AKI vs CKD / كيف تفرق بين فشل الكلى الحاد والمزمن اذا وجدت وظائف الكلى مرتفعة

TLDR;

This video provides a guide for doctors, especially recent graduates, on differentiating between acute kidney injury (AKI) and chronic kidney disease (CKD) in patients presenting with elevated creatinine and urea levels. It highlights the importance of distinguishing between these conditions to determine prognosis and management strategies. The key factors discussed include patient history, potential causes, ultrasound findings, urine output, trends in creatinine levels, presence of anemia, parathyroid hormone and calcium levels, potassium levels, proteinuria, severity of symptoms, and presence of bone disease.

• Differentiating AKI from CKD is crucial for prognosis and management.
• Key indicators include patient history, ultrasound, urine output, and lab results.
• AKI often presents with rapid changes and identifiable causes, while CKD develops gradually.

Introduction [0:00]

The video addresses how to distinguish between acute kidney injury (AKI) and chronic kidney disease (CKD) in patients with elevated creatinine and urea levels. It is aimed at helping doctors, particularly recent graduates, determine whether the kidney issue is a recent, reversible problem or a long-standing condition. The importance of accurate differentiation lies in predicting the likelihood of kidney function recovery and guiding appropriate patient management.

Why Differentiate Between AKI and CKD? [1:08]

It's important to differentiate between AKI and CKD to determine if the patient's kidney function is likely to return to normal. In AKI, recovery is often expected, influencing the decision to keep the patient hospitalized for treatment. Conversely, in CKD, understanding the patient's baseline creatinine level helps in managing further increases and determining appropriate discharge plans.

Patient History [1:56]

The patient's medical history is crucial. A patient might report a history of elevated kidney function due to diabetes, with a known baseline creatinine level. This indicates CKD. Access to old lab results showing consistently high creatinine levels also suggests CKD. If a patient with known CKD presents with a creatinine level higher than their baseline, investigate potential causes of AKI and treat accordingly to return them to their baseline. If there is no clear medical history, continue with the next steps to determine the condition.

Identifying Potential Causes [3:03]

Look for obvious causes of kidney issues, categorizing them as prerenal, renal, or postrenal. Prerenal causes include hypovolemia from bleeding, vomiting, or diarrhea, and shock due to conditions like myocardial infarction. Renal causes may involve nephrotoxic medications or contrast dye from imaging. Postrenal causes include prostate issues causing urinary obstruction or kidney stones. A recent history of such issues suggests AKI, while a long-standing history of conditions like diabetes or hypertension points towards CKD.

Ultrasound Findings [4:25]

Perform a renal ultrasound to assess kidney size. Smaller kidneys typically indicate CKD, while normal or enlarged kidneys suggest AKI. Exceptions exist in CKD, where kidney size may be normal or large in conditions like polycystic kidney disease or myeloma. Hydronephrosis, indicative of obstruction, can also be identified via ultrasound.

Urine Output [5:27]

Reduced urine output (oliguria) often suggests AKI. In CKD, the kidneys adapt to declining function, maintaining normal urine output. Patients with CKD may experience nocturia (frequent nighttime urination) due to the kidneys' reduced ability to concentrate urine.

Trends in Creatinine Levels [6:20]

Monitor daily creatinine levels. A consistent daily increase suggests AKI. In CKD, creatinine levels tend to increase in a stepwise manner, with periods of stability followed by further increases.

Anemia [7:00]

Normal hemoglobin levels suggest AKI, as anemia typically doesn't develop quickly in acute conditions unless there's another cause. Low hemoglobin levels are more indicative of CKD due to decreased erythropoietin production.

Parathyroid Hormone (PTH) [7:36]

Normal PTH levels suggest AKI, while elevated PTH levels are more common in CKD due to decreased calcium levels and secondary hyperparathyroidism.

Calcium and Phosphate Levels [8:09]

Normal calcium levels suggest AKI. Low calcium and severely elevated phosphate levels are more indicative of CKD. While phosphate can also be elevated in AKI, severe hyperphosphatemia is more characteristic of CKD.

Potassium Levels [8:36]

Elevated potassium levels (hyperkalemia) often suggest AKI, as the kidneys struggle to regulate potassium excretion. Normal potassium levels are more common in CKD until later stages (stage 4 or 5), as the kidneys compensate to maintain potassium balance despite declining GFR.

Proteinuria [9:20]

Low levels of protein in the urine typically suggest AKI, whereas high levels of protein in the urine are typically found in CKD.

Severity of Symptoms [9:36]

Patients with AKI often experience more severe symptoms like edema, nausea, and vomiting because their bodies haven't adjusted to the rapid decline in kidney function. Patients with CKD may have milder symptoms like fatigue or itching, as their bodies gradually adapt to the worsening kidney function.

Bone Disease [10:25]

Evidence of bone disease on X-ray suggests CKD, while normal bone structure is more typical of AKI, as bone changes take time to develop.

Case Examples and Conclusion [10:49]

The video concludes with case examples illustrating how to integrate the discussed factors to differentiate between AKI and CKD. One example describes a patient with a history of diabetes, normal kidney size on ultrasound, anemia, elevated PTH, low calcium, and significant proteinuria, pointing towards CKD. The other example describes a patient with no prior history, normal kidney size, normal PTH and calcium, low urine output, rising potassium and creatinine levels, and a history of nephrotoxic drug use, suggesting AKI. The speaker encourages viewers to subscribe for future detailed discussions on AKI and CKD.