What is the 4th step of the cardiac cycle?
Fluid pressure in filling the atria opens AV valves so blood can flow into ventricles
Label this diagram.
R1 - Sinoatrial SA node
R2 - right atrium
R3 - Bundle of conducting muscle fibres
R4 - Right ventricle
L1 - Left atrium
L2 - Atrioventricular AV node
L3 - Left ventricle
L4 - Purkin fibres
What does the SA node do in the heart?
Releases electrical impulses setting the pace of the heart rhythm. This node causes impulses to travel throughout the atria leading to contraction. A for atria.
What does the AV node do in the heart?
The AV node acts as a circuit breaker as it slows or blocks impulses that are too closely spaced giving blood enough time to enter the ventricles. This node funnels impulses within the ventricles. V for ventricle
True or False? During a blood pressure test your blood flow will temporarily stop.
What is the difference between systolic and diastolic?
Blood pressure readings are given in two numbers. The top number is the maximum pressure your heart exerts while beating (systolic pressure). The bottom number is the amount of pressure in your arteries between beats (diastolic pressure).
What is the normal range for systolic pressure in the heart?
What is the normal range for diastolic pressure in the heart?
What is hypotension in the heart?
Hypotension is the medical term for low blood pressure. Low blood pressure in terms of systolic pressure is lower than 100 and for diastolic it is less than 60.
What is prehypertension in the heart?
Prehypertension is a warning sign. It means that you're at a greater risk of high blood pressure.
Systolic pressure: 120-139
Diastolic pressure: 80-139
What is hypertension in the heart?
High blood pressure. Systolic: 140 and above. Diastolic: 90 and above.
True or False? The heart is the only organ in the body that doesnt require blood supply as its constanly connected to blood anyway.
False, the heart has its own blood supply via coronary arteries which wrap around the heart.
Define a heart attack.
A coronary occlusion aka the partial or complete obstruction of blood flow in a coronary artery. The lack of blood supply to the heart will cause the death of the heart muscle termed a myocardial infraction.
What is a myocardial infraction?
The death of a muscle.
What is heart fibrillation?
Where the heart quivers instead of pumping due to disorganised electrical activity in the ventricles. (AV nodes)
What are some common medications used to treat a heart attack?
Asprin, thrombolytic, antiplatelet agents, blood thinning medicines, pain relievers, nitroglycerin, beta blockers, and ACE inhibitors
How is asprin used to treat a heart attack?
It reduced blood clotting
How is thrombolytic used to treat a heart attack?
It helps to dissolve a blood clot to the heart
How are antiplatelet agents used to treat a heart attack?
They help to prevent new clots and prevent existing clots from getting larger
How do other blood thinning medicines help treat a heart attack?
By further inhibiting blood clotting.
How are pain relievers used to treat a heart attack?
to reduce pain and discomfort
How is nitroglycerin used to treat a heart attack?
It reduces blood pressure and the load on the heart and can help improve blood floe to the heart by widening the blood vessels
How are beta blockers used to treat a heart attack?
They slow the heart rate and decrease blood pressure reducing damage of the heart muscle and prevent further attacks.
How are ACE inhibitors used to treat a heart attack?
This drug lowers blood pressure and reduces the stress on the heart.
What does senting do?
It is a wire mesh which widens blocked arterys by expanding against plaque build up.
Why are coronary artery bypass grafts done? CABG
They are done to bypass blockages in the heart via using veins from other places in the body most commonly the leg.