1.2 Nursing Process, Clinical Assessment & Vital Signs
Key Takeaways
- The Nursing Process is a systematic, five-step framework: Assessment, Diagnosis, Planning, Implementation, and Evaluation (ADPIE).
- Clinical assessment requires both subjective data (patient symptoms) and objective data (measurable signs like vital signs and lab results).
- Normal adult vital signs: Oral Temp 36.5-37.5°C, Heart Rate 60-100 bpm, Respiratory Rate 12-20 breaths/min, Blood Pressure <120/80 mmHg, SpO2 95-100%.
- Physical examination utilizes four primary techniques: Inspection, Palpation, Percussion, and Auscultation, performed sequentially (except for abdominal exams).
- Pain is considered the 'fifth vital sign' and must be comprehensively assessed using tools like the numeric rating scale or faces scale.
The Nursing Process and Clinical Assessment
The Nursing Process (ADPIE)
The nursing process is the scientific, systematic method used by nurses to deliver patient-centered care. It ensures that interventions are evidence-based, goal-oriented, and continuously adapted to the patient's changing condition. This systematic approach is universally recognized and serves as the conceptual backbone for clinical decision-making across all specialties. The process consists of five interrelated phases:
- Assessment: The deliberate and systematic collection of data. This includes conducting a comprehensive health history, performing a physical examination, and reviewing diagnostic/laboratory results. Assessment is the first and most crucial step; without accurate data, subsequent steps will be flawed.
- Diagnosis: Analyzing the collected data to identify actual or potential health problems. Nursing diagnoses focus on the patient's human response to illness, differentiating them from medical diagnoses. For example, a medical diagnosis might be 'Pneumonia,' whereas a corresponding nursing diagnosis could be 'Impaired Gas Exchange.'
- Planning: Establishing measurable, attainable, and time-bound goals (outcomes) and selecting specific nursing interventions to achieve these goals. Planning involves prioritizing diagnoses, often using frameworks like Maslow’s Hierarchy of Needs or the ABCs (Airway, Breathing, Circulation).
- Implementation: Executing the care plan. This includes direct patient care, medication administration, health education, and collaboration with the interdisciplinary healthcare team. Implementation requires strong clinical skills and critical thinking to adjust care safely.
- Evaluation: Determining the patient's progress toward the established goals and modifying the care plan if the outcomes were not met. Evaluation is an ongoing process that determines whether interventions should be continued, altered, or discontinued entirely.
Clinical Assessment: Gathering the Data
Effective assessment relies on distinguishing between two types of data:
- Subjective Data (Symptoms): Information perceived and reported by the patient or their family (e.g., "My chest hurts," "I feel nauseous," or pain ratings on a numerical scale). This data cannot be directly observed but is vital for understanding the patient's experience.
- Objective Data (Signs): Measurable, observable data obtained through examination, vital signs, and diagnostic testing (e.g., Blood pressure of 140/90 mmHg, diaphoresis, hemoglobin of 10 g/dL). This data provides concrete, empirical evidence of the patient’s physical status.
Physical Examination Techniques
Nurses utilize four primary techniques during a physical assessment. They are typically performed in the following sequence, with one critical exception:
- Inspection: Visual examination of the body for size, shape, color, symmetry, and abnormalities. This step requires adequate lighting and careful, unhurried observation.
- Palpation: Using the hands to feel for texture, temperature, moisture, masses, and tenderness. Light palpation evaluates surface characteristics, while deep palpation assesses underlying organs.
- Percussion: Tapping the body surface to produce sounds that indicate the density of underlying tissues (e.g., dullness over the liver, resonance over healthy lungs, hyperresonance over hyperinflated lungs).
- Auscultation: Listening to sounds produced by the body, usually with a stethoscope (e.g., heart, lung, and bowel sounds). The bell of the stethoscope is used for low-pitched sounds (like some heart murmurs), while the diaphragm is used for high-pitched sounds (like lung sounds).
Important Exception: For abdominal assessments, the sequence MUST be altered to Inspection, Auscultation, Percussion, and Palpation. Palpating or percussing the abdomen first can alter bowel sounds, leading to inaccurate auscultation findings.
Vital Signs: The Baseline Indicators
Vital signs reflect the body's physiologic status and provide critical baseline data. Accuracy in measurement and interpretation is paramount. Nurses must instantly recognize abnormal values and respond appropriately.
1. Temperature
Normal core body temperature reflects the balance between heat production and heat loss.
- Normal Adult Range (Oral): 36.5°C to 37.5°C (97.7°F to 99.5°F).
- Fever (Pyrexia): Typically defined as an oral temperature > 38.0°C (100.4°F).
- Routes: Oral, Tympanic, Axillary (usually 0.5°C lower than oral), Rectal (usually 0.5°C higher than oral), and Temporal.
2. Heart Rate (Pulse)
The pulse represents the tactile arterial palpation of the heartbeat.
- Normal Adult Range: 60 to 100 beats per minute (bpm).
- Tachycardia: > 100 bpm (causes include fever, pain, anxiety, hypovolemia, hypoxia).
- Bradycardia: < 60 bpm (causes include medications like beta-blockers, athletic conditioning, hypothyroidism).
- Assessment: Note the rate, rhythm (regular or irregular), and amplitude (0 = absent, 2+ = normal, 4+ = bounding).
3. Respiratory Rate
Respiration involves the exchange of oxygen and carbon dioxide.
- Normal Adult Range: 12 to 20 breaths per minute.
- Tachypnea: > 20 breaths/min.
- Bradypnea: < 12 breaths/min.
- Assessment: Observe the rate, depth, and effort without making the patient explicitly aware you are counting, as this can alter their breathing pattern.
4. Blood Pressure
Blood pressure is the force exerted by circulating blood against the walls of the arteries.
- Normal Adult Range: Systolic < 120 mmHg AND Diastolic < 80 mmHg.
- Elevated: Systolic 120-129 mmHg AND Diastolic < 80 mmHg.
- Hypertension Stage 1: Systolic 130-139 mmHg OR Diastolic 80-89 mmHg.
- Hypertension Stage 2: Systolic ≥ 140 mmHg OR Diastolic ≥ 90 mmHg.
- Measurement Considerations: Ensure the patient is rested, seated with feet flat, and the appropriate cuff size is used. A cuff that is too small will falsely elevate the reading. A cuff that is too large will yield a falsely low reading.
5. Oxygen Saturation (SpO2)
Pulse oximetry provides a non-invasive estimate of arterial blood oxygen saturation.
- Normal Range: 95% to 100%.
- Hypoxia Indicator: Values below 90% are a clinical emergency requiring immediate intervention (e.g., supplemental oxygen, positioning).
- Interfering Factors: Nail polish, cold extremities, poor perfusion, and carbon monoxide poisoning (which can cause falsely high readings).
6. Pain (The Fifth Vital Sign)
Pain is a subjective experience and is exactly what the patient says it is.
- Assessment Tools: Numeric Rating Scale (0-10) for cognitively intact adults; FACES scale for children or non-verbal adults; FLACC scale for infants.
- PQRSTU Mnemonic: Provocation/Palliation, Quality, Region/Radiation, Severity, Timing, and Understanding (patient's perception of the problem).
Thorough mastery of the nursing process and clinical assessment forms the bedrock of safe nursing practice and is heavily tested on licensing examinations.
A nurse is preparing to assess a patient's abdomen who complains of severe stomach pain. Which of the following represents the correct sequence for physical examination of the abdomen?
A patient's vital signs are recorded as: Temperature 38.2°C, Pulse 115 bpm, Respirations 24 breaths/min, and Blood Pressure 108/60 mmHg. Which set of medical terms accurately describes this patient's current status?
During a routine assessment, the nurse takes a patient's blood pressure using a cuff that is significantly too small for the patient's arm. How will this error likely affect the blood pressure reading?