electrolyte disorders - nephrologyjeffkaufhold.com/wp-content/...disorders-and-cases.pdf · •...
TRANSCRIPT
Electrolyte Disorders
Dom Colao, DO November 2011
Jeff Kaufhold MD 2019
Review of Electrolyte disorders
• HypoNatremia • Hypernatremia • HypoKalemia • HyperKalemia • Calcium • Magnesium • Phosphorus
Overview of Disorders
• The differential for any lab abnormality: – Lab error
• Lab error – Lab error
– Polypharmacy – Iatrogenic – Real disease
• In that order!
Always consider the potential for a confounding variable
• Was the blood drawn above a running IV?
• Did it sit too long before the test was run?
• Is it your patients blood? • Is there a pattern of abnormalities in
numerous patients on the same day?
Over view of Sodium Disorders
• Pseudo-hyponatremia – Due to high concentrations of other solutes
in the blood - Mannitol in a pt with cerebral edema, Glucose in a diabetic.
• Then look at the patient’s volume status
• Hypervolemic/Euvolemic/Hypovolemic
Hyponatremia
• Hypervolemic:
• HypOvolemic:
• Euvolemic:
Hyponatremia
• Hypervolemic: – CHF, – Cirrhosis, – Pregnancy, – Nephrotic syndrome – In these conditions, total body sodium is up, but
total body WATER is up even more. – Due to reduced Effective Arterial Blood Volume,
(EABV) leading to increased ADH secretion.
Hyponatremia
• Hypervolemic: – CHF, Cirrhosis, Pregnancy, Nephrotic syndrome
• HypOvolemic: – GI losses (diarrhea, Vomiting, NG suction) – Renal Losses (diuretics, Salt wasting nephropathy,
recovery phase from ATN or obstruction). – Due to true depletion of water and sodium, leading
to increased secretion of Aldosterone AND ADH
Hyponatremia
• Hypervolemic: – CHF, Cirrhosis, Pregnancy, Nephrotic syndrome
• HypOvolemic: – GI losses (diarrhea, Vomiting, NG suction) – Renal Losses (diuretics, Salt wasting nephropathy,
recovery phase from ATN or obstruction). • Euvolemic:
– Medication effects, Endocrine syndromes, Excessive water intake, reset osmostat, SIADH
Hyponatremia • Euvolemic:
– Medication effects • ACE/ ARB/Tekturna/Spironolactone/HCTZ • Antidepressant and antipsychotic meds • NSAID’s
– Endocrine syndromes • Hyper and Hypo thyroid, • Adrenal insufficiency and excess (addison’s / Cushings)
– Excessive water intake, • Psychogenic polydipsia, beer potomania
– reset osmostat, • Seen in conditions which stimulate tonic ADH secretion from
tissues which have Neuroectoderm (brain and Lung) – SIADH
Hyponatremia • Euvolemic:
– reset osmostat, • Seen in conditions which stimulate tonic ADH secretion from
tissues which have Neuroectoderm (brain and Lung) • Pneumonia, COPD, stroke, brain hemorrhage. • These conditions result in a stable low level of sodium, around
which water and sodium regulation are functioning normally, but at a new lower setting.
• Confirmed by water loading test. – SIADH - Persistant high production of ADH which does not
suppress in the face of water load, usually due to a tumor such as small cell lung carcinoma or brain tumor.
Case 1, Hyponatremia �6 �0 � �y �. �o �. � �m �a �l �e � �a �l �c �o �h �o �l �i �c � �p �r �e �s �e �n �t �s � �t �o � �E �R � �w �i �t �h � �c �e �l �l �u �l �i �t �i �s �, � � �w �a �l �k �i �n �g � �a �n �d � �t �a �l �k �i �n �g �. � �E �x �a �m � �s �h �o �w �s � BP 104/50, pulse 90, Temp 98, with �s �i �g �n �s � �o �f � �p �o �r �t �a �l � �h �y �p �e �r �t �e �n �s �i �o �n � � �a �n �d � �3 �+ � �p �r �e �t �i �b �i �a �l � �e�d�e�m�a�.� � F �o �u �n �d � �o �n � �r �o �u �t �i �n �e � �l �a �b �s � �t �o � �h �a �v �e � �s �e �r �u �m � �s �o �d �i �u �m � �1 �1 �8 � �m�E�q�/�L�.� �C�L�A�S�S�I�F�I�C�A�T�I�O�N� �O�F� �S�O�D�I�U�M� �D�I�S�O�R�D�E�R�S�: Hypo? Hyper? Euvolemic? �A�D�H� �L�E�V�E�L� �=� �H�I�/�L�O�/�N�O�R�M�?� � �W�H�Y�?� � � � � T�r�e�a�t�m�e�n�t�?�
Case 1b Hyponatremia 60 y.o. female with COPD brought to ER with pneumonia and severe SOB. Exam shows her BP is 150/80, Pulse 110, Resp 40. Breathing is labored, wheezing, no edema. Initial resuscitation with Normal Saline, B-agonist resp treatments and intubation improves her breathing, but she then has a seizure. Lytes on admission show her sodium is 126, CLASSIFICATION? After the seizure her sodium is 118 mg/dl. Why did it drop in spite of using Normal Saline? Is her ADH level low/ normal/ high ? How would you treat her?
Case 1c, Hyponatremia 3 �5 � �y �. �o �. � �f �e �m �a �l �e � �w �i �t �h � �l �o �n �g � �h �i �s �t �o �r �y � �o �f � �m �e �n �t �a �l � �d �i �s �o �r �d �e �r �s � � �a �d �m �i �t �t �e �d � �t �o � �p �s �y �c �h � �s �e �r �v �i �c �e � �a �f �t �e �r � �p �l �a �c �i �n �g � �2 �5 � �s �e �w �i �n �g � �n �e �e �d �l �e �s � � �s �u �b �c �u �t �a �n �e �o �u �s �l �y � �i �n � �b�o�t�h� �f�o�r�e�a�r�m�s�.� �Y �o �u � �a �r �e � �c �o �n �s �u �l �t �e �d � �a �f �t �e �r � � �a �d �m �i �s �s �i �o �n � �l �a �b �s � �s �h �o �w � �s�e�r�u�m� �s�o�d�i�u�m� �=� �1�2�0� �m�E�q�/�L�.� �E �x �a �m � �s �h �o �w �s � �p �l �e �a �s �a �n �t � �f �e �m �a �l �e � �i �n � �n �o � �d �i �s �t �r �e �s �s � �c �o �n �s �i �d �e �r �i �n �g � �t �h �e � �s �c �a �r �r �i �n �g � �o �n � � �f �o �r �e �a �r �m �s � �( �f �r �o �m � �p �r �e �v �i �o �u �s � �s �u �r �g �i �c �a �l � �r �e �m �o �v �a �l � �o �f � �p �r �i �o �r � �n �e �e �d �l �e � �i�n�s�e�r�t�i�o�n�s�)�,� �n�o� �e�d�e�m�a�.� � �C�L�A�S�S�I�F�I�C�A�T�I�O�N�?� � � � A�D�H� �L�E�V�E�L� �=� �H�I�/�L�O�/�N�O�R�M� �?� � �W�H�Y�?� �T�r�e�a�t�m�e�n�t�?�
Pieces of metal in abdominal wall
Can you guess what she swallowed?
Hypernatremia
• Due to the patient’s inability to respond to thirst despite high ADH level – Fall at home with fracture – can’t get up – ECF/ Hospitalized with dementia – Intubated on vent in ICU – Heat illness/ heat stroke – OR
Hypernatremia
• Or Diabetes Insipidus – ADH - Low – Central DI
• Seen after catastrophic event/ pituitary necrosis • Sheehan’s Syndrome after peripartum
hemorrhage – ADH present but kidneys are resistant
• Nephrogenic DI • Seen in ATN, Lithium toxicity
Hypernatremia
• Urine osmo will be low due to free water loss in tubules
• Evaluate patient volume status – Hypervolemic – Euvolemic – Hypovolemic
Hypernatremia
• volume status – Hypervolemic
• Usually iatrogenic from sodium bicarb administration or IV’s
– Euvolemic • The DI syndromes
– Hypovolemic • Dehydration, heat illness, Immobility
Hypernatremia
• How does it Kill? – Brain shrinks away from the calverium – Large dural sinuses full of blood – Develop subdural hemorrhage
Hypernatremia
• Treatment – Hypotonic fluid resuscitation – Free water deficit calculator – deficit:= TBW X [(measured/140)-1] – TBW = 0.4X Wt in Kg – Sodium of 155 = 6 Liter deficit – How much water stays intravascular?
• Is there a risk of putting patients into CHF?
Only about 9% stays intravascular
Hypernatremia treatment
• For Hypervolemic patients • Can give metolazone to hypervolemic patients to
augment natriuresis – For DI patients/ Euvolemic
• Use DDAVP/ Vasopressin
Hypernatremia
• Once you calculate Free water deficit: – Give half the deficit over 24 hours – May shoot for more than that if the etiology
is still ongoing (fever, Diarrhea, osmotic diuresis, etc)
– How much water stays in the intravascular space?
Case 2a Hypernatremia �6 �5 � �Y �. �o �. � �d �i �a �b �e �t �i �c � �a �n �d � �h �y �p �e �r �t �e �n �s �i �v �e �, � �S �/ �P � �C �V �A �, � �b �e �d �r �i �d �d �e �n � �NNursing Home � � �p �a �t �i �e �n �t � �w �i �t �h � �f �e �v �e �r � �a �n �d � �m �e �n �t �a �l � �s �t �a �t �u �s � �c �h �a �n �g �e �s �. � �P �a �t �i �e �n �t � �w �a �s � �o �n � �t �u �b �e � �f�e�e�d�i�n�g�s�,� �h�a�d� �d�i�a�r�r�h�e�a�.� � �E �x �a �m � �r �e �v �e �a �l �s � BP of 140/70, Pulse 98, Resp 20 �d �r �y � �s �k �i �n � �a �n �d � �m �o �u �t �h �, � Chest is clear, no rub, no edema. �S�e�r�u�m� �s�o�d�i�u�m� �=� �1�5�5� �m�E�q�/�l�.� � � �C�L�A�S�S�I�F�I�C�A�T�I�O�N�?� we classify Hypernatremia disorders similar to Hyponatremia disorders, based on volume status. � A�D�H� �L�E�V�E�L� �=� �H�I�/�L�O�/�N�O�R�M� �?� � � T�r�e�a�t�m�e�n�t�?�
Case 2b Hypernatremia �3 �5 � �y �. �o �. � �f �e �m �a �l �e � �s �u �f �f �e �r �s � �a �i �r � �e �m �b �o �l �i �s �m � �d �u �r �i �n �g � �s �a �l �p �i �n �g �o �s �c �o �p �y �, � � �r �e �q �u �i �r �i �n �g � �C �P �R � �f �o �r � �4 �5 � �m �i �n �u �t �e �s �. � �B �l �o �o �d � �p �r �e �s �s �u �r �e � �a �n �d � �p �u �l �s �e � � �s �t �a �b �i �l �i �z �e � �a �f �t �e �r � �p �a �t �i �e �n �t � �i �s � �t �a �k �e �n � �t �o � �h �y �p �e �r �b �a �r �i �c � �c �h �a �m �b �e �r � �f �o �r � �2 � � �h �o �u �r �s �. � �W �h �i �l �e � �i �n � �t �h �e � �c �h �a �m �b �e �r � �s �h �e � �i �s � �n �o �t �e �d � �t �o � �b �e �g �i �n � �l �a �r �g �e � �v �o �l �u �m �e � �d �i �u �r �e �s �i �s � �w �h �i �c �h � �e �v �e �n �t �u �a �l �l �y � �r �e �a �c �h �e �s � �2 �0 � �l�i�t�e�r�s� �i�n� �1�8� �h�o�u�r�s�.� Serum� �s�o�d�i�u�m� �=� �1�6�5�m�E�q�/�l�.� � � D�I�A�G�N�O�S�I�S�?� �A�D�H� �L�E�V�E�L� �=� �H�I�/�L�O�/�N�O�R�M� �?� � �T�r�e�a�t�m�e�n�t�?� �
Case 3a Hypokalemia �2�6 � �y �.�o �.� �f �e�m �a�l�e� �r�e�f �e�r�r �e �d � �f �o�r � �e �v �a�l�u �a�t�i�o�n� �o�f � �" �R�u �l�e� �o �u �t� �B �a �r �t �t �e �r �s � �S �y �n�d�r�o �m �e�" � �d�u�e� �t�o� �p �e�r�s�i�s�t�e�n �t� �h �y �p�o�k�a�l�e�m �i�a�, hypochloremia, �a�n �d � �a �l �k �a �l �o �s �i �s �. � � E�x �a�m � �r �e �v �e �a �l �s � � BP 90/40, pulse 65, �e�m�a �c �i �a �t �e �d� �w �h �i�t�e� �f �e�m �a�l�e� �w �i�t�h � �f �i�n �e� �l�a�n �u �g �o� �h �a�i�r � �o�n � �b �a�c�k �,� �p�o�o �r� �d �e�n �t�i�t�i�o�n �,� �a�n�d� �s �m �a �l�l� �s �c �a �r �s � �o �v �e�r � �k�n �u �c �k �l �e �s � �o�f� �l�e�f �t� �h �a �n �d �. � �U�r �i�n �e � � �K �= �4 �0 �,� �U �r �i�n �e � �C �l �< �1 �0 �. � �s�e�r�u �m � �k �=� �2�. �5 � �m �E�q �/�l�,� �H �C�O �3� �=� �3�2 �, � � �P �O�4� �=� �2 �. �0 �. � ��W�h �a�t� �i�s� �B �a�r �t�t�e�r �' �s � �s�y �n �d�r �o�m �e�? � �W�h �a�t� �i�s � �h �e �r � �d �i�a �g �n �o�s�i�s�? � �
Case 3a Hypokalemia � ���B�a�r �t�t�e�r �' �s� �s�y �n �d�r�o �m �e� can be thought of as a tubular problem in the kidneys in which the tubules do not resorb chloride normally. The result is chloride wasting, Hypokalemia, a contraction alkalosis, low BP and High aldosterone levels. �It is diagnosed by measuring urine chloride, which should be high. Her labwork: �U�r �i�n �e � � �K �= �4 �0 �,� �U �r �i�n �e � �C �l �< �1 �0 �. � �s�e�r�u �m � �k �=� �2�. �5 � �m �E�q �/�l�,� �H �C�O �3� �=� �3�2 �, � � �P �O�4� �=� �2 �.�0�.� What is her condition? �
Case 3 b, Hypokalemia �1�6 � �y �.�o �.� �h �i�s �p�a�n�i�c� �m �a �l �e � �a �d �m �i�t�t�e�d� �d �u �e� �t�o� �p �r �o �f�o �u �n�d� �w �e�a�k �n�e�s�s�.� � �N o nf �o�c�a�l� �n �e�u�r�o�l�o �g �i�c� �e�x �a�m � �e�x �c �e �p �t� �f �o �r � �s �y �m �m�e�t�r �i�c� �w �e�a�k �n �e �s s �. � � �N�o�r�m �a�l� �C�T � �a�n �d� �L �P� �a �r �e � �p �e �r �f �o�r�m �e�d � �b �e �f �o�r �e� �e�l�e�c�t�r �o�l�y �t�e�s � �r�e�t�u �r�n � � �r �e �v �e �a �l �i �n �g � �s �e�r �u �m� �p�o�t�a�s �s �i�u �m � �=� �2 �.�0 � �m �E �q �/�l�,� �H �C �O �3 � �= � �1 �2 �. � �H �e � � �s �u �b�s �e�q�u�e�n �t�l�y � � �a �d �m �i�t�s � �t�o� �i�n �h �a�l�i�n �g � �c�o �r �r�e �c �t�i�o �n � �f �l�u �i�d� �w �h �i�c�h � � �c �o �n �t �a �i �n �s � �t�o�l�u �e�n �e �. � � �D�i�a�g �n �o�s�i�s�? �
Case 3 b, Hypokalemia
�In the Dayton area, a couple of teenage boys die every year from huffing gas in a garage. The same process is operative, an acquired Renal Tubular Acidosis (RTA) from the inhalation of solvent.
Case 4 Hyperkalemia �2�6 � �y �.�o �.� �f �e�m �a�l�e� �w �i�t�h � �H �I �V � �r �e �f �e�r�r �e�d� �f �o�r � �e�v �a�l�u �a�t�i�o�n � �o�f � � �p �e �r �s�i�s�t�e�n �t � �h �y�p�e�r �k�a�l�e�m �i�a�.� �S �h �e� �h �a�s � �a� �h�i�s �t�o�r �y � �o�f � �m �y�o �t �o �n �i �c � �d �y �s�t�r�o�p �h �y � �(�a�n � �i�n �h �e �r �i �t �e �d � �s�y �n �d�r �o �m �e� �o�f � �i�n �v�o�l�u �n�t�a�r�y � �m�u �s�c�l�e� �f �a�s�c�i�c�u �l�a�t�i�o�n � �a�n �d� �s �p�a�s �m �) �. � � E�x �a�m � �i�s� �n �o�r�m �a�l� �w �i�t�h � �t�h �e� �e�x �c�e�p�t�i�o�n� � �o�f� �h �e�r� �i�n �i�t�i�a�l� �h �a�n �d�s�h �a�k�e� �- � �s�h �e� �w �a�s � �u �n �a �b �l�e � �t�o � �l�e �t� �g �o � �f �o�r� �1�0 � �s �e�c�o �n �d�s�. � �S �e�r �u �m � �p�o�t�a�s�s�i�u �m � �=� �5�. �8� with a range from 5.4 to 6.0 ��D�i�f �f �e�r�e�n�t�i�a�l�? � � �H�o�w � �m �i�g�h �t� �y �o�u � �e�v �a�l�u�a�t�e�? � �M�a�n �a�g�e�m �e�n �t�? �
Case 4 Hyperkalemia �2�6 � �y �.�o �.� �f �e�m �a�l�e� �w �i�t�h � �H �I �V � �r �e �f �e�r�r �e�d� �f �o�r � �e�v �a�l�u �a�t�i�o�n � �o�f � � �p �e �r �s�i�s�t�e�n �t � �h �y�p�e�r �k�a�l�e�m �i�a�.� �S �h �e� �h �a�s � �a� �h�i�s �t�o�r �y � �o�f � �m �y�o �t �o �n �i �c � �d �y �s�t�r�o�p �h �y � �(�a�n � �i�n �h �e �r �i �t �e �d � �s�y �n �d�r �o �m �e� �o�f � �i�n �v�o�l�u �n�t�a�r�y � �m�u �s�c�l�e� �f �a�s�c�i�c�u �l�a�t�i�o�n � �a�n �d� �s �p�a�s �m �) �. � � ��D�i�f �f �e�r�e�n�t�i�a�l�? � � R habdomyolysis Medication effects Adrenal dysfunction Obstructive uropathy �H�o�w � �m �i�g�h �t� �y �o�u � �e�v �a�l�u�a�t�e�? � C PK 68 S he was not on medications Cortisol level 6, with poor response to ACTH Bladder post void less than 10 cc. �M�a�n �a�g�e�m �e�n �t�? �
Case 4 Hyperkalemia �2�6 � �y �.�o �.� �f �e�m �a�l�e� �w �i�t�h � �H �I �V � �r �e �f �e�r�r �e�d� �f �o�r � �e�v �a�l�u �a�t�i�o�n � �o�f � � �p �e �r �s�i�s�t�e�n �t � �h �y�p�e�r �k�a�l�e�m �i�a�.� �S �h �e� �h �a�s � �a� �h�i�s �t�o�r �y � �o�f � �m �y�o �t �o �n �i �c � �d �y �s�t�r�o�p �h �y � �(�a�n � �i�n �h �e �r �i �t �e �d � �s�y �n �d�r �o �m �e� �o�f � �i�n �v�o�l�u �n�t�a�r�y � �m�u �s�c�l�e� �f �a�s�c�i�c�u �l�a�t�i�o�n � �a�n �d� �s �p�a�s �m �) �. � � ��Always consider adrenal disorders (Addison’s) and obstructive uropathy in patients with hyperkalemia out of proportion to their renal dysfunction. It turns out that one of the earliest manifestations of HIV disease with respect to Nephrology is hyperkalemia from early adrenal dysfunction. �M �a�n �a�g�e�m �e�n �t�? � Flurinef
Case 5, Hypercalcemia
�4�6 � �y �.�o �.� �f �e�m �a�l�e� �p�r �e�s �e�n �t�s � �t�o� �c�l�i�n �i�c� �w �i�t�h � �c�o�m �p�l�a�i�n �t � �o �f � � �w �o �r �s �e�n �i�n�g � �c�h �r�o�n �i�c� �c�o �n �s �t�i�p�a�t�i�o�n � �a�n�d� �f �a�t�i�g �u �e�. � �E�x �a�m � �i�s � � �u�n�r�e�m �a �r �k �a �b �l �e �. � � L �a�b� �e�v �a�l�u �a�t�i�o�n� �r �e�v �e�a�l�s � �s �e�r �u �m � �C�a�l�c�i�u �m � �=� �1�1 �. �5 � � �w �i�t�h � �a�l�b�u�m �i�n � �=� �4 �. �0 �. � � � W�h �a�t� �t�e�s�t� �w �o�u �l�d � �y �o�u � �o �r �d�e�r � �n �e�x �t�? � �( �S�u �t�t�o�n �' �s� �L �a�w �) �
Case 6 Hypocalcemia �6�5 � �y �.�o �.� �d�i�a�b �e �t�i�c � �d �i�a �l�y �s �i�s � �p�a�t�i�e�n �t� �n �o�t�e�d� �o�n� �r �o �u �t�i�n �e � �l �a �b �s � �t �o � � �h �a�v �e� �a�l�b�u�m �i�n � �=� �1 �.�9 �,� �s �e�r �u �m � �c�a�l�c�i�u �m � �=� �6 �.�0 �,� �s �e�r �u �m � �P �O �4� �=� �1�1 �. �9 �. � ��C�o�r �r �e�c�t�e�d � �c�a�l�c�i�u �m � �=�? � �P�T �H � �l�e�v �e�l� �=� �h�i�/�l�o�/�n �o �r �m �? � � E�t�i�o�l�o�g�y �? � � �T �r �e�a�t�m �e�n�t�? �
Case 6 Hypocalcemia �6�5 � �y �.�o �.� �d�i�a�b �e �t�i�c � �d �i�a �l�y �s �i�s � �p�a�t�i�e�n �t� �n �o�t�e�d� �o�n� �r �o �u �t�i�n �e � �l �a �b �s � �t �o � � �h �a�v �e� �a�l�b�u�m �i�n � �=� �1 �.�9 �,� �s �e�r �u �m � �c�a�l�c�i�u �m � �=� �6 �.�0 �,� �s �e�r �u �m � �P �O �4� �=� �1�1 �. �9 �. � ��C�o�r �r �e�c�t�e�d � �c�a�l�c�i�u �m � �= � 7.6 (each gram of albumin carries 0.8 gm of calcium) so correct for an albumin of 4.0 � �P�T �H � �l�e�v �e�l� �=� �h�i�/�l�o�/�n �o �r �m �? � � HIGH (target in dialysis 150-400), normal is less than 75 E�t�i�o�l�o�g�y �? � � Inadequate production and conversion of Vitamin D �T �r �e�a�t�m �e�n�t�? � Vitamin D supplementation/analogue, Ca l c ium supplementation (sometimes) Phosphate binders to lower Phos.
Case 7, Hypomagnesemia
�34 �y �.�o �.� �m �a�l�e� �w �i�t�h � �C�r �o�h�n �' �s � �d�i�s �e�a�s �e� �r �e�p�o �r�t�s� �f �l�a �r�e � �o �f � �h �i�s� �s�y �m �p �t �o �m �s � �i�n �c�l�u �d�i�n �g � �d �i�a �r �r �h �e�a �, � �a �r �t �h �r�a�l�g �i�a�,� �f �e�v�e�r� �a�n �d� �f ��a�t�i�g �u �e�. � ��L �a �b �s � �r �e �v �e �a �l� �s �e �r �u �m � �C�a�l�c�i�u �m � �=� �7�. �0�,� �A �l�b�u�m �i�n � �=� �1 �.�9 �,� �M �a �g �n �e�s�i�u �m � �=� �1�.�0�. � � �E �t �i �o �l �o �g �y � �o �f � �h �y�p �o �m �a�g� �c�o�m �b�i�n �e�d� �w �i�t�h � �h �y �p�o �c �a �l�c �e �m �i�a�? �
�U�r �i�n �e� �m �a�g �n �e�s�i�u �m � �e�x �c�r �e�t�i�o�n�? � �h �i�/�l�o�/�n �o�r�m �a �l �
Case 7, Hypomagnesemia �34 �y �.�o �.� �m �a �l �e � �H �i�s � �C�r �o�h �n �' �s � �r �e �s �p �o �n �d �s � �t �o � �t �r �e �a �t �m �e�n�t� �a�n �d� �h�i�s� �l�y �t�e�s � �a�n �d� �a�l�b�u�m �i�n �
�normalize �.� �H �e� �s �u �b�s �e�q�u�e�n �t�l�y � �i�s� �d �i�a�g �n �o�s�e�d� �w �i�t�h � �t�e�s�t�i�c�u �l �a �r � �carcinoma �(�B �-�h �c�g � �+�,� �n�o�n �s�e�m �i�n �o�m �a�t�o�u �s �) � �a�n �d � �r�e�c�e�i�v �e�s � �chemo�t�h�e�r �a�p�y � �w �i�t�h � �c�i�s �p�l�a�t�i�n �u �m �. �
�N�o�w � �l�a �b �s � �r �e �v �e �a �l� �n �o�r �m �a�l� ��c�o�r �r �e �c �t �e �d � �c �a �l �c �i �u �m�,� �M �a �g �n�e�s�i�u �m � �=� �1�.�0�, �
�p�o �t�a�s�s�i�u �m � �=� �3�.�0�.� � � R�e�p�l�a�c�e�m �e�n �t� �w �i�t�h � �u�p� �t�o� �4�0�0 � �m �E�q �/�d�a�y � �o �f � �p�o �t�a�s�s�i�u �m � �f �a �i �l �s � �t �o �
�improve� �t�h �e� �h �y�p�o�k�a�l�e�m �i�a�.� �E�t�i�o�l�o �g �y � �o �f � �h �y�p�o�m �a�g � �c�o �m �b�i�n �e�d� �w �i�t�h � �hypo �k �a�l�e�m �i�a�? � �U �r �i�n �e� �M�a�g �n �e�s�i�u �m � �e �x �c �r �e �t�i�o �n �? � �h �i�/�l�o�/�n �o�r�m
Case 8 Hypermagnesemia
• Hypermagnesemia is seen only in patients with renal failure who are supplemented,
• or in cases where large amounts of magnesium are infused.
Case 9, Hypophosphatemia See Case 3 with Anorexia and severe malnutrition. Attempts to force feed her with tube feeds and TPN result in severe muscle fatigue and respiratory failure. She develops renal failure, heart failure and cardiovascular collapse. Urinalysis shows 4+ blood but the microscopic exam of the urine is negative for more than a few RBC’s. PO4 level : 2.0 before the feeding, up to 6 the next day as she gets intubated. Potassium 2.9 before, goes up to 7 the next day. Diagnosis?
Case 9 Hyperphosphatemia • Classic presentation of Hypophosphatemic
rhabdomyolysis. • Prolonged NPO status/starvation • Resp failure requiring reintubation after
extubation or surgery. Due to resp muscle weakness.
• Phos goes very low, then suddenly climbs without any supplementation. Associated with high K and Low calcium.
• Creatinine climbs more than 1.0 mg/dl/day, suggesting increased creatinine production
Reference
• Narins. Fluid and Electrolyte Disorders: Am journal of Medicine, 1982