Current Researches in Anesthesia and Analgesia-July-August, 1953 A Proposal for a’New Method of Evaluation.of the Newborn Infant.* Virginia Apgar, M.D., New York, N. Y . Department of Anesthesiology, Columbia University, College of Physioians and Surgeons and the Anesthesia Service, The Presbyterian Hospital ESUSCITATION OF I N F A N T S a t birth has been the subject of many articles. Seldom have there been such imaginative ideas, such enthusiasms, and dislikes, and such unscientific observations and study about one clinical picture. There are outstanding exceptions to these statements, but the poor quality and lack of precise data of the majority of papers concerned with infant resuscitation are interesting. There are several excellent review articles1 but the main emphasis in the past has been on treatment of the asphyxiated or apneic newborn infant. The purpose of this paper is the reestablishment of simple, clear classification or “grading” of newborn infants which can be used as a basis for discussion and comparison of the results of obstetric practices, types of maternal pain relief and the effects of resuscitation. T h e principle of giving a “score” to a patient as a s u m total of several objective findings is not new and has been used recently in judging the treatment of drug a d d i ~ t i o n .T~h e endpoints which have been used previously in the field of resuscitation are “breathing time” defined as the time from delivery of the head t o the first respiration, and “crying time” the time until the establishment of a satisfactory Other workers have used the terms mild, moderate and severe depression5 to signify the state of the infant. There are valid objections to these systems. When mothers receive an excessive amount of depressant drugs in the antepartum period, it is a common occurence that the infants breathe once, then become apneic for many minutes. Evaluation of the breathing time is difficult. A satisfactory cry is sometimes not established even when the infant leaves t h e delivery room, and in some patients with cerebral injury, the baby dies without ever having uttered a satisfactory cry. Mild, moderate and severe depression of the infant leaves a fair margin for individual interpretation. A list was made of all the objective signs which pertained in any way to the condition of the infant a t birth. Of these, five signs which could be determined easily and without interfering with the care of the infant were considered useful. A rating of zero, one or two, was given to each sign depending on whether it was absent or present. A score of ten indicated a baby in the best possible condition. The time for judging the five objective signs was varied until the most practi“Presented before the Twenty-Seventh Annual Congress of Anesthetists, Joint Meeting of the International Anesthesia Research Society and the International College of Anesthetists, Virginia Beach, Va., September 22-25, 1952. 260 Evaluation of Newborn-Apgar cable and useful time was found. This is sixty seconds after the complete birth of the baby. Insofar as possible, the rating was done by two observers only, but as the series progressed, the score as determined by the anesthesia resident present at the delivery was found to be sufficiently accurate. These ratings have been included in the present series. The signs used are as follows: (1) Heart Rate.-This was found to be the most important diagnostic and prognostic of the five signs. A heart rate of 100-140 was considered good and given a score of two, a rate of under 100 received a score of one, and if no heart beat could be seen, felt or heard the score was zero. If one attends the baby alone, it is easy to learn to look briefly a t the epigastrium or precordium for visible heart beat, while palpation of the cord about two inches from the umbilicus is the most satisfactory method for. determining the heart rate quickly, and avoids the area of clamping or tying of the cord. It is of great assistance to the person caring for the baby to have an assistant demonstrate by motion of a finger of one hand the heart rate as palpated by the other hand. In only three cases was a heart rate of over 140 detected, accompanied by arrhythmia in two of these infants. I was puzzled a s to the proper way to rate this in these patients, but they were given a full score of two points. The tachycardia and arrhythmias were apparently related to an overdosage of a vasopressor drug during spinal anesthesia for cesarean section. (2) Respiratory Effort.-An infant who was apneic at 60 seconds after birth received a score of zero, while one who breathed and cried lustily received a two rating. All other types of respiratory efforty* such as irregular, shallow ventilation were scored one. An infant who had gasped once a t thirty or forty-five seconds after birth, and who then became apneic, received a zero score, since he was apneic at the time decided upon for evaluation. (3) Reflex Irritability.-This term refers to response to some form of stimulation. The usual testing method was suctioning the oropharynx and nares with a soft rubber catheter which called forth a response of facial grimaces, sneezing or coughing. Although spontaneous micturition and defecation are not a response to an applied stimulus, they were considered to be favorable signs if they occurred. (4) Muscle Tone.-This was an easy sign to judge, for a completely flaccid izfant received a zero score, and one with good tone, and spontaneously flexed arms and legs which resisted extension were rated two points. W e are unable to agree with Flagg’s description of spasticitys as a sign of asphyxiation of the infant. The use of analeptics in the baby did not influence this score because of the standardized early time of observation and rating. ( 5 ) Color.-This is by far the most unsatisfactory sign and caused the most discussion among the observers. All infants are obviously cyanotic a t birth because of their high capacity for carrying oxygen and their relatively low oxygen content and saturation.? The disappearance of cyanosis depends directly on two signs previously 261 Current Researches in Anesthesia and Analgesia-July-Augus. 1953 .- considered-respiratory effort and heart rate. Comparatively few infants were given a full score of two for this sign, and many received zero in spite of their excellent score for other signs. The foreign material so often covering the skin of the infant a t birth interfered with interpreting this sign; as did the inherited pigmentation of the skin of colored children, and an occasional congenital defect. Many children for reasons still mysterious t o us, persist in having cyanotic hands and feet for several minutes in spite of excellent ventilation, and added oxygen. A score of two was given only when the entire child was pink. Several hundred children were rated at three or five-minutes as well as at sixty seconds and in almost all cases a score of two could be given for color a t these later times. This finding agrees well with the heel blood oxygen studies in 402 infants, conducted a t Sloane Hospital during 1947-45.8 In an occasional instance the color was worse at five minutes than a t sixty seconds, and these cases were therefore missed with our usual method of evaluation. It has been most gratifying to note the enthusiastic interest and competitive spirit displayed by the obstetric house staff who took great pride in a baby with a high score. The same trend of interest has been noted in another hospital which has undertaken the ratings of babies in this manner.9 Material URING THE P E R I O D of this report (seven and one-half months) 2096 infants were born in the Sloane Hospital for Women. Eighty four per cent of the anesthesia records of these births are on file. The missing 16 per cent are chiefly those with pudendal blocks or “natural childbirth” patients. T h e omission of these cases is regrettable for they form the best control group for any study on infant resuscitation. Little attempt will be made to analyze these figures statistically for the groups are still too small for such treatment. 9 Seventeen hundred and sixty charts were available for study. Twenty-seven infants were stillbirths, or a rate of 1.5 per cent. One thousand and twenty-one of the infants born alive were rated by the method just described and comprise the data for this report. Seven hundred and twelve infants were not rated. Type of Delivery and Score No. Infants Low forcepe or spontaneous 843 Cesarean section Midforceps delivery Breech delivery Version and breech extraction 141 17 16 4 Average Score 8.4 6.8 6.9 6.7 6.3 The infants in the best condition one minute after birth are those born vaginally with the occiput the presenting part. T h e incidence of the use of low forceps in this clinic is 34 per cent and after a two 262 Evaluation of Newborn-Apgar year daily observation of routine deliveries it did not seem to be of value to separate the spontaneous deliveries from those in which low forceps were used. Delivery by any other means produced no difference in the infants. The score for aII these was slightly less favorable than those born spontaneously or with low forceps. Cesarean Sections.-The cesarean section rate at Sloane Hospital is 10.5 per cent during this period. The anesthesia methods for the 141 rated infants born by cesarean section are listed : - Infants 83 Spinal anesthesia General anesthesia Epidural or caudal 54 4 Average Score 8.0 5.0 6.3 The method used for spinal anesthesia was a single dose of nupercaine 0.25 per cent made hyperbaric with dextrose, in doses ranging from 6 to 7.5 mg., or pontocainea 0.3 per cent, hyperbaric, from 7 to 9 mg. A 22 gauge needle was used. No supplementary anesthesia was given to these patients until after the birth of the infant. General anesthesia in all cases was accomplished with cyclopropane and oxygen. In 20 cases to be discussed later a relaxant was used with cyclopropane. Fractional epidural or caudal anesthesia (0.75 per cent xylocaine@) was continued in 4 cases for cesarean section after a trial of labor. The indications for general anesthesia in cesarean section are thought to be a history of syphilis, septicemia, severe hemorrhage, or a history of traumatic experience with spinal anesthesia. Although this method does not take into account maternal risk or. antepartum fetal problems, it is apparent that the mothers of the potentially poor risk infants received spinal anesthesia. In spite of this and the frequent maternal hypotension, the condition of the infants after spinal anesthesia was definitely better than after general anesthesia. The average time for delivery of the infant after induction of general ansthesia was fourteen minutes and twenty-four minutes after the administration of spinal anesthesia. There is questionable support of the theory'O that infants who have been subjected to a trial of labor are in better condition than those in whom cesarean section was chosen electively, as indicated below. Infants 57 84 Patients in labor Patients not in labor Average Score 7.1 6.7 These small groups have been analyzed statistically1' and are not statistically significant. I n obstetric circles there has been the subtle impression that the lower the cesarean section rate in a clinic, the better was the practice of obstetrics. There is a slight trend away from this idea, and that at times even cesarean section is a conservative form of therapy;12 263 Current Researches in Anesthesia and Analgesia-July-August, 1953 W e have felt that with individual attention to-selection of anesthetic agents and their administration by competent anesthesiologists, that infant survival after elective cesarean section might be made as successful as after an uncomplicated vaginal delivery. That we have not yet reached this point is illustrated in the next table. The group of cesarean section patients who had no antepartum problems and in whom labor was not present (secondary and tertiary sections) was compared with a similar group of vaginal deliveries in whom no problems of any kind were apparent. All received spinal anesthesia. The condition of the infants delivered vaginally was better than those delivered by cesarean section. Infants 38 Normal, elective sections Normal, low forceps or spont. 38 Average Score 7.7 9.0 The most obvious difference between the two groups is the presence of labor in those delivered vaginally and the absence of labor in the section group. W e do not know whether this implies some beneficial effect of labor on respiration, circulation and general well-being of the infant. The experimental reports on the lack of placental transfer of d-tubocurarine, flaxedil,@ d e c a m e t h o n i ~ m ' ~l4 l5 l6 are intriguing. Several clinical reports seem to bear out this somewhat surprising finding. Other papers are in disagreement.l' I n an effort to test this possibility clinically, 20 patients received a relaxant intravenously as a means of keeping the patient from moving, accompanied by as light a plane of cyclopropane as would produce unconsciousness. Seventeen received d-tubocurarine, and 1 patient each received flaxedil,@succinylcholine and decamethonium bromide. Thirteen infants were rated. Sections: Cyclopropane without relaxant Sections: Cyclopropane with d a x a n t Infants 41 13 Average Score 5.0 5.0 . In addition to the fact that there was no difference in the infant's condition with or without the use as a relaxant, 70 per cent of the infants with relaxant needed oxygen administration in some form, while the number needing oxygen after cyclopropane anesthesia alone was likewise 70 per cent. The infants are not in better condition with relaxants and nothing is to be gained by the use of curare or similar drugs for cesarean section anesthesia. The occasional maternal respiratory depression necessitating assisted respiration is a distinct disadvantage to the technique. Breech Deliveries.-There were 16 cases of breech deliveries excluding twins and version and breech extraction. All but one who precipitated without anesthesia were anesthetized with general anesthesia in a plane as light as compatible with the obstetric maneuvers. Nitrous oxide, ethylene or cyclopropane were used for this purpose. The average score was 6.7, essentially the same as for cesarean section infants. Regional methods were not used in this small group. 264 Evaluation of Newborn-Apgar Twins.-Nine pair.s of twins were delivered by a variety of methods. The average score of the 18 babies was remarkably good, 8.6, and probably reflects the use of minimal medication during the first stage of labor. The use of regional anesthesia, however, again produced better results than general anesthesia in this small series. - Infants 14 4 Twins-eneral anesthesia Twins-regional anesthesia Average Score 8.2 9.8 The condition of the first twin was somewhat better than the second. Infants 9 9 Twin A Twin B Average Score 8.9 8.2 Midforceps Delivery.-The condition of the infants following midforceps delivery was the same as by section or by breech delivery. There was no difference relating to the anesthetic method. Infants 11 Midforceps, general anesthesia Midforceos. reeional anesthesia 6 Average Score 6.8 7.0 Low Forceps and Spontaneous Deliveries.-This large group showed some improvement in the infant’s condition following the use of regional anesthesia. Infants 692 25 102 24 General anesthesia Spinal anesthesia Epidural, caudal anesthesia Pudendal or no anesthesia Average Score 8.2 8.9 9.1 9.2 Prematurity H E R E W E R E 70 infants in this series whose birth weights were between 500 and 2500 grams. The nonviable premature infants, under 500 grams, were excluded and considered to be abortions. T h e youngest child who has survived in the Premature Nursery of the Babies Hospital weighed 580 grams. Regional anesthesia again was associated with a better score for the child. Infants 44 24 2 Premature, general anes. Premature, regional anes. Premature, no anes. ppt. Average Score 8.0 9.2 2.0 Resuscitation XYGEN, SUCTION, some method of positive pressure, endotracheal tubes and an infant laryngoscope are present in every delivery room. Oxygen was used freely if the infant’s condition was not good. The three types of administration used are: (1)‘ Face oxygen, in which method oxygen is added to inspired air, but without increase in pressure at the face. (2) .Positive pressure mask, in which a small mask is held snugly on the infant’s face, and some degree of positive pressure is applied -0 265 Current Researches in Anesthesia and Analgesia-July-August, 1953 to the pharynx. (3) Endotracheal oxygen, in which direct laryngoscopy is performed, additional suction used if necessary, and intubation accomplished. Positive pressure usually with added oxygen is implied in this method. T h e details of these methods and indications for their use as well a s discussion of other resuscitative measures will be the subject of other communications. Three hundred thirty six or 19.4 per cent of the 1733 living infants received oxygen by some method. Of this group 156 or 46 per cent received face oxygen. 111 or 33 per cent received positive pressure mask. 13 or 4 per cent received endotracheal oxygen. 56 or 17 per cent received an unspecified method. The survival rate following the use of endotracheal oxygen in this clinic over a 3 year period is between 60 and 70 per cent of the cases in which it has been employed. The incidence of the use of oxygen for the infant following the various routes of deliveries is as follows : ~ Cesarean section Midforceps Breech delivery Low forceps and spont. ~~~ 54 per cent 8 per cent 37 per cent 15 per cent I n 217 of 336 infants who received oxygen, ratings were obtained and the method of administration was recorded. Cases Face oxygen Positive pressure mask Endotracheal oxygen 117 90 10 Average Score 6.7 3.9 2.1 In 14 of the group of 117 cases receiving face oxygen, a score of 9 or 10 was given, and these infants undoubtedly did not need the oxygen so administered. Nematal Deaths HERE WERE 25 neonatal deaths in the entire group of 2096 deliveries, or a rate of 1.2 per cent. If the 38 stillbirths over 500 grams are included, the total fetal loss was 64 infants, or a rate of 3.0 per cent of total infants born. The distribution by type of delivery is as follows: G ~~ Cases Type Cesarean sectioii Breech deliveries Low, midforceps and spont. 220 54 1822 Neonatal Deaths 2 5 18 Per Cent of type 0.9 per cent 9.3 per cent 1 .O per cent Fourteen of the infants mho died were under 2500 Gm. birth weight, representing a mortality of 7.8 per cent of the total number of 266 Evaluation of Newborn-Apgar premature infants born alive. Of the 11 mature infants who died, all had obstetric or medical reasons for their deaths. In this series anesthesia complications apparently did not contribute to the death of any case. Twelve of the infants who later died were rated at birth and averaged 2.3 points. In order to check the approximate accuracy of the various scores, the fate of the infants in poor, fair and good condition was examined. After this initial experience, it seems to us that groups 8, 9, and 10 indicate infants in good condition, 0, 1, and 2, poor condition, and the remaining scores, fair condition. Infants receiving 0, 1 or 2 scores Deaths in this group 9 or 14 per cent Infants receiving 3, 4, 5, 6, 7 scores Deaths in this n - o u .o 2 or 1.1 oer cent Infants receiving 8, 9, 10 scores Deaths in this group 1 or 0.13 per cent 65 182 774 Thus, the prognosis of an infant is excellent if he receives one of the upper three scores, and poor if one of the lowest 3 scores. From this we may also conclude that color as a sign is relatively unimportant when observed one minute after birth. Summary PRACTICAL M E T H O D of evaluation of the condition of the C% newborn infant one minute after birth has been described. A rating of ten points described the best possible condition with two points each given for respiratory effort, reflex irritability, muscle tone, heart rate and color. Various applications of this method are presented. The author wishes to acknowledge gratefully the assistance and encouragement of H. C. Taylor, Jr.. M. D. The data were collected with the technical assistance of Rita Ruane, R.N. Bibliography Little D M., Jr. and Tovell, R. M.: Collective Review: A Physiological Basis for Resuscitatidn bf the Newhoin, I n t n n a t . Abstr. Surg. 86:417-428 (May) 1948. 2. Smith, C. A,: Effects of Birth Processes and Obstetric Procedure upon the Newborn Infant. Advances in Pediatrics. Interscienre Publishers. New York. 1948 vol. 3 chao. 1 vp 1-54. 3. Kolb, L and Himmelshach C. K.: Clinical Studies of Drug hddictiAn 111, Washington, Public Health R&orts. U. S. Treas.’ Dept., 1938, Supplement 128 pp. 23-31. 4. Hapke, F. B., and Barnes, A. C.: The Obstetric Use aAd Effecton Fetal Respiration of Nisentil,@ Am. I. Obst. 6.Gyner. 58:799-801 (Oft.) 1949. 5. Eckenhoff, J. E.: Hoffman, G. L.; and Dripps, R. D.: N-allyl Normorphine, an Antagonist to the Opiates, Anesthesiology 13 :242-251, (Nay) 1952. 6. Flagg, P.: The Art of Rescuscitation, New York, Reinhold Publishing Co. 1944, p. 124. 7. Eastman N. J.: Foetal Blood Studies. I. The Oxygen Relationships of’ the Umbilical Cord at Birth, B’ull. Johns Hopkins Hosp. 47:221-230, 1930. 8. Apgar, V.: Oxygen as Supportive Therapy in Fetal Anoxia, Bull. N . Y. Acad. Med. 26:Znd series. 474:478 ( T a-l.v,, l -195n ---. 9. Fleming: Personal communications. 10. Bloxsom A.: The Difficulty in Beginning Respiration Seen in Infants Delivered hp Cesarean Section, >. Pediat. 20:215-222 (Feb.) 1942. 11. Frumin, J. : Personal communication. 12. Harris J. M. et al.: The Case of Reevaluation of Indications for Cesarean Section, West. I. Surg. Sb:327-3;6, 1951. 13. Harroun, P., and Fisher, C. W.: The Physiological Effects of Curare, Surg., G y r c . 6. Obst. 89:73-75. 1949. 14. Y o u n g I. hf.: Abdominal Relaxation with Decamethonium Iodide During Cesarean section, Lancet i :1052-1053 1949. 15. McMann, W.: &are with General Anesthesia for Vaginal Deliveries, Am. I . Obst. 6 Gynec. 60:1366-1368 (Dec.) 1950. 16. BScurr, C.: A. Comparative Review of the Re1axants;Br. I. Anaesth. 23:103-116 (Apr.) 1 \I 1951. ~. 17. Davenport, H. T.: D-Tubocurarine Chloride for Cesarean Sections: Report of 210 Cases E?. 3. Anaesth. 23:66-80 (Apr.) 1951. 267