Anestezjologia. Intensywna Terapia 1/2016-Intra-abdominal hypertension complicating pancreatitis-induced acute respiratory distress syndrome in three patients on extracorporeal membrane oxygenation

PRACE ORYGINALNE I KLINICZNE

Intra-abdominal hypertension complicating pancreatitis-induced acute respiratory distress syndrome in three patients on extracorporeal membrane oxygenation

Lee Feddy1, Julian Barker1, Pete Fawcett2, Ignacio Malagon1

1Consultant in Cardiothoracic Anaesthesia and Intensive Care, University Hospital of South Manchester, United Kingdom

2ECMO Coordinator, University Hospital of South Manchester, UK United Kingdom

Abstract

Background: Severe acute pancreatitis is associated with sever multiorgan failure from 15 to 50%, depending on the series. In some of these patients, conventional methods of ventilation and respiratory support will fail, demanding the use of extracorporeal membrane oxygenation (ECMO). Abdominal compartment syndrome is potentially harmful in this cohort of patients. We describe the successful treatment of three patients with severe acute pancreatitis who underwent respiratory ECMO and where intra abdominal pressure was monitored regularly.

Methods: Retrospective review of case notes.

Results: Three patients with severe acute pancreatitis requiring ECMO suffered from increased intra abdominal pressure during their ICU stay. No surgical interventions were taken to relieve abdominal compartment syndrome. Survival to hospital discharge was 100%

Conclusions: Monitoring intraabdominal pressure is a valuable adjunct to decision making while caring for these high-risk critically ill patients.

 

Key words: severe acute pancreatitis, intraabdominal pressure, ECMO

 

Anestezjologia Intensywna Terapia 2016, tom XLVIII, nr 1, 30–34

Należy cytować wersję:

Feddy L, Barker J, Fawcett P, Malagon I: Intra-abdominal hypertension complicating pancreatitis-induced acute respiratory distress syndrome in three patients on extracorporeal membrane oxygenation. Anaesthesiol Intensive Ther 2016; 48: 29–33. doi: 10.5603/AIT.a2015.0071.

Acute pancreatitis (AP) is an inflammatory disorder induced mostly by gallstones or excessive alcohol consumption. Clinical presentation varies from mild abdominal symptoms to severe multi-organ failure. Approximately 20% of patients present with the most severe form, severe acute pancreatitis (SAP) [1]. It is widely accepted that mortality has decreased over the past decades. However, patients with SAP requiring admission to an intensive care unit (ICU) have mortality rates between 30–50%. There is no particular treatment that has demonstrated in a controlled randomised trial to have a significant impact on reduction of mortality in this cohort of patients [2, 3].

The incidence of pulmonary complications in SAP varies from 15% to 55%, and in its more severe form will induce fulminant acute respiratory distress syndrome (ARDS) [4]. The use of venous-venous extracorporeal membrane oxygenation (VV-ECMO), or respiratory ECMO, is becoming common practice in patients with SAP and ARDS, where conventional mechanical ventilation has failed. Survival in this very specific cohort of patients varies from 63% to 100% [5, 6].

Intra-abdominal hypertension (IAH), defined as a sustained increase in intra-abdominal pressure (IAP) above 12 mm Hg, is prevalent in mechanically ventilated patients while abdominal compartment syndrome (ACS) occurs in less than 5% of mechanically ventilated patients [7].

Patients on VV-ECMO with SAP have many of the risk factors to potentially develop ACS [8]. We describe three male patients successfully treated with VV-ECMO for respiratory failure secondary to acute alcoholic pancreatitis, where IAP was measured actively during admission to an ICU.

METHODS

Case notes of three patients with SAP that required VV-ECMO were retrospectively reviewed. Written informed consent was obtained from all patients to use data from their case notes in an anonymised way for the purpose of scientific publication. Data collection included extricating data from written, as well as electronic files. Intra-abdominal pressure was measured using the standard technique previously described [8].

PATIENT 1

A 42-year-old man with a history of hypertension and obesity, and with a body mass index (BMI) of 34 (weight 110 kg), presented with acute alcoholic pancreatitis. Serum amylase > 2000 U L-1 and CT imaging of the pancreas revealed a large inflammatory mass and 50% necrosis. ARDS developed and he required intubation on day 5. On day 13 he was transferred to our unit for ECMO support (Table 1). A 31F Avalon cannula (Avalon Elite®, MAQUET Holding B.V. & Co. KG, Germany) was inserted into the right internal jugular vein (RIJ). Saturations remained low and an additional right femoral 22F venous drainage line was added and saturations improved to 85%. Further management consisted of cardiovascular support, nasogastric (NG) feeding and antimicrobial therapy. A surgical opinion was sought and conservative management felt to be most appropriate.

Table 1. Pre ECMO referral data

  Patient 1 Patient 2 Patient 3
Age (years) 42 30 46
Number of days ventilated 13 < 1 10
PaO2/FiO2 67 42.75 58
PEEP (cm H2O) 14 10 12
CXR quadrants infiltrated (pre ECMO) 3 (Fig.1) 3 (Fig. 2) 4 (Fig. 3)
Murray Score 3.75 3.25 3.5
BMI (kg m-2) 34 33 29.4
Pancreatic
Necrosis demonstrated on computer tomography (CT)
50% 30% Discernible
Heart rate 120 sinus 140 sinus 127 sinus
Vasopressors/Inotropes Noradrenaline Noradrenaline Nil
Positive Fluid balance since admission (L) 8 9 5
Urine output (mL h-1) 40 on frusemide 10 mg h-1 10 on frusemide 20 mg h-1 100 on frusemide 10 mg h-1
Feed Total
Parenteral
Nutrition (TPN)
NG NG
Absorbing No Yes Yes

Figure 1. Chest X Ray of patient 1 in the previous 24 hrs prior to ECMO initiation

Figure 2. Chest X Ray of patient 2 in the previous 24 hrs prior to ECMO initiation

Figure 3. Chest X Ray of patient 3 in the previous 24 hrs prior to ECMO initiation

By day 4, oxygenation saturations remained in the mid 80s and a decision to change the oxygenator and add a second one improved saturations to 97%. Over the next 2 weeks the patient developed IAH progressing to ACS (IAP up to 37 mm Hg). Enteral feeding was switched to total parenteral nutrition. Renal failure ensued and he required renal replacement therapy with continuous veno-venous haemofiltration (CVVH). Inflammatory markers remained static and a repeat CT scan demonstrated 70% necrosis with fluid collection around the tail. However, no gas was identified. After careful consideration, conservative management was adopted.

Nevertheless, a laparostomy for management of ACS was considered. Over the period of admission in our intensive care unit a total of three ultrasound-guided ascitic drains were inserted by a radiologist. On day 17, gastrointestinal function did return and NG feeding was recommenced. On day 18, neutropenia developed with a white cell count of 1 G L-1 (neutrophils 0.01). Granulocyte colony stimulating factor (G-CSF), methyprednisolone and IV immunoglobulins were commenced with an improvement in the white cell count. A bone marrow aspirate showed evidence of haemophagocytosis.

Multiple attempts to wean the patient off ECMO failed with worsening metabolic acidosis and poor oxygenation. A further CT scan revealed virtual total pancreatic necrosis. Although repeated drops in haemoglobin led to a CT angiogram being performed to rule out gastrointestinal bleeding, this was non-diagnostic. An oesophagogastroduodenoscopy revealed the appearance of portal hypertensive gastropathy but no active bleeding. A tracheostomy was performed on day 25. ECMO was finally stopped successfully after a total of 637 hours.

PATIENT 2

A 30-year-old male, weighing 95 kg, presented with typical features of severe alcoholic pancreatitis. CT imaging demonstrated 30% necrosis of the pancreatic tail. He was admitted to the general intensive care unit for monitoring and observation. 24 hours later he had a seizure thought to be caused by alcohol withdrawal. Sedation and intubation were performed. Conventional ventilation and a trial of Nitric Oxide were unable to maintain adequate oxygenation. Proning was deemed unsafe due to desaturations to 70% while lying flat. Blood gases prior to ECMO revealed a pH 7.0, pO5.7 kPa, pCO15.9 kPa, BE -4.7 and HCO3 20.6 mmol L-1 (Table 1). Cannulation with a 31F and 27F Avalon cannula (Avalon Elite®, MAQUET Holding B.V. & Co. KG, Germany) was unsuccessful in the RIJ, but was achieved using a 20F RIJ return and 24F left femoral drainage single lumen cannulas.

During the first 48 hours, oxygen saturations remained about 85% while the patient developed IAH progressing towards ACS with pressures up to 38 mm Hg. Supportive therapy included antimicrobials, total parenteral nutrition and CVVH. IAH had resolved by day 5. A tracheostomy was performed on day 8 and he was weaned off ECMO after 219 hours.

PATIENT 3

A 46-year-old male, weighing 100 kg, with a history of alcohol intake exceeding 140 units per week presented with acute pancreatitis. Initially, he was managed on a surgical ward. Within 48 hours he developed respiratory failure and required intubation and ventilation. CT imaging confirmed pancreatitis with discernible necrosis. Oxygen requirements increased and there were two episodes of prone positioning with short term improvements. After four days of heavy ventilation, he was referred for ECMO. Cannulation of the right internal jugular vein with a 31F Avalon cannula (Avalon Elite®, MAQUET Holding B.V. & Co. KG, Germany) achieved flows of 5 litres.

The first 72 hours of care included achieving a negative fluid balance with CVVH and antimicrobial treatment of Staphylococcus aureus isolated from a tracheal aspirate with Piperacillin/tazobactam and Clindamycin.

The white cell count and C-reactive protein (CRP), peaked at 16.7 G L-1 and 501 mg L-1 respectively. A blood Herpes Simplex Virus PCR was positive and Acyclovir was added. On the initial surgical review, he was absorbing the nasogastric feed hence a conservative management plan chosen.

By day 4 he developed nasogastric feed failure despite prokinetics. A repeat surgical review was requested at the time of recording a maximum IAP of 26 mm Hg (see Table 2).

Table 2. Pre-, during and post-ECMO data in 3 patients

  Pre ECMO During ECMO Post ECMO
Patient Pat 1 Pat 2 Pat 3 Pat 1 Pat 2 Pat 3 Pat 1 Pat 2 Pat 3
Creatinine                  
(μmol L-1) 81 102 130 256 310 160 65 69 72
Bilirubin (μmol L-1) 29 54 38 46 63 48 19 31 28
Platelets                  
(G L-1) 198 207 473 53 59 126 169 160 159
SOFA Score 20 16 14 21 19 16 18 15 15
Maximum IAP (mm Hg) Not recorded Not recorded Not recorded 37 38 26 12 8 10
Lung compliance (mL cm H2O) 24 10 23 < 24 < 10 < 23 30 28 41

Mean PaO2/FiO56 mm Hg, mean Murray Score 3.5, mean duration on ECMO 408 hours. All patients had evidence of Intra-abdominal compartment syndrome (managed with non-surgical strategies), enteral feed and renal failure. Patient 1 had percutaneous ultrasound-guided ascitic drains sited

A large bore NG tube was inserted and allowed free drainage of abdominal contents. Enemas were prescribed with good effect.

On day 7, with falling inflammatory markers, methylprednisolone 2 mg kg-1 over 24 h in a continuous infusion was started. Repeat bronchoscopies showed evidence of thick tenacious secretions. As the patient developed an Escherichia coli infection from the bronchial lavages, meropenem was added.

By day 8, IAP was down to 12 mm Hg. A repeat CT scan showed resolution of the pancreatitis. By day 11, lung compliance remained poor and he was placed in the prone position for 16 hours. On day 15, the patient was successfully trialled off ECMO and later discharged to the general Intensive Care Unit. He has since had a percutaneous pancreatic necrosectomy and has been discharged home.

DISCUSSION

We present the successful treatment of severe acute pancreatitis in three patients requiring VV-ECMO. To our knowledge this is the first time that the regular monitoring of IAP in this cohort of patients has been reported. The measurement of IAH helped in the decision making process, in particular, when considering abdominal surgical intervention. All the patients survived discharge from hospital and are still alive.

The incidence of pulmonary complications following SAP is approximately 30%. Such patients have a mortality rate of more than 50% in the first week of admission to intensive care, if they require invasive ventilation [9]. Shields et al. [10] reviewed comprehensively the mechanisms leading to acute lung injury in SAP. Of interest is that these authors do not mention VV-ECMO as a strategy to rescue patients who fail conventional methods of ventilation.

This is not the first time that the use of VV-ECMO in SAP has been reported in the literature [5, 6]. In 1998, Peek et al. described a series of thee patients with SAP requiring VV-ECMO. Survival was 100%. None of the patients underwent laparotomy for either exploration or more aggressive intervention. Fourteen years later Bryner and colleagues reported a series of eight patients with similar presentation. Survival in this series was 63%. Five of the eight patients underwent exploratory laparotomy while on ECMO, some of them on more than one occasion. In our series, none of the patients underwent laparotomy while on VV-ECMO.

In a review of the Extracorporeal Life Support Organization (ELSO) registry data [11] gastrointestinal bleeding was identified as a common complication with an incidence of between 3 and 6%. Intestinal ischaemia does not feature as a complication.

Performing a laparotomy while on VV-ECMO is riddled with potential complications and its incidence has not been reported in the literature. Schreiber etal. [12] describe a retrospective review from a single centre. Forty-two patients underwent a laparotomy in the ICU as they were deemed too unstable to be transferred to the operating room. Two of these patients were on ECMO (not clear from the article if this was VA or VV-ECMO). Intestinal ischaemia was suspected in 24% of the patients. Total 28-day mortality was 75.6%.

All the patients in our series had high IAP. Indeed, these patients had many of the risk factors for developing IAH. ACS complicating VA-ECMO has been described in the paediatric literature [13] while all seven cases undergoing decompressive laparotomy died in a subsequent case series [14]. Two separate case reports [15, 16] describe the development of ACS in three adult patients while on VA-ECMO. Mortality was 50 and 100% respectively.

There is a paucity of information with regards to the prevalence and incidence of IAH and ACS in patients undergoing VV-ECMO. Given our100% survival, we can onlybutrecommend the regular measurement ofIAP in these patients. The lack of aggressive surgical intervention did not affect outcomes in our series.

CONCLUSIONS

Monitoring intra-abdominal pressure is a valuable adjunct to decision making while caring for critically ill patients with acute respiratory distress syndrome related to severe acute pancreatitis that are treated with VV-ECMO.

ACKNOWLEDGEMENTS

  1. The authors declare no financial disclosure.
  2. The authors declare no conflict of interest.

References:

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Adres do korespondencji:
Ignacio Malagon FRCA, PhD, FFICM
Consultant Cardiac Anaesthetist,
University Hospital South Manchester
Honorary Senior Lecturer, University of Manchester
Southmoor Road
Manchester, M23 9LT
United Kingdom
e-mail: Ignacio.Malagon@uhsm.nhs.uk

 

Otrzymano: 31.08.2015 r.
Zaakceptowano: 15.11.2015 r.

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