ICP - Nursing Case Study
Pathophysiology
• Primary mechanism: Intracranial Pressure (ICP) elevation occurs primarily due to an increase in intracranial content, often from cerebral edema, hemorrhage, or mass lesions, which reduces the available space in the rigid skull, leading to increased pressure on brain tissue.
• Secondary mechanism: The Monro-Kellie doctrine explains that the skull's fixed volume is occupied by brain tissue, blood, and cerebrospinal fluid (CSF). An increase in any of these components without compensation from the others results in ICP elevation, as the compensatory mechanisms (like CSF displacement) become overwhelmed.
• Key complication: Raised ICP can lead to cerebral ischemia by compressing cerebral blood vessels, reducing perfusion, and potentially resulting in herniation syndromes, where brain tissue is forced across structures within the skull, causing significant neurological damage or death.
Patient Profile
Demographics:
45-year-old female, teacher
History:
• Key past medical history: Hypertension, type 2 diabetes
• Current medications: Lisinopril, Metformin, Aspirin
• Allergies: Penicillin
Current Presentation:
• Chief complaint: Persistent headache and visual disturbances
• Key symptoms: Nausea, dizziness, blurred vision, occasional vomiting
• Vital signs: Blood pressure 160/95 mmHg, heart rate 88 bpm, respiratory rate 18 breaths per minute, temperature 37.2°C, oxygen saturation 95% on room air
Section 1
As the nurse conducts an initial assessment, further details emerge that suggest a potential exacerbation of the patient's condition. The patient is now exhibiting increasing confusion and disorientation, struggling to recall recent events, which raises concern about worsening cerebral function due to elevated ICP. A focused neurological examination reveals sluggish pupillary response on the left side, and a slight right-sided weakness is observed during motor strength testing. These findings are indicative of potential localized pressure effects, possibly due to a mass effect or edema.
To better understand the underlying cause of the elevated ICP, a CT scan of the head is ordered. The radiology report reveals a small left-sided subdural hematoma with associated midline shift. This finding is significant as it suggests that the hematoma is contributing to the increased intracranial pressure and the patient's deteriorating neurological status. The presence of a midline shift is particularly concerning, as it indicates that the brain tissue is being displaced from its normal position, posing a risk for further complications such as herniation.
Given these findings, the healthcare team must urgently consider interventions to reduce the ICP and address the underlying cause of the subdural hematoma. Possible interventions could include medical management with osmotic diuretics to reduce cerebral edema, or surgical options such as burr hole drainage or craniotomy to evacuate the hematoma. The decision-making process will involve weighing the risks and benefits of each intervention, considering the patient's overall health status and potential for recovery. The next steps will be critical in preventing further neurological decline and improving the patient's prognosis.
Section 2
As the medical team deliberates on the best course of action, osmotic diuretics are administered to the patient in an attempt to reduce cerebral edema and alleviate the elevated intracranial pressure. The patient's vital signs are closely monitored; the blood pressure has increased to 160/95 mmHg, heart rate is slightly elevated at 105 beats per minute, and respiratory rate is at 22 breaths per minute. These changes suggest a potential sympathetic nervous system response, possibly due to the increased ICP. The team remains vigilant for any signs of Cushing's triad, which would further complicate the clinical picture.
Despite initial medical management, the patient's neurological status continues to decline. The confusion persists, and the right-sided weakness has become more pronounced, with decreased grip strength and inability to lift the right arm against gravity. The sluggish pupillary response on the left side has not improved, raising concerns about the effectiveness of conservative measures. A repeat CT scan is urgently obtained, revealing that the size of the subdural hematoma has increased, with further midline shift noted.
Given these developments, the team recognizes the necessity of surgical intervention to prevent irreversible damage. A neurosurgical consultation is promptly initiated, and plans for a burr hole drainage are made to evacuate the hematoma and relieve pressure. The decision is made with careful consideration of the patient's age, overall health, and potential for recovery, aiming to prevent further neurological decline and optimize the patient's outcome. As the patient is prepped for surgery, the team prepares for potential intraoperative and postoperative challenges, emphasizing the importance of continuous monitoring and timely intervention in the critical care setting.
Section 3
As the patient is prepared for surgery, the team is alerted to a sudden change in the patient's status. The patient's heart rate has become irregular, with episodes of bradycardia dropping to 55 beats per minute, raising immediate concern for possible Cushing's triad, an ominous sign indicating worsening intracranial pressure. The blood pressure fluctuates, with systolic levels occasionally spiking above 180 mmHg, while the diastolic remains elevated. The respiratory pattern has changed to intermittent periods of apnea, necessitating urgent intervention to secure the airway and ensure adequate ventilation.
While the surgical team expedites the procedure, the critical care team orders a set of arterial blood gases (ABGs) and additional labs to assess the patient's metabolic status. The ABGs reveal a mixed respiratory and metabolic acidosis, with a pH of 7.25, PaCO2 of 50 mmHg, and HCO3- of 18 mEq/L. These findings suggest impaired ventilation and possible hypoperfusion, likely secondary to the increased intracranial pressure and altered hemodynamics. Serum electrolytes show a sodium level of 150 mEq/L, consistent with the effect of osmotic diuretics and necessitating careful monitoring to avoid further complications.
As the patient is transferred to the operating room, the nursing team remains vigilant, focusing on maintaining hemodynamic stability and preventing further deterioration. Continuous monitoring of vital signs and neurological status is emphasized, with a plan to reassess postoperatively for any changes in mental status, motor function, and pupillary response. The team prepares for the possibility of additional interventions, such as hypertonic saline administration or mechanical ventilation adjustments, to address the evolving clinical picture and support the patient's recovery trajectory.
Section 4
As the patient settles into the operating room, the nursing team conducts a thorough initial assessment to establish a baseline before the surgical intervention. The patient presents with a Glasgow Coma Scale (GCS) score of 8, indicating severe impairment. Pupillary examination reveals anisocoria, with the left pupil notably larger and sluggishly reactive to light, suggesting potential herniation. Motor response is asymmetrical, with the right side demonstrating decerebrate posturing, a concerning sign of brainstem involvement. Vital signs remain precarious, with blood pressure persistently elevated at 186/100 mmHg, heart rate fluctuating between 52 and 62 beats per minute, and an oxygen saturation of 88% on supplemental oxygen, indicating the urgent need for improved ventilation.
During the surgical preparation, a new set of diagnostic imaging, including a CT scan, is expedited and reveals significant midline shift and compression of the ventricles, consistent with the increasing intracranial pressure. These findings align with the clinical picture of Cushing's triad and the patient's deteriorating neurological status. The surgical team, in collaboration with the critical care specialists, discusses the potential for interventions such as decompressive craniectomy or the placement of an external ventricular drain to alleviate the pressure and address the underlying cause of the patient's rapid decline.
In response to these developments, the multidisciplinary team implements immediate interventions to stabilize the patient. The decision is made to administer hypertonic saline to draw fluid from the brain tissue and reduce cerebral edema. The ventilator settings are adjusted to optimize carbon dioxide removal, aiming to decrease PaCO2 levels and counteract the respiratory acidosis. As these measures are put into place, the patient begins to show slight improvement in oxygen saturation, and the heart rate stabilizes modestly. The nursing team meticulously documents these changes, ready to provide continuous monitoring and support as the patient progresses through surgery, with the hope of mitigating further complications and facilitating a favorable outcome post-operatively.
Section 5
As the surgical team proceeds with the decompressive craniectomy, the nursing staff continues to monitor the patient's response to the implemented interventions. While the administration of hypertonic saline and adjustments to the ventilator settings initially seemed promising, a new complication arises. The patient's blood pressure, previously elevated, begins to fall precipitously, now measuring 98/60 mmHg, raising concerns of possible hypovolemic shock or autonomic dysregulation. Concurrently, the heart rate increases to 110 beats per minute, further indicating a compensatory physiological response to the sudden drop in blood pressure.
In addition to these hemodynamic changes, the patient's neurological status shows signs of further compromise. The Glasgow Coma Scale score has decreased to 6, with a more pronounced lack of responsiveness to verbal commands and pain stimuli. The anisocoria persists, with the left pupil now becoming fixed and dilated, a troubling sign of unrelieved intracranial pressure despite surgical efforts. As the team reassesses, the decision is made to administer a bolus of fluids to address the potential hypovolemia while closely monitoring for any signs of fluid overload or worsening cerebral edema.
These developments prompt a re-evaluation of the patient's overall status and the effectiveness of the current treatment plan. The critical care team considers additional measures, such as initiating vasopressor support to stabilize blood pressure and reassessing the adequacy of cerebral perfusion pressure. The nursing team continues to provide vigilant monitoring, adjusting care plans in real-time and communicating with the interdisciplinary team to address these new challenges. The patient's journey through recovery remains uncertain, with the immediate focus on stabilizing vital signs and preventing further neurological deterioration.