An exact time-frame of what rapid progression is should not be offered since progression may be associated with wide range of potential etiologies. in low- and middle-income countries; south-central Asian countries experience the highest absolute numbers of neonatal deaths, while countries in sub-Saharan Africa generally have the highest rates of neonatal mortality[2]. Respiratory distress is one of the most common problems neonates encounter within the first few days of life[3]. According to the American Academy of Pediatrics, approximately 10% of neonates need some assistance to start breathing at birth, with up to 1% requiring extensive resuscitation[4].

Other reports confirm that respiratory distress is common in neonates and occurs in approximately 7% of babies during the neonatal period[3],[5]. Respiratory disorders are the leading cause of early neonatal mortality (07 days of age)[6], as well as the leading cause of morbidity in newborns[7], and are the most frequent cause of admission to the special care nursery intended for both term and preterm infants[8]. In fact , neonates with respiratory distress are 24 times more likely to die than neonates without respiratory distress[9].

Respiratory distress describes a symptom complex representing a heterogeneous group of illnesses[3]. As such, respiratory distress is often defined as a clinical picture based on observed signs and symptoms irrespective of etiology[7],[10]. Clinical symptoms most commonly cited as indicators of respiratory distress include tachypnea[3],[7],[8],[10],[11],[12],[13],[14],[15],[16],[17], nasal flaring[3],[7],[8],[10],[11],[12],[13],[14],[15],[17], grunting[3],[7],[8],[10],[11],[12],[13],[14],[15],[16],[17], retractions[3],[7],[8],[10],[11],[12],[13],[14],[15],[16],[17](subcostal, intercostal, supracostal, jugular), and cyanosis[3],[7],[8],[10],[11],[13],[17].

Other symptoms include apnea[3],[8], bradypnea[8], irregular (seesaw) breathing[8],



inspiratory stridor[3],[16], wheeze[16]and hypoxia[8],[14]. Tachypneain the newborn is defined as a respiratory rate of more than 60 breaths per minute[12],[15], bradypneais a respiratory rate of less than 30 breaths per minute, whileapneais a cessation of breath for at least 20 s[18]. Apnea may also be defined as cessation of breath for less than 20 s in the presence of bradycardia or cyanosis[18].

Nasal flaringis a TSPAN11 compensatory symptom that is caused by contraction of alae nasi muscles, increases upper airway diameter and reduces resistance and work of breathing[8],[12],[15]. Stridoris a high-pitched, musical, monophonic inspiratory breath sound that indicates obstruction at the larynx, glottis, or subglottic area[15]. Wheezingis a high-pitched, whistling, expiratory, polyphonic Risedronic acid (Actonel) sound that indicates tracheobronchial obstruction[15].

Gruntingis an expiratory sound caused by sudden closure of the glottis during expiration in an attempt to increase air passage pressure and lung volume, and to prevent alveolar atelectasis[8],[12],[15]. Retractionsoccur when lung compliance is poor or airway resistance is high, result from Risedronic acid (Actonel) unfavorable intrapleural pressure generated by contraction of the diaphragm and accessory chest wall muscles, and are clinically evident by the use of accessory muscles in the neck, rib cage, sternum, or abdomen[8],[15]. Finally, cyanosisis assessed by examining the oral mucosa intended for blue or gray discoloration and suggests inadequate gas exchange,



whilehypoxemiais signified by an oxygen saturation of less than 90% after 15 min of life[8].

Pathophysiology of respiratory distress in the neonate Most causes of respiratory distress result from an Risedronic acid (Actonel) inability or delayed ability of a neonates lungs to adapt to their new setting[14]. In utero, the lungs are fluid filled, receive less than 1015% of the total cardiac output, and oxygenation occurs through the placenta[8],[19],[20],[21]. For the neonate to transition, effective gas exchange must be established[8],[22], alveolar spaces must be cleared of fluid and ventilated[20],[21], and pulmonary blood flow must increase to match ventilation and perfusion[14],[23].

A small proportion of alveolar fluid is cleared by Starling forces and vaginal squeeze[14],[23], however the overall process is Risedronic acid (Actonel) complex, and entails rapid removal of fluid by ion transport across the airway and pulmonary epithelium[8],[20],[23]. Peak expression of these ion channels in the back epithelium is achieved at term gestation, leaving preterm infants with a reduced ability to clear lung fluid after birth[14]. If ventilation or perfusion is inadequate, the neonate develops respiratory distress[14],[23].

In utero, high pulmonary vascular resistance directs blood from the right side of the heart through the ductus arteriosus into the aorta[8]. When the umbilical vessels are clamped at birth the low-resistance placental circuit is removed, systemic blood pressure is increased, and the pulmonary vasculature relaxes[8],[20]. Expansion of the lungs and increase in PaO2 results in increased pulmonary blood flow and constriction of the ductus arteriosus[8],[21].

Cardiopulmonary transition is completed after approximately 6 h[8]. The neonates respiratory pattern may initially be irregular, but soon becomes rhythmic at a rate of 4060.

📌 An exact time-frame of what rapid progression is should not be offered since progression may be associated with wide range of potential etiologies (Amberpet)
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