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Compensation In Acid/base Imbalances
Respiratory compensation for metabolic acidosis (HNC excess) produces systemic hypocapnia (low PCO2). CO2 diffuses from CSF to the body causing the CSF pH to increase. This reduces the central chemoreceptor-stimulated ventilation, partly off-setting the increased stimulation of the peripheral chemoreceptors caused by the low arterial pH. Ventilatory stimulation (low arterial pH acting on peripheral chemoreceptors) Ventilatory inhibition (high CSF pH acting on the central chemoreceptor). What is the overall effect of the ventilatory stimulation and ventilatory inhibition? Respiratory compensation stops short of completely correcting the pH. Respiratory compensation cannot fully restore pH, but the kidney can (for metabolic acidosis anyway). For each H+ that is excreted in the urine (after all of the filtered HCO3- has been reabsorbed), and during ammonia production, new HCO3- enters the body. This added HCO3- titrates excess H+ and over 3 to 4 days the added HCO3- restores pH to 7.4. Renal Compensation Seen on Davenport nomogram Trajectory is along the RC line because as HCO3- is slowly added the pH changes, reducing the stimulation of the respiratory system. Summary of Renal Compe
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Response To Disturbances
The body tries to minimize pH changes and responds to acid-base disturbances with body buffers, compensatory responses by the lungs and kidney (to metabolic and respiratory disturbances, respectively) and by the kidney correcting metabolic disturbances. Body buffers: There are intracellular and extracellular buffers for primary respiratory and metabolic acid-base disturbances. Intracellular buffers include hemoglobin in erythrocytes and phosphates in all cells. Extracellular buffers are carbonate (HCO3–) and non-carbonate (e.g. protein, bone) buffers. These immediately buffer the rise or fall in H+. Compensation: This involves responses by the respiratory tract and kidney to primary metabolic and respiratory acid-base disturbances, respectively. Compensation opposes the primary disturbance, although the laboratory changes in the compensatory response parallel those in the primary response. This concept is illustrated in the summary below. Respiratory compensation for a primary metabolic disturbance: Alterations in alveolar ventilation occurs in response to primary metabolic acid-base disturbances. This begins within minutes to hours of an acute primary metabolic disturbance. Note
Understand medical acid base problems with this clear explanation from Dr. Seheult of http://www.medcram.com. Illustrations explain acidosis, acidemia, alkalosis, alkalemia, ABGs, pH, and more. This is video 1 of 8 on medical acid base. Other videos in the acid base series cover the key points of anion gap, metabolic acidosis, metabolic alkalosis, respiratory acidosis, respiratory alkalosis, and include practice problems to test your understanding. Speaker: Roger Seheult, MD Clinical and Exam Preparation Instructor Board Certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine. Co-founder of http://www.medcram.com. MedCram: Medical topics explained clearly including: Asthma, COPD, Acute Renal Failure, Mechanical Ventilation, Oxygen Hemoglobin Dissociation Curve, Hypertension, Shock, Diabetic Ketoacidosis (DKA), Medical Acid Base, VQ Mismatch, Hyponatremia, Liver Function Tests, Pulmonary Function Tests (PFTs), Adrenal Gland, Pneumonia Treatment, any many others. New topics are often added weekly- please subscribe to help support MedCram and become notified when new videos have been uploaded. Subscribe: https://www.youtube.com/subscription_... Recommended Audience: Health care professionals and medical students: including physicians, nurse practitioners, physician assistants, nurses, respiratory therapists, EMT and paramedics, and many others. Review for USMLE, MCAT, PANCE, NCLEX, NAPLEX, NDBE, RN, RT, MD, DO, PA, NP school and board examinations. More from MedCram: Complete Video library: https://www.youtube.com/c/medcram Facebook: https://www.facebook.com/MedCram Google+: https://plus.google.com/u/1/+Medcram Twitter: https://twitter.com/MedCramVideos Produced by Kyle Allred PA-C Please note: MedCram medical videos, medical lectures, medical illustrations, and medical animations are for medical educational and exam preparation purposes, and not intended to replace recommendations by your health care provider.
Acid Base Disorders
Arterial blood gas analysis is used to determine the adequacy of oxygenation and ventilation, assess respiratory function and determine the acid–base balance. These data provide information regarding potential primary and compensatory processes that affect the body’s acid–base buffering system. Interpret the ABGs in a stepwise manner: Determine the adequacy of oxygenation (PaO2) Normal range: 80–100 mmHg (10.6–13.3 kPa) Determine pH status Normal pH range: 7.35–7.45 (H+ 35–45 nmol/L) pH <7.35: Acidosis is an abnormal process that increases the serum hydrogen ion concentration, lowers the pH and results in acidaemia. pH >7.45: Alkalosis is an abnormal process that decreases the hydrogen ion concentration and results in alkalaemia. Determine the respiratory component (PaCO2) Primary respiratory acidosis (hypoventilation) if pH <7.35 and HCO3– normal. Normal range: PaCO2 35–45 mmHg (4.7–6.0 kPa) PaCO2 >45 mmHg (> 6.0 kPa): Respiratory compensation for metabolic alkalosis if pH >7.45 and HCO3– (increased). PaCO2 <35 mmHg (4.7 kPa): Primary respiratory alkalosis (hyperventilation) if pH >7.45 and HCO3– normal. Respiratory compensation for metabolic acidosis if pH
Content currently under development Acid-base disorders are a group of conditions characterized by changes in the concentration of hydrogen ions (H+) or bicarbonate (HCO3-), which lead to changes in the arterial blood pH. These conditions can be categorized as acidoses or alkaloses and have a respiratory or metabolic origin, depending on the cause of the imbalance. Diagnosis is made by arterial blood gas (ABG) interpretation. In the setting of me ...
Arterial Blood Gas Analysis, Part 2 Introduction Acute vs. Chronic Respiratory Disturbances Primary Metabolic Disturbances Anion Gap Mixed Disorders Compensatory Mechanisms Steps in ABG Analysis, Part II Summary Compensatory Mechanisms Compensation refers to the body's natural mechanisms of counteracting a primary acid-base disorder in an attempt to maintain homeostasis. As you learned in Acute vs. Chronic Respiratory Disturbances, the kidneys ca ...
Assessment of Compensation in Acute Respiratory Acidosis Mechanisms and classification of metabolic acidosis This chapter is concerned with the changes in pH and serum bicarbonate which result from acute fluctuations in dissolved CO2, as a consequence of acute changes in ventilation. It is a more detailed look at the wayCO2interacts with the human body fluid, and the resulting changes which develop in theserum bicarbonate concentration and pH. T ...
Practice Essentials Metabolic acidosis is a clinical disturbance characterized by an increase in plasma acidity. Metabolic acidosis should be considered a sign of an underlying disease process. Identification of this underlying condition is essential to initiate appropriate therapy. (See Etiology, DDx, Workup, and Treatment.) Understanding the regulation of acid-base balance requires appreciation of the fundamental definitions and principles unde ...
Acid base disorders 1. What is normal pH? Normal Values pH = 7.38 - 7.42 [H+] = 40 nM/L for a pH of 7.4 PaCO2 = 40 mm Hg [HCO3] = 24 meq/L 2. What is the definition for acid base disorder? Acid base disorder is considered present when there is abnormality in HCO3 or PaCO2 or pH. 3. What does acidosis or alkalosis refer to? Acidosis and alkalosis refer to in-vivo derangement's and not to any change in pH. 4. What does acidemia or alkalemia refer t ...
Approach Considerations Treatment of acute metabolic acidosis by alkali therapy is usually indicated to raise and maintain the plasma pH to greater than 7.20. In the following two circumstances this is particularly important. When the serum pH is below 7.20, a continued fall in the serum HCO3- level may result in a significant drop in pH. This is especially true when the PCO2 is close to the lower limit of compensation, which in an otherwise heal ...