Vital signs are the fundamental indicators of human life and physiological function. In midwifery practice across Nigeria, assessing these parameters accurately is often the first line of defense in identifying complications during pregnancy, labor, and the puerperium. A baseline measurement provides the reference point against which all future readings are compared.
Whenever a woman presents to the clinic or maternity ward, taking her vital signs establishes her current health status. Changes in these numbers frequently appear before clinical symptoms become obvious. Midwives must understand that factors like anxiety, physical exertion, and environmental temperature can alter these readings temporarily, requiring a calm environment before measurement.
Body temperature reflects the balance between heat produced and heat lost by the body, regulated by the hypothalamus. In clinical settings, midwives use different routes to measure temperature: oral, tympanic, axillary, and occasionally rectal.
Fever, or pyrexia, often signals an underlying infection such as malaria or puerperal sepsis, both of which require prompt medical attention.
The pulse is the palpable wave of blood flow created by the contraction of the left ventricle. When assessing a pulse, the midwife evaluates three main characteristics: rate, rhythm, and volume.
The radial pulse at the wrist is standard, but in emergency situations or when circulation is compromised, the carotid or femoral pulse is assessed.
Respiration is the process of gas exchange, consisting of inspiration and expiration. Midwives must assess respirations discreetly—often by watching chest movements while pretending to still take the pulse—because patients tend to alter their breathing pattern when they realize it is being watched.
Normal resting respiration for an adult is 12 to 20 breaths per minute. Beyond counting the rate, the midwife observes the character: depth (shallow or deep), effort (use of accessory muscles), and sound (wheezing or stridor). Tachypnea, an abnormally fast respiratory rate, is frequently an early warning sign of shock, respiratory distress, or severe metabolic acidosis.
Blood pressure measures the lateral force exerted by flowing blood on the walls of arteries. It is recorded in millimeters of mercury (mmHg) as systolic over diastolic pressure.
Accurate measurement requires selecting the correct cuff size. A cuff that is too small gives a falsely high reading, while one that is too large gives a falsely low reading. The inflatable bladder should encircle at least eighty percent of the patient's arm. The midwife places the stethoscope bell lightly over the brachial artery in the antecubital fossa, inflates the cuff until pulsation disappears, and listens for the Korotkoff sounds as air is slowly released.
Recording vital signs accurately in the patient's chart is a legal and clinical necessity. Numbers must be entered immediately rather than memorized and written down later. Trends over time are far more valuable than a single isolated reading.
Midwives must remain vigilant for critical deviations—such as a sudden drop in blood pressure accompanied by a rapid pulse, which points toward hemorrhagic shock. Recognizing these warning signs early allows for rapid escalation of care, timely medical review, and potentially life-saving interventions in obstetric emergencies.