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Flashcards in Postoperative Care Deck (20):

Calculation of intraoperative fluid requirements?

replacement fluid = Urine output + 3xEBL

(Three times EBL because 2/3 of replacement fluid moves extravascularly)


Estimate of maintenance fluid requirements?

First 10 kg – 100 mL per kilogram per day
Next 10 kg – 50
Beyond – 20 per kilogram

Aka 1500+20(weight-20)


For average patient – fluids to replace sodium, potassium, chloride?

D5 1/2NS + KCl 20 mEq/L


G.I. Tract that contains fluid with:
1. Highest and Lowest sodium?
2. Highest potassium?
3. Highest and Lowest chlorine?
4. Highest and lowest bicarb?

1. Small intestine and Large intestine
2. Large intestine; everywhere else equal
3. Gastric aspirate; large intestine
4. Pancreatic juice; gastric aspirate


Electrolyte composition of:
1. D5W
2. D10W
3. Normal saline
4. 1/2 normal saline
5. LR

1. 50 mg/dL glucose
2. 100 mg/dL glucose
3. 154 mEq per liter NECO
5. 77 mEq per liter NaCl
6. 130 Na, 110 Cl, 28 lactate, minimal K, Ca


How do patients fluid requirements change during postoperative course?

Complications for not adjusting IV intake postoperatively?

1. Begins to mobilize fluid from third space accumulation.
2. Excess fluid must be excreted by kidney, increasing intravascular space
3. Therefore IV fluid requirements decrease during recovery.

Overload, edema, pulmonary edema


Normal urine output?

.5-1 mL/Kg/hr


Patient admitted to hospital. Diuresis 400 mL per hour over next four hours and develops blood pressure of 80/60 – potential causes?

1. Diabetes insipidus
2. Renal disease with inability to concentrate urine
3. Postobstructive diuresis


Conditions that make patients more prone to postobstructive diuresis? Course of obstructive diuresis?

Chronic obstruction, CHF, hypertension, azotemia, edema

Self-limited, BUN and creatinine return to normal in 1-2 days


When to collect urine to determine cause of diuresis? Interpretation?

More than 200 mL per hour for two consecutive hours

Low osmolality – pathologic concentrating defect
High osmolality – osmotic diuresis


Post operative patient has urine output of 10 mL per hour for four hours – Management?

1. Check for mechanical problem with catheter (irrigate catheter and confirm position)
2. If fails, Volume resuscitation for patient
3. If it fails, central line to measure CVP
4. If normal, pulmonary artery catheter for preload and cardiac output


Postoperative patient develops gross hematuria with first liter of urine drained - differential?

1. Kidney stones
2. Over distention of bladder causing bladder wall injury
3. Trauma from Foley
4. Infection - prostatitis
5. Medications – cyclophosphamide


The most common cause if fever in the immediate postoperative period? Differential? Management?

1. Atelectasis (Incentive spirometry but No antibiotics)
2. Pneumonia (Antibiotics)
3. Pulmonary edema


Postoperative patient – when would pulmonary edema most likely occur? Why?

Several days after operation when 3rd space fluids mobilize


Postoperative patient with suspected urinary retention – work up?

Bladder ultrasound or catheter insertion


Postoperative patient – find pus on the skin at venipuncture exit site diagnosis? Other signs/symptoms?Treatment?

Suppurative phlebitis (infected thrombus in vein around indwelling catheter)

High fevers and positive blood cultures

1. Remove catheter
2. surgically excise vein
3. Antibiotics
4. Leave wound open


Patient with purulent drainage from wound site – fluctuance indicates?

Fluid Collection beneath skin – remove sutures/staples and drain pus


Patient who had removal of necrotic bowel and jejunostomy – POD5, notice intestinal contents draining from wound. Possible origin? Management?

1. Leak at jejunostomy insertion site
2. Breakdown of small bowel anastomosis
3. Missed enterotomy

1. Surgical reexploration if signs of peritonitis
2. Otherwise CT guided percutaneous drainage


Patient who had removal of necrotic bowel – POD5, notice intestinal contents draining from wound. Fistula draining adequately – management?

Manage non-operatively as enterocutaneous fistula

1. NPO
2. TPN
3. Daily measurement of fistula output, serum electrolytes
4. Should heal within five weeks


Factors associated with failure of fistula to heal?


Foreign bodies in the wound
Radiation damage
Infection or IBD
Epithelization of fistulous tract
Distal bowel obstruction