10 results
Modified Hyponatremia Algorithm
Hypertonic Hyponatremia: Hyperglycemia, Mannitol, Urologic irrigants
Hypotonic Hyponatremia: 
 • ADH ON (UOsm > 100):
Algorithm Hypertonic ... OFF (UNa > 30): SIADH ... 100): Primary polydipsia ... , Low solute intake ... #sodium #nephrology
Volume Based Approach to Hyponatremia
Hypovolemic, Serum uric acid >4
 • Urine Na <20: Extra-renal losses
 •
uric acid <4 • SIADH ... Hypothyroidism, Low ... deficiency, Primary polydipsia ... #algorithm #diagnosis ... #sodium #low #nephrology
Hyponatremia Differential Diagnosis Algorithm - Utilizing Uric Acid 
ADH promotes Urea/uric acid excretion along with water
Hyponatremia Differential ... Diagnosis Algorithm ... Uric Acid → SIADH ... #nephrology #sodium ... #low #uricacid
Hyponatremia Diagnosis Algorithm
UOsm ≥ POsm - Vasopressin-Dependent
 • UNa < 20 mEq/L - Appropriate (↓ EABV)
Algorithm UOsm ... Inappropriate - Consider: SIADH ... Consider: Primary polydipsia ... , Low solute intake ... #causes #nephrology
Hypernatremia Diagnosis and Workup

Step 1 . Repeat the sodium concentration.
Step 2.  Check plasma osmolality.
NORMAL PLASMA
Repeat the sodium ... EUVOLEMIC • SIADH ... • psychogenic polydipsia ... Diagnosis #Workup #Algorithm ... #Nephrology
Hyponatremia - Differential Diagnosis Algorithm
ADH Independent:
 • Tea and Toast Syndrome, Beer Potomania - Low solute
Diagnosis Algorithm ... Beer Potomania - Low ... • Psychogenic Polydipsia ... insufficiency, SIADH ... #causes #nephrology
Physiologic Approach to Hypotonic Hyponatremia
The next time you have a case of hypotonic hyponatremia, give the
normal volume-based algorithm ... , Renal Sodium loss ... can be high or low ... intake (Primary polydipsia ... #nephrology
Hyponatremia - Differential Diagnosis Algorithm
Hypovolemic - Give volume
Hypervolemic (Edematous) - Look for and treat underlying cause
Diagnosis Algorithm ... - Primary Polydipsia ... , SSRIs) - SIADH ... #diagnosis #nephrology ... #sodium
Hyponatremia - Differential Algorithm
Isotonic Hyponatremia: Hyperlipidemia, Hyperproteinemia, Recent TURP
Hypotonic Hyponatremia: 
 • Hypovolemia: Diuretics/Nephropathies, Vomiting, Diarrhea,
Algorithm Isotonic ... • Euvolemia: SIADH ... Potomania, Psychogenic polydipsia ... diagnosis #causes #nephrology ... #sodium #low
Primary Polydipsia
Definition: Excessive volitional water intake
Epidemiology:
 • 6-20% of patients with psychiatric disorders - Most commonly
• Symptomatic hyponatremia ... hypothalamic thirst center ... Pseudohyponatremia, SIADH ... , Urine Sodium ... diagnosis #management #nephrology