Related Experiment Video
Updated: Jun 27, 2026

Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment
Published on: June 25, 2019
Tet spell in an adult
Yi-Ming Weng1, Yu-Che Chang1, Te-Fa Chiu1
1Department of Emergency Medicine, Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Tao-Yuan, Taiwan.
Tetralogy of Fallot (TOF) can cause cyanotic spells, even in adults. This case highlights the importance of recognizing TOF in adults presenting with hypercyanotic crises to prevent severe outcomes.
Area of Science:
- Cardiology
- Pediatric Cardiology
- Emergency Medicine
Background:
- Central cyanosis, a bluish skin discoloration, typically arises from cardiovascular or pulmonary shunts.
- Tet spells, characterized by episodic cyanosis, are usually linked to congenital heart disease like Tetralogy of Fallot (TOF).
- Adults with untreated TOF are rare, making tet spells in this demographic an infrequent emergency department presentation.
Observation:
- A 29-year-old male presented with a cyanotic spell.
- The patient was diagnosed with Tetralogy of Fallot (TOF) after the event.
- This case underscores the potential for TOF to manifest in adulthood.
Findings:
- Tetralogy of Fallot (TOF) can present with hypercyanotic crises in adults.
- Adult-onset tet spells are uncommon but critical to identify.
- Prompt diagnosis and management of TOF in adults are crucial.
Implications:
- TOF should be considered in the differential diagnosis of hypercyanotic crises in adult patients.
- Early recognition and appropriate management of adult TOF can avert significant morbidity and mortality.
- This case emphasizes the need for awareness of TOF's unique adult manifestations and treatment strategies.
Related Concept Videos
Adult Stem Cells
Cognitive Development During Adulthood
Distinctive Features of Adult Stem Cells vs Cancer Stem Cells
Adult stem cells
Adult stem cells are tissue-specific; hence, they divide to develop the tissue from which they originate. One type of adult stem cell is the epithelial stem cell, which gives rise to the keratinocytes in the multiple layers of epithelial cells in the epidermis of the skin. Adult bone marrow has three distinct types of stem cells:...
Oppositional Defiant Disorder
Diagnostic Criteria and...
Cardiopulmonary Resuscitation I: Adult
Emerging Adulthood

