| Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle | |
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| موضوع: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الجمعة مارس 30, 2012 12:45 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الجمعة مارس 30, 2012 9:52 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الأحد أبريل 01, 2012 6:04 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الأحد أبريل 01, 2012 2:28 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الثلاثاء أبريل 03, 2012 5:55 am | |
| Question: What is the effect of diurnal variations on blood pressure Answer: Blood pressure varies across the day being highest in the morning and lower towards evening and this is called the "diurnal variation." Some decrease should occur during sleep the cause of being increased in the morning: 1-on standing from lying down, there release of some catecholamines which increase ABP 2-thinking of what should be done after awaking up causes sympathetic stimulation which increases ABP | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الثلاثاء أبريل 03, 2012 5:57 am | |
| Question: What is the cause of murmur in acute rheumatic fever Answer: : At 1st functional murmurs due to hyperdynamic circulation 2ry to fever THEN, organic murmurs, 2ry to acute rheumatic carditis and the most common murmurs of which are those due to mitral and aortic regurgitation caused by valvular inflammation | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الثلاثاء أبريل 03, 2012 9:00 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الجمعة نوفمبر 29, 2013 3:51 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الثلاثاء يوليو 01, 2014 7:54 am | |
| Q:
During measurement of BP:
1. Why do we tie the BP cuff at the level of the heart?
2. Palpatory method is used only to measure systolic BP, why not diastolic BP?
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A:
Regarding blood pressure examination:
1-We tie the BP cuff at the level of the heart to reflect the exact arterial blood pressure at the heart level as If the arm (or cuff) is lower than the heart, an erroneously high pressure will be recorded and if higher than the heart, the pressure will be erroneously low (refer to effect of gravity on BP). 2-Palpatory method is used as a rough preliminary estimation of systolic blood pressure to be confirmed by the auscultatory method to avoid the auscultatory gap, although some studies recently done to evaluate effect of palpatory method on measuring diastolic blood pressure which has some limitations as shivering, tremor, severe obesity, and moderate to severe hypotension. Shivering and tremor causes mechanical interference in measurement. In severe obese thick subcutaneous fat probably prevent thrill to transmit to surface. Elderly patient have very thin subcutaneous fat, which leads to continuous palpation of pulse throughout measurement and pose difficulty to identify thrill in pulse. Also, palpatory method need more experience and clinical sense. The final result is that in some conditions we may be obligated to estimate diastolic blood pressure using palpatory method as if stethoscope is not present, but, still estimation of systolic blood pressure by palpation (absence of pulse while increasing pressure in cuff and its reappearance with deflation) is more easy and standard than for diastolic blood pressure (absence or weakening of pulse during deflation).
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الأحد فبراير 22, 2015 8:44 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الأربعاء فبراير 10, 2016 11:29 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الخميس نوفمبر 10, 2016 6:37 am | |
| Question Fetal hearts use glucose as their primary metabolic substrate. Adult hearts use free fatty acids, which are less efficient (require more O2 to synthesize the same amount of ATP); however, during cardiac failure, the heart can switch to glucose utilization. Why doesn't it just use glucose all the time? ======== Answer Lipids require more oxygen to burn, but also they are cheaper to store (since they have great calorific power than carbohydrates and they're hydrophobic, thus not requiring water for their storage). The body can store so much lipids that it becomes an almost everlasting energy source (A normal adult have enough energy stored as fat to allow basal metabolism for weeks to months), which cannot apply to glucose. If fat is not present, glucose would have vanished from the body long time ago. Glucose levels must be maintained at a certain level, because it's the main energy source for the brain (which cannot use lipids).
For all the previous reasons, the heart (and many other organs, like the liver) uses fat while possible. If possible just means when not starving to death and with sufficient oxygen supply. This second condition doesn't apply to heart failure. In this case, oxygen supply fails and the tissue switch to glucose just because they can use it without oxygen (glycolysis and lactic fermentation).
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الأحد مارس 26, 2017 5:47 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الأربعاء مايو 10, 2017 9:39 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الخميس أكتوبر 12, 2017 10:29 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الثلاثاء ديسمبر 12, 2017 10:08 am | |
| Q: Mary's law ====== A: Mary's law In 1859, a French scientist Étienne-Jules Marey noticed that when at rest a person's pulse rate is inversely proportional to blood pressure. Or in other words, the slower the heart beats, the higher the blood pressure is..
It is important to note that the dependent variable in this equation is the blood pressure. Assuming that everything else is normal, and the person is not exercising, unhealthy, or stressed, his blood pressure will determine the rate at which hisheart beats.
This effect comes about because the body responds to lowered blood pressure, in the short term, by increasing the heart rate. Conversely, when blood pressure is too high, the heart will slow.
This 'law' does not apply in all conditions; for example, during exercise heart rate will increase (to supply oxygen to the working muscles), but diastolic blood pressure will remain approximately the same (because blood vessels in the working muscles dilate to accept more blood flow). A more technical counterexample is the Bainbridge reflex, when an increase in right atrial pressure results in an increased heart rate.
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الأربعاء يناير 03, 2018 11:24 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الإثنين يناير 22, 2018 11:01 am | |
| Question How negative interstitial hydrostatic pressure is considered as a safety factor against edema formation === Answer
when the intersttial hydrostatic pressure is negative it acts as a safety factor against edema as there will be a low compliance of interstitium decreasing the incidence of edema formation, but if it becomes positive the compliance will increase facilitating edema formation
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
in normal tissues with negative interstitial fluid pressure, virtually all the fluid in the interstitium is in gel form. That is, the fluid is bound in a proteoglycan meshwork so that there are virtually no "free" fluid spaces larger than a few hundredths of a micrometer in diameter. The importance of the gel is that it prevents fluid from flowing easily through the tissues because of impediment from the "brush pile" of trillions of proteoglycan filaments. Also, when the interstitial fluid pressure falls to very negative values, the gel does not contract greatly because the meshwork of proteoglycan filaments offers an elastic resistance to compression. In the negative fluid pressure range, the interstitial fluid volume does not change greatly, regardless of whether the degree of suction is only a few millimeters of mercury negative pressure or 10 to 20 mm Hg negative pressure. In other words, the compliance of the tissues is very low in the negative pressure range
in other words
low compliance of the interstitium when interstitial fluid pressure is in the negative pressure range, -compliance of the tissues, defined as the change in volume per millimeter of mercury pressure change, . -it is low as long as the interstitial fluid hydrostatic pressure is in the negative pressure range . -normally the interstitial fluid hydrostatic pressure is -3, so it must increase by 3 mm Hg before large amounts of fluid will begin to accumulate in the tissues in other words
in the negative pressure range, there is low compliance of the interstitium i.e. small increases in interstitial fluid volume cause relatively large increases in interstitial fluid hydrostatic pressure, opposing further filtration of fluid into the tissues i.e. prevents edema
when interstitial fluid pressure rises to the positive pressure range, there is a tremendous accumulation of free fluid in the tissues. In this pressure range, the tissues are compliant, allowing large amounts of fluid to accumulate with relatively small additional increases in interstitial fluid hydrostatic pressure.
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الأحد أغسطس 26, 2018 7:12 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الإثنين أكتوبر 07, 2019 9:11 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle الخميس أكتوبر 10, 2019 2:12 pm | |
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| Some short essay questions on CVS physiology with their answers by Dr Khaled A Abulfadle | |
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