0.71
Ventricular end-diastole	38 (25–58)	38 (30–49)	0.67
LA function (%)
Total EF (global function; reservoir)	44 (34–53)	51 (42–56)	<0.01
Passive EF (conduit)^a	21 (14–30)	24 (20–29)	0.03
Active EF (booster pump)^a	29 (20–38)	35 (28–42)	<0.01

Values are median (IQR)
EF emptying fraction, LA left atrial, TTS Takotsubo syndrome, STEMI ST-segment elevation myocardial infarction
^aPatients with atrial fibrillation during CMR imaging (n = 8 in the TTS group and n = 10 in the STEMI group) were excluded from this analysis
P-values in bold type indicate a significant difference between groups