CASE STUDY
ON
POTASSIUM IMBALANCE
In partial fulfillment of requirements for NCM 109
Care of Mother and Child at Risk or with Problems (Acute and Chronic)
March 2025
INTRODUCTION
Potassium imbalance refers to a condition where the potassium level in the blood is
either too low or too high. Potassium an essential mineral needed for all bodily functions,
including nerve signaling, muscle contraction, and maintaining a healthy heart rhythm. It
also facilitates in the movement of nutrients and waste throughout your cells. When the level
of potassium in the blood deviates from the normal range, it can lead to a condition known
as potassium imbalance. The normal serum potassium concentration ranges from 3.5 to 5.0
mEq/L (Singh, 2024).
Hypokalemia occurs when the level of potassium in the blood is less than 3.5 mEq/L.
It can occur in people for a variety of reasons, including diarrhea and vomiting, diabetic
acidosis, renal failure, high sodium diet, and treatment-related complications. These
situations can cause potassium loss from the body, reduced potassium intake or absorption,
or shifts of potassium from the extracellular fluid into the cells that leads to a risk of
electrolyte imbalance (Vera, 2024).
Hyperkalemia occurs when the amount of potassium in the blood exceeds 5.0 mEq/L.
It occurs in patients with renal disease due to the kidneys’ reduced ability to excrete
potassium, as well as in patients who have received significant blood transfusions due to
potassium release from stored blood cells (Vera, 2024).
CAUSES
Hypokalemia
Hypokalemia can be caused by:
 Medications, such as diuretics, corticosteroids, or certain antibiotics
 Inadequate intake (poor diet or fasting)
 Shift of potassium into cells (excessive insulin administration or metabolic alkalosis)
 Loss of potassium through the kidneys (kidney disease or certain medications)
 Excessive fluid intake as it can dilute potassium levels
Hyperkalemia
Hyperkalemia can be caused by:
 Kidney disease (impaired kidney function can lead to potassium buildup)
 Medications, like use of potassium-sparing diuretics or ACE inhibitors
 Excessive potassium intake (overuse of potassium supplements or high-potassium
diet)
 Shift of potassium out of cells (acidosis, tissue damage, or certain medical conditions)
 Medications that affects potassium levels, such as beta-blockers and NSAIDs.
SIGNS AND SYMPTOMS
Hypokalemia

Muscle weakness, cramps, or twitching





Fatigue
Irregular heart beat
Constipation
Loss of appetite
Confusion or irritability
Hyperkalemia
 Muscle weakness
 Irregular heart rhythm
 Nausea and vomiting
 Numbness or tingling on the hands and feet
 Difficulty breathing
ANATOMY
 Heart – Hypokalemia may lead to palpitations, arrhythmias especially in people with
heart disease, and an increased risk of cardiac arrest, while hyperkalemia can cause
irregular heartbeats (arrhythmias), slow heart rate (bradycardia), or even cardiac
arrest.
 Muscles – Both hyperkalemia and hypokalemia can cause muscle weakness, cramps,
spasms, and, in severe cases, paralysis.
 Nervous System – Hypokalemia may cause confusion, fatigue, dizziness, and in rare
cases, hallucinations, whereas hyperkalemia can result in numbness, tingling, or even
neurological impairment in severe cases.
 Kidneys - The kidneys regulate potassium levels, so if they’re damaged, potassium
imbalance becomes more likely. Hypokalemia can occur due to excess potassium loss
from diuretics or vomiting, while hyperkalemia can indicate that the kidneys aren’t
excreting potassium properly.
 Digestive System – Hypokalemia can lead to constipation and bloating due to weakened
intestinal muscles, while hyperkalemia may cause nausea, vomiting, and abdominal
pain.
PATHOPHYSIOLOGY
DRUG STUDY
Hypokalemia
Drug
Name
Potassium
Chloride
Mechanism of
Action
Potassium
supplements
are essential for
nerve impulse
transmission,
muscle
contraction, and
maintaining
intracellular
tonicity.
Indications
Contraindications
Side Effects
Treatment
and
prevention of
hypokalemia.
Patients with
hyperkalemia, renal
failure, systemic
acidosis, dehydration,
extensive tissue
breakdown, adrenal
insufficiency, or
concurrent use of
potassium-sparing
diuretics.
Nausea,
vomiting,
flatulence,
abdominal
pain, diarrhea,
hyperkalemia.
Indications
Contraindications
Side Effects
Severe
hyperkalemia
with ECG
changes.
Patients with
hypercalcemia,
digitalis toxicity,
ventricular
fibrillation.
Hypotension,
bradycardia,
syncope.
Acute
hyperkalemia.
Hypoglycemia,
insulinoma.
Hypoglycemia,
hypokalemia.
Nursing
Considerations
 Monitor serum
potassium
levels
 Administer oral
forms with
food or a full
glass of water
to minimize
gastrointestinal
irritation
 Avoid rapid
intravenous
administration
to prevent
cardiac
complications
 Monitor for
signs of
hyperkalemia.
Hyperkalemia
Drug
Name
Calcium
Gluconate
Mechanism of
Action
Stabilizes
cardiac
membranes by
antagonizing the
effects of
hyperkalemia on
the heart,
reducing the risk
of arrhythmias.
Insulin
with
Dextrose
Insulin
facilitates
glucose uptake,
driving
potassium into
cells and
lowering serum
Nursing
Considerations
 Administer
intravenously
with
continuous
cardiac
monitoring
 Monitor
serum calcium
levels
 Observe for
signs of
hypercalcemia
 Monitor blood
glucose levels
closely
 Ensure
dextrose is
administered
levels, while
dextrose
prevents
insulin-induced
hypoglycemia.
Sodium
Polystyrene
Sulfonate
A cationexchange resin
that removes
potassium by
binding it in the
gastrointestinal
tract.

Hyperkalemia.
Hypokalemia,
obstructive bowel
disease, neonates with
reduced gut motility.
Constipation,
hypokalemia,
hypocalcemia,
sodium
retention.




Beta-2
Agonists
(e.g.,
Albuterol)
Activate beta-2
adrenergic
receptors to
drive potassium
into cells,
lowering serum
potassium
levels.
Acute
hyperkalemia.
Tachyarrhythmias,
hypersensitivity to
beta-agonists.
Tachycardia,
tremors,
palpitations.



to prevent
hypoglycemia
Monitor
serum
potassium
levels
Monitor
bowel
function
Assess serum
electrolytes
regularly
Avoid use in
patients with
bowel
obstruction
Consider
potential
sodium load
in patients
with heart
failure or
hypertension
Monitor heart
rate and
rhythm
Use with
caution in
patients with
cardiac
disease
Monitor
serum
potassium
levels
LABORATORY TESTS
Hypokalemia
Hypokalemia is diagnosed through a series of laboratory tests to monitor potassium
levels and determine the underlying cause. The following laboratory tests are indicated in
patients with hypokalemia:
1. Serum Potassium Level (Primary Test) - It confirms low potassium levels in the blood.
2. Serum electrolyte tests - Assess for associated electrolyte imbalances, which can affect
treatment. It also detects other electrolyte imbalances that may be associated with
hypokalemia.
3. Blood gas analysis - Assess acid-base status, which can influence potassium levels.
Alkalosis can cause hypokalemia, and treating acidosis may worsen pre-existing
hypokalemia.
4. Drug screen (serum or urine) - Drugs such as amphetamines and other
sympathomimetic stimulants, as well as verapamil (with overdose), theophylline,
amphotericin B, aminoglycosides, and cisplatin, may cause hypokalemia.
5. Serum adrenocorticotropic hormone (ACTH), cortisol, renin activity, and
aldosterone tests - Evaluate for suspected Cushing, Conn, or adrenal hyperplasia
syndromes, including 11-beta-hydroxylase deficiency.
6. Simultaneous serum insulin and C-peptide tests - As hyperinsulinism can result in
temporary hypokalemia, elevated serum insulin without appropriately elevated Cpeptide indicates exogenous insulin delivery, which may represent factitious disease
caused by another person (Munchausen by proxy).
Hyperkalemia
Laboratory studies depend on the etiology of hyperkalemia but may include the following:
1. Serum Potassium Level (Primary Test) – It confirms elevated potassium levels in the
blood.
2. Serum electrolyte tests – It identifies electrolyte imbalances related to hyperkalemia.
3. Arterial Blood Gas Analysis - Determines acid-base imbalances affecting potassium
levels.
4. Serum blood urea nitrogen (BUN) and creatinine tests - Assesses kidney function,
which regulates potassium excretion.
5. Urinalysis (UA) - Differentiates between kidney-related and non-kidney-related causes.
IMAGING STUDIES
Hypokalemia
1.
Magnetic resonance imaging - Perform brain magnetic resonance imaging (MRI) if
a brain or pituitary tumor is suspected as a cause of hypercortisolism.
2.
Ultrasonography and computed tomography scanning - Perform abdominal
ultrasonography or computed tomography (CT) scanning if an adrenal tumor or hyperplasia
is suspected.
3.
Electrocardiography - Although electrocardiographic changes can be useful when
present, their absence should not be interpreted as confirmation of normal cardiac
conduction. The electrocardiogram (ECG) with hypokalemia may appear normal or have
only minor abnormalities prior to clinically severe dysrhythmias.
Electrocardiographic findings may include the following:
•
•
•
•
•
Ventricular dysrhythmia
Prolongation of QT interval
ST-segment depression
T-wave flattening
Appearance of U waves
SURGICAL PROCEDURES
Hypokalemia
Generally, hypokalemia is a medical problem rather than a surgical one. Surgical
intervention is only required for particular etiologies, such as the following:
1. Renal artery stenosis - Narrowing of the renal artery reduces kidney blood flow,
activating RAAS and causing hypokalemia, therefore, revascularization procedures, such
as angioplasty or surgical bypass, may be performed to restore adequate blood flow to
the affected kidney.
2. Adrenal adenoma - An adrenal adenoma can cause primary hyperaldosteronism,
leading to excess aldosterone, increased potassium excretion, that results in
hypokalemia, therefore, adrenalectomy, a surgical removal of the affected adrenal gland,
is the treatment of choice.
3. Intestinal obstruction producing massive vomiting - Severe vomiting from intestinal
obstruction can cause significant potassium loss and hypokalemia, therefore, surgery is
needed to correct the obstruction and prevent further depletion.
4. Villous adenoma - Villous adenomas in the colon can secrete potassium-rich mucus,
causing hypokalemia, therefore, polypectomy or segmental resection of the affected is
performed to remove the adenoma.
Hyperkalemia
1. Tumor Debulking Surgery: For high-risk solid tumors prone to tumor lysis syndrome
and hyperkalemia, tumor debulking may be performed to reduce tumor burden and
metabolic complications.
2. Dialysis Access Placement: For severe hyperkalemia from kidney failure unresponsive
to treatment, a hemodia lysis catheter may be surgically placed for urgent dialysis.
MANAGEMENT
Independent Nursing Interventions:
1. Monitor Vital Signs – Assess heart rate, blood pressure, and respiratory status
regularly to detect early signs of cardiac instability associated with potassium
imbalance.
2. Assess for Symptoms – Observe for symptoms such as muscle weakness, fatigue,
cramps, arrhythmias, and decreased bowel motility, which are common in potassium
imbalances.
3. Encourage Balanced Diet –
For hypokalemia: Encourage consumption of potassium-rich foods such as bananas,
oranges, spinach, and potatoes.
For hyperkalemia: Recommend reducing the intake of high-potassium foods and
avoiding salt substitutes that contain potassium.
4. Monitor Fluid Balance – Monitor and record intake and output to identify potential
fluid imbalances affecting potassium levels.
5. Implement Safety Measures – Implement fall precautions due to muscle weakness
and monitor for potential arrhythmias.
6. Promote Adequate Hydration – Encourage adequate fluid intake to help maintain
electrolyte balance.
7. Educate on Medication Compliance - Instruct caregivers and children on the
importance of following prescribed potassium supplements and medications to
maintain appropriate potassium levels.
Dependent Nursing Interventions:
1. Administer Medications as Prescribed –
For hypokalemia: Administer oral or intravenous potassium supplements carefully,
ensuring proper dilution and infusion rates to prevent complications.
For hyperkalemia: Administer medications such as loop diuretics to promote
potassium excretion, or agents like sodium polystyrene sulfonate to facilitate
potassium removal.
2. Monitor Electrolyte Levels - Assess serum potassium and other electrolytes on a
regular basis to monitor the efficacy of treatment and identify any abnormalities.
3. Implement Cardiac Monitoring - Continuous cardiac monitoring is recommended
to detect dysrhythmias associated with potassium imbalances.
4. Administer Intravenous Therapies –
For hyperkalemia: Administer calcium gluconate to stabilize cardiac membranes, or
insulin with dextrose to facilitate intracellular potassium shift, as ordered.
5. Coordinate Care with Dietitians - Work with a nutritionist to establish a diet plan
that is appropriate for the child's potassium needs.
6. Review and Adjust Medications - Collaborate with the healthcare team to evaluate
current medications, identifying and modifying those that may contribute to
potassium loss, such as certain diuretics.
7. Prepare for Dialysis if Indicated (Hyperkalemia) - In severe cases of hyperkalemia
unresponsive to other treatments, assist in preparing the child for dialysis as ordered.
NURSING CARE PLAN
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