Interconnection of CV-system and resp. functions Flashcards
What is respiratory sinus arrythmia?
A physiological phenomenon where heart arrythmias can be detected on an ECG during a respiratory cycle of deep inspiration and expiration.
Examples of coordination between systems:
resp. sinus arrythmia
altered heart frequency during apnea (stop breathing in expirium)
Valsalva maneuver
What is valsalva maneuver?
A vagal maneuver –> forcible exhalation against closed airways. Causes bradycardia which can be detected by ECG (or by pulse palpation)
How can altered heart frequency during apnea be detected?
By ECG or by pulse palpation
AIMS
ECG recording during resp. cycle
ECG during apnea
Pulse palpation during apnea
Evaluation
What happens during valsalva maneuver?
intrathoracal pressure increases and venous return to the heart can be decreased.
Who introduced valsalva maneuver?
Italian physician Antonio Mario Valsalva
What is Müller maneuver?
Reverse of valsalva maneuver. designed to look for collapsed parts of airways. Inspiration with closed mouth and nose.
Used to help determine cause of sleep apnea.
What can Vagal manouvers be used for?
- Medical examinations to test cardiac functions and autonomic control of the heart. –>ex. Tachyarrythmias
- Diagnostics of murmurs (subaortal stenosis)
- Equalize pressure in ears
What is tachyarrythmias?
Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate. A resting heart rate over 100 beats per minute is accepted as tachycardia in adults.
How can vagal maneuvers help with tachyarrythmia?
It slows down the conduction from the AV- nodes and decrease the heart rate.
Incr. intrathoracical press. and decrease venous return to the heart.
