Coronary artery vasospasm is an important cause of chest pain syndromes that can 
lead to myocardial infarction, ventricular arrhythmias, and sudden death. In 
1959, Prinzmetal et al described a syndrome of nonexertional chest pain with 
ST-segment elevation on electrocardiography. Persistent angina is challenging, 
and repeated coronary angioplasty may be required in this syndrome. Calcium 
antagonists are extremely effective in treating and preventing coronary spasm, 
and may provide long-lasting relief for the patient. Whereas the Wellens' 
syndrome is characterized by symmetrically inverted T-waves with preserved R 
waves in the precordial leads suggestive of impending myocardial infarction due 
to a critical proximal left anterior descending stenosis, the pseudo-Wellens' 
syndrome caused by coronary artery spasm has also rarely been reported in 
literature. We present a pseudo-Wellens syndrome as a cause of vasospastic 
angina, and a diffuse ST segment elavation on electrocardiogram resembling the 
Greek letter lambda, called also 'action potential-like' ECG in a patient with 
vasospastic-type Printzmetal angina.