Cholera is the master class in “dehydration is the priority.” No fancy tricks, just one very simple lesson: replace the fluid, fast. It’s a favorite for exam writers because nearly every answer points back to fluids and electrolytes. Here are my notes, and then a practice test to see if you remember them.
Table of Contents
What is Cholera?
Cholera is an acute diarrheal infection caused by the bacterium Vibrio cholerae, a curved gram-negative bacillus. It spreads by drinking water or eating food contaminated with the bacteria.
- Spread by the fecal–oral route (contaminated water, raw or undercooked seafood, and food).
- Outbreaks happen after floods, disasters, and in crowded places with poor sanitation.
- Causes sudden, profuse painless watery diarrhea.
- Watch Out For: severe dehydration, hypovolemic shock, hypokalemia, metabolic acidosis.
- Safety Precaution: Standard precautions, plus contact precautions if the client is incontinent.
Pathophysiology
The bacteria survive stomach acid, attach to the small intestine, and release cholera toxin. The toxin makes the intestinal cells pour out chloride and water, so large amounts of fluid are lost. The intestine isn’t damaged much, which is why the diarrhea is painless and there is little blood or inflammation.
- Fluid loss can reach liters per hour in severe cases.
- Lost along with the fluid: sodium, potassium, and bicarbonate.
Assessment and Diagnostic Findings
Clinical presentation: Sudden watery diarrhea that looks like “rice-water” stools (cloudy, pale gray, with flecks of mucus), vomiting, and leg cramps. Fever is usually absent.
Physical exam: Signs of dehydration, including sunken eyes, dry mucous membranes, poor skin turgor, thirst, tachycardia, low blood pressure, decreased urine output, and in severe cases, weak pulse and altered level of consciousness.
Laboratory findings
- Stool culture confirms the diagnosis. Rapid tests are also available in the field.
- Electrolytes: low potassium, and metabolic acidosis (low bicarbonate).
NCLEX Tip: Painless “rice-water” diarrhea means cholera. Rehydration is the priority.
Medical Management
- Rehydration is the cornerstone: oral rehydration solution (ORS) for mild to moderate dehydration, and IV fluids (such as lactated Ringer’s) for severe dehydration or shock.
- Antibiotics (for example, doxycycline or azithromycin) shorten the illness and cut down fluid loss. They are not a replacement for fluids.
- Potassium replacement as needed.
- Prevention: safe water, sanitation, and the oral cholera vaccine in high-risk areas.
- AVOID: relying on antibiotics alone, and delaying fluid replacement.
Nursing Management
Nursing care focuses on fluid replacement, electrolyte monitoring, infection control, and education.
- MONITOR: vital signs, level of consciousness, skin turgor, mucous membranes, urine output, daily weight, and strict intake and output.
- Hydration: Start ORS or IV fluids as ordered and measure stool output so replacement can match losses.
- Electrolytes: Watch for hypokalemia (muscle weakness, cramps, irregular heartbeat) and report abnormal results.
- Infection control: Handwashing with soap and water, careful disposal of stool and vomit, and cleaning of soiled linen and surfaces.
- Education: Drink boiled or treated water, cook seafood well, wash hands before eating and after using the toilet, and give ORS early at home when diarrhea starts.
NCLEX High-Yield Notes
- Rice-water stools and painless profuse diarrhea.
- Fluid volume deficit is the priority problem.
- ORS for mild to moderate, IV fluids for severe.
- Watch for hypokalemia and metabolic acidosis.
- Antibiotics are supportive to rehydration, not a substitute.
Mnemonic (RICE-WATER):
- Rehydrate first
- IV fluids if severe
- Cramps in legs (low potassium)
- Electrolytes, check them
- Watery stools, painless
- Antibiotics shorten illness
- Take clean, safe water
- Educate on handwashing
- Report signs of shock
