Heatstroke

Heatstroke is the failure of heat-regulating mechanisms within the body. There are two main types of heatstroke: exertional heatstroke occurs in healthy individuals who engage in exercise in extreme heat; hyperthermia occurs due to inadequate heat loss. The signs and symptoms (S/S) of heatstroke include:

  • Anhidrosis (the inability to sweat)
  • Tachycardia (increased heart rate)
  • Tachypnea (increased respiratory rate)
  • Blood pressure ranging from normal to low
  • Red, flushed skin
  • Fever

Treatment (TX) for Heatstroke

  • Ice packs applied to the groin, back of the neck, and under the armpits.
  • Cool intravenous (IV) fluids.
  • Cooling blankets.
  • Ice lavage (ice water in nasogastric (NG) tube).
  • Antipyretics (fever-reducing medications).
  • Temperature monitoring via Foley catheter and/or esophageal monitoring.

Malignant Hyperthermia

Malignant hyperthermia is a severe, potentially fatal reaction to certain anesthetics. This reaction stems from a rare, inherited muscle abnormality and is usually triggered by anesthesia but can also be infrequently incited by extreme exercise or heatstroke. It typically occurs in patients under 30 years of age and is commonly caused by the anesthetic succinylcholine.

Signs and Symptoms

  • High fever
  • Low heart rate
  • Low blood pressure
  • Elevated lactic acid levels
  • Low urine output, which may appear teal or cola colored, usually associated with metabolic acidosis
  • Muscle rigidity
Complications
  • Monitor for hyperkalemia (elevated potassium levels)
  • Fever can reach as high as 113°F.

Treatment Options

  • Dantrolene (a skeletal muscle relaxant)
  • IV fluids (Lactated Ringer's solution to help eliminate lactate)
  • Temperature management through cooling techniques (ice packs, ice lavage, cooling blankets)
  • Treatment for hyperkalemia utilizing calcium gluconate, insulin, and D5 (5% dextrose)
  • Sodium bicarbonate if the patient is in metabolic acidosis.

Hypothermia

Hypothermia occurs when body temperature drops below 35°C (95°F).

Signs and Symptoms

  • Shivering
  • Impaired perfusion
  • Decreased blood pressure and heart rate
  • Decreased respiratory rate
Treatment Options
  • Demerol (meperidine) is used to control shivering.
  • An established hypothermia protocol mandates therapeutic hypothermia following a witnessed cardiac arrest.
  • Maintain temperatures between 32°C - 36°C (89.6°F - 96.8°F) for 12 hours, followed by a gradual rewarming over another 12 hours.

Complications

  • Persistent low blood pressure, high heart rate, and high respiratory rate if not intubated.

Disseminated Intravascular Coagulation (DIC)

DIC involves widespread clotting followed by severe bleeding as clotting factors (such as factor VIII) are depleted.

Causes

  • Sepsis
  • Trauma
  • Cancer
  • Hemorrhage
  • Toxins

Signs and Symptoms

  • Widespread bleeding (e.g., from the nose, wounds, IV sites)
  • Decreased blood pressure
  • Increased heart rate
  • Decreased platelet count
  • Elevated D-dimer
  • Elevated INR/PTT
  • Decreased perfusion
Treatment
  • Potassium replacement, and blood products including plasma, platelets, and whole blood.

Stroke

Strokes can either be ischemic (where blood flow to the brain is blocked) or hemorrhagic (when a vessel bursts), both leading to rapid brain cell death.

Ischemic Stroke

  • Caused by blockages such as blood clots or plaque buildup.
Signs and Symptoms
  • Facial drooping
  • Weakness
  • Slurred speech
  • Confusion
Diagnostic Tests and Treatment
  • CT scan to confirm the stroke type.
  • Administration of tissue Plasminogen Activator (TPA) (clot buster), with specific criteria:
    • Patient must be at least 18 years old.
    • Platelet count must be greater than 150,000.
    • A confirmed diagnosis of ischemic stroke.
    • No evidence of intracranial hemorrhage.
    • Symptoms were last known normal within 3 hours of onset.
    • No recent surgical procedures or anticoagulant use.

Transient Ischemic Attack (TIA)

Also referred to as a "mini-stroke," it resolves on its own without lasting effects.

Hemorrhagic Stroke

Signs and Symptoms
  • Symptoms resemble those of ischemic stroke.
  • Causes include hypertension (high blood pressure), intracranial pressure (ICP) increase, trauma, vomiting, aneurysms, and seizures.
  • Severe headache, unequal pupils.
Treatment
  • CT scan for diagnosis
  • Blood pressure management
  • Patients may exhibit hemiplegia (paralysis on one side), hemiparesis (weakness on one side), dysarthria (weakness in speaking or swallowing), and dysphasia with variations in expressive understanding of speech.

Gastric Bypass Surgery

Gastric bypass surgery is utilized for weight loss. Patients should not take calcium with Vitamin D as this may lead to malabsorption.

Signs and Symptoms Post-Operatively
  • Malnutrition due to malabsorption.
  • Calcium deficiency, requiring careful supplementation alongside iron.
  • Sugar intolerance can lead to dumping syndrome, where food moves too quickly from the stomach to the intestine.
  • The common signs of dumping syndrome are cramping, nausea, vomiting, diarrhea, sweating, and dizziness.
Management Post-Operatively
  • Clear liquid diet (with no sugar).
  • Patient education about dietary restrictions, especially avoiding NSAIDs due to the risk of GI bleeding.

HIV Life Cycle

The life cycle of HIV includes several stages:

  1. Attachment/binding
  2. Uncoating/fusion
  3. DNA synthesis
  4. Integration
  5. Transcription
  6. Translation
  7. Cleavage
  8. Budding

Stages of HIV Infection

  • Stage 1 (Acute stage): Time from infection until HIV antibody development, with T-cell counts generally around 500.
  • Stage 3: T-cell count between 200-499.
  • Stage 4: T-cell count less than 200, often leading to an AIDS diagnosis.

Clinical Manifestations of HIV

In the first stage, patients may be asymptomatic or present with fatigue and skin rash.

Later Stages

  • Respiratory manifestations include shortness of breath, dyspnea, cough, chest pain, pneumonia, and opportunistic infections like Mycobacterium avium complex and tuberculosis (TB).
  • Gastrointestinal symptoms include nausea, vomiting, diarrhea, loss of appetite, and oral candidiasis.
  • Wasting syndrome and various cancers such as Kaposi's sarcoma and lymphomas may occur.
  • Neurologically, effects may involve cognition, motor functions, and peripheral neuropathies. - Fungal infections like Cryptococcus neoformans and progressive multifocal leukoencephalopathy may also be seen.
  • Dermatological manifestations may include herpes zoster and seborrheic dermatitis.
  • Gynecological issues may involve persistent and recurrent vaginal candidiasis, pelvic inflammatory disease, and menstrual abnormalities.

Assessment of the Patient with Sickle Cell Disease

  • A complete health history and physical exam should be conducted, with a focus on pain assessment.
  • Laboratory data is necessary, particularly for the presence of S-shaped hemoglobin.
  • Symptom presence and impact on the patient’s life must be noted, emphasizing symptoms such as swelling, fever, and pain.
  • Sickle cell crisis assessment involves evaluating blood loss, cardiovascular status, and neurological function.

Collaborative Problems and Potential Complications of Sickle Cell Disease

  • Chronic complications may include hypoxia, ischemia, infection, dehydration, cerebral vasculature accidents (CVA), anemia, acute and chronic kidney disease, heart failure, impotence, and poor medication compliance.

Interventions for Patients with Sickle Cell Disease

  • Pain management is vital.
  • Strategies to manage fatigue should be implemented.
  • Infection prevention must be prioritized.
  • Education on the disease process is crucial, alongside monitoring for complications.