A comatose patient after sustaining severe head injury has been admitted in neurosurgical ICU. Which of the following parameters should ideally be maintained in this patient ? 1. $pCO_2 = 4.5 – 5.0$ kPa ($33-38$ mm Hg) 2. MAP = $80 – 90$ mm of Hg 3. $pO_2 > 11$ kPa ($> 80$ mm Hg) 4. $Na^+ < 130$ meq/L Select the correct answer using the code given below :
Severe Head Injury Management: Key ICU Parameters
Effective management of comatose patients with severe head injuries in the neurosurgical ICU requires meticulous control of specific physiological parameters to optimize brain function and prevent secondary insults.
Parameter 1: $pCO_2$ Control
The target range for partial pressure of carbon dioxide (\text{$pCO_2$}) is \text{$4.5 \text{–} 5.0$ kPa} (\text{$33 \text{–} 38$ mm Hg}). This range is important to avoid hypocapnia, which can reduce cerebral blood flow, and hypercapnia. It supports adequate cerebral perfusion.
Parameter 2: Mean Arterial Pressure (MAP)
Maintaining Mean Arterial Pressure (\text{MAP}) is crucial for ensuring adequate cerebral perfusion pressure (\text{CPP}). A target \text{MAP} of \text{$80 \text{–} 90$ mm of Hg} helps guarantee sufficient blood flow to the brain, especially when intracranial pressure (\text{ICP}) may be elevated.
Parameter 4: Serum Sodium ($Na^+$) Levels
Serum sodium (\text{$Na^+$}) levels require careful management. The parameter \text{$Na^+ < 130$ meq/L} indicates the need to prevent levels from dropping below this threshold. Maintaining \text{$Na^+$} at or above \text{$130$ meq/L} is vital to prevent cerebral edema and associated complications.
Conclusion on Essential Parameters
The parameters ideally maintained in a comatose patient with severe head injury are:
- \text{$pCO_2$} within \text{$4.5 \text{–} 5.0$ kPa} (\text{$33 \text{–} 38$ mm Hg})
- \text{MAP} between \text{$80 \text{–} 90$ mm of Hg}
- Serum sodium (\text{$Na^+$}) levels ideally kept \text{$\ge 130$ meq/L} (avoiding < \text{$130$ meq/L})
Therefore, parameters 1, 2, and 4 are selected as essential.
Important Questions from Brain & Nervous System Surgery
Which of the following chromosomal abnormalities are associated with brain tumours?
1. Neurofibromatosis type 1
2. Neurofibromatosis type 2
3. Peutz-Jeghers syndrome
4. Hereditary nonpolyposis colorectal cancer
Select the correct answer using the code given below.
Consider the following clinical features:
1. Raised ICP
2. Seizures
3. Focal deficit
4. Headache
Which of the above clinical features are related to most brain tumours?
- The most common type of brain tumours associated with neurofibromatosis type 1 brain tumour syndrome is
Upper motor neuron lesions are characterized by which of the following?
1. Increased tone spasticity
2. Hyperreflexia
3. Absent plantar response
4. Motor weakness
Select the correct answer using the code given below.
- A patient with suspected head injury is brought to the emergency following road traffic accident. At the time of examination, patient is conscious with GCS 14/15 and stable vitals. There is bleeding from right ear and CSF leak from nose. Bruising is present behind the right ear. The most probable clinical diagnosis in this patient is
