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Postoperative Day 1 After VSD Repair: Output Rising, Perfusion Falling

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Postoperative Day 1 After VSD Repair: Output Rising, Perfusion Falling

Four-month-old (5.2 kg) on postoperative day 1 after VSD repair. Over 3 hours: chest tube output rose from 5 to 15 mL/hr, HR 178, BP 68/38 (MAP 48), CVP 12 mmHg, temp 38.4 C, urine 0.4 mL/kg/hr, capillary refill 4 seconds, cool mottled extremities. Lactate rose from 2.1 to 4.2 mmol/L, mixed venous O2 saturation 48%. He is intubated and sedated on milrinone 0.5 mcg/kg/min and epinephrine 0.05 mcg/kg/min via a central line. The surgeon is in the OR for another 90 minutes; the intensivist is at the bedside. Bedside echocardiography is not immediately available, and the only other fellow on the unit is covering an ECMO admission.

1. What is the most likely explanation for this deterioration, and why are the alternatives less likely?

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Most likely: postoperative hemorrhage with early tamponade physiology.

Supporting pattern:

  • Chest tube output of 15 mL/hr in a 5.2 kg infant is ~3 mL/kg/hr - well above the ~1 mL/kg/hr threshold that should trigger concern.
  • Rising CVP (12 mmHg) with hypotension and a narrowed pulse pressure points to an obstructive/equalization component, not simple hypovolemia alone.
  • Cool mottled extremities, 4-second cap refill, urine 0.4 mL/kg/hr, SvO2 48%, and doubling lactate all describe low cardiac output, not a pure volume problem.
  • The combination of bleeding plus rising filling pressures is classic for clot around chest tubes or a mediastinal collection: the tube can clot and suddenly stop draining while the patient worsens, so a decreasing output is not reassuring.

Why not the others:

  • Sepsis: a single 38.4 C reading is common in the first 48 hours postoperatively; sepsis does not explain abrupt mediastinal bleeding and a rising CVP over 3 hours.
  • Residual shunt or myocardial dysfunction: usually a gradual course, not tightly coupled to chest tube output.
  • Hypovolemia alone: would give a low CVP, not 12 mmHg.

Treat as bleeding/tamponade until imaging or the surgeon disproves it.

2. List your priority actions for the next 15–30 minutes and identify at least two things you should deliberately avoid.

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Do now

  1. Escalate in parallel: page the surgeon out of the OR (do not wait 90 minutes), notify the intensivist, and get blood to the bedside.
  2. Volume, preferably blood: 10 mL/kg (about 50 mL) crystalloid as a bridge, but PRBC/FFP as the definitive resuscitation for hemorrhage.
  3. Labs: STAT CBC, coags, fibrinogen, type and crossmatch, ionized calcium, repeat lactate, ACT if a heparin infusion is running.
  4. Reassess the chest tubes: patency, kinks, clot at the insertion site, strip/milk per unit protocol; prepare for a pericardial drain or return to the OR.
  5. Hemodynamic support: increase epinephrine; reduce or hold milrinone - it is an inodilator and will worsen hypotension when the problem is obstruction/hypovolemia.
  6. Prepare for arrest: echo probe if available, pericardiocentesis supplies, code cart, blood in the room.

Deliberately avoid

  • Turning up milrinone or giving a vasodilator for "poor perfusion."
  • Diuretics for the CVP of 12.
  • Anchoring on the temperature and starting antibiotics as the primary response.
  • Accepting a falling chest tube output as improvement.

3. The surgeon says, "Just give a bolus and turn up the epi, I'll be there in 90 minutes." How do you proceed?

Read the worked answer

Comply with the safe parts and escalate the rest - this is a chain-of-command moment, not a compliance moment.

  • Do the orders that carry no delay risk (bolus, epinephrine titration) while stating the concern plainly: "Output is 3 mL/kg/hr, CVP is 12 and rising, SvO2 is 48% - I think we have tamponade and I need someone here now."
  • Ask for a specific alternative: bedside echo by the intensivist, a covering cardiac surgeon, or transfer to the OR - do not accept "in 90 minutes" as the only option.
  • Use the chain of command: intensivist → attending of record → house supervisor/nursing administrator. Document times, names, and the clinical data each person was given.
  • Keep the bedside ready for deterioration: blood in the room, pericardiocentesis tray, defibrillator, a second nurse.
  • Do not document a conclusion you don't believe to smooth the relationship. Objective data (output, CVP, lactate, SvO2) in the chart protects the patient and you.

The judgment being tested: physician reluctance is a barrier to escalate through, not a reason to stop treating what the data show.