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An unusual intracardiac shunt secondary to penetrating cardiac trauma
  1. W J C Hobbs,
  2. B Clarke,
  3. N J Odom
  1. Manchester Heart Centre, Royal Infirmary, Oxford Road, Manchester M13 9WL, UK
  1. Dr Clarke.

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A 22 year old man was admitted to the accident and emergency department having sustained a 5 × 3 cm knife wound to the right anterior chest wall in the fourth intercostal space. He was haemodynamically stable on admission but dyspnoeic at rest. Pulse was 110 beats/min and blood pressure 106/60 mm Hg. The only abnormality on examination was dullness to percussion on the right chest wall; heart sounds were normal. A plain chest x ray confirmed a right haemothorax. Three litres of blood were drained using an intercostal drain. A median sternotomy was performed; the right internal thoracic artery, which had been transected, was ligated. A small laceration in the right atrioventricular groove was sutured.

The patient made an unremarkable recovery and was discharged home. He was reviewed three weeks later when examination revealed a pansystolic murmur over the whole precordium. A transthoracic echocardiogram showed a high velocity jet from the left ventricle to the right atrium. Transoesophageal echocardiography at a depth of 30 cm and in multiple planes demonstrated a laceration in the junction of the aortomitral continuity and the intra-atrial septum (figs 1 and 2). Colour flow mapping confirmed high velocity flow from the left ventricular outflow tract to right and left atria.

Figure 1

Left atrial (LA) to right atrial shunt. MV. Mitral valve; RV, right ventricle; LV, left ventricle.

Figure 2

Left ventricular outflow tract (LVOT) to left atrium (LA) shunt. LV, left ventricle.

He has remained well over the past 12 months and has been managed conservatively with regular follow up and advice about prophylactic antibiotics.

Discussion

Penetrating cardiac wounds are increasingly common, and advances in initial resuscitation and surgical management mean more patients are surviving the initial insult. There are often several lesions, and initial assessment in hypotensive patients, particularly with surgical emphysema, may not reveal all injuries.1 Others suggest that small defects may grow following fibrous retraction of wound edges, resolution of oedema, ventricular enlargement, and lysis of occluding clot, therefore becoming apparent at a later date.2 Stabilisation and surgical correction of life threatening lesions takes priority and this often means that the heart is not fully explored surgically. Earlier series have demonstrated numerous late sequelae including atrial and ventricular septal defects, tricuspid and mitral valve lacerations, and coronary artery injury. The reported incidence of late sequelae of 20% suggests that comprehensive postoperative evaluation is essential for all patients.3Not all of these defects are haemodynamically significant and may require only observation and advice regarding prophylactic antibiotics. Those that do require further surgery can be closed electively with little mortality or morbidity.1

Knife and bullet wounds at various levels of the interventricular and atrioventricular septum producing left ventricular to right ventricular or left ventricular to right atrial shunts are well described.4 To our knowledge survival with a left ventricular to left and right atrial shunt caused by a single knife wound is unique. Our case shows the clinical usefulness of transoesophageal echocardiography in detecting and fully delineating these lesions. It also demonstrates the anatomy of this area well, and reinforces the importance of echocardiography in the follow up of patients. To define fully the anatomical abnormality in this patient, omniplane transoesophageal echocardiography was essential.

References

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