1. Electrocardiographic and Echocardiographic Changes Associated With Malignant Catatonia 
BRADLEY F. BOEVE, M.D., TERESA A. RUMMANS, M.D., KEMUEL L. PHILBRICK, M.D., MARK J. CALLAHAN, M.D. 
Mayo Clinic Proceedings 
Volume 69, Issue 7, Pages (July 1994)
DOI: /S (12)61341-X
Copyright © 1994 Mayo Foundation for Medical Education and Research Terms and Conditions

2. Fig. 1
Initial electrocardiogram obtained on Nov. 11, 1991, during episode of vague chest pain in 69-year-old man. Creatine kinase concentration was increased to 803 U/L. Note that T-wave configuration and QTc interval are normal.
Mayo Clinic Proceedings  , DOI: ( /S (12)61341-X)
Copyright © 1994 Mayo Foundation for Medical Education and Research Terms and Conditions

3. Fig. 2
Electrocardiogram obtained on Nov. 19, 1991, during cardiac and neurologic deterioration. Note deeply inverted T waves inferolaterally and prolonged QTc interval.
Mayo Clinic Proceedings  , DOI: ( /S (12)61341-X)
Copyright © 1994 Mayo Foundation for Medical Education and Research Terms and Conditions

4. Fig. 3
Electrocardiogram obtained on Dec. 3, 1991, 2 weeks after patient's precipitous decline. Neuropsychiatric symptoms had considerably diminished. Note that inverted T waves and prolonged QTc are still present.
Mayo Clinic Proceedings  , DOI: ( /S (12)61341-X)
Copyright © 1994 Mayo Foundation for Medical Education and Research Terms and Conditions

5. Fig. 4
Electrocardiogram obtained on Dec. 26, 1991, 5 weeks after patient's precipitous decline. Neuropsychiatric symptoms continued to resolve. Note that T-wave abnormality and prolonged QTc are no longer present.
Mayo Clinic Proceedings  , DOI: ( /S (12)61341-X)
Copyright © 1994 Mayo Foundation for Medical Education and Research Terms and Conditions