OPINION
Opinion by
This is an appeal by Charlene R. McIntyre, et al. (McIntyre) of a directed verdict rendered on behalf of C. Jack Smith, M.D., and Collom & Carney Clinic Association (C & C). McIntyre contends that the trial court erred in granting a directed verdict for Smith because there was legally sufficient evidence that Smith was negligent and that his negligence was the proxi *913 mate cause of Virgil McIntyre’s death. We sustain the sole point of error, and reverse and remand for a new trial on Smith’s alleged negligence.
On January 8, 1996, Virgil was hospitalized as a result of severe abdominal pain. Over the next few days, he was treated by a variety of doctors and underwent a series of surgeries, but his condition failed to improve. It was ultimately determined that Virgil would need to undergo Mdney dialysis. In preparation for dialysis, on January 19, 1996, Dr. H. Randall Schmidt, a board-certified general surgeon, inserted a central venous Quinton catheter into Virgil’s chest. In order to insert the catheter into the chest, Schmidt used a guide wire, commonly called a “J-wire,” and a dilator. If this type of catheter is properly placed, the tip of the catheter should be in the superior vena cava, a large vein in the chest. Schmidt confirmed correct placement of this catheter by successfully aspirating blood from the catheter, and by ordering and reviewing a chest x-ray of the catheter placement. Unless Virgil’s condition improved, dialysis was to begin the following day, supervised by a nephrol-ogist (a kidney specialist).
The next day, January 20, 1996, Smith was the nephrologist on duty. Smith examined Virgil and ordered dialysis around 1:30 in the afternoon. However, he received a telephone call around 2:30 or 3:00 indicating that the dialysis nurse could not get the catheter to work. Smith ordered a chest x-ray and compared this x-ray to the one that Schmidt had taken the day before. Smith determined that the catheter had not moved, and he then attempted to manipulate the catheter in an effort to aspirate blood. This attempt was unsuccessful, so Smith decided to replace the catheter. After the new catheter was in place, Smith again was unsuccessful in his attempt to aspirate blood, and he ordered a third chest x-ray. From evaluating the new x-ray with the prior two, he determined that the second catheter was in the same location as the first. Since Smith believed that Virgil needed dialysis, he decided to remove the chest catheter and insert a third catheter in Virgil’s leg. This catheter did function properly, and Smith administered Heparin, a blood thinner, and began dialysis. After observing Virgil for three to five minutes, Smith spoke with the family and then left for another hospital to treat another critical patient.
As soon as he reached the second hospital, he testified that he received a call from the dialysis nurse telling him that McIntyre’s blood pressure had dropped and that he was experiencing shortness of breath and chest pains. Smith ordered the nurse to administer additional fluids and to do some blood work, rather than take an additional chest x-ray, which the nurse had suggested. When the blood work was available, it showed that Virgil’s hematocrit level had decreased, and Smith told the nurse that he would return as soon as possible. However, approximately ten minutes later, before Smith had left the other hospital, he received a third call telling him that Virgil had gone into cardiac arrest.
Emergency surgery was performed on Virgil, and four liters of blood were removed from his chest. The surgeons who performed this procedure found a hole in the innominate vein in the location where the first and second Quinton catheters were placed. They repaired the hole, but due to the massive blood loss, Virgil was declared brain dead. His family chose to remove life support, and Virgil died.
McIntyre brought suit against Schmidt, Donald E. Duncan, M.D., 1 St. Michael Health Care Center, Southern Clinic, P.A., Smith, and C & C, alleging negligent and grossly negligent medical care of Virgil. The case was tried before a jury, and at the close of both the plaintiffs’ and the defendants’ cases, Smith and C & C moved *914 for a directed verdict. Both motions were overruled, and the case was submitted to the jury. The jury deadlocked seven to five on the issue of Schmidt’s liability, and since it was unable to reach a verdict, the jury was dismissed. However, before a mistrial was granted, Smith and C & C reasserted their motion for a directed verdict. This motion to reconsider the directed verdict was granted, and a take-nothing judgment was rendered in favor of Smith and C & C. All of the remaining defendants settled their claims with McIntyre, and McIntyre does not challenge the propriety of the directed verdict granted on behalf of C & C; therefore, Smith is the only defendant involved in this appeal.
In their sole point of error, McIntyre asserts that the trial court erred in granting a directed verdict for Smith. In reviewing a directed verdict, we examine the evidence in the light most favorable to the party suffering the adverse judgment and disregard all contrary evidence and inferences.
S.V. v. R.V.,
To prevail in any medical negligence cause of action, the trier of fact must be guided by the opinion testimony of experts.
Hart v. Van Zandt,
(1) a duty by the physician to act according to a certain standard of care;
(2) a breach of that standard of care;
(3) an injury; and
(4) a causal connection between the breach of care and the injury.
McCombs v. Children’s Med. Ctr. of Dallas,
In this case, Smith moved for a directed verdict on two grounds. First, Smith alleged there was no evidence of the standard of care for a nephrologist, and therefore, there could be no evidence of a breach of that standard. Second, Smith claims that McIntyre failed to present any evidence of proximate cause.
It is well established that the threshold question in a medical malpractice case is the standard of care.
Hammonds v. Thomas,
Smith claims that McIntyre failed to establish the applicable standard of care because they failed to elicit this standard from a doctor in the same school of practice, and they failed to show that the practice in question was equally developed in both the field of nephrology and the respective fields of medicine of the other expert witnesses. It is true that none of the expert witnesses were specifically asked if the treatment of this particular patient involved a subject of inquiry common to and equally developed in their respective fields of medical practice and the field of nephrology. However, we do not feel that this question must be explicitly asked and answered in order for an expert in one medical field to be qualified to testify against a practitioner with a different specialization.
See Marling v. Maillard,
Through the expert testimony, it is clear that the placement of central venous catheters, which includes the viewing and interpretation of x-rays, are common to and equally developed in many fields of medicine.
2
Many surgeons and radiologists testified, without objection, that they were familiar with the proper way to place a central venous catheter and that this process involved being able to properly interpret an x-ray. Larry Peebles, M.D., specifically stated, without objection, that many different specialists are routinely involved in the placement of catheters, and among those were general surgeons, those who specialize in internal medicine, ne-phrologists, cardiovascular surgeons, cardiac surgeons, and cardiologists. Roger Youman, Jr., M.D., testified that he has taught many doctors how to properly place a central venous catheter and that part of the catheter placement process includes checking the placement with an x-ray. Schmidt testified that a nephrologist who had been practicing for several years would have placed several Quinton catheters and would know how to use a guide wire in the placement of a catheter. Finally, Smith himself testified that he was trained in how to place catheters, and that he ordered and looked at the chest x-rays in order to determine if the catheter was in the appropriate place. It is clear from the record that the subject at issue is equally developed in many fields of medicine, and thus, those practitioners who perform these medical techniques are qualified to give the standard of care that would apply to Smith’s actions in this case.
See Blan v. Ali,
Since the appropriate standard of care was given, we next must determine if there was adequate evidence of Smith’s negligence, or in other words, whether Smith deviated from this established standard of care. Schmidt testified that pushing a catheter or a dilator in too far or too aggressively would be negligent. Schmidt also testified that if a physician was aware or suspicious of the fact that a patient had *916 a hole in a major vein, he should closely monitor the patient and should not administer a blood thinner such as Heparin. Finally, Schmidt testified that he agreed with another doctor’s deposition testimony that on January 20, 1996, Smith had enough information in front of him to conclude that the catheter was outside the vein. Next, Youman testified that the Quinton catheters inserted by both Schmidt and Smith were not in the proper position, as was evident by all of the x-rays taken. He also testified that since both Schmidt and Smith should have known that the catheters had exited the vein, the patient should not have been put through dialysis or given Heparin until there had been a proper period of stabilization. Then, Dr. Karl Tomm testified that all of the x-rays showed that the catheters had exited the venous system and that an ordinarily prudent physician would not have initiated dialysis or given Heparin until an adequate period of time had passed in order to make sure that the patient was not going to hemorrhage. Next, Dr. Neill Longley testified that by looking at the x-rays a physician could determine that the catheters had exited the venous system.
Finally, Smith himself was called to testify. He stated that he viewed x-rays eight and nine, and that he manipulated and ultimately removed the nonfunctional catheter that was inserted by Schmidt. He also stated that he inserted a second catheter in the same location, and then after being again unable to aspirate blood from this catheter, he ordered another chest x-ray, which he viewed. He stated that since he could not affirmatively determine what was wrong with the catheter, he decided to remove it and insert a third catheter in the patient’s leg. This catheter did work properly, and so Smith then initiated dialysis, waited three to five minutes, spoke with the family, and then left to tend to other patients at a different hospital. He testified that just as he reached the second hospital, he received a call from the dialysis nurse telling him that Virgil’s blood pressure had dropped, and that he was experiencing shortness of breath and chest pains. Smith ordered the nurse to administer additional fluids and to do some blood work, rather than take an additional chest x-ray, which the nurse had suggested. Smith received another telephone call from the nurse when the blood work was available, which showed Virgil’s hematocrit level had decreased, and Smith told her he would return as soon as possible. However, about ten minutes later, while Smith was still at the other hospital, he received a third call telling him that Virgil had gone into cardiac arrest.
Looking at the testimony in the light most favorable to the party suffering the adverse judgment, we find there was sufficient evidence of probative value to raise a material fact issue as to Smith’s deviation from the established standard of care.
See S.V.,
Finally, we must consider whether there was sufficient evidence that Smith’s actions were the proximate cause of Virgil’s injury. Once again, we will consider the evidence in the light most favorable to McIntyre.
See S.V.,
The take-nothing judgment is reversed, and the cause is remanded for a new trial.
Notes
. The physician to whom Virgil was referred by his family physician and who admitted Virgil to the hospital for an emergency appendectomy.
. In Smith’s motion for rehearing, he contends that no standard of care was given which governs his conduct because he adjusted and removed McIntyre’s Quinton catheter, which is a different procedure from placing a Quinton catheter. We believe the testimony given regarding the standard of care for placing a catheter obviously includes the actions that Smith took when he adjusted, removed, and placed another catheter in McIntyre’s chest.
