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A 62-yeаr-оld mаle with а histоry оf severe hypertension is admitted to the emergency department presenting with acute, severe diarrhea and dehydration. Upon assessment, his blood pressure is dangerously low at 80/50 mmHg. To evaluate his current renal function, a resident notes his baseline and current renal pressures. Under normal physiological conditions, his renal corpuscle dynamics are standard. However, in his current acute state, his systemic hypotension has dropped his glomerular capillary hydrostatic pressure ($P_{GC}$) significantly. Assume the following values for the patient's current state: Glomerular capillary hydrostatic pressure 38mmHg Bowman’s space hydrostatic pressure 12mmHg Glomerular capillary colloid osmotic pressure 28 mmHg Note: Proteins are not filtered into the Bowman's space. Questions Part A: Quantitative Analysis Write the mathematical formula for Net Filtration Pressure (NFP) using the relevant forces. Using the values provided in the scenario, calculate the patient's current NFP. Include proper units. Based on your calculation, what is dynamically happening to fluid movement at the glomerulus? Part B: Physiological Mechanism & Regulation The body will attempt to initiate compensatory mechanisms to defend GFR despite the drop in systemic blood pressure. The Myogenic Mechanism: Explain how the afferent arteriole would normally respond to a drop in renal blood flow to maintain GFR. If the patient's mean arterial pressure (MAP) falls below 60 mmHg, explain why this autoregulatory mechanism fails. Hormonal Regulation: Name the primary hormone cascade activated by the juxtaglomerular (JG) cells in response to this patient's dehydration and low blood pressure. Specifically, describe how Angiotensin II works to selectively alter the diameters of the afferent and efferent arterioles to rescue GFR. Part C: Clinical Prediction If this patient is chronically taking an ACE inhibitor (a medication that blocks the production of Angiotensin II) for his pre-existing hypertension, predict what will happen to his GFR compared to a healthy individual experiencing the same level of dehydration. Explain your reasoning by referencing specific Starling forces.
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