Summary of Chris Case, Dr. John Mandrola & Lennard Zinn's The Haywire Heart

Everest Media

Description

Please note: This is a companion version & not the original book.
Sample Book Insights:
#1 The heart is a two-pump organ that pumps blood to the lungs and body. The four chambers of the heart contract in a precisely timed choreography to keep the body supplied with oxygen. The two smaller chambers, called atria, push blood down to the two larger chambers, called ventricles.
#2 Blood pressure is the pressure that the blood puts on the walls of the blood vessels. It is measured in millimeters of mercury, and it depends on the force of the squeeze, the diameter and tension of the blood vessel walls, and the timing of the aortic valve closure.
#3 The heart is a muscle that conducts electricity from cell to cell. It is the only muscle in the body that can contract on its own without receiving a signal from the nervous system. The heart’s rhythm is called sinus rhythm, and it is coordinated by the SA node and the atrioventricular (AV) node.
#4 The His-Purkinje network is reliable, but it can be subject to outages. Left bundle branch block is one example: patients with LBBB have normal conduction of the portion of the impulse intended for the right ventricle through the right bundle, but conduction of the other half of the impulse is impaired; it bypasses the left bundle and must travel through the heart muscle to get to the left ventricle.

Sujets

• Santé et bien-être
• Santé du quotidien
• Santé au quotidien
• Santé au quotidien
• Diseases
• Disease
• Health
• Heart
• Fitness

Informations

• Publié par: Everest Media LLC
• Date de parution: 30 avril 2022
• Nombre de lectures: 0
• EAN13: 9781669394990
• Langue: English
• Poids de l'ouvrage: 1 Mo

Extrait

Insights on Chris Case and Dr. John Mandrola & Lennard Zinn's The Haywire Heart
Contents Insights from Chapter 1 Insights from Chapter 2 Insights from Chapter 3 Insights from Chapter 4 Insights from Chapter 5 Insights from Chapter 6 Insights from Chapter 7 Insights from Chapter 8 Insights from Chapter 9
Insights from Chapter 1

#1

The heart is a two-pump organ that pumps blood to the lungs and body. The four chambers of the heart contract in a precisely timed choreography to keep the body supplied with oxygen. The two smaller chambers, called atria, push blood down to the two larger chambers, called ventricles.

#2

Blood pressure is the pressure that the blood puts on the walls of the blood vessels. It is measured in millimeters of mercury, and it depends on the force of the squeeze, the diameter and tension of the blood vessel walls, and the timing of the aortic valve closure.

#3

The heart is a muscle that conducts electricity from cell to cell. It is the only muscle in the body that can contract on its own without receiving a signal from the nervous system. The heart’s rhythm is called sinus rhythm, and it is coordinated by the SA node and the atrioventricular (AV) node.

#4

The His-Purkinje network is reliable, but it can be subject to outages. Left bundle branch block is one example: patients with LBBB have normal conduction of the portion of the impulse intended for the right ventricle through the right bundle, but conduction of the other half of the impulse is impaired; it bypasses the left bundle and must travel through the heart muscle to get to the left ventricle.

#5

The heart is a muscle, and it conducts electricity only along its length. The muscles of the ventricles maintain their contraction until the blood has been pushed out of the exits and the aortic and pulmonary valves have closed, at which point those ventricle muscles all relax together.

#6

The heart has a number of transmembrane channels that allow charged particles to pass from one cell to another, making it similar to a wire that can transmit electricity. The difference in charge between the inside and outside of the cell membrane is called the membrane potential, which requires energy for the cell to create.

#7

The conduction of electricity through the heart is a critical step in its electrical coordination, and is an area where much heart rhythm disease occurs. When areas of the heart muscle become infiltrated with scar tissue, fat, or inflammation, these areas disrupt the smooth wave of electricity.

#8

The rate at which sodium depolarizes a cardiac cell is faster than in a skeletal-muscle cell, and this rapid sodium influx triggers the opening of L-type voltage-dependent calcium channels. This calcium enters the cell through special calcium channels, and this triggers the release of more calcium from the sarcoplasmic reticulum.

#9

The heart rate is controlled by the autonomic nervous system, and can be modified by stimuli from the sympathetic nerves, which increase the rate, and stimuli from the vagus nerve, which decrease the rate. The parasympathetic nervous system recognizes that blood flow is sufficient at a lower heart rate, and it sends signals to the SA node to reduce the rate.

#10

Premature contractions are not missed beats, but out-of-phase contractions. They feel like skipped beats because the heart chamber contracts before it has had a chance to fill with blood. They are usually caused by healthy pacemaker cells, but they can be created by clusters of cells that have gained enhanced automaticity and are behaving like pacemaker cells.

#11

The heart’s operation is a miracle. It is amazing that all of these complex chemical, electrical, and mechanical stimuli and responses occur repeatedly and perfectly, time after time, even at 200 beats per minute or more.

#12

Gene Kay was a 54-year-old man who was experiencing skipped beats.