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5 Cards in this Set

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  • Back
Define stroke volume, end-diastolic and end-systolic volumes
- End-systolic volume = volume of blood in the ventricles after systole
- End-diastolic volume = volume of blood in the ventricle at the end of diastole
- Stroke volume = end diastolic volume - end systolic volume
- The ejection fraction is usually >55% of diastolic volume in health
What is the Bainbridge reflex?
- Typifies the role of the medulla of the brain in cardiovascular reflexes
- If stretch is too great then heart rate must be increased to avoid rupture to maintain output
What are the effects on renin secretion during hemorrhage?
What are the 3 types of tachycardia?
1. Sinus = all appears normal but slow
2. Narrow complex = QRS very short
3. Broad complex = QRS very long (also known as ventricular tachycardia)
What are the 2 types of 2nd degree heart block and how can they be determined on an ECG?
1. Mobitz type II
- Regularly irregular
- There is a constant normal PR interval, but there are isolated P waves without following QRS complexes
- Every second or third etc P wave is followed by a QRS

2. Mobitz type I (Wenkebach)
- Common in atrial fibrillation or flutter
- Irregularly irregular
- The PR interval progressively increases and then there is one isolated P wave without a following QRS complex, felt as a skipped beat, before beginning again