Fig. 1
From: S1-induced vasospastic angina—diagnostic utility of Holter ECG: a report of a case
Electrocardiograms (ECGs) recorded on bedside. The patient complained of angina after sleep (10 PM) and midnight (1 AM) on day 2 as well as day 1 of S1 chemotherapy. Bedside ECGs were incapable of capturing abnormal findings although they were conducted immediately after the attacks. a After sleep. b Midnight