Related Experiment Video
Updated: Feb 11, 2026
10:34
A Swimming-Induced Zebrafish Exercise Apparatus for Versatile Training Approaches
Published on: October 18, 2024
1.9K
Exercise induced left bundle branch block in isotopic exercise test. Findings and prognostic value
M V Gomez1, B C Lorente Castro2, P Jané2
1Medicina Nuclear, Hospital Ramón y Cajal, Madrid, España.
Revista Espanola De Medicina Nuclear E Imagen Molecular
|April 23, 2018
Summary
Exercise-induced left bundle branch block (EI-LBBB) is rare and occurs more often in women. This study found EI-LBBB did not increase the risk of major cardiovascular events in patients undergoing exercise stress tests.
Area of Science:
- Cardiology
- Nuclear Cardiology
- Diagnostic Imaging
Background:
- Exercise-induced left bundle branch block (EI-LBBB) is an uncommon finding during cardiac stress testing.
- Its clinical significance and prognostic implications remain largely unknown.
Purpose of the Study:
- To investigate the scintigraphic characteristics of EI-LBBB.
- To evaluate the prognostic value of EI-LBBB in patients undergoing exercise stress testing.
Main Methods:
- Retrospective review of 1,885 patients undergoing GATED-SPECT ergometry.
- Analysis of 7 patients who exhibited EI-LBBB during exercise testing.
- Coronary angiography and long-term cardiovascular event monitoring (30±8 months).
Main Results:
- EI-LBBB prevalence was 0.37%, predominantly observed in women (6/7).
- Myocardial function and perfusion were normal in 3 patients; perfusion defects were present in 4.
- No coronary artery disease was detected in patients with perfusion defects.
Conclusions:
- EI-LBBB is a rare finding, more prevalent in women.
- In this cohort, EI-LBBB was not associated with coronary artery disease or an increased risk of major cardiovascular events.
- Non-ischaemic structural heart disease was noted in 2 patients.
Related Concept Videos
01:26Exercise Stress Test
1.4K
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
1.4K
01:27Exercise and Muscle Performance
2.5K
Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
2.5K
01:17Exercise and Cardiac Output
2.0K
Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be...
Sustained exercise increases the muscles' oxygen demand, which can be...
2.0K
01:20Exercise and Cardiovascular Response
4.5K
Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
4.5K
01:12Isotopes
65.0K
Elements have a set number of protons that determines their atomic number (Z). For example, all atoms with eight protons are oxygen; however, the number of neutrons can vary for atoms of the same element. The sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are called isotopes. Elements can have multiple isotopes, for example, carbon-12, carbon-13, and carbon-14.
An element's atomic mass, or weight,...
An element's atomic mass, or weight,...
65.0K
02:31Elements: Chemical Symbols and Isotopes
127.3K
A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
127.3K