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A 38-year-old member asked:

what's the relation between heart rate and respiratory rate? is there any formula to calculate one given the other?

1 doctor answer3 doctors weighed in
Dr. John Garner
Cardiology 16 years experience
AWESOME question: This is a great question. The physiology is crazy complex, and unfortunately the answer is that hr and rr are *not* linked. Hr is driven by o2 demand, and rr is driven (in a normal non-diseased person) by co2 level in the blood. However, you're sidling up to something called the fick equation that shows that heart rate changes to match oxygen demand, which usually means higher resp rate.

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A 51-year-old member asked:

Are heart birth defects cause for major concern?

2 doctor answers13 doctors weighed in
Dr. Anatoly Belilovsky
Pediatrics 35 years experience
Yes: Some more than others. Vsd, a type of "hole in the heart", sometimes closes on its own, while others may be life-threatening within minutes of birth.
A 41-year-old member asked:

How does HDL cholesterol affect your chance of developing heart disease?

2 doctor answers6 doctors weighed in
Dr. James Strader
Cardiology 22 years experience
High HDL lowers risk: You want your HDL to be as high as possible. A high HDL lowers the risk for coronary artery disease and other forms of vascular disease. The best way to raise your HDL is regular aerobic exercise, ideally 150 minutes /week, spread over 4-5 days.
A 47-year-old member asked:

Does having a slow heart beat cause dizziness?

1 doctor answer1 doctor weighed in
Dr. William Goldie
Pediatric Neurology 48 years experience
Poor blood flow: The balance centers of the brain depend on good blood flow to the brain. If the heart is beating slowly or is not pumping enough blood into the brain, you will feel dizzy. First is to lie down so that the blood flow does not have to go uphill. Next is to lift the legs to be sure enough blood is getting into the heart. If the brain does not get enough blood flow, you can pass out and fall.
A 31-year-old member asked:

What type of exercise is best for the heart muscle?

1 doctor answer4 doctors weighed in
Dr. James Strader
Cardiology 22 years experience
Aerobic: The aha recommends 150 minutes / week of moderate aerobic activity spread over 4-6 days for optimal cardiovascular health.
A 23-year-old member asked:

Why do I have extreme dizziness and heart palpitations!?

2 doctor answers2 doctors weighed in
Dr. William Goldie
Pediatric Neurology 48 years experience
Vertigo?: The spinning sensation is called vertigo. Causes are either from ear or brain or side effect of drugs. If it occurs when lying still in bed, it is probably due to a disturbance in the brain. Pure vertigo is very rarely a seizure. More often it is due to poor blood flow to the back of the brain. Heart and blood pressure problems need to be considered. Migraine may be cause if rest is fine.

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Last updated Jan 15, 2014

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