Approach to the Critical Patient

Immediate priorities

Airway and mental status threats

Hemodynamic assessment

Monitoring and targets

Monitoring bundle

Escalation triggers

Immediate consults

Consultation triggers

History

Presentation pattern

Core symptoms

Onset and chronicity

Timing classification

Risk factors

High-risk populations

Medical conditions

Medications

Causative medications

Physical Exam

Vitals and general appearance

Hemodynamic status

General appearance

Neurologic exam

Level of consciousness correlation

Focal findings

Hydration and volume status

Mucosal exam

Skin findings

Fontanelle in infants

Differential Diagnosis

Water deficit etiologies

Inadequate intake

Renal water losses

Extrarenal losses and iatrogenic causes

GI losses

Skin and respiratory losses

Iatrogenic sodium loading

Endocrine and rare causes

Adipsic hypernatremia

Primary hyperaldosteronism

Thyrotoxicosis

Laboratory Tests

Core electrolyte and osmolality panel

Serum sodium

Serum osmolality

BMP or CMP

Urine studies

Urine osmolality — key diagnostic discriminator

Urine sodium

Urine specific gravity

Additional laboratory evaluation

Serum calcium

Serum uric acid

Complete blood count

Arterial or venous blood gas

Diagnostic Tests

Scoring Systems

Severity classification system

Free water deficit calculation

ACEP guidance

MRI

Brain MRI indications

MRI findings in complications

CT

CT head indications in hypernatremia

CT findings

Ultrasound

Point of care ultrasound applications

Renal ultrasound

Disposition

Admission criteria

Inpatient admission indications

ICU and high-dependency criteria

ICU admission triggers

Step-down eligibility

Discharge criteria

Safe discharge conditions

Follow-up planning

Treatment

Initial resuscitation and volume restoration

Hemodynamically unstable patients

Free water deficit replacement

Fluid selection

Correction rate targets

Rate calculation and monitoring

Infusion rate calculation

Monitoring protocol

Diabetes insipidus-specific treatment

Central diabetes insipidus

Nephrogenic diabetes insipidus

Seizure and complication management

Acute seizure management

Cerebral edema from overcorrection

Special Populations

Pregnancy

Physiologic context

Management considerations

Geriatric

Physiologic vulnerabilities

Clinical approach

Pediatrics

Neonates and infants

Correction rate — infants

Pediatric diabetes insipidus

Background

Epidemiology

Prevalence and incidence

Risk population distribution

Pathophysiology

Osmolality and water regulation

Brain adaptation

Classification by volume status

Therapeutic Considerations

Evidence base for correction rate

Fluid strategy considerations

ICD-10 coding

Patient Discharge Instructions

copy discharge instructions

Discharge instructions for Hypernatremia

References

Guidelines and key sources

Primary references

Landmark studies

Additional sources

SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.