Significance of Abnormal Laboratory Results in Mr. Akana’s Case: A Comprehensive Analysis

QUESTION

Keola Akana is a 70-year-old male with a history of heart failure. He was admitted to the
medical-surgical unit on Monday for medication adjustment, monitoring, and cardiac
Keola Akana is a 70-year-old male with a history of heart failure. He was admitted to the
medical-surgical unit on Monday for medication adjustment, monitoring, and cardiac rehabilitation. On Thursday at 1400, Mr. Akana experiences confusion, decreased urinary output,
and elevated blood urea nitrogen, creatinine, and potassium values. The client is sitting in bed
with head of bed at 45 degrees and 3 pillows behind his back and head. He is complaining of
difficulty breathing and is intermittently confused. Urine output has been below 30 mL per hour
for the past 16 hours, and labs have just returned indicating elevated blood urea nitrogen (BUN),
creatinine, and potassium. 3+ pitting edema is present in his legs, and lung sounds are coarse. His
wife Zoe is in the room. She is supportive and patient.
Past Medical History
• Hypertension
• High cholesterol
• Congestive heart failure
Physical examination findings
Vital signs: BP 154/92 mmHg, Pulse 98/min irregular, RR 30/min and laboured, SaO2 91% on
3L O2 via nasal cannula, Temp 36.9 0C3Scenario adopted from Elsevier-modified & edited by Nazool Alli
Respiratory
• developed shortness of breath at rest
• use of accessory muscles.
• Chest with bibasilar coarse crackles on auscultation
Cardiac
• heart sounds irregular
Neurological
• Confused
• Keola asks, “Where am I? Who are you?”
Abdomen
• no abdominal distention
• bowel sounds present
Neck
• distended neck veins
• JVD with jugular venous pressure >4cm
• no bruits noted on auscultation
Extremities
• 2+ bilateral pre-tibial pitting edema and also in feet and ankles
• Palpable pedal pulses
Integumentary
• Pale, cool and clammy
• Slightly diaphoretic4Scenario adopted from Elsevier-modified & edited by Nazool Alli
Laboratory Results
Tests Results Normal value
Red blood cell count 4.9 million/mm3 4.4 – 5.7 X 1012/L
White blood cell count 11.0 × 109 /L 4.0-10.0 × 109 /L
Troponin <0.01 μg/L < 0.01 μg/L
B-type natriuretic peptide
(BNP).
>400 pg/ml
HF very likely
<100 pg/ml
sodium 132 mmol/L 135-145 mmol/L
potassium 6.0 mmol/L 3.5-5.0 mmol/L
Blood urea nitrogen (BUN) 10.0 mmol/L 2.5 – 8.0 mmol/L
Serum Creatinine 700 μmol/L 70 – 120 μmol/L
eGFR <60
mL/min/1.73m2
> 90 mL/min/1.73m2
**HF= Heart Failure
Arterial blood Gas (ABG)
Results Normal value
pH 7.32 7.35- 7.45
PaCO2 31 35- 45 mmHg
HCO3- 12 21- 28
PaO2 70 80- 100 mmHg
Urinalysis
• fixed specific gravity of 1.010
• cell casts present.
Diagnosis
Mr. Akana was diagnosed with acute kidney injury (AKI) based on his clinical presentation. The
following were ordered by the physician to manage Mr. Akana acute kidney injury:
• Furosemide 40 mg IV x 1 now
• Sodium polystyrene sulfonate 15 grams oral elixir x 1 now
• 12-lead ECG STAT

what quesition is

What is the significance of the abnormal laboratory results? Explain each in detail.
Include in your discussion, which laboratory finding(s) would be your priority to address
and why.

ANSWER

Significance of Abnormal Laboratory Results in Mr. Akana’s Case: A Comprehensive Analysis

Introduction

Mr. Keola Akana, a 70-year-old male with a history of heart failure, presents with acute kidney injury (AKI) along with a constellation of clinical and laboratory findings. This essay aims to explore the significance of the abnormal laboratory results in Mr. Akana’s case, detailing each finding and prioritizing the laboratory findings for immediate attention.

Abnormal Laboratory Results and Their Significance

Sodium (Na+):The sodium level of 132 mmol/L is below the normal range (135-145 mmol/L). This hyponatremia is likely due to fluid retention, a common complication of heart failure. It could worsen heart failure symptoms and indicate the severity of fluid imbalance.

Potassium (K+): An elevated potassium level of 6.0 mmol/L (normal range: 3.5-5.0 mmol/L) is concerning, as hyperkalemia can lead to life-threatening arrhythmias, especially in patients with heart failure. Elevated potassium levels can also result from impaired kidney function.

Blood Urea Nitrogen (BUN) and Serum Creatinine: Elevated BUN (10.0 mmol/L, normal: 2.5-8.0 mmol/L) and serum creatinine (700 μmol/L, normal: 70-120 μmol/L) indicate impaired kidney function. These findings support the diagnosis of acute kidney injury (AKI), likely due to decreased renal perfusion secondary to heart failure.

eGFR: The decreased estimated glomerular filtration rate (eGFR) (<60 mL/min/1.73m²) reflects compromised kidney function and supports the diagnosis of AKI. It signifies reduced filtration ability, contributing to the accumulation of waste products and electrolyte imbalances.

Arterial Blood Gas (ABG): The ABG reveals a low pH (7.32, normal: 7.35-7.45) and low bicarbonate (HCO3-) level (12, normal: 21-28 mmol/L). These findings indicate metabolic acidosis, likely resulting from impaired kidney function. Metabolic acidosis further worsens heart failure and can lead to adverse cardiac events.

B-type Natriuretic Peptide (BNP): The elevated BNP (>400 pg/ml) strongly suggests heart failure exacerbation. BNP is released in response to ventricular stretch, reflecting the severity of heart failure and the need for prompt intervention.

Urinalysis: The fixed specific gravity of 1.010, along with the presence of cell casts, indicates impaired tubular function and supports the diagnosis of AKI.

Priority Laboratory Findings and Interventions

Given the severity of Mr. Akana’s condition, the priority laboratory findings to address are:

Potassium (K+): Hyperkalemia poses an immediate threat of arrhythmias. Timely measures such as administration of Kayexalate or insulin-glucose therapy to shift potassium intracellularly should be initiated.

BUN and Serum Creatinine: Elevated BUN and creatinine indicate compromised renal function. Early intervention includes fluid and electrolyte management, along with close monitoring of medication dosages cleared by the kidneys.

Arterial Blood Gas (ABG): Metabolic acidosis requires correction to optimize cardiac function. Sodium bicarbonate infusion might be necessary.

Conclusion

The abnormal laboratory results in Mr. Akana’s case carry significant implications for his heart failure and acute kidney injury. Hyponatremia, hyperkalemia, elevated BUN, creatinine, and BNP, along with metabolic acidosis, indicate the severity of his condition. Prioritizing the management of hyperkalemia, impaired renal function, and metabolic acidosis can mitigate potential life-threatening complications and enhance his overall prognosis. It is imperative for healthcare providers to promptly address these laboratory findings and implement appropriate interventions to optimize Mr. Akana’s health and well-being.