Cerebrospinal Fluid Gravity Correlation Analysis

Study Overview
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Brief Summary
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The purpose of this study was to measure cerebrospinal fluid density in aged patients and to see if there was a correlation between these factors and cerebrospinal fluid density by using the electronic medical record system to understand the patient's gender, blood glucose, blood biochemical electrolytes and blood levels.

Detailed Description
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Hip joint injury is one of the common injuries in the elderly, and hip arthroplasty is a treatment method that allows patients to get out of bed and return to social life as soon as possible. Currently, the common position for hip arthroplasty is the lateral position; and combined spinal and epidural anesthesia or subarachnoid anesthesia is also the common anesthesia method for hip arthroplasty. In the lateral position, the patient's affected limb is often on top and the healthy limb is on the bottom; the healthy side position is also the usual position for hip arthroplasty. In this position, it may be optimal to use a lighter specific gravity local anesthetic drug because it tends to anesthetize only the upper affected limb and does not require a return to the supine position after anesthesia due to changes in the plane of block, minimizing pain and hemodynamic fluctuations during anesthesia and position changes. Currently, light specific gravity is more of a concept. Because in the available data, only the range of cerebrospinal fluid density of ordinary healthy adults is available, there is little literature and data to describe and analyze what the cerebrospinal fluid density of elderly patients actually is. Therefore, when we administer subarachnoid anesthesia to elderly patients, we cannot determine whether the dispensed local anesthetic drug is a light specific gravity. In this study, we intend to collect cerebrospinal fluid from elderly patients who underwent hip arthroplasty under combined lumbar and rigid anesthesia or subarachnoid anesthesia, and measure the cerebrospinal fluid density in elderly patients, and observe whether there is a correlation between the above factors and cerebrospinal fluid density through the electronic medical record system to understand the patient's gender, blood glucose, blood biochemical electrolytes and routine blood levels; thus, we can better guide the use of lighter specific gravity drugs in clinical practice.

Official Title
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Correlation Between Blood Biochemical Indicators and Cerebrospinal Fluid Gravity in Aged Patients

Conditions
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Specific Gravity, Cerebrospinal Fluid

Intervention / Treatment
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* Diagnostic Test: Cerebrospinal fluid densitometry
* Diagnostic Test: blood routine examination
* Diagnostic Test: Blood electrolyte examination


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Receiving combined spinal and epidural anesthesia or subarachnoid anesthesia ASA Ⅰ or Ⅱ patients No significant neurological pathology No recent history of cerebral infarction No recent history of cerebral hemorrhage No central nervous system inflammation No spinal inflammatory disease No history of spinal surgery Patients who have given pre-operative informed written consent Exclusion Criteria: -

Ages Eligible for Study
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Minimum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Group A<br>Patients were aged 60-69 years | Diagnostic Test: Cerebrospinal fluid densitometry<br>* After obtaining the patient's cerebrospinal fluid specimen, the actual mass of the cerebrospinal fluid was measured by pipetting 1000 μL of cerebrospinal fluid specimen on an analytical balance using a pipette gun, and all specimens were measured three times and the average of the three times was taken as the final mass of 1000 μL of that specimen. After the mass measurement, the residual cerebrospinal fluid was disposed of as medical waste. The density of each specimen was obtained according to the density to mass conversion formula ρ=m/v.<br>Diagnostic Test: blood routine examination<br>* After obtaining the patient's blood specimens, they were sent to the laboratory for blood routine examination.<br>Diagnostic Test: Blood electrolyte examination<br>* After obtaining the patient's blood specimens, they were sent to the laboratory for blood electrolyte examination.<br>|
| Group B<br>Patients were aged 70-79 years | Diagnostic Test: Cerebrospinal fluid densitometry<br>* After obtaining the patient's cerebrospinal fluid specimen, the actual mass of the cerebrospinal fluid was measured by pipetting 1000 μL of cerebrospinal fluid specimen on an analytical balance using a pipette gun, and all specimens were measured three times and the average of the three times was taken as the final mass of 1000 μL of that specimen. After the mass measurement, the residual cerebrospinal fluid was disposed of as medical waste. The density of each specimen was obtained according to the density to mass conversion formula ρ=m/v.<br>Diagnostic Test: blood routine examination<br>* After obtaining the patient's blood specimens, they were sent to the laboratory for blood routine examination.<br>Diagnostic Test: Blood electrolyte examination<br>* After obtaining the patient's blood specimens, they were sent to the laboratory for blood electrolyte examination.<br>|
| Group C<br>Patients were aged 80-89 years | Diagnostic Test: Cerebrospinal fluid densitometry<br>* After obtaining the patient's cerebrospinal fluid specimen, the actual mass of the cerebrospinal fluid was measured by pipetting 1000 μL of cerebrospinal fluid specimen on an analytical balance using a pipette gun, and all specimens were measured three times and the average of the three times was taken as the final mass of 1000 μL of that specimen. After the mass measurement, the residual cerebrospinal fluid was disposed of as medical waste. The density of each specimen was obtained according to the density to mass conversion formula ρ=m/v.<br>Diagnostic Test: blood routine examination<br>* After obtaining the patient's blood specimens, they were sent to the laboratory for blood routine examination.<br>Diagnostic Test: Blood electrolyte examination<br>* After obtaining the patient's blood specimens, they were sent to the laboratory for blood electrolyte examination.<br>|
| Group D<br>Patient age > 90 years | Diagnostic Test: Cerebrospinal fluid densitometry<br>* After obtaining the patient's cerebrospinal fluid specimen, the actual mass of the cerebrospinal fluid was measured by pipetting 1000 μL of cerebrospinal fluid specimen on an analytical balance using a pipette gun, and all specimens were measured three times and the average of the three times was taken as the final mass of 1000 μL of that specimen. After the mass measurement, the residual cerebrospinal fluid was disposed of as medical waste. The density of each specimen was obtained according to the density to mass conversion formula ρ=m/v.<br>Diagnostic Test: blood routine examination<br>* After obtaining the patient's blood specimens, they were sent to the laboratory for blood routine examination.<br>Diagnostic Test: Blood electrolyte examination<br>* After obtaining the patient's blood specimens, they were sent to the laboratory for blood electrolyte examination.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Cerebrospinal fluid density | After obtaining the mass of cerebrospinal fluid, the density was calculated from ρ=m/v | baseline (before anesthesia) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Blood sugar | Plasma glucose level | baseline (before anesthesia) | 
| Plasma K+ concentration | Plasma K+ concentration | baseline (before anesthesia) | 
| Plasma Cl- concentration | Plasma Cl- concentration | baseline (before anesthesia) | 
| WBC | Leukocyte concentration in blood | baseline (before anesthesia) | 
| Neutrophil concentration in blood | Neutrophil concentration in blood | baseline (before anesthesia) | 
| Lymphocyte concentration in blood | Lymphocyte concentration in blood | baseline (before anesthesia) | 
| C-reactive protein (CRP) | C-reactive protein concentration in plasma | baseline (before anesthesia) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Cerebrospinal fluid, Correlation Analysis, Lighter Specific Gravity