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Eur J Cardiothorac Surg 1999;15:469-474
© 1999 Elsevier Science NL
a Department of Thoracic and Vascular Surgery, `Evangelismos' General Hospital, Athens, Greece
b 4th Department of General Surgery, `Evangelismos' General Hospital, Athens, Greece
c 3rd Department of General Surgery, `Evangelismos' General Hospital, Athens, Greece
d 2nd Department of General Surgery, `Evangelismos' General Hospital, Athens, Greece
e 1st Department of General Surgery, `Evangelismos' General Hospital, Athens, Greece
Received 21 September 1998; received in revised form 31 December 1998; accepted 2 February 1999.
Corresponding author. 34A Konstantinoupoleos str., GR 15562 Holargos Athens, Greece. Tel.: +30-1-651-0388; fax: +30-1-654-7695.
| Abstract |
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Key Words: Blunt trauma Diaphragm injury Diaphragmatic hernia Predictors of outcome
| Introduction |
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The diagnosis is often difficult and a delay in diagnosis is implicated in increased mortality and morbidity [1] [3] [6].
We reviewed the experience with BDR at `Evangelismos' General Hospital of Athens in order to identify: (1) predictors of outcome in BDR, and (2) factors contributing to diagnostic delay.
| Materials and methods |
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All the films of the radiologic exams (chest X-rays -CXR, computed tomography (CT)-scans) were retrospectively reviewed in order to identify signs suspicious for BDR that were overlooked at the initial radiologic interpretation.
Statistical data analysis was performed with Student's t-test or Chi2 test, where appropriate. Statistical significance was determined at P<0.05.
| Results |
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Our material comprises two distinct groups of patients: (i) patients with acute BDR (group A: 36, 88%), and (ii) patients with post-traumatic diaphragmatic hernia (TDH) (group B: 5, 12%).
Acute BDRs
Location of acute BDRs
In group A, there were 21 left-sided (58.3%), 13 right-sided (36.1%) and two bilateral BDRs (5.5%).
Diagnosis of acute BDRs
Diagnosis of BDR was made in less than 12 h in 33 cases (91.6%), and in less than 24 h in two cases with isolated BDR (5.5%). Preoperative diagnosis was made in only 26 cases (72.2%), and was based, partly on physical examination (absent respiratory sounds, audible enteric sounds in the chest), tympany/dullness on percussion of the chest, and mainly, on CXR findings (hemidiaphragm elevation, gas shadow in the (lower) chest, fusion/blurring of the diaphragm and lower lung fields, collapse/consolidation of basal lung segments, mediastinal shift, nasogastric tube in the chest) (
Fig. 1
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In the two cases with isolated BDR, the initial CXR was suspicious for BDR. This suspicion became stronger after the second CXR, obtained within the first 24 h, and diagnosis was confirmed with CT scan or/and upper GI contrast studies.
Intraoperative diagnosis of BDR was made in nine cases (27.2%). Physical examination was unreliable and, although CXRs (obtained in seven cases) were not normal, a preoperative diagnosis of BDR was not considered.
Diagnostic peritoneal lavage (DPL) was performed in 19 cases, and was positive for intraabdominal bleeding in 18 cases (94.7%). Hence, it was indirectly diagnostic for BDR.
In one patient with right lower rib fractures, pneumomediastinum, pneumopericardium, a right femoral fracture, and a negative DPL, a right BDR became apparent on CXR on hospitalization day 14 ( Fig. 2 A), 11 days after the patient had been weaned of the ventilatory support. The first CXR was completely normal (even in retrospective look). Diagnosis was confirmed with MRI ( Fig. 2B). He underwent a right thoracotomy, which revealed a large posterocentral musculotendinous BDR and a healed, grade I, laceration of the liver dome. BDR was repaired with interrupted absorbable sutures and the patient had a completely uneventful recovery.
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Thirteen patients (36.1%) were in hypovolemic shock on arrival. All our patient belonged to ASA Physical Status classification IV or V [7].
Surgical management of acute BDRs
BDR repair was accomplished through a laparotomy in 22 cases (61.1%), thoracotomy in 10 (27.7%), and laparo-thoracotomy in four (11.1%). Both interrupted and running techniques with both absorbable and non-absorbable suture were used.
An intraoperative description of the BDR was available in 27 cases with 29 acute BDRs (including the two patients with bilateral BDR). The length of the BDR ranged from 3 to 20 cm. The parts of the hemidiaphragm involved were: the muscular part in 11 cases (37.9%), the tendinous part in two cases (6.9%) and both in 16 cases (55.2%). The location was posterocentral in 19 cases (65.5%), and antero-lateral in 10 cases (34.5%) with pericardial involvement in one case.
Management of associated injuries in 31 patients who survived the operation included: splenectomy (n=11), suture of the spleen (n=4), suture of the liver (n=7) with or without tissue debridement, packing of the liver (n=2), lung lobectomy (n=3, atypical lobectomy: 2), nephrectomy (n=2), partial nephrectomy (n=1), transverse colectomy (n=2) with Hartman colostomy (n=1), suture of sigmoid (n=1), partial excision of jejunum (n=1) or ileum (n=1), suture-repair of ileum (n=1) or mesocolon (n=2), suture-repair of the inferior vena cava (n=2) or the common hepatic artery (n=1), proximal ligation of the splenic vein (n=1), ligation of intercostal arteries (n=2), rib fractures fixation with wire (n=2), craniotomy for sub-/epidural hematoma drainage (n=3), long-bone fractures fixation (n=8).
Outcome in acute BDRs
The hospital mortality rate in group A (acute BDRs) was 16.6% (6/36). Three patients died intraoperatively due to non-reversible hypovolemic shock. The rest three patients died on postoperative day (POD) 6, 59 and 94, due to ARDS, sepsis, and septic intraabdominal complications requiring multiple surgical interventions, respectively.
Both patients with bilateral BDR died. They had multiple intraabdominal injuries and were in shock at admission. One died intraoperatively due to non-reversible hypovolemic shock, and the other one on POD 94 due to multiple intraabdominal abscesses requiring multiple surgical interventions.
Postoperative complications encountered among 16 survivors were (morbidity rate: 53.3%): pneumonia (n=6, 20%), urinary tract infection (n=4, 13.3%), ARDS (n=3, 10%), multiple organ failure (n=2, 6.7%), renal failure (n=2, 6.7%), intraabdominal abscess (n=1, 3.3%), stress ulcer bleeding (n=1, 3.3%), temporary phrenic nerve palsy (n=1, 3.3%).
The hospital stay for the survivors was 853 (mean: 16) days. The ICU stay was 046 (mean: 5.8) days. The time spent on mechanical ventilation was 045 (mean: 4.8) days.
Predictors of outcome in acute BDRs
Of the variables tested as predictors of outcome in group A (acute BDRs), only age, hemodynamic status at admission, and ISS were predictive (Table 1).
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Traumatic diaphragmatic hernias (TDHs)
Location of TDHs
In group B (patients with TDH), location of TDH was in the left hemidiaphragm in three cases and in the right in two.
Diagnosis of TDHs
Diagnosis was delayed for 716 months after injury. In all cases the BDR was missed during the initial hospitalization. One patient with a left TDH had undergone surgery for intraabdominal trauma during the acute phase of injury but BDR was overlooked. Four patients had non-specific and inconstant symptoms as abdominal or/and chest pain, abdominal discomfort, dyspnea, respiratory infections. One patient presented with strangulation of hollow viscera. Diagnosis was made with CXR (n=4), upper GI studies (n=2), CT scan (n=2). In one case, the patient presented with dyspnea at the Emergency Department. The CXR demonstrated gas shadow (the gastric bubble) in the left middle and lower lung field, which was interpreted by the thoracic surgery resident as `basilar pneumothorax' (
Fig. 3
). Two thoracic tubes were inserted, one of which drained gastric fluid. The patient was promptly transfered to the operating room. Through a left thoracotomy a TDH containing the stomach and omentum was revealed, and was repaired, as well as the hole in the stomach.
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Outcome in TDHs
No mortality or major morbidity were encountered.
Location and delay in diagnosis of BDR
Considering delay in BDR diagnosis and location of BDR, no meaningful conclusions can be drawn, as three of 24 (12.5%) patients with a left-sided lesion and three of 15 (20%) patients with a right-sided one had a delay in BDR diagnosis (difference not statistically significant).
| Discussion |
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Diagnostic means for BDR including CXR, DPL, pneumoperitoneum, fluoroscopy, upper GI studies, ultrasound, CT scan, MRI, liver-spleen scintigraphy, peritoneo-scintigraphy lack both sensitivity and specificity [3] [17] [21] [22] [23] [24] [25].
CXR is currently the most valuable simple test, although, it can be diagnostic or suggestive of BDR in only 2870% of cases [21] [22]. Sensitivity of the initial CXR interpretation can be increased by heightened awareness of this injury [22]. Patients in our series had all but one abnormal CXRs in the retrospective review. Repeated CXR during hospitalization, as well as some days after discharge, is necessary in order to detect a herniation slowly increasing, as it happened in one of our patients.
CT scan is the second choice imaging technique, although the axial oriented diaphragm is not always well demonstrated with conventional CT. Wide ranges of sensitivity and specificity are reported as 5473 and 8690%, respectively [23]. The limitations of CT include difficulty in delineating hemidiaphragms from adjacent soft-tissue structures (i.e. atelectatic lung), big slice thickness (810 mm), and respiratory motion around the diaphragm [25]. Helical CT with axial, saggital and coronal reformations is possibly superior to conventional CT in diagnosing BDR [23]. In our series, a CT diagnostic value of 76.5% in BDR was obtained. The `collar sign' around herniated organs was observed in one fourth of our cases.
Studies have shown that MRI is helpful in equivocal cases of BDR [21] [24] [25]. Interruption of the diaphragmatic signal due to laceration may confirm a BDR. Unfortunately, MRI is not always available in the acute setting and even if it is, many trauma patients require support devices that are not compatible with MRI. In our series MRI was helpful in one case when we used it (a late appearance of a right BDR). MRI should be done in the acute setting when the diagnosis remains uncertain after CT, or for non-acute, clinical, or radiological presentation suggesting BDR [25].
Since 1993, when video-assisted thoracoscopic surgery (VATS) was first used to diagnose BDR [26], it has been proposed as a safe, expeditious, and accurate method of evaluating the diaphragm in trauma patients, comparable in diagnostic value to exploratory celiotomy (specificity, sensitivity and positive predictive value of 100%) [27]. But VATS has two important limitations: it cannot be performed in hemodynamically unstable patients, and it requires general anesthesia. In our Hospital VATS has been employed in our practice only recently and not in the trauma field yet.
A lesson demonstrated in the present series should be emphasized: a meticulous inspection of both hemidiaphragms must take place during any exploratory laparotomy for trauma [1] [5]. One of our patients presented with a left TDH had undergone surgery in the acute setting for intraabdominal injuries, but the BDR was overlooked. Missed BDR results inevitably in herniation of abdominal contents into the chest due to the intra-abdominal to intrathoracic pressure gradient reaching up to 100 mmHg during Valsalva manoeuvre (normal: 210 mmHg) [3] [6] [16]. Progressive herniation results to respiratory embarrassment, chronic abdominal complaints, and strangulation of abdominal viscera, contributing to the late morbidity and mortality of the missed injury. In our series late diagnosis and repair of a TDH had no influence in morbidity and mortality, and this is in accordance with others' observations [18].
| Conclusions |
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| Acknowledgments |
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| Footnotes |
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| References |
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