Questions tagged [cardiac-physiology]

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How can myocyte contract in "isovolumetric contraction" phase of cardiac cycle without shortening?

What is the difference between a contraction that shortens the muscle and generates force and the isovolumetric contraction that generates force with shortening the muscle??
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1answer
38 views

What is considered moderate when referring to (sub)acute hypertension, hyperthermia and tachycardia?

I'm reading about the toxicology of LSD, and the acute and subacute adverse effects (hypertension, hyperthermia, tachycardia) have been described as moderate in this article, modest in this article (...
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Bradyarrhythmia & Bradycardia- same or different?

Do Bradyarrhythmia & Bradycardia denote same abnormality or are there some finer differences between the two?? In text provided by my college, it appears bradycardia condition comes under the ...
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1answer
62 views

Why squatting leads to decrease in MVP murmur

Mvp = mitral valve prolapse Hcm = hypertrophic cardiomyopathy Now, I understand that during squatting preload and afterload will increase and both of them would lead to increased LV volume, but how ...
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Why do changes in Effective Refractory Period in Response to Antiarrhytmics occur and how do they help in treating the arrhythmia?

I am having trouble understanding two related concepts. First, why changes in ERP occur when there is the administration of certain antiarrhythmics (eg: Class IC). A neat explanation that I have ...
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What is the functional difference between cardio-pulmonary and the baroreceptors in the regulation of Blood pressure?

Guyton mentions two types of receptor- the baroreceptors and the cardiopulmonary receptors- that are involved in the maintenance of the acute changes in blood pressure. I just wanted to know how these ...