What Happens When the Electrical Activity of Your Heart Changes?

The heart's electrical conduction system plays a very important role in cardiovascular functioning. Also known as the atrioventricular (AV) conduction system, it regulates and controls the timing of the heartbeat.

How does the heart's electrical conduction system work?

There is a collection of electrical cells in the upper right atrium of the heart known as the sinoatrial (SA) node which acts as a natural pacemaker and generates electrical signals. These signals travel through specialized electrical pathways and stimulate the muscular walls of the heart to contract in a rhythmic manner. This gives rise to the heartbeat that pulses at a specific frequency every minute.

What is the effect of fluctuations in electrical activity on the heart?

The standard heart rate in human being ranges from 60 to 100 beats per minute. It slows down when a person sleeps and speeds up when one experiences physical or emotional heightening. These fluctuations are triggered by the brain or other systems of the body and signal the SA node to generate charges more rapidly or slowly. This leads to spikes and drops in the heart rate, depending on the nature of the situation.

What happens when there is dysfunction in the heart's electrical activity?

When the heart's electrical conduction system does not function properly, it leads to the occurrence of a condition known as arrhythmia or abnormal heart rhythm. This happens when electrical impulses are generated in an irregular manner and causes tachycardia (rapid heartbeats) or bradycardia (slow heartbeats) which takes place in jarring infrequent tempos.

What causes fluctuations in the heart's electrical activity?

There are various kinds of triggers that cause the heart rate to fluctuate. The exact nature of fluctuation also depends on the type of trigger. A few everyday examples of these causes are as follows:
- Exercise and strenuous physical activity increases electrical activity as the heart is required to beat faster so as to increase the supply of blood and oxygen to the muscles.
- Sleep and rest reduce heart rate as the body is not needed to exert itself.
- Release of adrenaline into the bloodstream causes the heart rate to spike up.



What Happens When the Electrical Activity of Your Heart Changes?

My child complains of Chest Pain. Should you be worried?

Chest pain is a common complaint among children. For a parent, it can be worrisome because there is a natural tendency to associate chest pain with the heart. The good news is, in more than 95% of cases, chest pain is non-cardiac in origin.

What signs will tell me that the pain may be related to the heart?

Chest pain that occurs in association with certain pointers needs a thorough evaluation. Some of the features that may suggest a heart-related condition include:

Associated breathing difficulty or dizziness
Chest pain that is brought on by exercise
When cardiac disorders run in the family or there have been sudden deaths at a young age in the family
A past medical condition like Kawasaki disease or connective tissue disorder
The following features suggest that a non-cardiac cause is likely:

If the pain follows direct trauma to the chest or is worsened on local pressure: the muscles or bones that form the chest wall are the likely origin of pain
Wheezing or fever and cough: a lung problem is likely
A burning pain beneath the breastbone, especially in relation to certain types of food: may be related to the digestive system
A stressful situation at school or home: a psychological cause of chest pain may be considered.
What can I expect at the doctor s visit?

If your child complains of chest pain, it is important to take him or her to the doctor. Your doctor will first take a detailed history and examine the child. ECG, a record of the electrical activity of the heart, gives an initial idea whether or not the pain may be related to the heart. Other tests that may be ordered include a chest XRay, a  heart-scan  (echocardiogram), a stress test, or further tests based on the findings on evaluation.

Chest Pain In Children - Should You Be Worried?

For a long time cholesterol in totality was seen as a bad thing for your body although the truth was a little more complicated than that. Cholesterol primarily is divided into two types, one of which can be categorized as bad cholesterol and the other as good cholesterol. Let's have an in-depth look at both the categories.

Ldl or low density lipoprotein aka bad cholesterol: cholesterol is a wax like chemical which is found all over the body and it has important functions to perform. Cholesterol is carried all over the body by lipoproteins. The low density lipoproteins are denoted as bad cholesterol as they can accumulate on the walls of the blood vessels and cause blockages resulting in many ailments. Ldl levels of 190 and above are considered dangerous. 

Some of the risks associated with it are:
1. Heart disease
2. Stroke
3. Atherosclerosis
4. Peripheral artery disease among many others

Hdl or high density lipoprotein aka good cholesterol - this is a form of cholesterol which is usually desired in higher quantities as it removes ldl from the system by dislodging it from the arteries and then carrying it through the bloodstream into the liver. The liver then breaks it down and removes it from the body. Thus, higher number of hdl cholesterol is always desirable. Some of the ideal numbers for hdl cholesterol within the body are:

For women - ideal: 60 mg/dl, dangerous: 50 mg/dl or lower
For men - ideal: 60 mg/dl, dangerous: 50 mg/dl lower

The role of triglycerides
Good and bad cholesterol levels also depend on the levels of triglycerides within the body and not just ldl or hdl cholesterol. Triglycerides are another type of fat which are used to store energy within the body, but can also affect your health. It is most associated with atherosclerosis when the levels of triglycerides are high within the body. 

Some habits that contribute to high levels of it are
A. Lack of physical activity
B. Obesity or being overweight
C. Excesses in alcohol consumption
D. Smoking
E. Bad diet and others

Thus the good cholesterol vs bad cholesterol war also includes other factors, most of which can be easily changed by making subtle changes in lifestyle and incorporating healthier habits. This will increase the good cholesterol and the other relevant elements and reduce the bad.

Good Cholesterol Vs Bad Cholesterol

Bradycardia is a condition which in basic terms means slow beating of the heart. In most cases, the typical rate is 60 to 100 beats in a minute when the person is at rest. In case your heart beats less than 60 times in a minute, then it is slower than normal. But a slow heart rate is not always a health concern even though sometimes it could indicate issues with of the heart.

What could bradycardia mean?
Some people with slow heart rate or bradycardia tend to be very fit, and they have no underlying health issues. Athletes and healthy young adults often have a heart rate lower than 60. But in others, bradycardia indicates that the natural pacemaker of the heart is not working well, or the electrical pathways have been disrupted. In severe forms of the problem, the heart may beat so slowly that it fails to pump adequate blood for meeting the needs of the body. This may show some symptoms and could be fatally dangerous.

What are the causes of bradycardia?
There are various causes of bradycardia, and some of them include:

Alterations in the heart which results from aging
Health conditions that slow down the electrical impulse through the heart. This may include electrolyte imbalance, low thyroid levels, and others.
Diseases which may disrupt the electrical system of the heart including heart attack, coronary artery disease, and myocarditis.
Certain medications that are used for treating heart problems like high blood pressure or hypertension, arrhythmia, and beta-blockers, and digoxin.
What are the symptoms of bradycardia?
When a person has very slow heart rate, he or she may experience lightheadedness or dizziness, feeling short of breath, having difficulties in doing normal activities or exercising, having chest pain, feeling tired and fatigued. In some cases, it is seen that the person may have palpitations, feeling confused, trouble in concentrating and fainting.

What s worse, some people don t have any symptoms at all, or their symptoms are so negligible that they think they are caused just because of aging. The best way to understand whether you have this problem is to take the pulse, and in case, it is slow or uneven, you must talk to a doctor.

How is bradycardia diagnosed and treated?
Bradycardia tends to come and go from time to time, and therefore, a standard EKG is not always able to detect it. A standard ambulatory electrocardiogram is used for detecting the condition, and sometimes, blood tests are also necessary.

The treatment of bradycardia is entirely dependent on the cause of the problem and its symptoms. It is worthy of mention here that in case the problem is not causing any symptoms, then they would not be treated under usual circumstances.

An Effective Guide To Bradycardia!

High blood pressure is a condition which occurs when the pressure of the blood flow through the arteries increases, resulting in intense pressure. Hypertension occurs when the systolic pressure (pressure at which the heart pumps blood) and the diastolic pressure (pressure at which the heart relaxes) is more than 140 and 90 respectively.

Symptoms of high blood pressure are: 

1. Shortness of breath

If you have high blood pressure, then you may experience regular shortness of breath.

2. Headaches

You may experience headaches on a regular basis.

3. Weakness of the heart muscles

Hypertension results in a weak heart which may not be able to pump blood properly.

4. Narrowing of blood vessels

Narrowing of blood vessels may lead to other complications such as failure of the kidneys, heart, and brain.

5. Vision problems

It may lead to vision problems as blood vessels in the eye may be affected.

The various causes of blood pressure are: 

1. Tobacco
If you smoke on a regular basis, you put yourself at an increased risk of getting affected by blood pressure.

2. Lifestyle
Not exercising regularly, eating a sodium-rich diet are all factors which can increase the chances of hypertension.

3. Age
The chances of getting affected by hypertension increase as you age.

4. Weight
Being excessively obese also increases your risk of getting affected by hypertension.

5. Diabetes
Being diabetic makes you more prone to getting affected by diabetes.

6. Hyperthyroidism
If you have an overactive thyroid gland, then it may result in hypertension.

Hypertension may result in various health complications in the body such as:

1. Aneurysm

This is a disorder of the blood vessels which causes the blood vessels to bulge and weaken.

2. Heart attack

High blood pressure causes the arteries to harden and thicken which may lead to a heart attack.

3. Metabolic syndrome

This syndrome refers to a group of complications such as high bad cholesterol levels and insulin levels in the body.

4. Impaired brain functioning
It may also impair your ability to learn and impact your cognitive skills.

Hypertension and High Blood Pressure

Causes and Symptoms of Renal Hypertension

High blood pressure is characterized by an increased force that the blood exerts on the blood vessels when it moves through the body. Renal hypertension is a blood pressure disorder where the arteries that carry blood to the kidneys become narrow, as a result of which the blood pressure through these vessels increases.

Causes

It is caused when the arteries that supply blood to the kidney get narrow or get blocked. This can cause the kidney to release specific hormones that signal the body to retain water and sodium. This can put additional pressure on the blood vessels which leads to increased blood pressure. It can also be caused by atherosclerosis which is characterized by hardening of the arteries. Improper development of the arteries can also lead to renal hypertension.

Symptoms

The symptoms of renal hypertension are:

Feeling confused
Blurred vision
Regular headaches
Bleeding from the nose
Gradual decline in kidney function
Possible long-term damage to the kidney
Feeling lethargic and drowsy
Loss of appetite
Dryness in skin
Muscle cramps
Breathing difficulties

Treatments

The diagnostic procedure for this disorder consists of blood, urine, doppler ultrasound and CT angiography or MR angiography tests. Treatments for this disorder usually include medications to ease blood pressure. Preventive measures include modifications in lifestyle such as following a proper diet, limiting smoking, restricting sodium or salt in the diet and following an exercise regimen. Steps should also be taken to reduce stress. Yoga and meditation are highly beneficial to control the condition. Sometimes intervention is needed in the form of PTRA and stenting.

High Blood Pressure and Kidney Disease - Causes and Symptoms!

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