NURS 3500 - Test #3 – Cardiovascular Questions with Complete Solutions

NURS 3500 - Test #3 – Cardiovascular Questions with Complete Solutions Electrical Conduction of Heart - Correct Answer - Electrical impulses from myocardium make contractions - SA node, the heart's "natural pacemaker" @ top of atrium releases impulse causing atrium to contract - Signal passes through AV node, causing ventricle filling - AV node checks signal and sends it through muscle fibers of ventricles causing them to contract Depolarization - Correct Answer - Electrical stimulation Repolarization - Correct Answer - Reset & relaxation Sinus Rhythm: P Wave - Correct Answer - Atrial depolarization (stimulation) Sinus Rhythm: QRS complex - Correct Answer - Depolarization of ventricles (stimulation) - More stimulation needed for ventricles - <.12 seconds Sinus Rhythm: PR Interval - Correct Answer - Time it takes for impulse to go from atrial systole to before ventricle systole - Time between stimulation of atrium and stimulation of ventricles - .12-.20 seconds Sinus Rhythm: Q Wave - Correct Answer - Atrial repolarization (relaxation) Sinus Rhythm: T Wave - Correct Answer - Repolarization of ventricles (relaxation) Chest Radiograph (X-Ray or CXR) - Correct Answer - Used to detect size & position of heart and abnormalities of the heart and lungs - Light areas show consolidation or where light is absorbed by body - Dark areas represent x-ray passing through the body Electrocardiogram (ECG or EKG) - Correct Answer - Records electrical signals as they travel through the heart - Used to look for patterns among heartbeats and rhythms and to diagnose various heart conditions - Can detect: arrhythmias, blocked or narrow coronary arteries, structural problems in heart chambers, previous heart attack Echocardiogram - Correct Answer - Uses sound waves to produce images of heart beating and pumping blood - Images can be used to identify heart di