Related Experiment Video
Updated: Feb 2, 2026

A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry
Published on: March 13, 2014
A 15-Year-Old Male With Wide Complex Tachyarrhythmia
Philip S Nawrocki1, Matthew Poremba1
1Department of Emergency Medicine, Allegheny General Hospital, Pittsburgh, PA.
Abstract:
A 15-year-old male presented with exertional syncope and was found to be in an unstable regular wide complex tachyarrhythmia (WCT). After a trial of antiarrhythmic medication, his clinical condition declined, necessitating synchronized cardioversion. Although he noted symptomatic improvement after cardioversion, he was found to be in third-degree heart block. The patient was transported by rotor wing aircraft to a pediatric cardiac intensive care unit where he was ultimately diagnosed with Lyme disease. He was treated with a course of intravenous antibiotics, his heart block resolved, and he was discharged home with a good neurologic outcome.
Related Concept Videos
Dysrhythmias II: Classification of Tachyarrhythmias
Other Nuclides: 31P, 19F, 15N NMR
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
Infertility in Males
The Y Chromosome Determines Maleness
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size....
Disorders of the Male Reproductive System
Prostate disorders are another major concern. These conditions can impair urinary flow due to the prostate's location around the urethra....
Accessory Ducts of the Male Reproductive System
The epididymis is a small, comma-shaped organ located at the back of each testicle....

